[PATCH] D39812: [Driver, CodeGen] pass through and apply -fassociative-math
Sanjay Patel via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Wed Nov 8 13:00:51 PST 2017
spatel added a comment.
In https://reviews.llvm.org/D39812#919699, @wristow wrote:
> Yes, I think we want to match that behavior. But by "light up" 'nsz' and the no-trapping-math attribute, do you mean automatically turn them on when '-fassociative-math' is specified? I'd think it should be the other way around: Suppress the effect of '-fassociative-math' unless both '-fno-signed-zeros' and '-fno-trapping-math' are also specified.
Yes, my reading of the gcc docs was off. The code appears to match your understanding:
So we'll restrict the effect of -fassociative-math based on the presence of the other flags...more spaghetti needed. :)
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