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For inline asm:

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- recognize string "{memory}" in the MI generation
- mark as mayload/maystore when there's a memory clobber constraint.

PR14859.

Patch by Krzysztof Parzyszek

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172228 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2013-01-11 18:12:39 +00:00
parent eed4e0193f
commit fffe363493
4 changed files with 39 additions and 4 deletions
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21
test/CodeGen/Generic/inline-asm-mem-clobber.ll Normal file
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@@ -0,0 +1,21 @@
; RUN: llc -O2 < %s | FileCheck %s
@G = common global i32 0, align 4
define i32 @foo(i8* %p) nounwind uwtable {
entry:
%p.addr = alloca i8*, align 8
%rv = alloca i32, align 4
store i8* %p, i8** %p.addr, align 8
store i32 0, i32* @G, align 4
%0 = load i8** %p.addr, align 8
; CHECK: blah
%1 = call i32 asm "blah", "=r,r,~{memory}"(i8* %0) nounwind
; CHECK: @G
store i32 %1, i32* %rv, align 4
%2 = load i32* %rv, align 4
%3 = load i32* @G, align 4
%add = add nsw i32 %2, %3
ret i32 %add
}