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Switch remaining Neon variance functions to shifts

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Saves 5 instructions on 8x8 and 16x16 and 8 instructions
on 32x32, when compiled with 4.9.

Change-Id: Id3da613a36a9d27d8c5169c59ba45d247c920c6c
This commit is contained in:
Frank Galligan 2015-01-14 07:22:49 -08:00
parent bd3dbc588c
commit 588f74f8a6
1 changed files with 3 additions and 3 deletions
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6
vp9/encoder/arm/neon/vp9_variance_neon.c
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@ -91,7 +91,7 @@ unsigned int vp9_variance8x8_neon(const uint8_t *a, int a_stride,
unsigned int *sse) {
int sum;
variance_neon_w8(a, a_stride, b, b_stride, kWidth8, kHeight8, sse, &sum);
return *sse - (((int64_t)sum * sum) / (kWidth8 * kHeight8));
return *sse - (((int64_t)sum * sum) >> 6); // >> 6 = / 8 * 8
}
void vp9_get16x16var_neon(const uint8_t *src_ptr, int source_stride,
@ -106,7 +106,7 @@ unsigned int vp9_variance16x16_neon(const uint8_t *a, int a_stride,
unsigned int *sse) {
int sum;
variance_neon_w8(a, a_stride, b, b_stride, kWidth16, kHeight16, sse, &sum);
return *sse - (((int64_t)sum * sum) / (kWidth16 * kHeight16));
return *sse - (((int64_t)sum * sum) >> 8); // >> 8 = / 16 * 16
}
static void var_filter_block2d_bil_w8(const uint8_t *src_ptr,
@ -208,7 +208,7 @@ unsigned int vp9_variance32x32_neon(const uint8_t *a, int a_stride,
unsigned int *sse) {
int sum;
variance_neon_w8(a, a_stride, b, b_stride, kWidth32, kHeight32, sse, &sum);
return *sse - (((int64_t)sum * sum) / (kWidth32 * kHeight32));
return *sse - (((int64_t)sum * sum) >> 10); // >> 10 = / 32 * 32
}
unsigned int vp9_variance32x64_neon(const uint8_t *a, int a_stride,