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Gaussian blur NEON optimized

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TBR=kjellander@chromium.org
BUG=libyuv:719
TEST=TestGaussCol_NEON

Change-Id: I52cb6dbfd0cab4a30205c93b6a528ef49e9ab529
Reviewed-on: https://chromium-review.googlesource.com/621708
Reviewed-by: Cheng Wang <wangcheng@google.com>
This commit is contained in:
Frank Barchard 2017-08-21 14:17:15 -07:00
parent 8cd3e4f3f2
commit 0c957d183e
1 changed files with 86 additions and 0 deletions
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86
source/row_neon64.cc
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@ -2692,6 +2692,92 @@ void ScaleSamples_NEON(const float* src, float* dst, float scale, int width) {
: "cc", "memory", "v1", "v2");
}
static vec16 kGauseCoefficients[4] = {
{1, 4, 6, 4, 1, 0, 0, 0},
{0, 1, 4, 6, 4, 1, 0, 0},
{0, 0, 1, 4, 6, 4, 1, 0},
{0, 0, 0, 1, 4, 6, 4, 1},
};
// filter 5 rows with 1, 4, 6, 4, 1 coefficients to produce 1 row.
void GaussRow_NEON(const uint16* src0,
uint16* dst,
int width) {
asm volatile(
"ld1 {v20.8h,v21.8h,v22.8h,v23.8h}, [%3] \n"
"1: \n"
"ld1 {v0.8h}, [%0], %4 \n" // load 8 source samples
"subs %w2, %w2, #4 \n" // 4 processed per loop
"umull v1.4s, v0.4h, v20.4h \n" // first pixel
"umlal2 v1.4s, v0.8h, v20.8h \n"
"addv s1, v1.4s \n"
"umull v2.4s, v0.4h, v21.4h \n" // second pixel
"umlal2 v2.4s, v0.8h, v21.8h \n"
"addv s2, v2.4s \n"
"umull v3.4s, v0.4h, v22.4h \n" // third pixel
"umlal2 v3.4s, v0.8h, v22.8h \n"
"addv s3, v3.4s \n"
"umull v4.4s, v0.4h, v23.4h \n" // forth pixel
"umlal2 v4.4s, v0.8h, v23.8h \n"
"addv s4, v4.4s \n"
"st4 {v1.s,v2.s,v3.s,v4.s}[0], [%1], #16 \n" // store 4 samples
"b.gt 1b \n"
: "+r"(src0), // %0
"+r"(dst), // %1
"+r"(width) // %2
: "r"(&kGauseCoefficients[0]) // %3
"r"(8LL) // %4
: "cc", "memory", "v0", "v1", "v2", "v3", "v4",
"v20", "v21", "v22", "v23");
}
// filter 5 rows with 1, 4, 6, 4, 1 coefficients to produce 1 row.
void GaussCol_NEON(const uint32* src0,
const uint32* src1,
const uint32* src2,
const uint32* src3,
const uint32* src4,
uint16* dst,
int width) {
asm volatile(
"movi v5.4s, #4 \n" // constant 4
"movi v6.4s, #6 \n" // constant 6
"1: \n"
"ld1 {v0.4s}, [%0], #16 \n" // load 4 samples, 5 rows
"ld1 {v1.4s}, [%1], #16 \n"
"ld1 {v2.4s}, [%2], #16 \n"
"ld1 {v3.4s}, [%3], #16 \n"
"ld1 {v4.4s}, [%4], #16 \n"
"subs %w6, %w6, #4 \n" // 4 processed per loop
"add v0.4s, v0.4s, v4.4s \n" // * 1
"mla v0.4s, v1.4s, v5.4s \n" // * 4
"mla v0.4s, v2.4s, v6.4s \n" // * 6
"mla v0.4s, v3.4s, v5.4s \n" // * 4
"uqshrn v0.4h, v0.4s, #8 \n" // round, shift by 8 pack.
"st1 {v0.4h}, [%5], #8 \n" // store 4 samples
"b.gt 1b \n"
: "+r"(src0), // %0
"+r"(src1), // %1
"+r"(src2), // %2
"+r"(src3), // %3
"+r"(src4), // %4
"+r"(dst), // %5
"+r"(width) // %6
:
: "cc", "memory", "v1", "v2", "v3", "v4", "v5", "v6");
}
#endif // !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__)
#ifdef __cplusplus