fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2025-12-26 23:40:10 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

freedreno/ir3: track register usage in first RA pass

Browse source 
We'll use the feedback from the first pass to select a target register
usage in the second pass.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4071>
This commit is contained in:
Rob Clark 2020-02-28 11:02:26 -08:00 • committed by Marge Bot
parent 9ae93be8fb
commit b2b349096f
1 changed files with 41 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

41
src/freedreno/ir3/ir3_ra.c
View file

@ -345,6 +345,15 @@ struct ir3_ra_ctx {
unsigned instr_cnt;
unsigned *def, *use; /* def/use table */
struct ir3_ra_instr_data *instrd;
/* Tracking for max half/full register assigned. We don't need to
* track high registers.
*
* The feedback about registers used in first pass is used to choose
* a target register usage to round-robin between in the 2nd pass.
*/
unsigned max_assigned;
unsigned max_half_assigned;
};
/* does it conflict? */
@ -1203,6 +1212,35 @@ reg_assign(struct ir3_ra_ctx *ctx, struct ir3_register *reg,
}
}
static void
account_assignment(struct ir3_ra_ctx *ctx, struct ir3_instruction *instr)
{
struct ir3_ra_instr_data *id;
struct ir3_register *dst = instr->regs[0];
unsigned max;
if (is_high(instr))
return;
if (dst->flags & IR3_REG_ARRAY) {
struct ir3_array *arr =
ir3_lookup_array(ctx->ir, dst->array.id);
max = arr->reg + arr->length;
} else if ((id = &ctx->instrd[instr->ip]) && id->defn) {
unsigned name = scalar_name(ctx, id->defn, 0);
unsigned r = ra_get_node_reg(ctx->g, name);
max = ctx->set->ra_reg_to_gpr[r] + id->off;
} else {
return;
}
if (is_half(instr)) {
ctx->max_half_assigned = MAX2(ctx->max_half_assigned, max);
} else {
ctx->max_assigned = MAX2(ctx->max_assigned, max);
}
}
/* helper to determine which regs to assign in which pass: */
static bool
should_assign(struct ir3_ra_ctx *ctx, struct ir3_instruction *instr)
@ -1220,6 +1258,7 @@ ra_block_alloc(struct ir3_ra_ctx *ctx, struct ir3_block *block)
struct ir3_register *reg;
if (writes_gpr(instr)) {
account_assignment(ctx, instr);
if (should_assign(ctx, instr)) {
reg_assign(ctx, instr->regs[0], instr);
if (instr->regs[0]->flags & IR3_REG_HALF)
@ -1517,6 +1556,8 @@ ir3_ra_pass(struct ir3_shader_variant *v, struct ir3_instruction **precolor,
ret = ra_alloc(&ctx);
ra_destroy(&ctx);
printf("#### max_assigned=%u, max_half_assigned=%u\n", ctx.max_assigned, ctx.max_half_assigned);
return ret;
}