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Commit a80f2041 authored by Craig Topper's avatar Craig Topper
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[ValueTracking] Prevent a call to computeKnownBits if we already know the... 

[ValueTracking] Prevent a call to computeKnownBits if we already know the state of the bit we would calculate. Also reuse a temporary APInt instead of creating a new one.

llvm-svn: 300239
parent dcdb325f
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