[PATCH] D84405: CodeGen: Improve generated IR for __builtin_mul_overflow(uint, uint, int)

[Tom Stellard via Phabricator via cfe-commits]

tstellar added a comment.

In D84405#2170110 <https://reviews.llvm.org/D84405#2170110>, @vsk wrote:

> How were you able to show that the specialized IRGen is equivalent to the generic kind? I tried doing this with direct inspection (https://godbolt.org/z/o5WEn3), but wasn't able to convince myself. In the past I used a test driver to compare the before/after compiler output -- you might find that useful (https://gist.github.com/vedantk/3eb9c88f82e5c32f2e590555b4af5081).


I compared with what gcc was generating and it looked similar (although my x86 assembly knowledge is not great), but I will give your test driver a try, thanks.


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https://reviews.llvm.org/D84405