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add some random notes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131862 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-05-22 18:26:48 +00:00
parent cb559c1270
commit 6c9b8d3d41
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
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@ -40,6 +40,11 @@ static Value *simplifyValueKnownNonZero(Value *V, InstCombiner &IC) {
return IC.Builder->CreateShl(One, A);
}
// TODO: Lots more we could do here:
// "1 >> X" could get an "isexact" bit.
// If V is a phi node, we can call this on each of its operands.
// "select cond, X, 0" can simplify to "X".
return 0;
}