FreddyYe updated this revision to Diff 531993.
FreddyYe added a comment.

1. Update generic and pentium Features to align with X86.td.
2. Readjust tests in cpus-intel.ll


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D151696/new/

https://reviews.llvm.org/D151696

Files:
  clang/lib/Basic/Targets/X86.cpp
  clang/lib/Basic/Targets/X86.h
  clang/lib/CodeGen/CodeGenModule.cpp
  clang/test/CodeGen/attr-cpuspecific-avx-abi.c
  clang/test/CodeGen/attr-cpuspecific.c
  llvm/include/llvm/TargetParser/X86TargetParser.def
  llvm/include/llvm/TargetParser/X86TargetParser.h
  llvm/lib/Target/X86/X86.td
  llvm/lib/TargetParser/X86TargetParser.cpp
  llvm/test/CodeGen/X86/cpus-intel.ll

Index: llvm/test/CodeGen/X86/cpus-intel.ll
===================================================================
--- llvm/test/CodeGen/X86/cpus-intel.ll
+++ llvm/test/CodeGen/X86/cpus-intel.ll
@@ -5,17 +5,15 @@
 ; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=i486 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=i586 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium-mmx 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium-mmx -mcpu=pentium_mmx 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=i686 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentiumpro 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium2 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium3 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium3m 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium-m 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium4 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium4m 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentiumpro -mcpu=pentium_pro 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium2 -mcpu=pentium_ii 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium3 -mcpu=pentium3m -mcpu=pentium_iii -mcpu=pentium_iii_no_xmm_regs 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium-m -mcpu=pentium_m 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=pentium4 -mcpu=pentium4m -mcpu=pentium_4 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=yonah 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=prescott 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=prescott -mcpu=pentium_4_sse3 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=lakemont 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=raptorlake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=meteorlake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
@@ -25,44 +23,39 @@
 ; RUN: llc < %s -o /dev/null -mtriple=i686-unknown-unknown -mcpu=emeraldrapids 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=nocona 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=core2 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=penryn 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=nehalem 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=corei7 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=westmere 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=sandybridge 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=corei7-avx 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=ivybridge 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=core-avx-i 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=haswell 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=core-avx2 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=broadwell 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=core2 -mcpu=core_2_duo_ssse3 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=penryn -mcpu=core_2_duo_sse4_1 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=nehalem -mcpu=corei7 -mcpu=core_i7_sse4_2 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=westmere -mcpu=core_aes_pclmulqdq -mcpu=core_5th_gen_avx_tsx 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=sandybridge -mcpu=corei7-avx -mcpu=core_2nd_gen_avx 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=ivybridge -mcpu=core-avx-i -mcpu=core_3rd_gen_avx 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=haswell -mcpu=core-avx2 -mcpu=core_4th_gen_avx -mcpu=core_4th_gen_avx_tsx 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=broadwell -mcpu=core_5th_gen_avx 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=skylake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=skylake-avx512 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=skx 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=skylake-avx512 -mcpu=skx -mcpu=skylake_avx512 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=cascadelake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=cooperlake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=cannonlake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=icelake-client 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=icelake-client -mcpu=icelake_client 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=rocketlake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=icelake-server 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=icelake-server -mcpu=icelake_server 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=tigerlake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=sapphirerapids 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=alderlake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=atom 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=bonnell 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=silvermont 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=slm 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=silvermont -mcpu=slm -mcpu=atom_sse4_2 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=goldmont 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=goldmont-plus 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=goldmont-plus -mcpu=goldmont_plus 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=tremont 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
-; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=knl 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=knl -mcpu=mic_avx512 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=knm 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=raptorlake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=meteorlake 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=sierraforest 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=grandridge 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=graniterapids 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=atom_sse4_2_movbe 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 
 define void @foo() {
   ret void
Index: llvm/lib/TargetParser/X86TargetParser.cpp
===================================================================
--- llvm/lib/TargetParser/X86TargetParser.cpp
+++ llvm/lib/TargetParser/X86TargetParser.cpp
@@ -107,6 +107,8 @@
   X86::CPUKind Kind;
   unsigned KeyFeature;
   FeatureBitset Features;
+  char Mangling;
+  bool OnlyForCPUSpecificDispath;
 };
 
 struct FeatureInfo {
@@ -307,148 +309,175 @@
     FeatureSHSTK;
 
