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fix PR7311 by avoiding breaking casts when a bitcast from scalar->vector

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is involved.

llvm-svn: 108117
This commit is contained in:
Chris Lattner 2010-07-12 01:19:22 +00:00
parent c6f9c11878
commit 59bffe35a1
2 changed files with 19 additions and 0 deletions
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8
lib/VMCore/Instructions.cpp
View File

@ -2007,6 +2007,14 @@ unsigned CastInst::isEliminableCastPair(
{ 5, 5, 5, 6, 6, 5, 5, 6, 6,11, 5, 1 }, // BitCast -+
};
// If either of the casts are a bitcast from scalar to vector, disallow the
// merging.
if ((firstOp == Instruction::BitCast &&
isa<VectorType>(SrcTy) != isa<VectorType>(MidTy)) ||
(secondOp == Instruction::BitCast &&
isa<VectorType>(MidTy) != isa<VectorType>(DstTy)))
return 0; // Disallowed
int ElimCase = CastResults[firstOp-Instruction::CastOpsBegin]
[secondOp-Instruction::CastOpsBegin];
switch (ElimCase) {

11
test/Transforms/InstCombine/cast.ll
View File

@ -638,3 +638,14 @@ define <4 x i32> @test62(<3 x float> %call4) nounwind {
; CHECK-NEXT: ret
}
; PR7311 - Don't create invalid IR on scalar->vector cast.
define <2 x float> @test63(i64 %tmp8) nounwind {
entry:
%a = bitcast i64 %tmp8 to <2 x i32>
%vcvt.i = uitofp <2 x i32> %a to <2 x float>
ret <2 x float> %vcvt.i
; CHECK: @test63
; CHECK: bitcast
; CHECK: uitofp
}