[PATCH] D128895: [InstCombine] Make use of low zero bits to determine exact int->fp cast

[Nikita Popov via Phabricator via llvm-commits]

nikic added inline comments.


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Comment at: llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp:1759
   // Try harder to find if the source integer type has less significant bits.
   // For example, compute number of sign bits or compute low bit mask.
   KnownBits SrcKnown = IC.computeKnownBits(Src, 0, &I);
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The "or compute low bit mask" part can probably be dropped now?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128895/new/

https://reviews.llvm.org/D128895