 constexpr ProcInfo Processors[] = {
-  // Empty processor. Include X87 and CMPXCHG8 for backwards compatibility.
-  { {""}, CK_None, ~0U, FeatureX87 | FeatureCMPXCHG8B },
+ // Empty processor. Include X87 and CMPXCHG8 for backwards compatibility.
+  { {""}, CK_None, ~0U, FeatureX87 | FeatureCMPXCHG8B, '\0', false },
+  { {"generic"}, CK_None, ~0U, FeatureX87 | FeatureCMPXCHG8B | Feature64BIT, 'A', true },
   // i386-generation processors.
-  { {"i386"}, CK_i386, ~0U, FeatureX87 },
+  { {"i386"}, CK_i386, ~0U, FeatureX87, '\0', false },
   // i486-generation processors.
-  { {"i486"}, CK_i486, ~0U, FeatureX87 },
-  { {"winchip-c6"}, CK_WinChipC6, ~0U, FeaturesPentiumMMX },
-  { {"winchip2"}, CK_WinChip2, ~0U, FeaturesPentiumMMX | Feature3DNOW },
-  { {"c3"}, CK_C3, ~0U, FeaturesPentiumMMX | Feature3DNOW },
+  { {"i486"}, CK_i486, ~0U, FeatureX87, '\0', false },
+  { {"winchip-c6"}, CK_WinChipC6, ~0U, FeaturesPentiumMMX, '\0', false },
+  { {"winchip2"}, CK_WinChip2, ~0U, FeaturesPentiumMMX | Feature3DNOW, '\0', false },
+  { {"c3"}, CK_C3, ~0U, FeaturesPentiumMMX | Feature3DNOW, '\0', false },
   // i586-generation processors, P5 microarchitecture based.
-  { {"i586"}, CK_i586, ~0U, FeatureX87 | FeatureCMPXCHG8B },
-  { {"pentium"}, CK_Pentium, ~0U, FeatureX87 | FeatureCMPXCHG8B },
-  { {"pentium-mmx"}, CK_PentiumMMX, ~0U, FeaturesPentiumMMX },
+  { {"i586"}, CK_i586, ~0U, FeatureX87 | FeatureCMPXCHG8B, '\0', false },
+  { {"pentium"}, CK_Pentium, ~0U, FeatureX87 | FeatureCMPXCHG8B, 'B', false },
+  { {"pentium-mmx"}, CK_PentiumMMX, ~0U, FeaturesPentiumMMX, 'D', false },
+  { {"pentium_mmx"}, CK_PentiumMMX, ~0U, FeaturesPentiumMMX, 'D', true },
   // i686-generation processors, P6 / Pentium M microarchitecture based.
-  { {"pentiumpro"}, CK_PentiumPro, ~0U, FeatureX87 | FeatureCMPXCHG8B },
-  { {"i686"}, CK_i686, ~0U, FeatureX87 | FeatureCMPXCHG8B },
-  { {"pentium2"}, CK_Pentium2, ~0U, FeaturesPentium2 },
-  { {"pentium3"}, CK_Pentium3, ~0U, FeaturesPentium3 },
-  { {"pentium3m"}, CK_Pentium3, ~0U, FeaturesPentium3 },
-  { {"pentium-m"}, CK_PentiumM, ~0U, FeaturesPentium4 },
-  { {"c3-2"}, CK_C3_2, ~0U, FeaturesPentium3 },
-  { {"yonah"}, CK_Yonah, ~0U, FeaturesPrescott },
+  { {"pentiumpro"}, CK_PentiumPro, ~0U, FeatureX87 | FeatureCMPXCHG8B, 'C', false },
+  { {"pentium_pro"}, CK_PentiumPro, ~0U, FeatureX87 | FeatureCMPXCHG8B, 'C', true },
+  { {"i686"}, CK_i686, ~0U, FeatureX87 | FeatureCMPXCHG8B, '\0', false },
+  { {"pentium2"}, CK_Pentium2, ~0U, FeaturesPentium2, 'E', false },
+  { {"pentium_ii"}, CK_Pentium2, ~0U, FeaturesPentium2, 'E', true },
+  { {"pentium3"}, CK_Pentium3, ~0U, FeaturesPentium3, 'H', false },
+  { {"pentium3m"}, CK_Pentium3, ~0U, FeaturesPentium3, 'H', false },
+  { {"pentium_iii"}, CK_Pentium3, ~0U, FeaturesPentium3, 'H', true },
+  { {"pentium_iii_no_xmm_regs"}, CK_Pentium3, ~0U, FeaturesPentium3, 'H', true },
+  { {"pentium-m"}, CK_PentiumM, ~0U, FeaturesPentium4, 'K', false },
+  { {"pentium_m"}, CK_PentiumM, ~0U, FeaturesPentium4, 'K', true },
+  { {"c3-2"}, CK_C3_2, ~0U, FeaturesPentium3, '\0', false },
+  { {"yonah"}, CK_Yonah, ~0U, FeaturesPrescott, 'L', false },
   // Netburst microarchitecture based processors.
-  { {"pentium4"}, CK_Pentium4, ~0U, FeaturesPentium4 },
-  { {"pentium4m"}, CK_Pentium4, ~0U, FeaturesPentium4 },
-  { {"prescott"}, CK_Prescott, ~0U, FeaturesPrescott },
-  { {"nocona"}, CK_Nocona, ~0U, FeaturesNocona },
+  { {"pentium4"}, CK_Pentium4, ~0U, FeaturesPentium4, 'J', false },
+  { {"pentium4m"}, CK_Pentium4, ~0U, FeaturesPentium4, 'J', false },
+  { {"pentium_4"}, CK_Pentium4, ~0U, FeaturesPentium4, 'J', true },
+  { {"pentium_4_sse3"}, CK_Prescott, ~0U, FeaturesPrescott, 'L', true },
+  { {"prescott"}, CK_Prescott, ~0U, FeaturesPrescott, 'L', false },
+  { {"nocona"}, CK_Nocona, ~0U, FeaturesNocona, 'L', false },
   // Core microarchitecture based processors.
-  { {"core2"}, CK_Core2, FEATURE_SSSE3, FeaturesCore2 },
-  { {"penryn"}, CK_Penryn, ~0U, FeaturesPenryn },
+  { {"core2"}, CK_Core2, FEATURE_SSSE3, FeaturesCore2, 'M', false },
+  { {"core_2_duo_ssse3"}, CK_Core2, ~0U, FeaturesCore2, 'N', true },
+  { {"penryn"}, CK_Penryn, ~0U, FeaturesPenryn, 'N', false },
+  { {"core_2_duo_sse4_1"}, CK_Penryn, ~0U, FeaturesPenryn, 'N', true },
   // Atom processors
-  { {"bonnell"}, CK_Bonnell, FEATURE_SSSE3, FeaturesBonnell },
-  { {"atom"}, CK_Bonnell, FEATURE_SSSE3, FeaturesBonnell },
-  { {"silvermont"}, CK_Silvermont, FEATURE_SSE4_2, FeaturesSilvermont },
-  { {"slm"}, CK_Silvermont, FEATURE_SSE4_2, FeaturesSilvermont },
-  { {"goldmont"}, CK_Goldmont, FEATURE_SSE4_2, FeaturesGoldmont },
-  { {"goldmont-plus"}, CK_GoldmontPlus, FEATURE_SSE4_2, FeaturesGoldmontPlus },
-  { {"tremont"}, CK_Tremont, FEATURE_SSE4_2, FeaturesTremont },
+  { {"bonnell"}, CK_Bonnell, FEATURE_SSSE3, FeaturesBonnell, 'a', false },
+  { {"atom"}, CK_Bonnell, FEATURE_SSSE3, FeaturesBonnell, 'O', false },
+  { {"silvermont"}, CK_Silvermont, FEATURE_SSE4_2, FeaturesSilvermont, 'c', false },
+  { {"slm"}, CK_Silvermont, FEATURE_SSE4_2, FeaturesSilvermont, 'c', false },
+  { {"atom_sse4_2"}, CK_Silvermont, FEATURE_SSE4_2, FeaturesSilvermont, 'c', true },
+  { {"atom_sse4_2_movbe"}, CK_Goldmont, FEATURE_SSE4_2, FeaturesGoldmont, 'c', true },
+  { {"goldmont"}, CK_Goldmont, FEATURE_SSE4_2, FeaturesGoldmont, 'i', false },
+  { {"goldmont-plus"}, CK_GoldmontPlus, FEATURE_SSE4_2, FeaturesGoldmontPlus, 'd', false },
+  { {"goldmont_plus"}, CK_GoldmontPlus, FEATURE_SSE4_2, FeaturesGoldmontPlus, 'd', true },
+  { {"tremont"}, CK_Tremont, FEATURE_SSE4_2, FeaturesTremont, 'd', false },
   // Nehalem microarchitecture based processors.
-  { {"nehalem"}, CK_Nehalem, FEATURE_SSE4_2, FeaturesNehalem },
