vmx: optimize scaled_nearest_scanline_vmx_8888_8888_OVER
This patch optimizes scaled_nearest_scanline_vmx_8888_8888_OVER and all
the functions it calls (combine1, combine4 and
core_combine_over_u_pixel_vmx).
The optimization is done by removing use of expand_alpha_1x128 and
expand_alpha_2x128 in favor of splat_alpha and MUL/ADD macros from
pixman_combine32.h.
Running "lowlevel-blt-bench -n over_8888_8888" on POWER8, 8 cores,
3.4GHz, RHEL 7.2 ppc64le gave the following results:
reference memcpy speed = 24847.3MB/s (6211.8MP/s for 32bpp fills)
Before After Change
--------------------------------------------
L1 182.05 210.22 +15.47%
L2 180.6 208.92 +15.68%
M 180.52 208.22 +15.34%
HT 130.17 178.97 +37.49%
VT 145.82 184.22 +26.33%
R 104.51 129.38 +23.80%
RT 48.3 61.54 +27.41%
Kops/s 430 504 +17.21%
v2: Check *pm is not NULL before dereferencing it in combine1()
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
1 file changed
