[Mesa-dev] [PATCH 1/6] nir: Convert ineg(b2i(a)) to a if it's a boolean.

[Kenneth Graunke]

On Haswell (GL 3.3):

total instructions in shared programs: 6211678 -> 6211584 (-0.00%)
instructions in affected programs: 18968 -> 18874 (-0.50%)
helped: 62
HURT: 0
LOST:   0
GAINED: 4

On Broadwell (GL 4.4):

total instructions in shared programs: 11638930 -> 11638181 (-0.01%)
instructions in affected programs: 84768 -> 84019 (-0.88%)
helped: 505
HURT: 45

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
 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 0f0896b..1cf614c 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -180,6 +180,7 @@ optimizations = [
    (('fmul', ('b2f', a), ('b2f', b)), ('b2f', ('iand', a, b))),
    (('fsat', ('fadd', ('b2f', a), ('b2f', b))), ('b2f', ('ior', a, b))),
    (('iand', 'a at bool', 1.0), ('b2f', a)),
+   (('ineg', ('b2i', 'a at bool')), a),
    (('flt', ('fneg', ('b2f', a)), 0), a), # Generated by TGSI KILL_IF.
    (('flt', ('fsub', 0.0, ('b2f', a)), 0), a), # Generated by TGSI KILL_IF.
    # Comparison with the same args.  Note that these are not done for
-- 
2.9.0