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| author | Michael Ilseman <milseman@apple.com> | 2013-02-26 22:51:07 +0000 |
|---|---|---|
| committer | Michael Ilseman <milseman@apple.com> | 2013-02-26 22:51:07 +0000 |
| commit | a7b93c1e5fd79df31a21afe5519c7f3ca8bce78a (patch) | |
| tree | 35a7d8afa7ef8b99a5e70b92667501e5ce9b75df | |
| parent | fd666e9e3c591ebeb17769bbe3afdac4d55d8d66 (diff) | |
| download | bcm5719-llvm-a7b93c1e5fd79df31a21afe5519c7f3ca8bce78a.tar.gz bcm5719-llvm-a7b93c1e5fd79df31a21afe5519c7f3ca8bce78a.zip | |
Constant fold vector bitcasts of halves similarly to how floats and doubles are folded. Test case included.
llvm-svn: 176131
| -rw-r--r-- | llvm/lib/Analysis/ConstantFolding.cpp | 14 | ||||
| -rw-r--r-- | llvm/test/Transforms/InstCombine/bitcast-vector-fold.ll | 5 |
2 files changed, 13 insertions, 6 deletions
diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp index c99925deb8f..09d7608c51d 100644 --- a/llvm/lib/Analysis/ConstantFolding.cpp +++ b/llvm/lib/Analysis/ConstantFolding.cpp @@ -54,13 +54,12 @@ static Constant *FoldBitCast(Constant *C, Type *DestTy, // Handle a vector->integer cast. if (IntegerType *IT = dyn_cast<IntegerType>(DestTy)) { - ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(C); - if (CDV == 0) + VectorType *VTy = dyn_cast<VectorType>(C->getType()); + if (VTy == 0) return ConstantExpr::getBitCast(C, DestTy); - unsigned NumSrcElts = CDV->getType()->getNumElements(); - - Type *SrcEltTy = CDV->getType()->getElementType(); + unsigned NumSrcElts = VTy->getNumElements(); + Type *SrcEltTy = VTy->getElementType(); // If the vector is a vector of floating point, convert it to vector of int // to simplify things. @@ -70,9 +69,12 @@ static Constant *FoldBitCast(Constant *C, Type *DestTy, VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElts); // Ask IR to do the conversion now that #elts line up. C = ConstantExpr::getBitCast(C, SrcIVTy); - CDV = cast<ConstantDataVector>(C); } + ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(C); + if (CDV == 0) + return ConstantExpr::getBitCast(C, DestTy); + // Now that we know that the input value is a vector of integers, just shift // and insert them into our result. unsigned BitShift = TD.getTypeAllocSizeInBits(SrcEltTy); diff --git a/llvm/test/Transforms/InstCombine/bitcast-vector-fold.ll b/llvm/test/Transforms/InstCombine/bitcast-vector-fold.ll index 8feec229171..8fd7f35b7bb 100644 --- a/llvm/test/Transforms/InstCombine/bitcast-vector-fold.ll +++ b/llvm/test/Transforms/InstCombine/bitcast-vector-fold.ll @@ -31,3 +31,8 @@ define <4 x i32> @test6() { %tmp3 = bitcast <2 x double> <double 0.5, double 1.0> to <4 x i32> ret <4 x i32> %tmp3 } + +define i32 @test7() { + %tmp3 = bitcast <2 x half> <half 0xH1100, half 0xH0011> to i32 + ret i32 %tmp3 +}
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