diff options
| -rw-r--r-- | lib/Target/X86/X86ISelPattern.cpp | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/lib/Target/X86/X86ISelPattern.cpp b/lib/Target/X86/X86ISelPattern.cpp index e9531c5db9..f2edb651ae 100644 --- a/lib/Target/X86/X86ISelPattern.cpp +++ b/lib/Target/X86/X86ISelPattern.cpp @@ -1382,8 +1382,21 @@ unsigned ISel::SelectExpr(SDOperand N) { case ISD::XOR: if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) { Tmp1 = SelectExpr(N.getOperand(0)); + + if (CN->isAllOnesValue()) { + switch (N.getValueType()) { + default: assert(0 && "Cannot add this type!"); + case MVT::i1: + case MVT::i8: Opc = X86::NOT8r; break; + case MVT::i16: Opc = X86::NOT16r; break; + case MVT::i32: Opc = X86::NOT32r; break; + } + BuildMI(BB, Opc, 1, Result).addReg(Tmp1); + return Result; + } + switch (N.getValueType()) { - default: assert(0 && "Cannot add this type!"); + default: assert(0 && "Cannot xor this type!"); case MVT::i1: case MVT::i8: Opc = X86::XOR8ri; break; case MVT::i16: Opc = X86::XOR16ri; break; |