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agx: Zero r0l before first use of control flow

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Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11023>
This commit is contained in:
Alyssa Rosenzweig
2021-05-24 20:38:41 -04:00
parent 839fff846a
commit e9483110d2
2 changed files with 23 additions and 0 deletions
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20
src/asahi/compiler/agx_compile.c
View File

@@ -847,6 +847,24 @@ emit_loop(agx_context *ctx, nir_loop *nloop)
assert(ctx->loop_nesting == 0);
}
/* Before the first control flow structure, the nesting counter (r0l) needs to
* be zeroed for correct operation. This only happens at most once, since by
* definition this occurs at the end of the first block, which dominates the
* rest of the program. */
static void
emit_first_cf(agx_context *ctx)
{
if (ctx->any_cf)
return;
agx_builder _b = agx_init_builder(ctx, agx_after_block(ctx->current_block));
agx_index r0l = agx_register(0, false);
agx_mov_to(&_b, r0l, agx_immediate(0));
ctx->any_cf = true;
}
static agx_block *
emit_cf_list(agx_context *ctx, struct exec_list *list)
{
@@ -864,10 +882,12 @@ emit_cf_list(agx_context *ctx, struct exec_list *list)
}
case nir_cf_node_if:
emit_first_cf(ctx);
emit_if(ctx, nir_cf_node_as_if(node));
break;
case nir_cf_node_loop:
emit_first_cf(ctx);
emit_loop(ctx, nir_cf_node_as_loop(node));
break;

3
src/asahi/compiler/agx_compiler.h
View File

@@ -334,6 +334,9 @@ typedef struct {
/* I don't really understand how writeout ops work yet */
bool did_writeout;
/* Has r0l been zeroed yet due to control flow? */
bool any_cf;
/* Number of nested control flow structures within the innermost loop. Since
* NIR is just loop and if-else, this is the number of nested if-else
* statements in the loop */