diff options
Diffstat (limited to 'llvm/lib/Target/AArch64/AArch64ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/AArch64/AArch64ISelLowering.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp index 7c78b96448c..7b539417941 100644 --- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp +++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp @@ -1520,6 +1520,11 @@ static SDValue emitComparison(SDValue LHS, SDValue RHS, ISD::CondCode CC, // Can we combine a (CMP op1, (sub 0, op2) into a CMN instruction ? Opcode = AArch64ISD::ADDS; RHS = RHS.getOperand(1); + } else if (isCMN(LHS, CC)) { + // As we are looking for EQ/NE compares, the operands can be commuted ; can + // we combine a (CMP (sub 0, op1), op2) into a CMN instruction ? + Opcode = AArch64ISD::ADDS; + LHS = LHS.getOperand(1); } else if (LHS.getOpcode() == ISD::AND && isNullConstant(RHS) && !isUnsignedIntSetCC(CC)) { // Similarly, (CMP (and X, Y), 0) can be implemented with a TST |
