From: Kenneth Graunke <[email protected]>
On BDW:
total instructions in shared programs: 13071119 -> 13070371 (-0.01%)
instructions in affected programs: 83424 -> 82676 (-0.90%)
helped: 505
HURT: 45 (all TCS, all hurt by a single instruction)
total cycles in shared programs: 256601322 -> 256588932 (-0.00%)
cycles in affected programs: 819410 -> 807020 (-1.51%)
helped: 450
HURT: 57
total loops in shared programs: 2950 -> 2942 (-0.27%)
loops in affected programs: 8 -> 0
helped: 7
HURT: 0
v2: Drop unnecessary 'a@bool' annotation (Connor, Eric).
Add a comment explaining the rule (Ian).
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]> [v1]
Reviewed-by: Timothy Arceri <[email protected]>
---
src/compiler/nir/nir_opt_algebraic.py | 2 ++
1 file changed, 2 insertions(+)
diff --git a/src/compiler/nir/nir_opt_algebraic.py
b/src/compiler/nir/nir_opt_algebraic.py
index ff10d70..3b8836e 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -197,6 +197,8 @@ optimizations = [
(('fmul', ('b2f', a), ('b2f', b)), ('b2f', ('iand', a, b))),
(('fsat', ('fadd', ('b2f', a), ('b2f', b))), ('b2f', ('ior', a, b))),
(('iand', 'a@bool', 1.0), ('b2f', a)),
+ # True/False are ~0 and 0 in NIR. b2i of True is 1, and -1 is ~0 (True).
+ (('ineg', ('b2i', a)), 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
--
2.9.3
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