spatel added a comment.

In D72675#1823227 <https://reviews.llvm.org/D72675#1823227>, @mcberg2017 wrote:

> We crossed that bridge internally at Apple a while ago, meaning I have some 
> code debt for cleaning up open source for fma formation that uses contract 
> and reassoc differently than we do today, both together and separately, case 
> by case.


Ah, great. I don't have a preference about the order of patches (ie, is it 
better to make this change first or do the backend cleanup first), so whatever 
works better.

But it would be better to have all of the baseline tests in place, so we know 
where we stand currently. So I'd prefer to have the PPC and x86 tests 
pre-committed to master (change test comments as needed to match current/future 
reality).

We could also decouple the clang part of this patch from the backend change 
IIUC. But do we need another change (or at least tests) to show how the driver 
difference translates in the clang front-end to LLVM FMF and/or function 
attributes?



================
Comment at: clang/test/Driver/fast-math.c:183-184
 //
+// -ffp-contract=off must disable the fast-math umbrella, and the 
unsafe-fp-math
+// umbrella.
+// RUN: %clang -### -ffast-math -ffp-contract=off -c %s 2>&1 \
----------------
Do we need another pair of tests for -ffp-contract=on?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D72675/new/

https://reviews.llvm.org/D72675



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