[PATCH] D113817: [X86] Promote f16 STRICT_FROUND to f32 and call libc.

[Phoebe Wang via Phabricator via llvm-commits]

pengfei added inline comments.


================
Comment at: llvm/lib/Target/X86/X86ISelLowering.cpp:22441-22444
 /// ISD::FROUND is defined to round to nearest with ties rounding away from 0.
 /// This mode isn't supported in hardware on X86. But as long as we aren't
 /// compiling with trapping math, we can emulate this with
 /// floor(X + copysign(nextafter(0.5, 0.0), X)).
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What't the concern we can't emulate for `STRICT_FROUND`. I wonder if we have the same problem when promoting.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D113817/new/

https://reviews.llvm.org/D113817