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[FPEnv][X86] Platform-specific builtin constrained FP enablement

Authored by kpn on Jan 28 2020, 11:43 AM.



[FPEnv][X86] Platform-specific builtin constrained FP enablement

When constrained floating point is enabled the X86-specific builtins don't use constrained intrinsics in some cases. Fix that.

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kpn created this revision.Jan 28 2020, 11:43 AM
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craig.topper added inline comments.Jan 28 2020, 5:37 PM

Technically the fmsub/fnmsub/fnmadd assembly requires optimizations to be enabled. If it appears to work without optimizations its only because fast-isel fell back to SelectionDAG and picked up optimizations due to that. Not something that should be relied on.


Is this just referring to the FIXME-CHECK-ASM?

kpn marked 2 inline comments as done.Jan 29 2020, 5:46 AM
kpn added inline comments.

Ok. Well, the eventual goal is to ship a product with optimization turned on. So I think it makes sense for me to give this a spin with optimizations and see what if anything needs to be done. Unless that's overkill I'll start this afternoon.



kpn updated this revision to Diff 241771.Jan 31 2020, 10:48 AM

Address review comments: FMA tests are now run optimized. This changes where the FIXME lines are located.

LGTM to me with that FIXME added.

This revision was not accepted when it landed; it landed in state Needs Review.Feb 6 2020, 11:26 AM
This revision was automatically updated to reflect the committed changes.