-  { {"corei7"}, CK_Nehalem, FEATURE_SSE4_2, FeaturesNehalem },
+  { {"nehalem"}, CK_Nehalem, FEATURE_SSE4_2, FeaturesNehalem, 'P', false },
+  { {"core_i7_sse4_2"}, CK_Nehalem, FEATURE_SSE4_2, FeaturesNehalem, 'P', true },
+  { {"corei7"}, CK_Nehalem, FEATURE_SSE4_2, FeaturesNehalem, 'P', false },
   // Westmere microarchitecture based processors.
-  { {"westmere"}, CK_Westmere, FEATURE_PCLMUL, FeaturesWestmere },
+  { {"westmere"}, CK_Westmere, FEATURE_PCLMUL, FeaturesWestmere, 'Q', false },
+  { {"core_aes_pclmulqdq"}, CK_Westmere, FEATURE_PCLMUL, FeaturesWestmere, 'Q', true },
   // Sandy Bridge microarchitecture based processors.
-  { {"sandybridge"}, CK_SandyBridge, FEATURE_AVX, FeaturesSandyBridge },
-  { {"corei7-avx"}, CK_SandyBridge, FEATURE_AVX, FeaturesSandyBridge },
+  { {"sandybridge"}, CK_SandyBridge, FEATURE_AVX, FeaturesSandyBridge, 'R', false },
+  { {"core_2nd_gen_avx"}, CK_SandyBridge, FEATURE_AVX, FeaturesSandyBridge, 'R', true },
+  { {"corei7-avx"}, CK_SandyBridge, FEATURE_AVX, FeaturesSandyBridge, 'R', false },
   // Ivy Bridge microarchitecture based processors.
-  { {"ivybridge"}, CK_IvyBridge, FEATURE_AVX, FeaturesIvyBridge },
-  { {"core-avx-i"}, CK_IvyBridge, FEATURE_AVX, FeaturesIvyBridge },
+  { {"ivybridge"}, CK_IvyBridge, FEATURE_AVX, FeaturesIvyBridge, 'S', false },
+  { {"core_3rd_gen_avx"}, CK_IvyBridge, FEATURE_AVX, FeaturesIvyBridge, 'S', true },
+  { {"core-avx-i"}, CK_IvyBridge, FEATURE_AVX, FeaturesIvyBridge, 'S', false },
   // Haswell microarchitecture based processors.
-  { {"haswell"}, CK_Haswell, FEATURE_AVX2, FeaturesHaswell },
-  { {"core-avx2"}, CK_Haswell, FEATURE_AVX2, FeaturesHaswell },
+  { {"haswell"}, CK_Haswell, FEATURE_AVX2, FeaturesHaswell, 'V', false },
+  { {"core-avx2"}, CK_Haswell, FEATURE_AVX2, FeaturesHaswell, 'V', false },
+  { {"core_4th_gen_avx"}, CK_Haswell, FEATURE_AVX2, FeaturesHaswell, 'V', true },
+  { {"core_4th_gen_avx_tsx"}, CK_Haswell, FEATURE_AVX2, FeaturesHaswell, 'V', true },
   // Broadwell microarchitecture based processors.
-  { {"broadwell"}, CK_Broadwell, FEATURE_AVX2, FeaturesBroadwell },
+  { {"broadwell"}, CK_Broadwell, FEATURE_AVX2, FeaturesBroadwell, 'X', false },
+  { {"core_5th_gen_avx"}, CK_Broadwell, FEATURE_AVX2, FeaturesBroadwell, 'X', true },
+  { {"core_5th_gen_avx_tsx"}, CK_Broadwell, FEATURE_AVX2, FeaturesBroadwell, 'X', true },
   // Skylake client microarchitecture based processors.
-  { {"skylake"}, CK_SkylakeClient, FEATURE_AVX2, FeaturesSkylakeClient },
+  { {"skylake"}, CK_SkylakeClient, FEATURE_AVX2, FeaturesSkylakeClient, 'b', false },
   // Skylake server microarchitecture based processors.
-  { {"skylake-avx512"}, CK_SkylakeServer, FEATURE_AVX512F, FeaturesSkylakeServer },
-  { {"skx"}, CK_SkylakeServer, FEATURE_AVX512F, FeaturesSkylakeServer },
+  { {"skylake-avx512"}, CK_SkylakeServer, FEATURE_AVX512F, FeaturesSkylakeServer, 'a', false },
+  { {"skx"}, CK_SkylakeServer, FEATURE_AVX512F, FeaturesSkylakeServer, 'a', false },
+  { {"skylake_avx512"}, CK_SkylakeServer, FEATURE_AVX512F, FeaturesSkylakeServer, 'a', true },
   // Cascadelake Server microarchitecture based processors.
-  { {"cascadelake"}, CK_Cascadelake, FEATURE_AVX512VNNI, FeaturesCascadeLake },
+  { {"cascadelake"}, CK_Cascadelake, FEATURE_AVX512VNNI, FeaturesCascadeLake, 'o', false },
   // Cooperlake Server microarchitecture based processors.
-  { {"cooperlake"}, CK_Cooperlake, FEATURE_AVX512BF16, FeaturesCooperLake },
+  { {"cooperlake"}, CK_Cooperlake, FEATURE_AVX512BF16, FeaturesCooperLake, 'o', false },
   // Cannonlake client microarchitecture based processors.
-  { {"cannonlake"}, CK_Cannonlake, FEATURE_AVX512VBMI, FeaturesCannonlake },
+  { {"cannonlake"}, CK_Cannonlake, FEATURE_AVX512VBMI, FeaturesCannonlake, 'e', false },
   // Icelake client microarchitecture based processors.
-  { {"icelake-client"}, CK_IcelakeClient, FEATURE_AVX512VBMI2, FeaturesICLClient },
+  { {"icelake-client"}, CK_IcelakeClient, FEATURE_AVX512VBMI2, FeaturesICLClient, 'k', false },
+  { {"icelake_client"}, CK_IcelakeClient, FEATURE_AVX512VBMI2, FeaturesICLClient, 'k', true },
   // Rocketlake microarchitecture based processors.
-  { {"rocketlake"}, CK_Rocketlake, FEATURE_AVX512VBMI2, FeaturesRocketlake },
+  { {"rocketlake"}, CK_Rocketlake, FEATURE_AVX512VBMI2, FeaturesRocketlake, 'k', false },
   // Icelake server microarchitecture based processors.
-  { {"icelake-server"}, CK_IcelakeServer, FEATURE_AVX512VBMI2, FeaturesICLServer },
+  { {"icelake-server"}, CK_IcelakeServer, FEATURE_AVX512VBMI2, FeaturesICLServer, 'k', false },
+  { {"icelake_server"}, CK_IcelakeServer, FEATURE_AVX512VBMI2, FeaturesICLServer, 'k', true },
   // Tigerlake microarchitecture based processors.
-  { {"tigerlake"}, CK_Tigerlake, FEATURE_AVX512VP2INTERSECT, FeaturesTigerlake },
+  { {"tigerlake"}, CK_Tigerlake, FEATURE_AVX512VP2INTERSECT, FeaturesTigerlake, 'l', false },
   // Sapphire Rapids microarchitecture based processors.
-  { {"sapphirerapids"}, CK_SapphireRapids, FEATURE_AVX512BF16, FeaturesSapphireRapids },
+  { {"sapphirerapids"}, CK_SapphireRapids, FEATURE_AVX512BF16, FeaturesSapphireRapids, 'n', false },
   // Alderlake microarchitecture based processors.
-  { {"alderlake"}, CK_Alderlake, FEATURE_AVX2, FeaturesAlderlake },
+  { {"alderlake"}, CK_Alderlake, FEATURE_AVX2, FeaturesAlderlake, 'p', false },
   // Raptorlake microarchitecture based processors.
-  { {"raptorlake"}, CK_Raptorlake, FEATURE_AVX2, FeaturesAlderlake },
+  { {"raptorlake"}, CK_Raptorlake, FEATURE_AVX2, FeaturesAlderlake, 'p', false },
   // Meteorlake microarchitecture based processors.
-  { {"meteorlake"}, CK_Meteorlake, FEATURE_AVX2, FeaturesAlderlake },
+  { {"meteorlake"}, CK_Meteorlake, FEATURE_AVX2, FeaturesAlderlake, 'p', false },
