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llvm-project/llvm/test/CodeGen/X86/prefixdata.ll

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Ensure that prefix data is preserved with subsections-via-symbols On MachO platforms that use subsections-via-symbols dead code stripping will drop prefix data. Unfortunately there is no great way to convey the relationship between a function and its prefix data to the linker. We are forced to use a bit of a hack: we give the prefix data it’s own symbol, and mark the actual function entry an .alt_entry. Patch by Moritz Angermann! Differential Revision: https://reviews.llvm.org/D30770 llvm-svn: 297804
2017-03-15 12:18:16 +08:00
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck --check-prefix=MACHO %s
; RUN: llc < %s -mtriple=x86_64-pc-linux | FileCheck --check-prefix=ELF %s
Implement function prefix data as an IR feature. Previous discussion: http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-July/063909.html Differential Revision: http://llvm-reviews.chandlerc.com/D1191 llvm-svn: 190773
2013-09-16 09:08:15 +08:00
@i = linkonce_odr global i32 1
Ensure that prefix data is preserved with subsections-via-symbols On MachO platforms that use subsections-via-symbols dead code stripping will drop prefix data. Unfortunately there is no great way to convey the relationship between a function and its prefix data to the linker. We are forced to use a bit of a hack: we give the prefix data it’s own symbol, and mark the actual function entry an .alt_entry. Patch by Moritz Angermann! Differential Revision: https://reviews.llvm.org/D30770 llvm-svn: 297804
2017-03-15 12:18:16 +08:00
; MACHO: ltmp0:
; MACHO-NEXT: .long 1
; MACHO-NEXT: .alt_entry _f
; MACHO-NEXT: _f:
; ELF: .type f,@function
; ELF-NEXT: .long 1
; ELF-NEXT: # 0x1
; ELF-NEXT: f:
Implement function prefix data as an IR feature. Previous discussion: http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-July/063909.html Differential Revision: http://llvm-reviews.chandlerc.com/D1191 llvm-svn: 190773
2013-09-16 09:08:15 +08:00
define void @f() prefix i32 1 {
ret void
}
Ensure that prefix data is preserved with subsections-via-symbols On MachO platforms that use subsections-via-symbols dead code stripping will drop prefix data. Unfortunately there is no great way to convey the relationship between a function and its prefix data to the linker. We are forced to use a bit of a hack: we give the prefix data it’s own symbol, and mark the actual function entry an .alt_entry. Patch by Moritz Angermann! Differential Revision: https://reviews.llvm.org/D30770 llvm-svn: 297804
2017-03-15 12:18:16 +08:00
; MACHO: ltmp1:
; MACHO-NEXT: .quad _i
; MACHO-NEXT: .alt_entry _g
; MACHO-NEXT: _g:
; ELF: .type g,@function
; ELF-NEXT: .quad i
; ELF-NEXT: g:
Implement function prefix data as an IR feature. Previous discussion: http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-July/063909.html Differential Revision: http://llvm-reviews.chandlerc.com/D1191 llvm-svn: 190773
2013-09-16 09:08:15 +08:00
define void @g() prefix i32* @i {
ret void
}
Ensure that prefix data is preserved with subsections-via-symbols On MachO platforms that use subsections-via-symbols dead code stripping will drop prefix data. Unfortunately there is no great way to convey the relationship between a function and its prefix data to the linker. We are forced to use a bit of a hack: we give the prefix data it’s own symbol, and mark the actual function entry an .alt_entry. Patch by Moritz Angermann! Differential Revision: https://reviews.llvm.org/D30770 llvm-svn: 297804
2017-03-15 12:18:16 +08:00
; MACHO: .subsections_via_symbols