7af802994e
Text section prefix is created in CodeGenPrepare, it's file format independent implementation, text section name is written into object file in TargetLoweringObjectFile, it's file format dependent implementation, port code of adding text section prefix to text section name from ELF to COFF. Different with ELF that use '.' as concatenation character, COFF use '$' as concatenation character. That is, concatenation character is variable, so split concatenation character from text section prefix. Text section prefix is existing feature of ELF, it can help to reduce icache and itlb misses, it's also make possible aggregate other compilers e.g. v8 created same prefix sections. Furthermore, the recent feature Machine Function Splitter (basic block level text prefix section) is based on text section prefix. Reviewed By: pengfei, rnk Differential Revision: https://reviews.llvm.org/D92073
27 lines
1.2 KiB
LLVM
27 lines
1.2 KiB
LLVM
; RUN: llc -mtriple x86_64-linux-gnu -function-sections %s -o - | FileCheck %s --check-prefix=ELF
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; RUN: llc -mtriple x86_64-linux-gnu -unique-section-names=0 -function-sections %s -o - | FileCheck %s --check-prefix=ELF-NOUNIQ
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; RUN: llc -mtriple x86_64-windows-msvc -function-sections %s -o - | FileCheck %s --check-prefix=COFF-MSVC
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; RUN: llc -mtriple x86_64-windows-gnu -function-sections %s -o - | FileCheck %s --check-prefix=COFF-GNU
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define void @foo1(i1 zeroext %0) nounwind !section_prefix !0 {
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;; CHECK hot section name
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; ELF: .section .text.hot.foo1,"ax",@progbits
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; ELF-NOUNIQ: .section .text.hot.,"ax",@progbits,unique,1
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; COFF-MSVC: .section .text$hot,"xr",one_only,foo1
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; COFF-GNU: .section .text$hot$foo1,"xr",one_only,foo1
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ret void
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}
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define void @foo2(i1 zeroext %0) nounwind !section_prefix !1 {
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;; CHECK unlikely section name
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; ELF: .section .text.unlikely.foo2,"ax",@progbits
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; ELF-NOUNIQ: .section .text.unlikely.,"ax",@progbits,unique,2
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; COFF-MSVC: .section .text$unlikely,"xr",one_only,foo2
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; COFF-GNU: .section .text$unlikely$foo2,"xr",one_only,foo2
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ret void
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}
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!0 = !{!"function_section_prefix", !"hot"}
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!1 = !{!"function_section_prefix", !"unlikely"}
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