diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86TargetTransformInfo.cpp')
| -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 f23057083f9..7f1db70d614 100644 --- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp +++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp @@ -1078,6 +1078,13 @@ int X86TTIImpl::getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm, case Instruction::Store: ImmIdx = 0; break; + case Instruction::And: + // We support 64-bit ANDs with immediates with 32-bits of leading zeroes + // by using a 32-bit operation with implicit zero extension. Detect such + // 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; + // Fallthrough case Instruction::Add: case Instruction::Sub: case Instruction::Mul: @@ -1085,7 +1092,6 @@ int X86TTIImpl::getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm, case Instruction::SDiv: case Instruction::URem: case Instruction::SRem: - case Instruction::And: case Instruction::Or: case Instruction::Xor: case Instruction::ICmp: |
