diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp index 13d57c0934a..10e6297ef1e 100644 --- a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp +++ b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp @@ -73,6 +73,10 @@ int ARMTTIImpl::getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm, // Conversion to BIC is free, and means we can use ~Imm instead. return std::min(getIntImmCost(Imm, Ty), getIntImmCost(~Imm, Ty)); + if (Opcode == Instruction::Add) + // Conversion to SUB is free, and means we can use -Imm instead. + return std::min(getIntImmCost(Imm, Ty), getIntImmCost(-Imm, Ty)); + if (Opcode == Instruction::ICmp && Imm.isNegative() && Ty->getIntegerBitWidth() == 32) { int64_t NegImm = -Imm.getSExtValue(); |
