[PATCH] D87528: Enable '#pragma STDC FENV_ACCESS' in frontend cf. D69272 - Work in Progress

[Serge Pavlov via Phabricator via cfe-commits]

sepavloff added a comment.

> @sepavloff Is it OK if I continue work on this item? Not sure about the protocol when continuing someone else's patch.

It is OK for me. There is also an action in Phabricator "Commandeer Revision" to transfer ownership on a revision item.

I don't think however that the implementation in frontend is the main obstacle for enabling the pragma. It is the part of the standard and is user visible, so clang must provide satisfactory support so that users could try this feature in real applications. This support mainly depends on the support of constrained intrinsics in IR and codegen.

One of the probable ways to confirm the support is to build some pretty large project that uses floating point operations extensively, build it with option `-fp-model=strict` and check if it works. A good choice could be SPEC benchmarks. It would provide us with not only evidence of support but also with number how strict operations slow down execution. Maybe other projects may be used for this purpose, but I don't know such.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D87528/new/

https://reviews.llvm.org/D87528