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-rw-r--r--src/glsl/nir/nir.h1
-rw-r--r--src/glsl/nir/nir_opt_algebraic.py3
2 files changed, 3 insertions, 1 deletions
diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h
index 6448d4a0f40..7be1abb5743 100644
--- a/src/glsl/nir/nir.h
+++ b/src/glsl/nir/nir.h
@@ -1327,6 +1327,7 @@ typedef struct nir_function {
exec_list_get_head(&(func)->overload_list), node)
typedef struct nir_shader_compiler_options {
+ bool lower_ffma;
bool lower_fpow;
bool lower_fsqrt;
/** lowers fneg and ineg to fsub and isub. */
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index 8d5c03b0be7..83a02b6dad6 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -71,7 +71,8 @@ optimizations = [
(('flrp', a, b, 1.0), b),
(('flrp', a, a, b), a),
(('flrp', 0.0, a, b), ('fmul', a, b)),
- (('fadd', ('fmul', a, b), c), ('ffma', a, b, c)),
+ (('ffma', a, b, c), ('fadd', ('fmul', a, b), c), 'options->lower_ffma'),
+ (('fadd', ('fmul', a, b), c), ('ffma', a, b, c), '!options->lower_ffma'),
# Comparison simplifications
(('inot', ('flt', a, b)), ('fge', a, b)),
(('inot', ('fge', a, b)), ('flt', a, b)),