Jay Foad 86dcb59206 [AMDGPU] Prefer v_fmac over v_fma only when no source modifiers are used ...

v_fmac with source modifiers forces VOP3 encoding, but it is strictly
better to use the VOP3-only v_fma instead, because $dst and $src2 are
not tied so it gives the register allocator more freedom and avoids a
copy in some cases.

This is the same strategy we already use for v_mad vs v_mac and
v_fma_legacy vs v_fmac_legacy.

Differential Revision: https://reviews.llvm.org/D110070

2021-09-21 11:57:45 +01:00

11 KiB

Raw Blame History

View Raw