[PATCH] D61144: [LoopIdiomRecognize] BCmp loop idiom recognition

[Nikita Popov via Phabricator via llvm-commits]

nikic added inline comments.


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Comment at: lib/Transforms/Scalar/LoopIdiomRecognize.cpp:2129
+  // we'd want to compare more bytes than could be represented by size_t, But
+  // allocation functions also take size_t. So how'd you produce such buffer?
+  NBytes = SE->getMulExpr(
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Is this kind reasoning legal on the level of LLVM IR? Especially if no inbounds GEPs are involved, aren't we just dealing in raw memory and there isn't necessary any object with representable size involved?

(Context: Wondering about this in https://reviews.llvm.org/D61934#inline-559489 and your comment seems like a plausible explanation.)


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D61144/new/

https://reviews.llvm.org/D61144