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pan/mdg: Respect !32-bit sizes in RA

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So we can take advantage of mediump.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5151>
This commit is contained in:
Alyssa Rosenzweig 2020-05-07 16:10:09 -04:00 • committed by Marge Bot
parent 8c012c8f8b
commit dbcae7c667
1 changed files with 8 additions and 4 deletions
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12
src/panfrost/midgard/midgard_ra.c
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@ -505,17 +505,21 @@ allocate_registers(compiler_context *ctx, bool *spilled)
if (ins->dest >= SSA_FIXED_MINIMUM) continue;
unsigned size = nir_alu_type_get_type_size(ins->dest_type);
/* 0 for x, 1 for xy, 2 for xyz, 3 for xyzw */
int class = util_logbase2(ins->mask);
int comps1 = util_logbase2(ins->mask);
int bytes = (comps1 + 1) * (size / 8);
/* Use the largest class if there's ambiguity, this
* handles partial writes */
int dest = ins->dest;
found_class[dest] = MAX2(found_class[dest], class);
found_class[dest] = MAX2(found_class[dest], bytes);
/* XXX: Ensure swizzles align the right way with more LCRA constraints? */
if (ins->type == TAG_ALU_4 && ins->alu.reg_mode != midgard_reg_mode_32)
if (ins->type == TAG_ALU_4 && size != 32)
min_alignment[dest] = 3; /* (1 << 3) = 8 */
if (ins->type == TAG_LOAD_STORE_4 && ins->load_64)
@ -532,7 +536,7 @@ allocate_registers(compiler_context *ctx, bool *spilled)
for (unsigned i = 0; i < ctx->temp_count; ++i) {
lcra_set_alignment(l, i, min_alignment[i] ? min_alignment[i] : 2);
lcra_restrict_range(l, i, (found_class[i] + 1) * 4);
lcra_restrict_range(l, i, found_class[i]);
}
free(found_class);