http://llvm.org/bugs/show_bug.cgi?id=19985
Bug ID: 19985
Summary: InstCombiner::SimplifyDemandedBit can modify an
instruction without adding it to the worklist
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
bool InstCombiner::SimplifyDemandedBits(Use &U, APInt DemandedMask,
APInt &KnownZero, APInt &KnownOne,
unsigned Depth) {
Value *NewVal = SimplifyDemandedUseBits(U.get(), DemandedMask,
KnownZero, KnownOne, Depth);
if (!NewVal) return false;
U = NewVal;
return true;
}
The use is modified, but the instructions in not added back to the worklist.
I don't have a testcase where this changes the result. I just noticed an
instruction being modified and not immediately being revisited while looking at
another issuer in a debugger.
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