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fix PR9017, a bug where we'd assert when promoting in unreachable 

code.

llvm-svn: 124100
This commit is contained in:
Chris Lattner 2011-01-24 03:29:07 +00:00
parent 23289c385a
commit b4017769ae
2 changed files with 23 additions and 0 deletions
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3
llvm/lib/Transforms/Utils/SSAUpdater.cpp
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@ -469,6 +469,9 @@ run(const SmallVectorImpl<Instruction*> &Insts) const {
LoadInst *ALoad = LiveInLoads[i];
Value *NewVal = SSA.GetValueInMiddleOfBlock(ALoad->getParent());
replaceLoadWithValue(ALoad, NewVal);
// Avoid assertions in unreachable code.
if (NewVal == ALoad) NewVal = UndefValue::get(NewVal->getType());
ALoad->replaceAllUsesWith(NewVal);
ReplacedLoads[ALoad] = NewVal;
}

20
llvm/test/Transforms/ScalarRepl/crash.ll Normal file
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@ -0,0 +1,20 @@
; RUN: opt -scalarrepl %s -disable-output
; RUN: opt -scalarrepl-ssa %s -disable-output
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.0.0"
; PR9017
define void @test1() nounwind readnone ssp {
entry:
%l_72 = alloca i32*, align 8
unreachable
for.cond: ; preds = %for.cond
%tmp1.i = load i32** %l_72, align 8
store i32* %tmp1.i, i32** %l_72, align 8
br label %for.cond
if.end: ; No predecessors!
ret void
}