   // Sierraforest microarchitecture based processors.
-  { {"sierraforest"}, CK_Sierraforest, FEATURE_AVX2, FeaturesSierraforest },
+  { {"sierraforest"}, CK_Sierraforest, FEATURE_AVX2, FeaturesSierraforest, 'p', false },
   // Grandridge microarchitecture based processors.
-  { {"grandridge"}, CK_Grandridge, FEATURE_AVX2, FeaturesGrandridge },
+  { {"grandridge"}, CK_Grandridge, FEATURE_AVX2, FeaturesGrandridge, 'p', false },
   // Granite Rapids microarchitecture based processors.
-  { {"graniterapids"}, CK_Graniterapids, FEATURE_AVX512BF16, FeaturesGraniteRapids },
+  { {"graniterapids"}, CK_Graniterapids, FEATURE_AVX512BF16, FeaturesGraniteRapids, 'n', false },
   // Emerald Rapids microarchitecture based processors.
-  { {"emeraldrapids"}, CK_Emeraldrapids, FEATURE_AVX512BF16, FeaturesSapphireRapids },
+  { {"emeraldrapids"}, CK_Emeraldrapids, FEATURE_AVX512BF16, FeaturesSapphireRapids, 'n', false },
   // Knights Landing processor.
-  { {"knl"}, CK_KNL, FEATURE_AVX512F, FeaturesKNL },
+  { {"knl"}, CK_KNL, FEATURE_AVX512F, FeaturesKNL, 'Z', false },
+  { {"mic_avx512"}, CK_KNL, FEATURE_AVX512F, FeaturesKNL, 'Z', true },
   // Knights Mill processor.
-  { {"knm"}, CK_KNM, FEATURE_AVX5124FMAPS, FeaturesKNM },
+  { {"knm"}, CK_KNM, FEATURE_AVX5124FMAPS, FeaturesKNM, 'j', false },
   // Lakemont microarchitecture based processors.
-  { {"lakemont"}, CK_Lakemont, ~0U, FeatureCMPXCHG8B },
+  { {"lakemont"}, CK_Lakemont, ~0U, FeatureCMPXCHG8B, '\0', false },
   // K6 architecture processors.
-  { {"k6"}, CK_K6, ~0U, FeaturesK6 },
-  { {"k6-2"}, CK_K6_2, ~0U, FeaturesK6 | Feature3DNOW },
-  { {"k6-3"}, CK_K6_3, ~0U, FeaturesK6 | Feature3DNOW },
+  { {"k6"}, CK_K6, ~0U, FeaturesK6, '\0', false },
+  { {"k6-2"}, CK_K6_2, ~0U, FeaturesK6 | Feature3DNOW, '\0', false },
+  { {"k6-3"}, CK_K6_3, ~0U, FeaturesK6 | Feature3DNOW, '\0', false },
   // K7 architecture processors.
-  { {"athlon"}, CK_Athlon, ~0U, FeaturesAthlon },
-  { {"athlon-tbird"}, CK_Athlon, ~0U, FeaturesAthlon },
-  { {"athlon-xp"}, CK_AthlonXP, ~0U, FeaturesAthlonXP },
-  { {"athlon-mp"}, CK_AthlonXP, ~0U, FeaturesAthlonXP },
-  { {"athlon-4"}, CK_AthlonXP, ~0U, FeaturesAthlonXP },
+  { {"athlon"}, CK_Athlon, ~0U, FeaturesAthlon, '\0', false },
+  { {"athlon-tbird"}, CK_Athlon, ~0U, FeaturesAthlon, '\0', false },
+  { {"athlon-xp"}, CK_AthlonXP, ~0U, FeaturesAthlonXP, '\0', false },
+  { {"athlon-mp"}, CK_AthlonXP, ~0U, FeaturesAthlonXP, '\0', false },
+  { {"athlon-4"}, CK_AthlonXP, ~0U, FeaturesAthlonXP, '\0', false },
   // K8 architecture processors.
-  { {"k8"}, CK_K8, ~0U, FeaturesK8 },
-  { {"athlon64"}, CK_K8, ~0U, FeaturesK8 },
-  { {"athlon-fx"}, CK_K8, ~0U, FeaturesK8 },
-  { {"opteron"}, CK_K8, ~0U, FeaturesK8 },
-  { {"k8-sse3"}, CK_K8SSE3, ~0U, FeaturesK8SSE3 },
-  { {"athlon64-sse3"}, CK_K8SSE3, ~0U, FeaturesK8SSE3 },
-  { {"opteron-sse3"}, CK_K8SSE3, ~0U, FeaturesK8SSE3 },
-  { {"amdfam10"}, CK_AMDFAM10, FEATURE_SSE4_A, FeaturesAMDFAM10 },
-  { {"barcelona"}, CK_AMDFAM10, FEATURE_SSE4_A, FeaturesAMDFAM10 },
+  { {"k8"}, CK_K8, ~0U, FeaturesK8, '\0', false },
+  { {"athlon64"}, CK_K8, ~0U, FeaturesK8, '\0', false },
+  { {"athlon-fx"}, CK_K8, ~0U, FeaturesK8, '\0', false },
+  { {"opteron"}, CK_K8, ~0U, FeaturesK8, '\0', false },
+  { {"k8-sse3"}, CK_K8SSE3, ~0U, FeaturesK8SSE3, '\0', false },
+  { {"athlon64-sse3"}, CK_K8SSE3, ~0U, FeaturesK8SSE3, '\0', false },
+  { {"opteron-sse3"}, CK_K8SSE3, ~0U, FeaturesK8SSE3, '\0', false },
+  { {"amdfam10"}, CK_AMDFAM10, FEATURE_SSE4_A, FeaturesAMDFAM10, '\0', false },
+  { {"barcelona"}, CK_AMDFAM10, FEATURE_SSE4_A, FeaturesAMDFAM10, '\0', false },
   // Bobcat architecture processors.
-  { {"btver1"}, CK_BTVER1, FEATURE_SSE4_A, FeaturesBTVER1 },
-  { {"btver2"}, CK_BTVER2, FEATURE_BMI, FeaturesBTVER2 },
+  { {"btver1"}, CK_BTVER1, FEATURE_SSE4_A, FeaturesBTVER1, '\0', false },
+  { {"btver2"}, CK_BTVER2, FEATURE_BMI, FeaturesBTVER2, '\0', false },
   // Bulldozer architecture processors.
-  { {"bdver1"}, CK_BDVER1, FEATURE_XOP, FeaturesBDVER1 },
-  { {"bdver2"}, CK_BDVER2, FEATURE_FMA, FeaturesBDVER2 },
-  { {"bdver3"}, CK_BDVER3, FEATURE_FMA, FeaturesBDVER3 },
-  { {"bdver4"}, CK_BDVER4, FEATURE_AVX2, FeaturesBDVER4 },
+  { {"bdver1"}, CK_BDVER1, FEATURE_XOP, FeaturesBDVER1, '\0', false },
+  { {"bdver2"}, CK_BDVER2, FEATURE_FMA, FeaturesBDVER2, '\0', false },
+  { {"bdver3"}, CK_BDVER3, FEATURE_FMA, FeaturesBDVER3, '\0', false },
+  { {"bdver4"}, CK_BDVER4, FEATURE_AVX2, FeaturesBDVER4, '\0', false },
   // Zen architecture processors.
-  { {"znver1"}, CK_ZNVER1, FEATURE_AVX2, FeaturesZNVER1 },
-  { {"znver2"}, CK_ZNVER2, FEATURE_AVX2, FeaturesZNVER2 },
-  { {"znver3"}, CK_ZNVER3, FEATURE_AVX2, FeaturesZNVER3 },
-  { {"znver4"}, CK_ZNVER4, FEATURE_AVX512VBMI2, FeaturesZNVER4 },
+  { {"znver1"}, CK_ZNVER1, FEATURE_AVX2, FeaturesZNVER1, '\0', false },
+  { {"znver2"}, CK_ZNVER2, FEATURE_AVX2, FeaturesZNVER2, '\0', false },
+  { {"znver3"}, CK_ZNVER3, FEATURE_AVX2, FeaturesZNVER3, '\0', false },
+  { {"znver4"}, CK_ZNVER4, FEATURE_AVX512VBMI2, FeaturesZNVER4, '\0', false },
   // Generic 64-bit processor.
-  { {"x86-64"}, CK_x86_64, ~0U, FeaturesX86_64 },
-  { {"x86-64-v2"}, CK_x86_64_v2, ~0U, FeaturesX86_64_V2 },
-  { {"x86-64-v3"}, CK_x86_64_v3, ~0U, FeaturesX86_64_V3 },
-  { {"x86-64-v4"}, CK_x86_64_v4, ~0U, FeaturesX86_64_V4 },
+  { {"x86-64"}, CK_x86_64, ~0U, FeaturesX86_64, '\0', false },
+  { {"x86-64-v2"}, CK_x86_64_v2, ~0U, FeaturesX86_64_V2, '\0', false },
+  { {"x86-64-v3"}, CK_x86_64_v3, ~0U, FeaturesX86_64_V3, '\0', false },
+  { {"x86-64-v4"}, CK_x86_64_v4, ~0U, FeaturesX86_64_V4, '\0', false },
   // Geode processors.
-  { {"geode"}, CK_Geode, ~0U, FeaturesGeode },
+  { {"geode"}, CK_Geode, ~0U, FeaturesGeode, '\0', false },
 };
 
