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authorEric Anholt <eric@anholt.net>2017-02-24 14:18:39 -0800
committerEric Anholt <eric@anholt.net>2017-02-24 16:31:54 -0800
commit99d4203ad512023a47c8479ca0281dc3275886b8 (patch)
treee379a4064ff18af1b005d05cca6a402eecfbddac
parent30a4b25efe005c922f048beaf62852714d2462a1 (diff)
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.
-rw-r--r--src/gallium/drivers/vc4/vc4_qir_live_variables.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/src/gallium/drivers/vc4/vc4_qir_live_variables.c b/src/gallium/drivers/vc4/vc4_qir_live_variables.c
index 330e1c8f7a9..7108b3ee9b6 100644
--- a/src/gallium/drivers/vc4/vc4_qir_live_variables.c
+++ b/src/gallium/drivers/vc4/vc4_qir_live_variables.c
@@ -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);
+ }
}