[PATCH] [X86] Fixes for AMD znver5 enablement

[Umesh Kalvakuntla]

From: Umesh Kalvakuntla <umesh.kalvakun...@amd.com>

- cpuid bit for prefetchi is different from Intel 
(https://docs.amd.com/v/u/en-US/24594_3.37)
- Fix cpu family model numbers
---
 gcc/common/config/i386/cpuinfo.h | 11 +++++++++++
 gcc/config/i386/cpuid.h          |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/gcc/common/config/i386/cpuinfo.h b/gcc/common/config/i386/cpuinfo.h
index c93ea07239a..6b45e1b0531 100644
--- a/gcc/common/config/i386/cpuinfo.h
+++ b/gcc/common/config/i386/cpuinfo.h
@@ -313,6 +313,8 @@ get_amd_cpu (struct __processor_model *cpu_model,
     case 0x1a:
       cpu_model->__cpu_type = AMDFAM1AH;
       if (model <= 0x77)
+      if (model <= 0x4f || (model >= 0x60 && model <= 0x77) ||
+         (model >= 0xd0 && model <= 0xd7))
        {
          cpu = "znver5";
          CHECK___builtin_cpu_is ("znver5");
@@ -1102,6 +1104,15 @@ get_available_features (struct __processor_model 
*cpu_model,
        set_feature (FEATURE_WBNOINVD);
     }
 
+  if (ext_level >= 0x80000021)
+    {
+      __cpuid (0x80000021, eax, ebx, ecx, edx);
+      if (eax & bit_AMD_PREFETCHI)
+       {
+         set_feature (FEATURE_PREFETCHI);
+       }
+    }
+
 #undef set_feature
 }
 
diff --git a/gcc/config/i386/cpuid.h b/gcc/config/i386/cpuid.h
index afd4ef06e9f..dac01d887f1 100644
--- a/gcc/config/i386/cpuid.h
+++ b/gcc/config/i386/cpuid.h
@@ -72,6 +72,10 @@
 #define bit_CLZERO     (1 << 0)
 #define bit_WBNOINVD   (1 << 9)
 
+/* Extended Features (%eax == 0x80000021) */
+/* %eax */
+#define bit_AMD_PREFETCHI (1 << 20) 
+
 /* Extended Features Leaf (%eax == 7, %ecx == 0) */
 /* %ebx */
 #define bit_FSGSBASE   (1 << 0)
-- 
2.43.0