Craig Topper 839c8217b9 [LegalizeTypes][RISCV][X86] Legalize FP_ROUND to libcall in SoftPromoteHalfRes_FP_ROUND if the input type is softened. (#119481) ...

Previously we created an FP_TO_FP16 and legalized it in
SoftenFloatOp_FP_ROUND. This caused i16 to be sent to call lowering
instead of f16. This results in the ABI not being followed if f16 is
supposed to be passed in a different register than i16.

Looking at the libgcc binary for the library function it appears the value
is returned in xmm0 so the X86 test was being miscompiled before.

Fixes #107607.

2024-12-10 22:21:49 -08:00

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