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agx: factor out reserved_region

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Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31532>
This commit is contained in:
Alyssa Rosenzweig 2024-09-22 17:17:11 -04:00 • committed by Marge Bot
parent 0bd23366b1
commit fb3e11ac1a
1 changed files with 20 additions and 13 deletions
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33
src/asahi/compiler/agx_register_allocate.c
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@ -125,6 +125,25 @@ struct ra_ctx {
unsigned bound[RA_CLASSES];
};
/*
* RA treats the nesting counter, the divergent shuffle temporary, and the
* spiller temporaries as alive throughout if used anywhere. This could be
* optimized. Using a single power-of-two reserved region at the start ensures
* these registers are never shuffled.
*/
static unsigned
reserved_size(agx_context *ctx)
{
if (ctx->has_spill_pcopy_reserved)
return 8;
else if (ctx->any_quad_divergent_shuffle)
return 2;
else if (ctx->any_cf)
return 1;
else
return 0;
}
enum agx_size
agx_split_width(const agx_instr *I)
{
@ -177,19 +196,7 @@ agx_calc_register_demand(agx_context *ctx)
unsigned max_demand = 0;
agx_foreach_block(ctx, block) {
unsigned demand = 0;
/* RA treats the nesting counter as alive throughout if control flow is
* used anywhere. This could be optimized.
*/
if (ctx->any_cf)
demand++;
if (ctx->any_quad_divergent_shuffle)
demand++;
if (ctx->has_spill_pcopy_reserved)
demand = 8;
unsigned demand = reserved_size(ctx);
/* Everything live-in */
{