forked from OSchip/llvm-project
While testing dragonegg I noticed that isCastable and getCastOpcode
had gotten out of sync: isCastable didn't think it was possible to cast the x86_mmx type to anything, while it did think it possible to cast an i64 to x86_mmx. llvm-svn: 128705
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@ -2297,8 +2297,12 @@ bool CastInst::isCastable(const Type *SrcTy, const Type *DestTy) {
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if (const VectorType *SrcPTy = dyn_cast<VectorType>(SrcTy)) {
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// Casting from vector
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return DestPTy->getBitWidth() == SrcPTy->getBitWidth();
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} else { // Casting from something else
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return DestPTy->getBitWidth() == SrcBits;
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} else if (DestPTy->getBitWidth() == SrcBits) {
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return true; // float/int -> vector
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} else if (SrcTy->isX86_MMXTy()) {
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return DestPTy->getBitWidth() == 64; // MMX to 64-bit vector
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} else {
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return false;
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}
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} else if (DestTy->isPointerTy()) { // Casting to pointer
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if (SrcTy->isPointerTy()) { // Casting from pointer
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@ -2308,8 +2312,12 @@ bool CastInst::isCastable(const Type *SrcTy, const Type *DestTy) {
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} else { // Casting from something else
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return false;
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}
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} else if (DestTy->isX86_MMXTy()) {
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return SrcBits == 64;
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} else if (DestTy->isX86_MMXTy()) {
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if (const VectorType *SrcPTy = dyn_cast<VectorType>(SrcTy)) {
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return SrcPTy->getBitWidth() == 64; // 64-bit vector to MMX
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} else {
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return false;
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}
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} else { // Casting to something else
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return false;
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}
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@ -107,5 +107,18 @@ TEST(InstructionsTest, BranchInst) {
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delete bb1;
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}
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TEST(InstructionsTest, CastInst) {
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LLVMContext &C(getGlobalContext());
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const Type* Int8Ty = Type::getInt8Ty(C);
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const Type* Int64Ty = Type::getInt64Ty(C);
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const Type* V8x8Ty = VectorType::get(Int8Ty, 8);
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const Type* X86MMXTy = Type::getX86_MMXTy(C);
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EXPECT_TRUE(CastInst::isCastable(V8x8Ty, X86MMXTy));
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EXPECT_TRUE(CastInst::isCastable(X86MMXTy, V8x8Ty));
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EXPECT_FALSE(CastInst::isCastable(Int64Ty, X86MMXTy));
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}
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} // end anonymous namespace
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} // end namespace llvm
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