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Revert "[X86] Correct the immediate cost for 'add/sub i64 %x, 0x80000000'." 

This reverts commit r338204.

llvm-svn: 338236
This commit is contained in:
Dean Michael Berris 2018-07-30 09:45:09 +00:00
parent 7f0d05d532
commit 927b3da6c9
1 changed files with 1 additions and 7 deletions
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8
llvm/lib/Target/X86/X86TargetTransformInfo.cpp
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@ -2332,15 +2332,9 @@ int X86TTIImpl::getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm,
// immediates here as the normal path expects bit 31 to be sign extended. // immediates here as the normal path expects bit 31 to be sign extended.
if (Idx == 1 && Imm.getBitWidth() == 64 && isUInt<32>(Imm.getZExtValue())) if (Idx == 1 && Imm.getBitWidth() == 64 && isUInt<32>(Imm.getZExtValue()))
return TTI::TCC_Free; return TTI::TCC_Free;
ImmIdx = 1; LLVM_FALLTHROUGH;
break;
case Instruction::Add: case Instruction::Add:
case Instruction::Sub: 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::Mul:
case Instruction::UDiv: case Instruction::UDiv:
case Instruction::SDiv: case Instruction::SDiv: