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vc4: Emit max number of temps in the shader-db output. 

We need to be paying attention to optimization's impact on this -- even if
we reduce instruction count, increasing max temps in general is likely to
cause us to fail to register allocate on some shaders, which means that
those won't run at all.
This commit is contained in:
Eric Anholt 2017-02-24 14:18:39 -08:00
parent 30a4b25efe
commit 99d4203ad5
1 changed files with 23 additions and 0 deletions
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23
src/gallium/drivers/vc4/vc4_qir_live_variables.c
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@ -327,4 +327,27 @@ qir_calculate_live_intervals(struct vc4_compile *c)
;
qir_compute_start_end(c, c->num_temps);
if (vc4_debug & VC4_DEBUG_SHADERDB) {
int last_ip = 0;
for (int i = 0; i < c->num_temps; i++)
last_ip = MAX2(last_ip, c->temp_end[i]);
int reg_pressure = 0;
int max_reg_pressure = 0;
for (int i = 0; i < last_ip; i++) {
for (int j = 0; j < c->num_temps; j++) {
if (c->temp_start[j] == i)
reg_pressure++;
if (c->temp_end[j] == i)
reg_pressure--;
}
max_reg_pressure = MAX2(max_reg_pressure, reg_pressure);
}
fprintf(stderr, "SHADER-DB: %s prog %d/%d: %d max temps\n",
qir_get_stage_name(c->stage),
c->program_id, c->variant_id,
max_reg_pressure);
}
}