Magic-Mirror/llvm-capstone
1
0
Fork 0
mirror of https://github.com/capstone-engine/llvm-capstone.git synced 2025-03-02 23:50:19 +00:00
Code Issues Actions 2 Packages Projects Releases Wiki Activity

Recommit r338204 "[X86] Correct the immediate cost for 'add/sub i64 %x, 0x80000000'."

Browse Source 
This checks in a more direct way without triggering a UBSAN error.

llvm-svn: 338273
This commit is contained in:
Craig Topper 2018-07-30 17:29:57 +00:00
parent bbcc8895bb
commit dd0ef801f8
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
llvm/lib/Target/X86/X86TargetTransformInfo.cpp
View File

@ -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 && Imm.getZExtValue() == 0x80000000)
return TTI::TCC_Free;
ImmIdx = 1;
break;
case Instruction::Mul:
case Instruction::UDiv:
case Instruction::SDiv: