This could be done in a separate pass like we do in GLSL IR, but it seems
to me like having the definitions of the transformations in the two
directions next to each other makes a lot of sense.
---
src/glsl/nir/nir_opt_algebraic.py | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/glsl/nir/nir_opt_algebraic.py
b/src/glsl/nir/nir_opt_algebraic.py
index 2414f71..41bfe04 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -107,6 +107,7 @@ optimizations = [
(('fexp', ('flog', a)), a), # e^ln(a) = a
(('flog2', ('fexp2', a)), a), # lg2(2^a) = a
(('flog', ('fexp', a)), a), # ln(e^a) = a
+ (('fpow', a, b), ('fexp2', ('fmul', ('flog2', a), b)),
'options->lower_fpow'), # 2^(lg2(a)*b) = a^b
(('fexp2', ('fmul', ('flog2', a), b)), ('fpow', a, b),
'!options->lower_fpow'), # 2^(lg2(a)*b) = a^b
(('fexp', ('fmul', ('flog', a), b)), ('fpow', a, b),
'!options->lower_fpow'), # e^(ln(a)*b) = a^b
(('fpow', a, 1.0), a),
--
2.1.4
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