diff options
Diffstat (limited to 'llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp')
| -rw-r--r-- | llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp index fdb998e9c45..362d2d3c79d 100644 --- a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp +++ b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp @@ -908,6 +908,10 @@ isFoldableLoad(const LoadInst *Ld, const Instruction *&FoldedValue) { UserI->getOpcode() == Instruction::UDiv) && UserI->getOperand(1) != FoldedValue) return false; // Not commutative, only RHS foldable. + // LoadOrTruncBits holds the number of effectively loaded bits, but 0 if an + // extension was made of the load. + unsigned LoadOrTruncBits = + ((SExtBits || ZExtBits) ? 0 : (TruncBits ? TruncBits : LoadedBits)); switch (UserI->getOpcode()) { case Instruction::Add: // SE: 16->32, 16/32->64, z14:16->64. ZE: 32->64 case Instruction::Sub: @@ -919,6 +923,8 @@ isFoldableLoad(const LoadInst *Ld, const Instruction *&FoldedValue) { (SExtBits == 32 || (SExtBits == 64 && ST->hasMiscellaneousExtensions2()))) return true; + if (LoadOrTruncBits == 16) + return true; LLVM_FALLTHROUGH; case Instruction::SDiv:// SE: 32->64 if (LoadedBits == 32 && SExtBits == 64) @@ -938,16 +944,12 @@ isFoldableLoad(const LoadInst *Ld, const Instruction *&FoldedValue) { // case Instruction::FDiv: // All possible extensions of memory checked above. - if (SExtBits || ZExtBits) - return false; // Comparison between memory and immediate. if (UserI->getOpcode() == Instruction::ICmp) if (ConstantInt *CI = dyn_cast<ConstantInt>(UserI->getOperand(1))) if (isUInt<16>(CI->getZExtValue())) return true; - - unsigned LoadOrTruncBits = (TruncBits ? TruncBits : LoadedBits); return (LoadOrTruncBits == 32 || LoadOrTruncBits == 64); break; } |
