diff options
| author | Alyssa Rosenzweig <[email protected]> | 2019-08-05 10:53:41 -0700 |
|---|---|---|
| committer | Alyssa Rosenzweig <[email protected]> | 2019-08-05 10:58:39 -0700 |
| commit | 28697583557e37e3dec95aa043411594e3c25623 (patch) | |
| tree | 395843f95019ff1c28463420f8ba267a6bedb479 /src | |
| parent | 04a995158084acbd1917b4c7e0f8d381e1c9222d (diff) | |
pan/midgard: Rewrite bidirectionally when eliminating moves
Symptom: the sky is black in SuperTuxKart (flashbacks to SMB/NES
emulation intensify).
Essentially, what happened is a fixed (special) move to r0 was
eliminated but scheduling did not factor this in, so
can_run_concurrent_ssa returned true even when there was a logical data
dependency that needed to be resolved.
Fixes: 20771ede1c0 ("pan/midgard: Add post-RA move elimination")
Signed-off-by: Alyssa Rosenzweig <[email protected]>
Diffstat (limited to 'src')
| -rw-r--r-- | src/panfrost/midgard/midgard_opt_dce.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/src/panfrost/midgard/midgard_opt_dce.c b/src/panfrost/midgard/midgard_opt_dce.c index 28f0886fe31..9964675763c 100644 --- a/src/panfrost/midgard/midgard_opt_dce.c +++ b/src/panfrost/midgard/midgard_opt_dce.c @@ -123,9 +123,8 @@ midgard_opt_post_move_eliminate(compiler_context *ctx, midgard_block *block, str if (mir_nontrivial_outmod(ins)) continue; if (ins->mask != 0xF) continue; - /* We do want to rewrite to keep the graph sane for pipeline - * register creation (TODO: is this the best approach?) */ - mir_rewrite_index_dst(ctx, ins->ssa_args.src[1], ins->ssa_args.dest); + /* We do need to rewrite to facilitate pipelining/scheduling */ + mir_rewrite_index(ctx, ins->ssa_args.src[1], ins->ssa_args.dest); /* We're good to go */ mir_remove_instruction(ins); |