 constexpr const char *NoTuneList[] = {"x86-64-v2", "x86-64-v3", "x86-64-v4"};
 
 X86::CPUKind llvm::X86::parseArchX86(StringRef CPU, bool Only64Bit) {
   for (const auto &P : Processors)
-    if (P.Name == CPU && (P.Features[FEATURE_64BIT] || !Only64Bit))
+    if (!P.OnlyForCPUSpecificDispath && P.Name == CPU &&
+        (P.Features[FEATURE_64BIT] || !Only64Bit))
       return P.Kind;
 
   return CK_None;
@@ -463,14 +492,16 @@
 void llvm::X86::fillValidCPUArchList(SmallVectorImpl<StringRef> &Values,
                                      bool Only64Bit) {
   for (const auto &P : Processors)
-    if (!P.Name.empty() && (P.Features[FEATURE_64BIT] || !Only64Bit))
+    if (!P.OnlyForCPUSpecificDispath && !P.Name.empty() &&
+        (P.Features[FEATURE_64BIT] || !Only64Bit))
       Values.emplace_back(P.Name);
 }
 
 void llvm::X86::fillValidTuneCPUList(SmallVectorImpl<StringRef> &Values,
                                      bool Only64Bit) {
   for (const ProcInfo &P : Processors)
-    if (!P.Name.empty() && (P.Features[FEATURE_64BIT] || !Only64Bit) &&
+    if (!P.OnlyForCPUSpecificDispath && !P.Name.empty() &&
+        (P.Features[FEATURE_64BIT] || !Only64Bit) &&
         !llvm::is_contained(NoTuneList, P.Name))
       Values.emplace_back(P.Name);
 }
@@ -630,8 +661,14 @@
 #include "llvm/TargetParser/X86TargetParser.def"
 };
 
+constexpr FeatureInfo FeatureInfos_WithPLUS[X86::CPU_FEATURE_MAX] = {
+#define X86_FEATURE(ENUM, STR) {{"+" STR}, ImpliedFeatures##ENUM},
+#include "llvm/TargetParser/X86TargetParser.def"
+};
+
 void llvm::X86::getFeaturesForCPU(StringRef CPU,
-                                  SmallVectorImpl<StringRef> &EnabledFeatures) {
+                                  SmallVectorImpl<StringRef> &EnabledFeatures,
+                                  bool IfNeedPlus) {
   auto I = llvm::find_if(Processors,
                          [&](const ProcInfo &P) { return P.Name == CPU; });
   assert(I != std::end(Processors) && "Processor not found!");
@@ -644,8 +681,11 @@
 
   // Add the string version of all set bits.
   for (unsigned i = 0; i != CPU_FEATURE_MAX; ++i)
-    if (Bits[i] && !FeatureInfos[i].Name.empty())
-      EnabledFeatures.push_back(FeatureInfos[i].Name);
+    if (Bits[i] && !FeatureInfos[i].Name.empty() &&
+        !FeatureInfos_WithPLUS[i].Name.empty()){
+      EnabledFeatures.push_back(IfNeedPlus ? FeatureInfos_WithPLUS[i].Name
+                                           : FeatureInfos[i].Name);
+    }
 }
 
 // For each feature that is (transitively) implied by this feature, set it.
@@ -703,6 +743,20 @@
       Features[FeatureInfos[i].Name] = Enabled;
 }
 
+char llvm::X86::getCPUDispatchMangling(StringRef CPU) {
+  auto I = llvm::find_if(Processors,
+                         [&](const ProcInfo &P) { return P.Name == CPU; });
+  assert(I != std::end(Processors) && "Processor not found!");
+  assert(I->Mangling != '\0' && "Processor dooesn't support function multiversion!");
+  return I->Mangling;
+}
+
+bool llvm::X86::validateCPUSpecificCPUDispatch(StringRef Name) {
+  auto I = llvm::find_if(Processors,
+                         [&](const ProcInfo &P) { return P.Name == Name; });
+  return I != std::end(Processors);
+}
+
 uint64_t llvm::X86::getCpuSupportsMask(ArrayRef<StringRef> FeatureStrs) {
   // Processor features and mapping to processor feature value.
   uint64_t FeaturesMask = 0;
Index: llvm/lib/Target/X86/X86.td
===================================================================
--- llvm/lib/Target/X86/X86.td
+++ llvm/lib/Target/X86/X86.td
@@ -1467,20 +1467,22 @@
                               [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
 def : Proc<"pentium",         [FeatureX87, FeatureCX8],
                               [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
-def : Proc<"pentium-mmx",     [FeatureX87, FeatureCX8, FeatureMMX],
-                              [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
-
+foreach P = ["pentium-mmx", "pentium_mmx"] in {
+  def : Proc<P, [FeatureX87, FeatureCX8, FeatureMMX],
+                [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
+}
 def : Proc<"i686", [FeatureX87, FeatureCX8, FeatureCMOV],
                    [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
-def : Proc<"pentiumpro", [FeatureX87, FeatureCX8, FeatureCMOV,
-                          FeatureNOPL],
-                         [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
-
-def : Proc<"pentium2", [FeatureX87, FeatureCX8, FeatureMMX, FeatureCMOV,
-                        FeatureFXSR, FeatureNOPL],
-                       [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
-
-foreach P = ["pentium3", "pentium3m"] in {
+foreach P = ["pentiumpro", "pentium_pro"] in {
+  def : Proc<P, [FeatureX87, FeatureCX8, FeatureCMOV, FeatureNOPL],
+                [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
+}
+foreach P = ["pentium2", "pentium_ii"] in {
+  def : Proc<P, [FeatureX87, FeatureCX8, FeatureMMX, FeatureCMOV,
+                          FeatureFXSR, FeatureNOPL],
+                        [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
+}
+foreach P = ["pentium3", "pentium3m", "pentium_iii_no_xmm_regs", "pentium_iii"] in {
   def : Proc<P, [FeatureX87, FeatureCX8, FeatureMMX,
                  FeatureSSE1, FeatureFXSR, FeatureNOPL, FeatureCMOV],
                 [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
@@ -1496,12 +1498,14 @@
 // measure to avoid performance surprises, in case clang's default cpu
 // changes slightly.
 
