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pan/bi: Add option to test spilling

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BIFROST_MESA_DEBUG=spill now restricts the register file to 1/4 its usual size,
useful for testing register spilling (e.g. running CTS) as well as debugging
spilling on small shaders.

Note blend shaders are exempt, as we don't allow blend shaders to spill.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16314>
This commit is contained in:
Alyssa Rosenzweig 2022-05-03 17:05:57 -04:00 • committed by Marge Bot
parent 961b18ccbc
commit 6b6ace5199
3 changed files with 6 additions and 0 deletions
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4
src/panfrost/bifrost/bi_ra.c
View file

@ -314,6 +314,10 @@ bi_allocate_registers(bi_context *ctx, bool *success, bool full_regs)
full_regs ? BITFIELD64_MASK(64) :
(BITFIELD64_MASK(16) | (BITFIELD64_MASK(16) << 48));
/* To test spilling, mimic a small register file */
if (bifrost_debug & BIFROST_DBG_SPILL && !ctx->inputs->is_blend)
default_affinity &= BITFIELD64_MASK(48) << 8;
bi_foreach_instr_global(ctx, ins) {
bi_foreach_dest(ins, d) {
unsigned dest = bi_get_node(ins->dest[d]);

1
src/panfrost/bifrost/bifrost.h
View file

@ -47,6 +47,7 @@ extern "C" {
#define BIFROST_DBG_NOIDVS 0x0200
#define BIFROST_DBG_NOSB 0x0400
#define BIFROST_DBG_NOPRELOAD 0x0800
#define BIFROST_DBG_SPILL 0x1000
extern int bifrost_debug;

1
src/panfrost/bifrost/bifrost_compile.c
View file

@ -52,6 +52,7 @@ static const struct debug_named_value bifrost_debug_options[] = {
{"noidvs", BIFROST_DBG_NOIDVS, "Disable IDVS"},
{"nosb", BIFROST_DBG_NOSB, "Disable scoreboarding"},
{"nopreload", BIFROST_DBG_NOPRELOAD, "Disable message preloading"},
{"spill", BIFROST_DBG_SPILL, "Test register spilling"},
DEBUG_NAMED_VALUE_END
};