diff options
| -rw-r--r-- | lib/Analysis/ValueTracking.cpp | 5 | ||||
| -rw-r--r-- | test/Transforms/InstCombine/2009-07-02-MaskedIntVector.ll | 15 |
2 files changed, 19 insertions, 1 deletions
diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp index 7509e91bdc..07a18fe4de 100644 --- a/lib/Analysis/ValueTracking.cpp +++ b/lib/Analysis/ValueTracking.cpp @@ -249,7 +249,10 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask, } case Instruction::BitCast: { const Type *SrcTy = I->getOperand(0)->getType(); - if (SrcTy->isInteger() || isa<PointerType>(SrcTy)) { + if ((SrcTy->isInteger() || isa<PointerType>(SrcTy)) && + // TODO: For now, not handling conversions like: + // (bitcast i64 %x to <2 x i32>) + !isa<VectorType>(I->getType())) { ComputeMaskedBits(I->getOperand(0), Mask, KnownZero, KnownOne, TD, Depth+1); return; diff --git a/test/Transforms/InstCombine/2009-07-02-MaskedIntVector.ll b/test/Transforms/InstCombine/2009-07-02-MaskedIntVector.ll new file mode 100644 index 0000000000..7505de17a7 --- /dev/null +++ b/test/Transforms/InstCombine/2009-07-02-MaskedIntVector.ll @@ -0,0 +1,15 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis +; PR4495 + +define i32 @test(i64 %test) { +entry: + %0 = bitcast <4 x i32> undef to <16 x i8> ; <<16 x i8>> [#uses=1] + %t12 = shufflevector <16 x i8> %0, <16 x i8> zeroinitializer, <16 x i32> <i32 0, i32 16, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0> ; <<16 x i8>> [#uses=1] + %t11 = bitcast <16 x i8> %t12 to <2 x i64> ; <<2 x i64>> [#uses=1] + %t9 = extractelement <2 x i64> %t11, i32 0 ; <i64> [#uses=1] + %t10 = bitcast i64 %t9 to <2 x i32> ; <<2 x i32>> [#uses=1] + %t7 = bitcast i64 %test to <2 x i32> ; <<2 x i32>> [#uses=1] + %t6 = xor <2 x i32> %t10, %t7 ; <<2 x i32>> [#uses=1] + %t1 = extractelement <2 x i32> %t6, i32 0 ; <i32> [#uses=1] + ret i32 %t1 +} |