[Mesa-dev] [PATCH 2/5] radeonsi: set dereferenceable attribute on descriptor arrays
Marek Olšák
maraeo at gmail.com
Tue Jul 12 20:52:35 UTC 2016
From: Marek Olšák <marek.olsak at amd.com>
This allows moving the loads arbitrarily in the Sinking pass.
26002 shaders in 14643 tests
Totals:
SGPRS: 2080160 -> 2080160 (0.00 %)
VGPRS: 798875 -> 797826 (-0.13 %)
Spilled SGPRs: 108485 -> 79165 (-27.03 %)
Spilled VGPRs: 327 -> 327 (0.00 %)
Scratch VGPRs: 1656 -> 1652 (-0.24 %) dwords per thread
Code Size: 36127192 -> 35559780 (-1.57 %) bytes
LDS: 767 -> 767 (0.00 %) blocks
Max Waves: 212464 -> 212672 (0.10 %)
Wait states: 0 -> 0 (0.00 %)
PERCENTAGES / App Shaders SGPRs VGPRs SpillSGPR SpillVGPR Scratch CodeSize MaxWaves Waits
(unknown) 4 . . . . . . . .
0ad 6 . . . . . . . .
alien_isolation 2938 . 0.04 % -8.53 % . . -0.71 % -0.06 % .
anholt 10 . . . . . . . .
batman_arkham_origins 589 . -0.58 % -79.54 % . . -6.72 % 0.57 % .
bioshock-infinite 1769 . -0.65 % -89.32 % . . -4.73 % 0.48 % .
borderlands2 3968 . -0.31 % -51.21 % . . -4.09 % 0.22 % .
brutal-legend 338 . -0.03 % -2.95 % . . -0.06 % . .
civilization_beyond.. 116 . . -14.17 % . . -0.88 % . .
counter_strike_glob.. 1142 . . . . . . . .
dirt-showdown 541 . -0.56 % -40.14 % . -3.45 % -1.82 % 0.35 % .
dolphin 22 . . . . . 0.16 % . .
dota2 1747 . . . . . 0.01 % . .
europa_universalis_4 76 . -0.23 % -42.11 % . . -0.96 % . .
f1-2015 774 . -0.09 % -28.89 % . . -2.60 % 0.09 % .
furmark-0.7.0 4 . . . . . . . .
gimark-0.7.0 10 . . . . . . . .
glamor 16 . . . . . . . .
humus-celshading 4 . . . . . . . .
humus-domino 6 . . . . . . . .
humus-dynamicbranching 24 . 0.71 % . . . 0.29 % -0.45 % .
humus-hdr 10 . . . . . . . .
humus-portals 2 . . . . . . . .
humus-volumetricfog.. 6 . . . . . . . .
left_4_dead_2 1762 . . . . . . . .
metro_2033_redux 2670 . -0.10 % -7.15 % . . -0.03 % . .
nexuiz 80 . . . . . . . .
pixmark-julia-fp32 2 . . . . . . . .
pixmark-julia-fp64 2 . . . . . . . .
pixmark-piano-0.7.0 2 . . . . . . . .
pixmark-volplosion-.. 2 . . . . . . . .
plot3d-0.7.0 8 . . . . . . . .
portal 474 . . . . . . . .
sauerbraten 7 . . . . . . . .
serious_sam_3_bfe 392 . . -13.20 % . . -1.81 % . .
supertuxkart 4 . . . . . . . .
talos_principle 324 . -0.21 % -18.39 % . . -2.73 % 0.14 % .
team_fortress_2 808 . . . . . . . .
tesseract 430 . 0.08 % -68.57 % . . -0.45 % . .
tessmark-0.7.0 6 . . . . . . . .
thea 172 . . . . . 0.03 % . .
ue4_effects_cave 299 . -0.04 % -10.15 % . . -0.25 % 0.04 % .
ue4_elemental 586 . -0.02 % -13.93 % . . -0.13 % 0.02 % .
ue4_lightroom_inter.. 74 . -0.17 % -70.00 % . . -1.27 % . .
ue4_realistic_rende.. 92 . . -32.58 % . . -0.35 % . .
unigine_heaven 322 . 0.12 % -54.17 % . . -1.42 % -0.12 % .
unigine_sanctuary 264 . . . . . . . .
unigine_tropics 210 . . . . . . . .
unigine_valley 278 . -0.15 % -40.74 % . . -2.00 % 0.09 % .
unity 72 . . . . . 0.03 % . .
warsow 176 . . . . . . . .
warzone2100 4 . . . . . 0.13 % . .
witcher2 1040 . -0.03 % -86.28 % . . -0.28 % 0.01 % .
xcom_enemy_within 1236 . -0.24 % -63.54 % . . -0.93 % 0.18 % .
yofrankie 82 . -0.61 % -100.00 % . . -0.83 % 0.41 % .
-----------------------------------------------------------------------------------------------------------
Total 26002 . -0.13 % -27.03 % . -0.24 % -1.57 % 0.10 % .
---
src/gallium/drivers/radeonsi/si_shader.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 31140b1..b23c7c6 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -33,6 +33,7 @@
#include "gallivm/lp_bld_arit.h"
#include "gallivm/lp_bld_bitarit.h"
#include "gallivm/lp_bld_flow.h"
+#include "gallivm/lp_bld_misc.h"
#include "radeon/r600_cs.h"
#include "radeon/radeon_llvm.h"
#include "radeon/radeon_elf_util.h"
@@ -5311,11 +5312,17 @@ static void si_create_function(struct si_shader_context *ctx,
for (i = 0; i <= last_sgpr; ++i) {
LLVMValueRef P = LLVMGetParam(ctx->radeon_bld.main_fn, i);
- /* We tell llvm that array inputs are passed by value to allow Sinking pass
- * to move load. Inputs are constant so this is fine. */
- if (i <= last_array_pointer)
+ /* The combination of:
+ * - ByVal
+ * - dereferenceable
+ * - tbaa
+ * allows the optimization passes to move loads and reduces
+ * SGPR spilling significantly.
+ */
+ if (i <= last_array_pointer) {
LLVMAddAttribute(P, LLVMByValAttribute);
- else
+ lp_add_attr_dereferenceable(P, UINT64_MAX);
+ } else
LLVMAddAttribute(P, LLVMInRegAttribute);
}
--
2.7.4
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