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agx: Implement loops in the simplest way

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Again, optimizations are possible, but for now go for conformance.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11023>
This commit is contained in:
Alyssa Rosenzweig 2021-05-26 19:51:46 -04:00 • committed by Alyssa Rosenzweig
parent 11705488ed
commit dd06e6af34
1 changed files with 22 additions and 1 deletions
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23
src/asahi/compiler/agx_compile.c
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@ -793,7 +793,28 @@ emit_if(agx_context *ctx, nir_if *nif)
static void
emit_loop(agx_context *ctx, nir_loop *nloop)
{
unreachable("loops todo");
/* We only track nesting within the innermost loop, so reset */
ctx->loop_nesting = 0;
/* Make room for break/continue nesting (TODO: skip if no divergent CF) */
agx_builder _b = agx_init_builder(ctx, agx_after_block(ctx->current_block));
agx_push_exec(&_b, 2);
/* Emit the body */
agx_block *start_block = emit_cf_list(ctx, &nloop->body);
/* Fix up the nesting counter via an always true while_icmp, and branch back
* to start of loop if any lanes are active */
_b.cursor = agx_after_block(ctx->current_block);
agx_while_icmp(&_b, agx_zero(), agx_zero(), 2, AGX_ICOND_UEQ, false);
agx_jmp_exec_any(&_b, start_block);
agx_pop_exec(&_b, 2);
/* Update shader-db stats */
++ctx->loop_count;
/* All nested control flow must have finished */
assert(ctx->loop_nesting == 0);
}
static agx_block *