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We already skip emitting ftrunc in nir_lower_int_to_float when there is ffloor, fround or any other integer-making opcode preceding f2i32. However if lower_ffloor is set for driver that doesn't support integers, the lowered x - ffract(x) patterns would not be recognized and extra ftruct would be emitted, doing unnecessary rounding. This optimization only works if there is no non-trivial swizzling used for the fadd, fneg and ffract involved, which seems to be 99% of the cases according to my testing. This is needed to enable nir ffloor lowering on r300 driver without regressions. I'm not sure if this helps anybody else, the only hardware which sets lower_ffloor and converts ints to floats (and can't do trunc) are some old etnaviv cards, so maybe it will help there a bit. Signed-off-by: Pavel Ondračka <pavel.ondracka@gmail.com> Reviewed-by: Emma Anholt <emma@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20208>
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