Emit NOT instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19455 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelPattern.cpp b/lib/Target/X86/X86ISelPattern.cpp
index e9531c5..f2edb65 100644
--- a/lib/Target/X86/X86ISelPattern.cpp
+++ b/lib/Target/X86/X86ISelPattern.cpp
@@ -1382,8 +1382,21 @@
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;