Mesa (main): intel/eu: Don't double-loop as often in brw_set_uip_jip
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gitlab-mirror at kemper.freedesktop.org
Sat Dec 18 02:05:02 UTC 2021
Module: Mesa
Branch: main
Commit: e6f0def97df3f83823bd1300e334ce48b23be005
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=e6f0def97df3f83823bd1300e334ce48b23be005
Author: Jason Ekstrand <jason at jlekstrand.net>
Date: Tue Nov 9 16:09:23 2021 -0600
intel/eu: Don't double-loop as often in brw_set_uip_jip
brw_find_next_block_end() scans through the instructions to find the end
of the block. We were calling it for every instruction in the program
which is, if you have a single basic block, makes the whole mess a nice
clean O(n^2) when it really doesn't need to be. Instead, only call
brw_find_next_block_end() as-needed. This brings it back to O(n) like
it should have been.
This cuts the runtime of the following Vulkan CTS on my SKL box by 5%
from 1:51 to 1:45: dEQP-VK.ssbo.phys.layout.random.16bit.scalar.13
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Emma Anholt <emma at anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13734>
---
src/intel/compiler/brw_eu_emit.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/src/intel/compiler/brw_eu_emit.c b/src/intel/compiler/brw_eu_emit.c
index 1cb01367d4f..32cfae00093 100644
--- a/src/intel/compiler/brw_eu_emit.c
+++ b/src/intel/compiler/brw_eu_emit.c
@@ -2992,9 +2992,9 @@ brw_set_uip_jip(struct brw_codegen *p, int start_offset)
brw_inst *insn = store + offset;
assert(brw_inst_cmpt_control(devinfo, insn) == 0);
- int block_end_offset = brw_find_next_block_end(p, offset);
switch (brw_inst_opcode(devinfo, insn)) {
- case BRW_OPCODE_BREAK:
+ case BRW_OPCODE_BREAK: {
+ int block_end_offset = brw_find_next_block_end(p, offset);
assert(block_end_offset != 0);
brw_inst_set_jip(devinfo, insn, (block_end_offset - offset) / scale);
/* Gfx7 UIP points to WHILE; Gfx6 points just after it */
@@ -3002,7 +3002,10 @@ brw_set_uip_jip(struct brw_codegen *p, int start_offset)
(brw_find_loop_end(p, offset) - offset +
(devinfo->ver == 6 ? 16 : 0)) / scale);
break;
- case BRW_OPCODE_CONTINUE:
+ }
+
+ case BRW_OPCODE_CONTINUE: {
+ int block_end_offset = brw_find_next_block_end(p, offset);
assert(block_end_offset != 0);
brw_inst_set_jip(devinfo, insn, (block_end_offset - offset) / scale);
brw_inst_set_uip(devinfo, insn,
@@ -3011,8 +3014,10 @@ brw_set_uip_jip(struct brw_codegen *p, int start_offset)
assert(brw_inst_uip(devinfo, insn) != 0);
assert(brw_inst_jip(devinfo, insn) != 0);
break;
+ }
case BRW_OPCODE_ENDIF: {
+ int block_end_offset = brw_find_next_block_end(p, offset);
int32_t jump = (block_end_offset == 0) ?
1 * br : (block_end_offset - offset) / scale;
if (devinfo->ver >= 7)
@@ -3022,7 +3027,7 @@ brw_set_uip_jip(struct brw_codegen *p, int start_offset)
break;
}
- case BRW_OPCODE_HALT:
+ case BRW_OPCODE_HALT: {
/* From the Sandy Bridge PRM (volume 4, part 2, section 8.3.19):
*
* "In case of the halt instruction not inside any conditional
@@ -3034,6 +3039,7 @@ brw_set_uip_jip(struct brw_codegen *p, int start_offset)
* The uip will have already been set by whoever set up the
* instruction.
*/
+ int block_end_offset = brw_find_next_block_end(p, offset);
if (block_end_offset == 0) {
brw_inst_set_jip(devinfo, insn, brw_inst_uip(devinfo, insn));
} else {
@@ -3042,6 +3048,7 @@ brw_set_uip_jip(struct brw_codegen *p, int start_offset)
assert(brw_inst_uip(devinfo, insn) != 0);
assert(brw_inst_jip(devinfo, insn) != 0);
break;
+ }
default:
break;
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