-def : ProcModel<"pentium-m", GenericPostRAModel,
+foreach P = ["pentium_m", "pentium-m"] in {
+def : ProcModel<P, GenericPostRAModel,
                 [FeatureX87, FeatureCX8, FeatureMMX, FeatureSSE2,
                 FeatureFXSR, FeatureNOPL, FeatureCMOV],
                 [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
+}
 
-foreach P = ["pentium4", "pentium4m"] in {
+foreach P = ["pentium4", "pentium4m", "pentium_4"] in {
   def : ProcModel<P, GenericPostRAModel,
                   [FeatureX87, FeatureCX8, FeatureMMX, FeatureSSE2,
                    FeatureFXSR, FeatureNOPL, FeatureCMOV],
@@ -1519,10 +1523,12 @@
                 [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
 
 // NetBurst.
-def : ProcModel<"prescott", GenericPostRAModel,
-                [FeatureX87, FeatureCX8, FeatureMMX, FeatureSSE3,
-                 FeatureFXSR, FeatureNOPL, FeatureCMOV],
-                [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
+foreach P = ["prescott", "pentium_4_sse3"] in {
+  def : ProcModel<P, GenericPostRAModel,
+                  [FeatureX87, FeatureCX8, FeatureMMX, FeatureSSE3,
+                  FeatureFXSR, FeatureNOPL, FeatureCMOV],
+                  [TuningSlowUAMem16, TuningInsertVZEROUPPER]>;
+}
 def : ProcModel<"nocona", GenericPostRAModel, [
   FeatureX87,
   FeatureCX8,
@@ -1540,7 +1546,8 @@
 ]>;
 
 // Intel Core 2 Solo/Duo.
-def : ProcModel<"core2", SandyBridgeModel, [
+foreach P = ["core2", "core_2_duo_ssse3"] in {
+def : ProcModel<P, SandyBridgeModel, [
   FeatureX87,
   FeatureCX8,
   FeatureCMOV,
@@ -1557,7 +1564,9 @@
   TuningSlowUAMem16,
   TuningInsertVZEROUPPER
 ]>;
-def : ProcModel<"penryn", SandyBridgeModel, [
+}
+foreach P = ["penryn", "core_2_duo_sse4_1"] in {
+def : ProcModel<P, SandyBridgeModel, [
   FeatureX87,
   FeatureCX8,
   FeatureCMOV,
@@ -1574,6 +1583,7 @@
   TuningSlowUAMem16,
   TuningInsertVZEROUPPER
 ]>;
+}
 
 // Atom CPUs.
 foreach P = ["bonnell", "atom"] in {
@@ -1581,15 +1591,19 @@
                   ProcessorFeatures.AtomTuning>;
 }
 
-foreach P = ["silvermont", "slm"] in {
+foreach P = ["silvermont", "slm", "atom_sse4_2"] in {
   def : ProcModel<P, SLMModel, ProcessorFeatures.SLMFeatures,
                   ProcessorFeatures.SLMTuning>;
 }
 
+def : ProcModel<"atom_sse4_2_movbe", SLMModel, ProcessorFeatures.GLMFeatures,
+                ProcessorFeatures.SLMTuning>;
 def : ProcModel<"goldmont", SLMModel, ProcessorFeatures.GLMFeatures,
                 ProcessorFeatures.GLMTuning>;
-def : ProcModel<"goldmont-plus", SLMModel, ProcessorFeatures.GLPFeatures,
-                ProcessorFeatures.GLPTuning>;
+foreach P = ["goldmont_plus", "goldmont-plus"] in {
+  def : ProcModel<P, SLMModel, ProcessorFeatures.GLPFeatures,
+                  ProcessorFeatures.GLPTuning>;
+}
 def : ProcModel<"tremont", SLMModel, ProcessorFeatures.TRMFeatures,
                 ProcessorFeatures.TRMTuning>;
 def : ProcModel<"sierraforest", AlderlakePModel, ProcessorFeatures.SRFFeatures,
@@ -1598,43 +1612,49 @@
                 ProcessorFeatures.TRMTuning>;
 
 // "Arrandale" along with corei3 and corei5
-foreach P = ["nehalem", "corei7"] in {
+foreach P = ["nehalem", "corei7", "core_i7_sse4_2"] in {
   def : ProcModel<P, SandyBridgeModel, ProcessorFeatures.NHMFeatures,
                   ProcessorFeatures.NHMTuning>;
 }
 
 // Westmere is the corei3/i5/i7 path from nehalem to sandybridge
-def : ProcModel<"westmere", SandyBridgeModel, ProcessorFeatures.WSMFeatures,
-                ProcessorFeatures.WSMTuning>;
+foreach P = ["westmere", "core_aes_pclmulqdq"] in {
+  def : ProcModel<P, SandyBridgeModel, ProcessorFeatures.WSMFeatures,
+                  ProcessorFeatures.WSMTuning>;
+}
 
-foreach P = ["sandybridge", "corei7-avx"] in {
+foreach P = ["sandybridge", "corei7-avx", "core_2nd_gen_avx"] in {
   def : ProcModel<P, SandyBridgeModel, ProcessorFeatures.SNBFeatures,
                   ProcessorFeatures.SNBTuning>;
 }
 
-foreach P = ["ivybridge", "core-avx-i"] in {
+foreach P = ["ivybridge", "core-avx-i", "core_3rd_gen_avx"] in {
   def : ProcModel<P, SandyBridgeModel, ProcessorFeatures.IVBFeatures,
                   ProcessorFeatures.IVBTuning>;
 }
 
-foreach P = ["haswell", "core-avx2"] in {
+foreach P = ["haswell", "core-avx2", "core_4th_gen_avx", "core_4th_gen_avx_tsx"] in {
   def : ProcModel<P, HaswellModel, ProcessorFeatures.HSWFeatures,
                   ProcessorFeatures.HSWTuning>;
 }
 
-def : ProcModel<"broadwell", BroadwellModel, ProcessorFeatures.BDWFeatures,
-                ProcessorFeatures.BDWTuning>;
+foreach P = ["broadwell", "core_5th_gen_avx", "core_5th_gen_avx_tsx"] in {
+  def : ProcModel<P, BroadwellModel, ProcessorFeatures.BDWFeatures,
+                  ProcessorFeatures.BDWTuning>;
+}
 
 def : ProcModel<"skylake", SkylakeClientModel, ProcessorFeatures.SKLFeatures,
                 ProcessorFeatures.SKLTuning>;
 
 // FIXME: define KNL scheduler model
-def : ProcModel<"knl", HaswellModel, ProcessorFeatures.KNLFeatures,
-                ProcessorFeatures.KNLTuning>;
+foreach P = ["knl", "mic_avx512"] in {
+  def : ProcModel<P, HaswellModel, ProcessorFeatures.KNLFeatures,
+                  ProcessorFeatures.KNLTuning>;
+}
 def : ProcModel<"knm", HaswellModel, ProcessorFeatures.KNMFeatures,
                 ProcessorFeatures.KNLTuning>;
 
-foreach P = ["skylake-avx512", "skx"] in {
+foreach P = ["skylake-avx512", "skx", "skylake_avx512"] in {
   def : ProcModel<P, SkylakeServerModel, ProcessorFeatures.SKXFeatures,
                   ProcessorFeatures.SKXTuning>;
 }
@@ -1645,12 +1665,16 @@
                 ProcessorFeatures.CPXFeatures, ProcessorFeatures.CPXTuning>;
 def : ProcModel<"cannonlake", SkylakeServerModel,
                 ProcessorFeatures.CNLFeatures, ProcessorFeatures.CNLTuning>;
-def : ProcModel<"icelake-client", IceLakeModel,
+foreach P = ["icelake-client", "icelake_client"] in {
+def : ProcModel<P, IceLakeModel,
                 ProcessorFeatures.ICLFeatures, ProcessorFeatures.ICLTuning>;
+}
 def : ProcModel<"rocketlake", IceLakeModel,
                 ProcessorFeatures.ICLFeatures, ProcessorFeatures.ICLTuning>;
-def : ProcModel<"icelake-server", IceLakeModel,
+foreach P = ["icelake-server", "icelake_server"] in {
+def : ProcModel<P, IceLakeModel,
                 ProcessorFeatures.ICXFeatures, ProcessorFeatures.ICXTuning>;
+}
 def : ProcModel<"tigerlake", IceLakeModel,
                 ProcessorFeatures.TGLFeatures, ProcessorFeatures.TGLTuning>;
 def : ProcModel<"sapphirerapids", SkylakeServerModel,
Index: llvm/include/llvm/TargetParser/X86TargetParser.h
===================================================================
--- llvm/include/llvm/TargetParser/X86TargetParser.h
+++ llvm/include/llvm/TargetParser/X86TargetParser.h
@@ -155,13 +155,17 @@
 ProcessorFeatures getKeyFeature(CPUKind Kind);
 
