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ir3/ra: try to allocate overlapping regs for shared subreg movs

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This was implemented for vector RA but not for shared RA yet.

Totals from 1361 (0.77% of 176279) affected shaders:
Instrs: 1175437 -> 1170238 (-0.44%); split: -0.45%, +0.01%
CodeSize: 2300656 -> 2290258 (-0.45%)
NOPs: 221042 -> 220527 (-0.23%); split: -0.48%, +0.25%
MOVs: 30645 -> 30643 (-0.01%); split: -0.01%, +0.00%
COVs: 47425 -> 47016 (-0.86%)
(ss): 35953 -> 35890 (-0.18%); split: -0.21%, +0.03%
(sy): 20174 -> 20168 (-0.03%)
(ss)-stall: 124094 -> 123625 (-0.38%); split: -0.38%, +0.00%
(sy)-stall: 806166 -> 805832 (-0.04%); split: -0.06%, +0.02%
Preamble Instrs: 173151 -> 171299 (-1.07%)
Cat0: 250836 -> 250321 (-0.21%); split: -0.43%, +0.22%
Cat1: 78738 -> 78327 (-0.52%); split: -0.52%, +0.00%
Cat2: 386528 -> 382255 (-1.11%)

Signed-off-by: Job Noorman <jnoorman@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38573>
This commit is contained in:
Job Noorman 2025-11-21 10:51:38 +01:00 • committed by Marge Bot
parent 1fc49eb120
commit 233b77878d
1 changed files with 37 additions and 0 deletions
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37
src/freedreno/ir3/ir3_shared_ra.c
View file

@ -667,9 +667,46 @@ free_space(struct ra_ctx *ctx, physreg_t start, unsigned size)
}
}
static physreg_t
try_allocate_src_subreg(struct ra_ctx *ctx, struct ir3_register *reg,
enum ir3_subreg_move subreg_move)
{
assert(subreg_move != IR3_SUBREG_MOVE_NONE);
/* Subreg moves always write a half register. */
assert(reg_elem_size(reg) == 1);
struct ir3_register *src = reg->instr->srcs[0];
if (!ra_reg_is_src(src) || !(src->flags & IR3_REG_SHARED))
return ~0;
unsigned offset = subreg_move == IR3_SUBREG_MOVE_LOWER ? 0 : 1;
struct ra_interval *src_interval = ra_interval_get(ctx, src->def);
physreg_t src_physreg = ra_interval_get_physreg(src_interval) + offset;
unsigned file_size = reg_file_size(reg);
unsigned size = reg_size(reg);
if (src_physreg + size <= file_size &&
get_reg_specified(ctx, reg, src_physreg)) {
return src_physreg;
}
return ~0;
}
static physreg_t
get_reg(struct ra_ctx *ctx, struct ir3_register *reg, bool src)
{
/* For subreg moves (see ir3_is_subreg_move), try to allocate half of their
* full src for their dst. If this succeeds, the instruction can be removed.
*/
enum ir3_subreg_move subreg_move = ir3_is_subreg_move(reg->instr);
if (subreg_move != IR3_SUBREG_MOVE_NONE) {
physreg_t src_reg = try_allocate_src_subreg(ctx, reg, subreg_move);
if (src_reg != (physreg_t)~0)
return src_reg;
}
if (reg->merge_set && reg->merge_set->preferred_reg != (physreg_t)~0) {
physreg_t preferred_reg =
reg->merge_set->preferred_reg + reg->merge_set_offset;