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pan/bi: Implement shader-db stats

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v2: Drop register tracking since it was wrong, and meaningful accounting
is tricky for Bifrost (which wants round robin RA for at least some
registers)... we'll cross that bridge when we get there, possibly
preferring a "max liveness" estimate to the raw RA output.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7615>
This commit is contained in:
Alyssa Rosenzweig 2020-11-13 17:34:25 -05:00 • committed by Marge Bot
parent 45de02bdac
commit d299c2eb0b
2 changed files with 58 additions and 0 deletions
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1
src/panfrost/bifrost/bifrost.h
View file

@ -31,6 +31,7 @@
#define BIFROST_DBG_MSGS 0x0001
#define BIFROST_DBG_SHADERS 0x0002
#define BIFROST_DBG_SHADERDB 0x0004
extern int bifrost_debug;

57
src/panfrost/bifrost/bifrost_compile.c
View file

@ -40,11 +40,15 @@
static const struct debug_named_value debug_options[] = {
{"msgs", BIFROST_DBG_MSGS, "Print debug messages"},
{"shaders", BIFROST_DBG_SHADERS, "Dump shaders in NIR and MIR"},
{"shaderdb", BIFROST_DBG_SHADERDB, "Print statistics"},
DEBUG_NAMED_VALUE_END
};
DEBUG_GET_ONCE_FLAGS_OPTION(bifrost_debug, "BIFROST_MESA_DEBUG", debug_options, 0)
/* TODO: This is not thread safe!! */
static unsigned SHADER_DB_COUNT = 0;
int bifrost_debug = 0;
#define DBG(fmt, ...) \
@ -2356,6 +2360,54 @@ emit_cf_list(bi_context *ctx, struct exec_list *list)
return start_block;
}
/* shader-db stuff */
static void
bi_print_stats(bi_context *ctx, FILE *fp)
{
unsigned nr_clauses = 0, nr_tuples = 0, nr_ins = 0;
/* Count instructions, clauses, and tuples */
bi_foreach_block(ctx, _block) {
bi_block *block = (bi_block *) _block;
bi_foreach_clause_in_block(block, clause) {
nr_clauses++;
nr_tuples += clause->bundle_count;
for (unsigned i = 0; i < clause->bundle_count; ++i) {
if (clause->bundles[i].fma)
nr_ins++;
if (clause->bundles[i].add)
nr_ins++;
}
}
}
/* tuples = ((# of instructions) + (# of nops)) / 2 */
unsigned nr_nops = (2 * nr_tuples) - nr_ins;
/* In the future, we'll calculate thread count for v7. For now we
* always use fewer threads than we should (v6 style) due to missing
* piping, TODO: fix that for a nice perf win */
unsigned nr_threads = 1;
/* Dump stats */
fprintf(stderr, "shader%d - %s shader: "
"%u inst, %u nops, %u clauses, "
"%u threads, %u loops, "
"%u:%u spills:fills\n",
SHADER_DB_COUNT++,
ctx->is_blend ? "PAN_SHADER_BLEND" :
gl_shader_stage_name(ctx->stage),
nr_ins, nr_nops, nr_clauses,
nr_threads,
ctx->loop_count,
ctx->spills, ctx->fills);
}
static int
glsl_type_size(const struct glsl_type *type, bool bindless)
{
@ -2539,6 +2591,11 @@ bifrost_compile_shader_nir(void *mem_ctx, nir_shader *nir,
program->tls_size = ctx->tls_size;
if ((bifrost_debug & BIFROST_DBG_SHADERDB || inputs->shaderdb) &&
!nir->info.internal) {
bi_print_stats(ctx, stderr);
}
ralloc_free(ctx);
return program;