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pan/bi: Implement bi_spill_register 

Given a node to spill, insert the appropriate loads and stores to spill
it.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7206>
This commit is contained in:
Alyssa Rosenzweig 2020-10-14 20:37:45 -04:00 committed by Marge Bot
parent 82dbc4ea78
commit 2d0f46a181
1 changed files with 54 additions and 0 deletions
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54
src/panfrost/bifrost/bi_ra.c
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@ -287,6 +287,60 @@ bi_choose_spill_node(bi_context *ctx, struct lcra_state *l)
return lcra_get_best_spill_node(l);
}
/* Once we've chosen a spill node, spill it. Precondition: node is a valid
* SSA node in the non-optimized scheduled IR that was not already
* spilled (enforced by bi_choose_spill_node). Returns bytes spilled */
static unsigned
bi_spill_register(bi_context *ctx, unsigned node, unsigned offset)
{
assert(!(node & PAN_IS_REG));
unsigned channels = 1;
/* Spill after every store */
bi_foreach_block(ctx, _block) {
bi_block *block = (bi_block *) _block;
bi_foreach_clause_in_block_safe(block, clause) {
bi_instruction *ins = bi_unwrap_singleton(clause);
if (ins->dest != node) continue;
ins->dest = bi_make_temp(ctx);
ins->no_spill = true;
channels = MAX2(channels, ins->vector_channels);
bi_instruction st = bi_spill(ins->dest, offset, channels);
bi_insert_singleton(ctx, clause, block, st, false);
ctx->spills++;
}
}
/* Fill before every use */
bi_foreach_block(ctx, _block) {
bi_block *block = (bi_block *) _block;
bi_foreach_clause_in_block_safe(block, clause) {
bi_instruction *ins = bi_unwrap_singleton(clause);
if (!bi_has_arg(ins, node)) continue;
/* Don't rewrite spills themselves */
if (ins->segment == BI_SEGMENT_TLS) continue;
unsigned index = bi_make_temp(ctx);
bi_instruction ld = bi_fill(index, offset, channels);
ld.no_spill = true;
bi_insert_singleton(ctx, clause, block, ld, true);
/* Rewrite to use */
bi_rewrite_index_src_single(ins, node, index);
ctx->fills++;
}
}
return (channels * 4);
}
void
bi_register_allocate(bi_context *ctx)
{