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The traditional system compiler (xlc) on AIX uses a 'fat' object format for LTO
by default, embedding the intermediate representation into a special '.ipa'
section in native XCOFF object files. Then at link time depending on command
line options either a native link or an ipa link can be performed. This patch
adds support for embedding the pre-link IR into the module which is then
codegened to a native XCOFF object with the bitcode emebededed in the .info
section. The .info section representation starts with a magic number, followed
by an 8-byte size, an identifier string and a 4-byte unsigned difference,
finally followed by the payload. The magic number and identifier string indcate
to the linker that the embedded metadata is bitcode and it is appropriate for
use in LTO.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D130777
Files:
clang/include/clang/Basic/CodeGenOptions.def
clang/include/clang/Driver/Options.td
clang/lib/CodeGen/BackendUtil.cpp
clang/lib/Driver/Driver.cpp
clang/lib/Driver/ToolChains/Clang.cpp
clang/test/CodeGen/PowerPC/aix-embedded-bitcode.c
clang/test/CodeGen/embed-lto-metadata.c
clang/test/Driver/embedded-lto.c
llvm/include/llvm/Bitcode/EmbedBitcodePass.h
llvm/include/llvm/MC/MCStreamer.h
llvm/include/llvm/MC/MCXCOFFStreamer.h
llvm/lib/Bitcode/Writer/CMakeLists.txt
llvm/lib/Bitcode/Writer/EmbedBitcodePass.cpp
llvm/lib/MC/MCAsmStreamer.cpp
llvm/lib/MC/MCStreamer.cpp
llvm/lib/Passes/PassBuilder.cpp
llvm/lib/Passes/PassRegistry.def
llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
llvm/test/Bitcode/embed-multiple.ll
llvm/test/Bitcode/embed-unsupported-object-format.ll
llvm/test/Bitcode/embed.ll
llvm/test/CodeGen/PowerPC/aix-embeded-bitcode.ll
llvm/test/CodeGen/PowerPC/aix-embeded-module-padding.ll
llvm/test/Transforms/Util/embeded-lto-TLI-mappings.ll
Index: llvm/test/Transforms/Util/embeded-lto-TLI-mappings.ll
===
--- /dev/null
+++ llvm/test/Transforms/Util/embeded-lto-TLI-mappings.ll
@@ -0,0 +1,20 @@
+; RUN: opt -vector-library=MASSV -passes='function(inject-tli-mappings),embed-bitcode' -S < %s | FileCheck %s
+
+target triple = "powerpc-unknown-aix"
+
+; CHECK: @llvm.compiler.used = appending global [3 x ptr] [ptr @__sind2, ptr @__log10f4, ptr @llvm.embedded.module], section "llvm.metadata"
+
+define double @sin_f64(double %in) {
+ %call = tail call double @sin(double %in)
+ ret double %call
+}
+
+declare double @sin(double) #0
+
+define float @call_llvm.log10.f32(float %in) {
+ %call = tail call float @llvm.log10.f32(float %in)
+ ret float %call
+}
+
+declare float @llvm.log10.f32(float) #0
+attributes #0 = { nounwind readnone }
Index: llvm/test/CodeGen/PowerPC/aix-embeded-module-padding.ll
===
--- /dev/null
+++ llvm/test/CodeGen/PowerPC/aix-embeded-module-padding.ll
@@ -0,0 +1,20 @@
+; RUN: llc -mtriple powerpc-ibm-aix-xcoff < %s | \
+; RUN: FileCheck %s
+; RUN: llc -mtriple powerpc64-ibm-aix-xcoff < %s | \
+; RUN: FileCheck %s
+
+target datalayout = "E-m:a-p:32:32-i64:64-n32"
+target triple = "powerpc-ibm-aix7.2.0.0"
+
+@c = local_unnamed_addr global i8 -85, align 1
+@llvm.embedded.module = private constant [1647 x i8] c"BC\C0\DE5\14\00\00\05\00\00\00b\0C0$MY\BEf\9D\FB\B4O\1B\C8$D\012\05\00!\0C\00\00_\01\00\00\0B\02!\00\02\00\00\00\16\00\00\00\07\81#\91A\C8\04I\06\1029\92\01\84\0C%\05\08\19\1E\04\8Bb\80\0CE\02B\92\0BBd\102\148\08\18K\0A22\88Hp\C4!#D\12\87\8C\10A\92\02d\C8\08\B1\14 CF\88 \C9\0122\84\18*(*\901|\B0\\\91 \C3\C8\00\00\00\89 \00\00\0B\00\00\002\22\C8\08 bF\00!+$\98\0C!%$\98\0C\19'\0C\85\A4\90`2d\\ $c\82\80\98#@\08\03\01s\04`\00\00\13,xx\87{(\07y\80\87qh\83t\10\87vh\83pH\07|\B8\037\90\037\80\037\80\83\0DX)\B4A;\E8A8\B4\01<\E8\C1\1C\C8\81\1E\CC\81\1C\B4A:\D8\01\1D\E8\81\1D\D0A\1B\B8\C3\1C\C8\81\D2\03B\84\04\90!#EB\00\8D\10\86}$\A41\16\E27\16'\00\16_\D8!\01\01 \08@\00\00\80\00\00\00\00\04\80\C4\06\81\C2d\01\00\00Y \00\00\00\07\00\00\002\1E\98\0C\19\11L\90\8C\09\C6\04CB\AD\06\D0J\A0\08\CAa\04\00\00\00\B1\18\00\00\9B\00\00\003\08\80\1C\C4\E1\1Cf\14\01=\88C8\84\C3\8CB\80\07yx\07s\98q\0C\E6\00\0F\ED\10\0E\F4\80\0E3\0CB\1E\C2\C1\1D\CE\A1\1Cf0\05=\88C8\84\83\1B\CC\03=\C8C=\8C\03=\CCx\8Ctp\07{\08\07yH\87pp\07zp\03vx\87p
