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pan/midgard: Extend liveness analysis to st_vary

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These can consume sources now.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig 2019-07-24 11:16:15 -07:00
parent dca0166ce1
commit 0f38f6466e
1 changed files with 1 additions and 8 deletions
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9
src/panfrost/midgard/midgard_ra.c
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@ -372,20 +372,13 @@ allocate_registers(compiler_context *ctx, bool *spilled)
mir_foreach_instr_in_block(block, ins) {
if (ins->compact_branch) continue;
/* Dest is < 0 for st_vary instructions, which break
* the usual SSA conventions. Liveness analysis doesn't
* make sense on these instructions, so skip them to
* avoid memory corruption */
if (ins->ssa_args.dest < 0) continue;
if (ins->ssa_args.dest < SSA_FIXED_MINIMUM) {
/* If this destination is not yet live, it is
* now since we just wrote it */
int dest = ins->ssa_args.dest;
if (live_start[dest] == -1)
if (dest >= 0 && live_start[dest] == -1)
live_start[dest] = d;
}