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nir/liveness: Consider if uses in nir_ssa_defs_interfere

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Fixes: f86902e75d "nir: Add an SSA-based liveness analysis pass"
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3428
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Yevhenii Kharchenko <yevhenii.kharchenko@globallogic.com>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6824>
(cherry picked from commit 0206fb3941)
This commit is contained in:
Jason Ekstrand 2020-09-22 16:56:42 -05:00 • committed by Eric Engestrom
parent 520d023bfb
commit 083b992f9d
2 changed files with 10 additions and 1 deletions
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2
.pick_status.json
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@ -301,7 +301,7 @@
"description": "nir/liveness: Consider if uses in nir_ssa_defs_interfere",
"nominated": true,
"nomination_type": 1,
"resolution": 0,
"resolution": 1,
"master_sha": null,
"because_sha": "f86902e75d989b781be36ced5dc98dfc0cd34b7b"
},

9
src/compiler/nir/nir_liveness.c
View file

@ -250,6 +250,15 @@ search_for_use_after_instr(nir_instr *start, nir_ssa_def *def)
return true;
node = node->next;
}
/* If uses are considered to be in the block immediately preceding the if
* so we need to also check the following if condition, if any.
*/
nir_if *following_if = nir_block_get_following_if(start->block);
if (following_if && following_if->condition.is_ssa &&
following_if->condition.ssa == def)
return true;
return false;
}