[PATCH] D125774: [InstCombine] fold float trunc into exact itofp for small constants

[Sanjay Patel via Phabricator via llvm-commits]

spatel added inline comments.


================
Comment at: llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp:1757-1758
 
+  // If all the value is within the value range of 2^DestNumSigBits, then the
+  // value can be accurately represented.
+  KnownBits SrcKnown = llvm::computeKnownBits(Src, IC.getDataLayout());
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This part is mentioned in the TODO right under here (update that...) and independent of any control-flow changes, so you could remove the changes to ValueTracking and just focus on this part.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D125774/new/

https://reviews.llvm.org/D125774