fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-05-08 04:48:08 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

pan/crc: Optimize clear color hashing

Browse source 
Take advantage of XOR associativity to break the loop-carried
dependency chain and help compiler auto-vectorization.

Signed-off-by: Loïc Molinari <loic.molinari@collabora.com>
This commit is contained in:
Loïc Molinari 2026-02-11 16:07:54 +01:00
parent 915085886c
commit 74c26ebaa4
1 changed files with 4 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
src/panfrost/lib/pan_desc.c
View file

@ -1103,6 +1103,7 @@ pan_crc_maybe_enable_flushed(struct pan_crc *crc, struct pan_crc_state *state,
static uint64_t
pan_crc_clear_color(const struct pan_fb_info *fb)
{
uint64_t base[4] = { 0, }; /* Compiler auto-vectorization hint */
uint64_t crc_clear_flag = 1;
uint64_t crc_clear_base = 0;
uint64_t crc_init = 0;
@ -1139,7 +1140,9 @@ pan_crc_clear_color(const struct pan_fb_info *fb)
for (unsigned i = 0; i < fb->rt_count; ++i)
if (fb->rts[i].clear)
for (unsigned j = 0; j < 4; ++j)
crc_clear_base ^= 32749 * fb->rts[i].clear_value[j];
base[i] ^= 32749 * fb->rts[i].clear_value[j];
crc_clear_base = (base[0] ^ base[1]) ^ (base[2] ^ base[3]);
return (crc_clear_flag << 63) | (crc_clear_base << 16) | crc_init;
}