llvm-6502/test/CodeGen/X86/stack-align-memcpy.ll

; RUN: llc < %s -force-align-stack -mtriple i386-apple-darwin -mcpu=i486 | FileCheck %s

%struct.foo = type { [88 x i8] }

; PR15249
; We can't use rep;movsl here because it clobbers the base pointer in %esi.
define void @test1(%struct.foo* nocapture %x, i32 %y) nounwind {
  %dynalloc = alloca i8, i32 %y, align 1
  call void @bar(i8* %dynalloc, %struct.foo* align 4 byval %x)
  ret void

; CHECK-LABEL: test1:
; CHECK: andl $-16, %esp
; CHECK: movl %esp, %esi
; CHECK-NOT: rep;movsl
}

declare void @bar(i8* nocapture, %struct.foo* align 4 byval) nounwind
X86: Disable generation of rep;movsl when %esi is used as a base pointer. 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 2013-02-13 13:40:35 +00:00			`; RUN: llc < %s -force-align-stack -mtriple i386-apple-darwin -mcpu=i486 \| FileCheck %s`

			`%struct.foo = type { [88 x i8] }`

			`; PR15249`
			`; We can't use rep;movsl here because it clobbers the base pointer in %esi.`
			`define void @test1(%struct.foo* nocapture %x, i32 %y) nounwind {`
			`%dynalloc = alloca i8, i32 %y, align 1`
			`call void @bar(i8* %dynalloc, %struct.foo* align 4 byval %x)`
			`ret void`

Convert CodeGen//.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion. This was done with the following sed invocation to catch label lines demarking function boundaries: sed -i '' "s/^;\( \)\([A-Z0-9_]\):\( \)test\([A-Za-z0-9_-]\):\( \)$/;\1\2-LABEL:\3test\4:\5/g" test/CodeGen//*.ll which was written conservatively to avoid false positives rather than false negatives. I scanned through all the changes and everything looks correct. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186258 91177308-0d34-0410-b5e6-96231b3b80d8 2013-07-13 20:38:47 +00:00			`; CHECK-LABEL: test1:`
X86: Disable generation of rep;movsl when %esi is used as a base pointer. 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 2013-02-13 13:40:35 +00:00			`; CHECK: andl $-16, %esp`
			`; CHECK: movl %esp, %esi`
			`; CHECK-NOT: rep;movsl`
			`}`

			`declare void @bar(i8* nocapture, %struct.foo* align 4 byval) nounwind`