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Don't delete asm's just because their inputs are undefined;

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xor R, R is a common and valid idiom for zeroing a register, for example.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75571 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2009-07-14 00:45:38 +00:00
parent d9ef1a860e
commit 4458ab0d83
2 changed files with 28 additions and 8 deletions
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11
test/Transforms/SimplifyCFG/2009-07-13-no-delete-asm.ll Normal file
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; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | grep xor
; ModuleID = '<stdin>'
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin9.6"
define void @bar() nounwind {
entry:
store i16 undef, i16* null
%asmtmp = call i32 asm sideeffect "xor $0, $0", "=={bx},rm,~{dirflag},~{fpsr},~{flags},~{memory}"(i16 undef) nounwind ; <i32> [#uses=0]
ret void
}