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[WebAssembly] Avoid `bit_cast` when printing f32 and f64 immediates

Authored by sunfish on Feb 25 2021, 11:17 AM.



Use APInt to convert a 32-bit or 64-bit immediate to an APFloat rather than bit_cast to a float or double to avoid going through host floating-point and potentially changing the bit pattern of NaNs.

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sunfish created this revision.Feb 25 2021, 11:17 AM
sunfish requested review of this revision.Feb 25 2021, 11:17 AM
Herald added a project: Restricted Project. · View Herald TranscriptFeb 25 2021, 11:17 AM
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sbc100 accepted this revision.Feb 26 2021, 7:26 AM
This revision is now accepted and ready to land.Feb 26 2021, 7:26 AM

I can confirm that this patch fixes the failing immediates.ll test on x86 built by gcc 10.