This works by moving the fadd up across the ffma operations, so that it
can eventually can be combined with a fmul. I'm not sure it works in all
cases, but it works in all the common cases.
Example:
matrix * vec4(coord, 1.0)
is compiled as:
fmul, ffma, ffma, fadd
and with this patch:
ffma, ffma, ffma
Signed-off-by: Jonathan Marek <jonat...@marek.ca>
---
src/compiler/nir/nir_opt_algebraic.py | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/compiler/nir/nir_opt_algebraic.py
b/src/compiler/nir/nir_opt_algebraic.py
index 8f4df891b8..82e10731a6 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -133,6 +133,7 @@ optimizations = [
(('~fadd@64', a, ('fmul', c , ('fadd', b, ('fneg', a)))), ('flrp',
a, b, c), '!options->lower_flrp64'),
(('ffma', a, b, c), ('fadd', ('fmul', a, b), c), 'options->lower_ffma'),
(('~fadd', ('fmul', a, b), c), ('ffma', a, b, c), 'options->fuse_ffma'),
+ (('~fadd', ('ffma', a, b, c), d), ('ffma', a, b, ('fadd', c, d))),
(('fdot4', ('vec4', a, b, c, 1.0), d), ('fdph', ('vec3', a, b, c), d)),
(('fdot4', ('vec4', a, 0.0, 0.0, 0.0), b), ('fmul', a, b)),
--
2.17.1
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