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fd0832ea89
Commit on - This patch fixes the bug described in http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-May/062343.html The fix allocates an extra slot just below the GPRs and stores the base pointer there. This is done only for functions containing llvm.eh.sjlj.setjmp that also need a base pointer. Because code containing llvm.eh.sjlj.setjmp saves all of the callee-save GPRs in the prologue, the offset to the extra slot can be computed before prologue generation runs. Impact at run-time on affected functions is:: - One extra store in the prologue, The store saves the base pointer. - One extra load after a llvm.eh.sjlj.setjmp. The load restores the base pointer. Because the extra slot is just above a gap between frame-pointer-relative and base-pointer-relative chunks of memory, there is no impact on other offset calculations other than ensuring there is room for the extra slot. http://reviews.llvm.org/D6388 Patch by Arch Robison <arch.robison@intel.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223329 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
1.1 KiB
LLVM
38 lines
1.1 KiB
LLVM
; RUN: llc < %s -mtriple=i386-pc-linux -mcpu=corei7 -relocation-model=static | FileCheck --check-prefix=X86 %s
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; RUN: llc < %s -mtriple=x86_64-pc-linux -mcpu=corei7 -relocation-model=static | FileCheck --check-prefix=X64 %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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%Foo = type { [125 x i8] }
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declare i32 @llvm.eh.sjlj.setjmp(i8*) nounwind
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declare void @whatever(i64, %Foo*, i8**, i8*, i8*, i32) #0
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attributes #0 = { nounwind uwtable "no-frame-pointer-elim"="true" }
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define i32 @test1(i64 %n, %Foo* byval nocapture readnone align 8 %f) #0 {
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entry:
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%buf = alloca [5 x i8*], align 16
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%p = alloca i8*, align 8
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%q = alloca i8, align 64
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%r = bitcast [5 x i8*]* %buf to i8*
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%s = alloca i8, i64 %n, align 1
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store i8* %s, i8** %p, align 8
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%t = call i32 @llvm.eh.sjlj.setjmp(i8* %s)
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call void @whatever(i64 %n, %Foo* %f, i8** %p, i8* %q, i8* %s, i32 %t) #1
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ret i32 0
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; X86: movl %esp, %esi
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; X86: movl %esp, -16(%ebp)
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; X86: {{.LBB.*:}}
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; X86: movl -16(%ebp), %esi
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; X86: {{.LBB.*:}}
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; X64: movq %rsp, %rbx
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; X64: movq %rsp, -48(%rbp)
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; X64: {{.LBB.*:}}
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; X64: movq -48(%rbp), %rbx
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; X64: {{.LBB.*:}}
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}
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