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authorIan Romanick <[email protected]>2016-10-19 08:53:10 -0700
committerIan Romanick <[email protected]>2016-10-19 14:25:10 -0700
commit4d35683d91e3d61bf14b76d801bf6ae17237e162 (patch)
tree38228799ee9e32e268947ce31bc99cbf7329a0ca
parentbaed5eab82262bf9b76f5e237ecf21605360d0e3 (diff)
nir: Optimize integer division and modulus with 1
The previous power-of-two rules didn't catch idiv (because i965 doesn't set lower_idiv) and imod cases. The udiv and umod cases should have been caught, but I included them for orthogonality. This fixes silly code observed from compute shaders with local_size_[xy] = 1. Signed-off-by: Ian Romanick <[email protected]> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98299 Reviewed-by: Jordan Justen <[email protected]> Reviewed-by: Jason Ekstrand <[email protected]>
-rw-r--r--src/compiler/nir/nir_opt_algebraic.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 2de8050f853..82d92f42932 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -66,6 +66,10 @@ optimizations = [
(('imul', a, '#b@32(is_pos_power_of_two)'), ('ishl', a, ('find_lsb', b))),
(('imul', a, '#b@32(is_neg_power_of_two)'), ('ineg', ('ishl', a, ('find_lsb', ('iabs', b))))),
+ (('udiv', a, 1), a),
+ (('idiv', a, 1), a),
+ (('umod', a, 1), 0),
+ (('imod', a, 1), 0),
(('udiv', a, '#b@32(is_pos_power_of_two)'), ('ushr', a, ('find_lsb', b))),
(('idiv', a, '#b@32(is_pos_power_of_two)'), ('imul', ('isign', a), ('ushr', ('iabs', a), ('find_lsb', b))), 'options->lower_idiv'),
(('idiv', a, '#b@32(is_neg_power_of_two)'), ('ineg', ('imul', ('isign', a), ('ushr', ('iabs', a), ('find_lsb', ('iabs', b))))), 'options->lower_idiv'),