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tidy up a bit.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125546 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-02-15 01:56:08 +00:00
parent 155ced8092
commit da1d660aa2
1 changed files with 9 additions and 7 deletions
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16
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
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@ -274,10 +274,11 @@ Instruction *InstCombiner::OptAndOp(Instruction *Op,
ConstantInt *CI = ConstantInt::get(AndRHS->getContext(),
AndRHS->getValue() & ShlMask);
if (CI->getValue() == ShlMask) {
// Masking out bits that the shift already masks
if (CI->getValue() == ShlMask)
// Masking out bits that the shift already masks.
return ReplaceInstUsesWith(TheAnd, Op); // No need for the and.
} else if (CI != AndRHS) { // Reducing bits set in and.
if (CI != AndRHS) { // Reducing bits set in and.
TheAnd.setOperand(1, CI);
return &TheAnd;
}
@ -294,10 +295,11 @@ Instruction *InstCombiner::OptAndOp(Instruction *Op,
ConstantInt *CI = ConstantInt::get(Op->getContext(),
AndRHS->getValue() & ShrMask);
if (CI->getValue() == ShrMask) {
// Masking out bits that the shift already masks.
if (CI->getValue() == ShrMask)
// Masking out bits that the shift already masks.
return ReplaceInstUsesWith(TheAnd, Op);
} else if (CI != AndRHS) {
if (CI != AndRHS) {
TheAnd.setOperand(1, CI); // Reduce bits set in and cst.
return &TheAnd;
}
@ -1065,7 +1067,7 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
}
break;
}
if (ConstantInt *Op0CI = dyn_cast<ConstantInt>(Op0I->getOperand(1)))
if (Instruction *Res = OptAndOp(Op0I, Op0CI, AndRHS, I))
return Res;