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aco/post-ra: assume scc is going to be overwritten by phis at end of blocks

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Cc: mesa-stable
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27855>
(cherry picked from commit bd93e8372d)
This commit is contained in:
Georg Lehmann 2024-02-28 17:34:59 +01:00 • committed by Eric Engestrom
parent 32e278d0af
commit 79fd6ae01b
2 changed files with 7 additions and 1 deletions
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2
.pick_status.json
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@ -984,7 +984,7 @@
"description": "aco/post-ra: assume scc is going to be overwritten by phis at end of blocks",
"nominated": true,
"nomination_type": 0,
"resolution": 0,
"resolution": 1,
"main_sha": null,
"because_sha": null,
"notes": null

6
src/amd/compiler/aco_optimizer_postRA.cpp
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@ -748,6 +748,12 @@ optimize_postRA(Program* program)
for (aco_ptr<Instruction>& instr : block.instructions)
process_instruction(ctx, instr);
/* SCC might get overwritten by copies or swaps from parallelcopies
* inserted by SSA-elimination for linear phis.
*/
if (!block.scc_live_out)
ctx.instr_idx_by_regs[block.index][scc] = overwritten_unknown_instr;
}
/* Cleanup pass