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ac/nir: micro-optimize boolean expression

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Ignoring SCC spilling, the old version is probably faster because this
mixes uniform and divergent booleans.

fossil-db (navi21):
Totals from 61167 (45.10% of 135636) affected shaders:
Instrs: 29961899 -> 29932551 (-0.10%)
CodeSize: 157407028 -> 157289636 (-0.07%)
Latency: 139671953 -> 139625186 (-0.03%); split: -0.03%, +0.00%
InvThroughput: 21221097 -> 21220756 (-0.00%)
SClause: 750438 -> 750439 (+0.00%)
Copies: 2672846 -> 2582332 (-3.39%)

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19340>
This commit is contained in:
Rhys Perry
2022-10-18 19:52:15 +01:00
committed by Marge Bot
parent 03a6eb2547
commit 21a319851a
1 changed files with 2 additions and 1 deletions
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src/amd/common/ac_nir_lower_ngg.c
+2 -1
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@@ -993,7 +993,8 @@ compact_vertices_after_culling(nir_builder *b,
nir_pop_if(b, if_gs_accepted);
nir_store_var(b, es_accepted_var, es_survived, 0x1u);
nir_store_var(b, gs_accepted_var, nir_bcsel(b, fully_culled, nir_imm_false(b), nir_has_input_primitive_amd(b)), 0x1u);
nir_store_var(b, gs_accepted_var,
nir_iand(b, nir_inot(b, fully_culled), nir_has_input_primitive_amd(b)), 0x1u);
}
static void