 /// Fill in the features that \p CPU supports into \p Features.
-void getFeaturesForCPU(StringRef CPU, SmallVectorImpl<StringRef> &Features);
+/// "+" will be append in front of each feature if IfNeedPlus is true.
+void getFeaturesForCPU(StringRef CPU, SmallVectorImpl<StringRef> &Features,
+                       bool IfNeedPlus = false);
 
 /// Set or clear entries in \p Features that are implied to be enabled/disabled
 /// by the provided \p Feature.
 void updateImpliedFeatures(StringRef Feature, bool Enabled,
                            StringMap<bool> &Features);
 
+char getCPUDispatchMangling(StringRef Name);
+bool validateCPUSpecificCPUDispatch(StringRef Name);
 uint64_t getCpuSupportsMask(ArrayRef<StringRef> FeatureStrs);
 unsigned getFeaturePriority(ProcessorFeatures Feat);
 
Index: llvm/include/llvm/TargetParser/X86TargetParser.def
===================================================================
--- llvm/include/llvm/TargetParser/X86TargetParser.def
+++ llvm/include/llvm/TargetParser/X86TargetParser.def
@@ -235,49 +235,3 @@
 X86_FEATURE       (LVI_LOAD_HARDENING,          "lvi-load-hardening")
 #undef X86_FEATURE_COMPAT
 #undef X86_FEATURE
-
-#ifndef CPU_SPECIFIC
-#define CPU_SPECIFIC(NAME, TUNE_NAME, MANGLING, FEATURES)
-#endif
-
-#ifndef CPU_SPECIFIC_ALIAS
-#define CPU_SPECIFIC_ALIAS(NEW_NAME, TUNE_NAME, NAME)
-#endif
-
-CPU_SPECIFIC("generic", "generic", 'A', "")
-CPU_SPECIFIC("pentium", "pentium", 'B', "")
-CPU_SPECIFIC("pentium_pro", "pentiumpro", 'C', "+cmov")
-CPU_SPECIFIC("pentium_mmx", "pentium-mmx", 'D', "+mmx")
-CPU_SPECIFIC("pentium_ii", "pentium2", 'E', "+cmov,+mmx")
-CPU_SPECIFIC("pentium_iii", "pentium3", 'H', "+cmov,+mmx,+sse")
-CPU_SPECIFIC_ALIAS("pentium_iii_no_xmm_regs", "pentium3", "pentium_iii")
-CPU_SPECIFIC("pentium_4", "pentium4", 'J', "+cmov,+mmx,+sse,+sse2")
-CPU_SPECIFIC("pentium_m", "pentium-m", 'K', "+cmov,+mmx,+sse,+sse2")
-CPU_SPECIFIC("pentium_4_sse3", "prescott", 'L', "+cmov,+mmx,+sse,+sse2,+sse3")
-CPU_SPECIFIC("core_2_duo_ssse3", "core2", 'M', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3")
-CPU_SPECIFIC("core_2_duo_sse4_1", "penryn", 'N', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1")
-CPU_SPECIFIC("atom", "atom", 'O', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+movbe")
-CPU_SPECIFIC("atom_sse4_2", "silvermont", 'c', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+popcnt")
-CPU_SPECIFIC("core_i7_sse4_2", "nehalem", 'P', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+popcnt")
-CPU_SPECIFIC("core_aes_pclmulqdq", "westmere", 'Q', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+popcnt")
-CPU_SPECIFIC("atom_sse4_2_movbe", "silvermont", 'd', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt")
-CPU_SPECIFIC("goldmont", "goldmont", 'i', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt")
-CPU_SPECIFIC("sandybridge", "sandybridge", 'R', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+popcnt,+avx")
-CPU_SPECIFIC_ALIAS("core_2nd_gen_avx", "sandybridge", "sandybridge")
-CPU_SPECIFIC("ivybridge", "ivybridge", 'S', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+popcnt,+f16c,+avx")
-CPU_SPECIFIC_ALIAS("core_3rd_gen_avx", "ivybridge", "ivybridge")
-CPU_SPECIFIC("haswell", "haswell", 'V', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt,+f16c,+avx,+fma,+bmi,+lzcnt,+avx2")
-CPU_SPECIFIC_ALIAS("core_4th_gen_avx", "haswell", "haswell")
-CPU_SPECIFIC("core_4th_gen_avx_tsx", "haswell", 'W', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt,+f16c,+avx,+fma,+bmi,+lzcnt,+avx2")
-CPU_SPECIFIC("broadwell", "broadwell", 'X', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt,+f16c,+avx,+fma,+bmi,+lzcnt,+avx2,+adx")
-CPU_SPECIFIC_ALIAS("core_5th_gen_avx", "broadwell", "broadwell")
-CPU_SPECIFIC("core_5th_gen_avx_tsx", "broadwell", 'Y', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt,+f16c,+avx,+fma,+bmi,+lzcnt,+avx2,+adx")
-CPU_SPECIFIC("knl", "knl", 'Z', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt,+f16c,+avx,+fma,+bmi,+lzcnt,+avx2,+avx512f,+adx,+avx512er,+avx512pf,+avx512cd")
-CPU_SPECIFIC_ALIAS("mic_avx512", "knl", "knl")
-CPU_SPECIFIC("skylake", "skylake", 'b', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt,+f16c,+avx,+fma,+bmi,+lzcnt,+avx2,+adx,+mpx")
-CPU_SPECIFIC( "skylake_avx512", "skylake-avx512", 'a', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt,+f16c,+avx,+fma,+bmi,+lzcnt,+avx2,+avx512dq,+avx512f,+adx,+avx512cd,+avx512bw,+avx512vl,+clwb")
-CPU_SPECIFIC("cannonlake", "cannonlake", 'e', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt,+f16c,+avx,+fma,+bmi,+lzcnt,+avx2,+avx512dq,+avx512f,+adx,+avx512ifma,+avx512cd,+avx512bw,+avx512vl,+avx512vbmi")
-CPU_SPECIFIC("knm", "knm", 'j', "+cmov,+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+movbe,+popcnt,+f16c,+avx,+fma,+bmi,+lzcnt,+avx2,+avx512f,+adx,+avx512er,+avx512pf,+avx512cd,+avx5124fmaps,+avx5124vnniw,+avx512vpopcntdq")
-
-#undef CPU_SPECIFIC_ALIAS
-#undef CPU_SPECIFIC
Index: clang/test/CodeGen/attr-cpuspecific.c
===================================================================
--- clang/test/CodeGen/attr-cpuspecific.c
+++ clang/test/CodeGen/attr-cpuspecific.c
@@ -339,9 +339,9 @@
 ATTR(cpu_specific(knl))
 void OrderDispatchUsageSpecific(void) {}
 
