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pan/mdg: Model blend shader interference 

Backport of 4439757db2 ("pan/bi: Use the interference mechanism
to describe blend shader reg use") to Midgard.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9239>
This commit is contained in:
Alyssa Rosenzweig 2021-05-06 19:16:33 -04:00 committed by Marge Bot
parent 90cbab7cae
commit 54046d61f8
1 changed files with 23 additions and 6 deletions
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29
src/panfrost/midgard/midgard_ra.c
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@ -356,11 +356,27 @@ mir_compute_interference(
unsigned dest = ins->dest;
if (dest < ctx->temp_count) {
for (unsigned i = 0; i < ctx->temp_count; ++i)
for (unsigned i = 0; i < ctx->temp_count; ++i) {
if (live[i]) {
unsigned mask = mir_bytemask(ins);
lcra_add_node_interference(l, dest, mask, i, live[i]);
}
}
}
/* Add blend shader interference: blend shaders might
* clobber r0-r3. */
if (ins->compact_branch && ins->writeout) {
for (unsigned i = 0; i < ctx->temp_count; ++i) {
if (!live[i])
continue;
for (unsigned j = 0; j < 4; j++) {
lcra_add_node_interference(l, ctx->temp_count + j,
0xFFFF,
i, live[i]);
}
}
}
/* Update live_in */
@ -402,11 +418,11 @@ allocate_registers(compiler_context *ctx, bool *spilled)
if (!ctx->temp_count)
return NULL;
/* Initialize LCRA. Allocate an extra node at the end for a precoloured
* r1 for interference */
/* Initialize LCRA. Allocate extra node at the end for r1-r3 for
* interference */
struct lcra_state *l = lcra_alloc_equations(ctx->temp_count + 1, 5);
unsigned node_r1 = ctx->temp_count;
struct lcra_state *l = lcra_alloc_equations(ctx->temp_count + 4, 5);
unsigned node_r1 = ctx->temp_count + 1;
/* Starts of classes, in bytes */
l->class_start[REG_CLASS_WORK] = 16 * 0;
@ -597,7 +613,8 @@ allocate_registers(compiler_context *ctx, bool *spilled)
* the following segment. We model this as interference.
*/
l->solutions[node_r1] = (16 * 1);
for (unsigned i = 0; i < 4; ++i)
l->solutions[ctx->temp_count + i] = (16 * i);
mir_foreach_block(ctx, _blk) {
midgard_block *blk = (midgard_block *) _blk;