nir/opt_algebraic: generalize fmax(fadd(a, b), 0.0) to fsat by not requiring fneg
Not a large effect, but it's positive and makes the pattern simpler.
Foz-DB Navi21:
Totals from 1 (0.00% of 79789) affected shaders:
Instrs: 145 -> 138 (-4.83%)
CodeSize: 784 -> 756 (-3.57%)
Latency: 1495 -> 1487 (-0.54%)
InvThroughput: 210 -> 196 (-6.67%)
VALU: 103 -> 96 (-6.80%)
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34125>
1 file changed