-// CHECK: attributes #[[S]] = {{.*}}"target-features"="+avx,+cmov,+crc32,+cx8,+f16c,+mmx,+popcnt,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave"
+// CHECK: attributes #[[S]] = {{.*}}"target-features"="+avx,+crc32,+cx16,+cx8,+f16c,+fsgsbase,+fxsr,+mmx,+pclmul,+popcnt,+rdrnd,+sahf,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave,+xsaveopt"
 // CHECK-SAME: "tune-cpu"="ivybridge"
-// CHECK: attributes #[[K]] = {{.*}}"target-features"="+adx,+avx,+avx2,+avx512cd,+avx512er,+avx512f,+avx512pf,+bmi,+cmov,+crc32,+cx8,+f16c,+fma,+lzcnt,+mmx,+movbe,+popcnt,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave"
+// CHECK: attributes #[[K]] = {{.*}}"target-features"="+adx,+aes,+avx,+avx2,+avx512cd,+avx512er,+avx512f,+avx512pf,+bmi,+bmi2,+crc32,+cx16,+cx8,+f16c,+fma,+fsgsbase,+fxsr,+invpcid,+lzcnt,+mmx,+movbe,+pclmul,+popcnt,+prefetchwt1,+prfchw,+rdrnd,+rdseed,+sahf,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave,+xsaveopt"
 // CHECK-SAME: "tune-cpu"="knl"
-// CHECK: attributes #[[O]] = {{.*}}"target-features"="+cmov,+cx8,+mmx,+movbe,+sse,+sse2,+sse3,+ssse3,+x87"
+// CHECK: attributes #[[O]] = {{.*}}"target-features"="+cx16,+cx8,+fxsr,+mmx,+movbe,+sahf,+sse,+sse2,+sse3,+ssse3,+x87"
 // CHECK-SAME: "tune-cpu"="atom"
Index: clang/test/CodeGen/attr-cpuspecific-avx-abi.c
===================================================================
--- clang/test/CodeGen/attr-cpuspecific-avx-abi.c
+++ clang/test/CodeGen/attr-cpuspecific-avx-abi.c
@@ -24,5 +24,5 @@
 
 // CHECK: attributes #[[A]] = {{.*}}"target-features"="+avx,+crc32,+cx8,+mmx,+popcnt,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave"
 // CHECK-SAME: "tune-cpu"="generic"
-// CHECK: attributes #[[V]] = {{.*}}"target-features"="+avx,+avx2,+bmi,+cmov,+crc32,+cx8,+f16c,+fma,+lzcnt,+mmx,+movbe,+popcnt,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave"
-// CHECK-SAME: "tune-cpu"="haswell"
+// CHECK: attributes #[[V]] = {{.*}}"target-features"="+avx,+avx2,+bmi,+bmi2,+crc32,+cx16,+cx8,+f16c,+fma,+fsgsbase,+fxsr,+invpcid,+lzcnt,+mmx,+movbe,+pclmul,+popcnt,+rdrnd,+sahf,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave,+xsaveopt"
+// CHECK-SAME: "tune-cpu"="core_4th_gen_avx"
Index: clang/lib/CodeGen/CodeGenModule.cpp
===================================================================
--- clang/lib/CodeGen/CodeGenModule.cpp
+++ clang/lib/CodeGen/CodeGenModule.cpp
@@ -2269,8 +2269,7 @@
     if (SD) {
       // Apply the given CPU name as the 'tune-cpu' so that the optimizer can
       // favor this processor.
-      TuneCPU = getTarget().getCPUSpecificTuneName(
-          SD->getCPUName(GD.getMultiVersionIndex())->getName());
+      TuneCPU = SD->getCPUName(GD.getMultiVersionIndex())->getName();
     }
   } else {
     // Otherwise just add the existing target cpu and target features to the
Index: clang/lib/Basic/Targets/X86.h
===================================================================
--- clang/lib/Basic/Targets/X86.h
+++ clang/lib/Basic/Targets/X86.h
@@ -218,8 +218,6 @@
       StringRef Name,
       llvm::SmallVectorImpl<StringRef> &Features) const override;
 
-  StringRef getCPUSpecificTuneName(StringRef Name) const override;
-
   std::optional<unsigned> getCPUCacheLineSize() const override;
 
   bool validateAsmConstraint(const char *&Name,
Index: clang/lib/Basic/Targets/X86.cpp
===================================================================
--- clang/lib/Basic/Targets/X86.cpp
+++ clang/lib/Basic/Targets/X86.cpp
@@ -1159,43 +1159,19 @@
 }
 
 bool X86TargetInfo::validateCPUSpecificCPUDispatch(StringRef Name) const {
-  return llvm::StringSwitch<bool>(Name)
-#define CPU_SPECIFIC(NAME, TUNE_NAME, MANGLING, FEATURES) .Case(NAME, true)
-#define CPU_SPECIFIC_ALIAS(NEW_NAME, TUNE_NAME, NAME) .Case(NEW_NAME, true)
-#include "llvm/TargetParser/X86TargetParser.def"
-      .Default(false);
-}
-
-static StringRef CPUSpecificCPUDispatchNameDealias(StringRef Name) {
-  return llvm::StringSwitch<StringRef>(Name)
-#define CPU_SPECIFIC_ALIAS(NEW_NAME, TUNE_NAME, NAME) .Case(NEW_NAME, NAME)
-#include "llvm/TargetParser/X86TargetParser.def"
-      .Default(Name);
+  return llvm::X86::validateCPUSpecificCPUDispatch(Name);
 }
 
 char X86TargetInfo::CPUSpecificManglingCharacter(StringRef Name) const {
-  return llvm::StringSwitch<char>(CPUSpecificCPUDispatchNameDealias(Name))
-#define CPU_SPECIFIC(NAME, TUNE_NAME, MANGLING, FEATURES) .Case(NAME, MANGLING)
-#include "llvm/TargetParser/X86TargetParser.def"
-      .Default(0);
+  return llvm::X86::getCPUDispatchMangling(Name);
 }
 
 void X86TargetInfo::getCPUSpecificCPUDispatchFeatures(
     StringRef Name, llvm::SmallVectorImpl<StringRef> &Features) const {
-  StringRef WholeList =
-      llvm::StringSwitch<StringRef>(CPUSpecificCPUDispatchNameDealias(Name))
-#define CPU_SPECIFIC(NAME, TUNE_NAME, MANGLING, FEATURES) .Case(NAME, FEATURES)
-#include "llvm/TargetParser/X86TargetParser.def"
-          .Default("");
-  WholeList.split(Features, ',', /*MaxSplit=*/-1, /*KeepEmpty=*/false);
-}
-
-StringRef X86TargetInfo::getCPUSpecificTuneName(StringRef Name) const {
-  return llvm::StringSwitch<StringRef>(Name)
-#define CPU_SPECIFIC(NAME, TUNE_NAME, MANGLING, FEATURES) .Case(NAME, TUNE_NAME)
-#define CPU_SPECIFIC_ALIAS(NEW_NAME, TUNE_NAME, NAME) .Case(NEW_NAME, TUNE_NAME)
-#include "llvm/TargetParser/X86TargetParser.def"
-      .Default("");
+  SmallVector<StringRef, 32> TargetCPUFeatures;
+  llvm::X86::getFeaturesForCPU(Name, TargetCPUFeatures, true);
+  for (auto &F : TargetCPUFeatures)
+    Features.push_back(F);
 }
 
 // We can't use a generic validation scheme for the cpus accepted here
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