diff options
| author | Eric Anholt <[email protected]> | 2015-01-28 10:52:53 -0800 |
|---|---|---|
| committer | Eric Anholt <[email protected]> | 2015-02-18 14:47:51 -0800 |
| commit | 42a8ace66e539957b31ea96fe9a2aaacdb90f30e (patch) | |
| tree | 9275b5449af97f958a3f942ea9d4a2176fdfbcfd | |
| parent | cb95a228e81a963d77f50058c7406db0ad3bccac (diff) | |
nir: Add a flag for lowering fneg/ineg.
vc4 cse/algebraic-disabled stats:
total instructions in shared programs: 44911 -> 44732 (-0.40%)
instructions in affected programs: 11371 -> 11192 (-1.57%)
v2: Fix broken iabs(isub(0, a)) transformation.
v3: Rebase to master (no TGSI->NIR present)
Reviewed-by: Kenneth Graunke <[email protected]> (v1)
| -rw-r--r-- | src/glsl/nir/nir.h | 2 | ||||
| -rw-r--r-- | src/glsl/nir/nir_opt_algebraic.py | 10 |
2 files changed, 12 insertions, 0 deletions
diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h index 37e15efa5cf..6448d4a0f40 100644 --- a/src/glsl/nir/nir.h +++ b/src/glsl/nir/nir.h @@ -1329,6 +1329,8 @@ typedef struct nir_function { typedef struct nir_shader_compiler_options { bool lower_fpow; bool lower_fsqrt; + /** lowers fneg and ineg to fsub and isub. */ + bool lower_negate; } nir_shader_compiler_options; typedef struct nir_shader { diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index f93757e0325..8d5c03b0be7 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -141,6 +141,16 @@ optimizations = [ # next round of opt_algebraic, get picked up by one of the above two. (('bcsel', '#a', b, c), ('bcsel', ('ine', 'a', 0), b, c)), + # Subtracts + (('fsub', 0.0, ('fsub', 0.0, a)), a), + (('isub', 0, ('isub', 0, a)), a), + (('fneg', a), ('fsub', 0.0, a), 'options->lower_negate'), + (('ineg', a), ('isub', 0, a), 'options->lower_negate'), + (('fadd', a, ('fsub', 0.0, b)), ('fsub', a, b)), + (('iadd', a, ('isub', 0, b)), ('isub', a, b)), + (('fabs', ('fsub', 0.0, a)), ('fabs', a)), + (('iabs', ('isub', 0, a)), ('iabs', a)), + # This one may not be exact (('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))), ] |