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Fix a bug in my patch last night that broke InstCombine/2007-10-12-Crash.ll 

llvm-svn: 42920
This commit is contained in:
Chris Lattner 2007-10-12 18:05:47 +00:00
parent a1a4a9ebfa
commit ad618f66e6
2 changed files with 45 additions and 1 deletions
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8
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -8643,8 +8643,14 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// converted to match the type of the cast, don't touch this.
if (isa<AllocationInst>(BCI->getOperand(0))) {
// See if the bitcast simplifies, if so, don't nuke this GEP yet.
if (visitBitCast(*BCI))
if (Instruction *I = visitBitCast(*BCI)) {
if (I != BCI) {
I->takeName(BCI);
BCI->getParent()->getInstList().insert(BCI, I);
ReplaceInstUsesWith(*BCI, I);
}
return &GEP;
}
}
return new BitCastInst(BCI->getOperand(0), GEP.getType());
}

38
llvm/test/Transforms/InstCombine/2007-10-12-Crash.ll Normal file
View File

@ -0,0 +1,38 @@
; RUN: llvm-as < %s | opt -instcombine -disable-output
%struct.Ray = type { %struct.Vec, %struct.Vec }
%struct.Scene = type { i32 (...)** }
%struct.Vec = type { double, double, double }
declare double @_Z9ray_traceRK3VecRK3RayRK5Scene(%struct.Vec*, %struct.Ray*, %struct.Scene*)
define i32 @main(i32 %argc, i8** %argv) {
entry:
%tmp3 = alloca %struct.Ray, align 4 ; <%struct.Ray*> [#uses=2]
%tmp97 = icmp slt i32 0, 512 ; <i1> [#uses=1]
br i1 %tmp97, label %bb71, label %bb108
bb29: ; preds = %bb62
%tmp322 = bitcast %struct.Ray* %tmp3 to %struct.Vec* ; <%struct.Vec*> [#uses=1]
%tmp322.0 = getelementptr %struct.Vec* %tmp322, i32 0, i32 0 ; <double*> [#uses=1]
store double 0.000000e+00, double* %tmp322.0
%tmp57 = call double @_Z9ray_traceRK3VecRK3RayRK5Scene( %struct.Vec* null, %struct.Ray* %tmp3, %struct.Scene* null ) ; <double> [#uses=0]
br label %bb62
bb62: ; preds = %bb71, %bb29
%tmp65 = icmp slt i32 0, 4 ; <i1> [#uses=1]
br i1 %tmp65, label %bb29, label %bb68
bb68: ; preds = %bb62
ret i32 0
bb71: ; preds = %entry
%tmp74 = icmp slt i32 0, 4 ; <i1> [#uses=1]
br i1 %tmp74, label %bb62, label %bb77
bb77: ; preds = %bb71
ret i32 0
bb108: ; preds = %entry
ret i32 0
}