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nir/opt_algebraic: make pattern pushing fmul into bcsel exact

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The only special case here is d == -0.0.

Foz-DB Navi48:
Totals from 3 (0.00% of 82405) affected shaders:
CodeSize: 29140 -> 29188 (+0.16%)
InvThroughput: 2945 -> 2951 (+0.20%)
VALU: 3217 -> 3223 (+0.19%)

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39641>
This commit is contained in:
Georg Lehmann 2026-02-01 17:01:52 +01:00 • committed by Marge Bot
parent a3bc94a3d0
commit 79e4530a9b
1 changed files with 2 additions and 2 deletions
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4
src/compiler/nir/nir_opt_algebraic.py
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@ -532,8 +532,8 @@ optimizations.extend([
(('ffma@64(contract)', a, b, c), ('fadd', ('fmul', a, b), c), 'options->fuse_ffma64'),
(('ffmaz(contract)', a, b, c), ('fadd', ('fmulz', a, b), c), 'options->fuse_ffma32'),
(('~fmul', ('fadd', ('bcsel', a, ('fmul', b, c), 0), '#d'), '#e'),
('bcsel', a, ('fmul', ('fadd', ('fmul', b, c), d), e), ('fmul', d, e))),
(('fmul', ('fadd', ('bcsel', a, ('fmul', b, c), 0), '#d'), '#e'),
('bcsel', a, ('fmul', ('fadd', ('fmul', b, c), d), e), ('fmul', ('fadd', d, 0.0), e))),
(('fdph', a, b), ('fdot4', ('vec4', 'a.x', 'a.y', 'a.z', 1.0), b), 'options->lower_fdph'),