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f09e02f01a
This happens when there is both stack realignment and a dynamic alloca in the function. If we overwrite %esi (rep;movsl uses fixed registers) we'll lose the base pointer and the next register spill will write into oblivion. Fixes PR15249 and unbreaks firefox on i386/freebsd. Mozilla uses dynamic allocas and freebsd a 4 byte stack alignment. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175057 91177308-0d34-0410-b5e6-96231b3b80d8
19 lines
552 B
LLVM
19 lines
552 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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; PR15249
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; We can't use rep;movsl here because it clobbers the base pointer in %esi.
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define void @test1(%struct.foo* nocapture %x, i32 %y) nounwind {
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%dynalloc = alloca i8, i32 %y, align 1
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call void @bar(i8* %dynalloc, %struct.foo* align 4 byval %x)
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ret void
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; CHECK: test1:
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; CHECK: andl $-16, %esp
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; CHECK: movl %esp, %esi
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; CHECK-NOT: rep;movsl
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}
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declare void @bar(i8* nocapture, %struct.foo* align 4 byval) nounwind
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