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ARGBScaleDown by 2 with nearest neighbor optimized

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TBR=kjellander@chromium.org
BUG=libyuv:723
TEST=ScaleDownBy2_None

Change-Id: I6861e62d3a67dde916b87fdc46eb02f2b4ee9f17
Reviewed-on: https://chromium-review.googlesource.com/644149
Reviewed-by: Frank Barchard <fbarchard@google.com>
Reviewed-by: Cheng Wang <wangcheng@google.com>
This commit is contained in:
Frank Barchard 2017-08-30 15:35:01 -07:00
parent 1c85f98846
commit a826dd7112
1 changed files with 14 additions and 6 deletions
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20
source/scale_neon.cc
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@ -704,13 +704,12 @@ void ScaleARGBRowDown2_NEON(const uint8* src_ptr,
int dst_width) {
(void)src_stride;
asm volatile(
"1: \n"
// load even pixels into q0, odd into q1
"vld2.32 {q0, q1}, [%0]! \n"
"vld2.32 {q2, q3}, [%0]! \n"
"1: \n"
"vld4.32 {d0, d2, d4, d6}, [%0]! \n" // load 8 ARGB pixels.
"vld4.32 {d1, d3, d5, d7}, [%0]! \n" // load next 8 ARGB
"subs %2, %2, #8 \n" // 8 processed per loop
"vst1.32 {q1}, [%1]! \n" // store odd pixels
"vst1.32 {q3}, [%1]! \n"
"vmov q2, q1 \n" // load next 8 ARGB
"vst2.32 {q2, q3}, [%1]! \n" // store odd pixels
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst), // %1
@ -720,6 +719,15 @@ void ScaleARGBRowDown2_NEON(const uint8* src_ptr,
);
}
// 46: f964 018d vld4.32 {d16,d18,d20,d22}, [r4]!
// 4a: 3e04 subs r6, #4
// 4c: f964 118d vld4.32 {d17,d19,d21,d23}, [r4]!
// 50: ef64 21f4 vorr q9, q10, q10
// 54: f942 038d vst2.32 {d16-d19}, [r2]!
// 58: d1f5 bne.n 46 <ScaleARGBRowDown2_C+0x46>
void ScaleARGBRowDown2Linear_NEON(const uint8* src_argb,
ptrdiff_t src_stride,
uint8* dst_argb,