coffee/libyuv
1
0
Fork 0
mirror of https://chromium.googlesource.com/libyuv/libyuv synced 2025-12-07 17:26:49 +08:00
Code Issues Packages Projects Releases Wiki Activity

[AArch64] Optimize ScaleARGBRowDown2Box_NEON

Browse Source 
Use a pair of LD2s to load data interleaved and perform a couple of
additions on the registers in order to avoid needing LD4 and ST4
instructions, since these are costly on some micro-architectures.

Reduction in run times:

 Cortex-A55: -20.5%
Cortex-A510: -28.3%
 Cortex-A76: -21.5%

Bug: libyuv:976
Change-Id: If66e1e148b031c2cd288ff412f351d7a0b9b91e7
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5371774
Reviewed-by: Justin Green <greenjustin@google.com>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
This commit is contained in:
Cosmina Dunca 2024-02-14 15:11:21 +00:00 committed by Frank Barchard
parent 9441ddd883
commit 9d200b704f
1 changed files with 18 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
source/scale_neon64.cc
View File

@ -1168,35 +1168,26 @@ void ScaleARGBRowDown2Box_NEON(const uint8_t* src_ptr,
ptrdiff_t src_stride,
uint8_t* dst,
int dst_width) {
const uint8_t* src_ptr1 = src_ptr + src_stride;
asm volatile(
// change the stride to row 2 pointer
"add %1, %1, %0 \n"
"1: \n"
"ld4 {v0.16b,v1.16b,v2.16b,v3.16b}, [%0], #64 \n" // load 16 ARGB
"subs %w3, %w3, #8 \n" // 8 processed per loop.
"uaddlp v0.8h, v0.16b \n" // B 16 bytes -> 8 shorts.
"uaddlp v1.8h, v1.16b \n" // G 16 bytes -> 8 shorts.
"uaddlp v2.8h, v2.16b \n" // R 16 bytes -> 8 shorts.
"uaddlp v3.8h, v3.16b \n" // A 16 bytes -> 8 shorts.
"ld4 {v16.16b,v17.16b,v18.16b,v19.16b}, [%1], #64 \n" // load 8
"uadalp v0.8h, v16.16b \n" // B 16 bytes -> 8 shorts.
"uadalp v1.8h, v17.16b \n" // G 16 bytes -> 8 shorts.
"prfm pldl1keep, [%0, 448] \n" // prefetch 7 lines ahead
"uadalp v2.8h, v18.16b \n" // R 16 bytes -> 8 shorts.
"uadalp v3.8h, v19.16b \n" // A 16 bytes -> 8 shorts.
"prfm pldl1keep, [%1, 448] \n"
"rshrn v0.8b, v0.8h, #2 \n" // round and pack
"rshrn v1.8b, v1.8h, #2 \n"
"rshrn v2.8b, v2.8h, #2 \n"
"rshrn v3.8b, v3.8h, #2 \n"
"st4 {v0.8b,v1.8b,v2.8b,v3.8b}, [%2], #32 \n"
"b.gt 1b \n"
: "+r"(src_ptr), // %0
"+r"(src_stride), // %1
"+r"(dst), // %2
"+r"(dst_width) // %3
"1: \n"
"ld2 {v0.4s, v1.4s}, [%[src]], #32 \n"
"ld2 {v20.4s, v21.4s}, [%[src1]], #32 \n"
"uaddl v2.8h, v0.8b, v1.8b \n"
"uaddl2 v3.8h, v0.16b, v1.16b \n"
"uaddl v22.8h, v20.8b, v21.8b \n"
"uaddl2 v23.8h, v20.16b, v21.16b \n"
"add v0.8h, v2.8h, v22.8h \n"
"add v1.8h, v3.8h, v23.8h \n"
"rshrn v0.8b, v0.8h, #2 \n"
"rshrn v1.8b, v1.8h, #2 \n"
"subs %w[width], %w[width], #4 \n"
"stp d0, d1, [%[dst]], #16 \n"
"b.gt 1b \n"
: [src] "+r"(src_ptr), [src1] "+r"(src_ptr1), [dst] "+r"(dst),
[width] "+r"(dst_width)
:
: "memory", "cc", "v0", "v1", "v2", "v3", "v16", "v17", "v18", "v19");
: "memory", "cc", "v0", "v1", "v2", "v3", "v20", "v21", "v22", "v23");
}
void ScaleARGBRowDownEven_NEON(const uint8_t* src_argb,