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0b39b5ea63
The issue is that the current narrowing patterns are not working in a lot
of cases, for example
(('fdot3', ('vec3', a, 0.0, 0.0), b), ('fmul', a, b)),
is missing patterns like this:
32x3 %1 = load_const (0x3f800000, 0x00000000, 0x00000000) = (1.000000, 0.000000, 0.000000)
32x4 %7 = vec4 %6, %2 (0x0), %2 (0x0), %2 (0x0)
32 %19 = fdot3 %1 (1.000000, 0.000000, 0.000000), %7.xyz
or after some later transforms:
32x2 %0 = load_const (0x3f800000, 0x00000000) = (1.000000, 0.000000)
32x2 %6 = vec2 %5, %1 (0x0)
32 %18 = fdot3 %0 (1.000000, 0.000000).xyy, %6.xyy
This patch is heavily based on old branch from Ian Romanick from 2019.
r300 RV530 shader-db:
total instructions in shared programs: 128900 -> 128882 (-0.01%)
instructions in affected programs: 621 -> 603 (-2.90%)
helped: 10
HURT: 1
total cycles in shared programs: 191837 -> 191828 (<.01%)
cycles in affected programs: 799 -> 790 (-1.13%)
helped: 7
HURT: 1
Signed-off-by: Pavel Ondračka <pavel.ondracka@gmail.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39068>
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