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2f471c83a0
selection dag (PR19012) In X86SelectionDagInfo::EmitTargetCodeForMemcpy we check with MachineFrameInfo to make sure that ESI isn't used as a base pointer register before we choose to emit rep movs (which clobbers esi). The problem is that MachineFrameInfo wouldn't know about dynamic allocas or inline asm that clobbers the stack pointer until SelectionDAGBuilder has encountered them. This patch fixes the problem by checking for such things when building the FunctionLoweringInfo. Differential Revision: http://llvm-reviews.chandlerc.com/D2954 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202930 91177308-0d34-0410-b5e6-96231b3b80d8
18 lines
601 B
LLVM
18 lines
601 B
LLVM
; RUN: llc < %s -force-align-stack -mtriple i386-apple-darwin -mcpu=i486 | FileCheck %s
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%struct.foo = type { [88 x i8] }
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declare void @bar(i8* nocapture, %struct.foo* align 4 byval) nounwind
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; PR19012
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; Don't clobber %esi if we have inline asm that clobbers %esp.
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define void @test1(%struct.foo* nocapture %x, i32 %y, i8* %z) nounwind {
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call void @bar(i8* %z, %struct.foo* align 4 byval %x)
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call void asm sideeffect inteldialect "xor esp, esp", "=*m,~{flags},~{esp},~{esp},~{dirflag},~{fpsr},~{flags}"(i8* %z)
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ret void
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; CHECK-LABEL: test1:
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; CHECK: movl %esp, %esi
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; CHECK-NOT: rep;movsl
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}
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