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Do not codegen 'xor bool, true' as 'not reg'. not reg inverts the upper bits

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of the bytereg.  This fixes yacr2, 300.twolf and probably others.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19622 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-17 00:23:16 +00:00
parent 5836082286
commit c98279d371
1 changed files with 7 additions and 4 deletions
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5
lib/Target/X86/X86ISelPattern.cpp
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@ -1585,17 +1585,20 @@ unsigned ISel::SelectExpr(SDOperand N) {
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Op1)) {
if (CN->isAllOnesValue() && Node->getOpcode() == ISD::XOR) {
Opc = 0;
switch (N.getValueType()) {
default: assert(0 && "Cannot add this type!");
case MVT::i1:
case MVT::i1: break; // Not supported, don't invert upper bits!
case MVT::i8: Opc = X86::NOT8r; break;
case MVT::i16: Opc = X86::NOT16r; break;
case MVT::i32: Opc = X86::NOT32r; break;
}
if (Opc) {
Tmp1 = SelectExpr(Op0);
BuildMI(BB, Opc, 1, Result).addReg(Tmp1);
return Result;
}
}
switch (N.getValueType()) {
default: assert(0 && "Cannot xor this type!");