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...g: if you have %y = add i32 %x, %x %x will have two uses, but it will have zero if %y is deleted. This was the corner case I was worried about. —escha -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150913/5ace6ad5/attachment.html>

LLVM has two similar bits of infrastructure: a simplifyInstructionsInBlock function and a SimplifyInstructions pass, both intended to be lightweight “fix up this code without doing serious optimizations” functions, as far as I can tell. I don’t think either is used in a performance-sensitive place in-tree; the former is mostly called in minor places when doing CFG twiddling, and the latter seems