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Reapply r108378, with bugfixes, testcase, and improved comment formatting.

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This now passes LIT, nighty test, and llvm-gcc bootstrap on my machine.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108422 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2010-07-15 15:00:23 +00:00
parent e616690466
commit 96fe621e07
3 changed files with 62 additions and 0 deletions
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19
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
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@@ -472,6 +472,25 @@ Value *InstCombiner::FoldAndOfICmps(ICmpInst *LHS, ICmpInst *RHS) {
Value *NewOr = Builder->CreateOr(Val, Val2);
return Builder->CreateICmp(LHSCC, NewOr, LHSCst);
}
// (icmp ne (A & C1), 0) & (icmp ne (A & C2), 0) -->
// (icmp eq (A & (C1|C2)), (C1|C2))
if (LHSCC == ICmpInst::ICMP_NE && LHSCst->isZero()) {
Instruction *I1 = dyn_cast<Instruction>(Val);
Instruction *I2 = dyn_cast<Instruction>(Val2);
if (I1 && I1->getOpcode() == Instruction::And &&
I2 && I2->getOpcode() == Instruction::And &&
I1->getOperand(0) == I1->getOperand(0)) {
ConstantInt *CI1 = dyn_cast<ConstantInt>(I1->getOperand(1));
ConstantInt *CI2 = dyn_cast<ConstantInt>(I2->getOperand(1));
if (CI1 && !CI1->isZero() && CI2 && !CI2->isZero() &&
CI1->getValue().operator&(CI2->getValue()) == 0) {
Constant *ConstOr = ConstantExpr::getOr(CI1, CI2);
Value *NewAnd = Builder->CreateAnd(I1->getOperand(0), ConstOr);
return Builder->CreateICmp(ICmpInst::ICMP_EQ, NewAnd, ConstOr);
}
}
}
}
// From here on, we only handle: