diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/X86TargetTransformInfo.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp index 1b260d8d45d..0257c42def2 100644 --- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp +++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp @@ -2332,9 +2332,15 @@ int X86TTIImpl::getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm, // immediates here as the normal path expects bit 31 to be sign extended. if (Idx == 1 && Imm.getBitWidth() == 64 && isUInt<32>(Imm.getZExtValue())) return TTI::TCC_Free; - LLVM_FALLTHROUGH; + ImmIdx = 1; + break; case Instruction::Add: case Instruction::Sub: + // For add/sub, we can use the opposite instruction for INT32_MIN. + if (Idx == 1 && Imm.getBitWidth() == 64 && isInt<32>(-Imm.getSExtValue())) + return TTI::TCC_Free; + ImmIdx = 1; + break; case Instruction::Mul: case Instruction::UDiv: case Instruction::SDiv: |
