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Simplify forward-WHT + SSE2 version

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no precision loss observed
speed is not really faster (0.5% at max), as forward-WHT isn't called often.

also: replaced a "int << 3" (undefined by C-spec) by a "int * 8"
( supersedes https://gerrit.chromium.org/gerrit/#/c/48739/ )

Change-Id: I2d980ec2f20f4ff6be5636105ff4f1c70ffde401
This commit is contained in:
skal 2013-04-26 08:55:31 +02:00
parent 878b9da5bf
commit 9c4ce971a8
3 changed files with 58 additions and 47 deletions
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29
src/dsp/enc.c
View File

@ -142,9 +142,9 @@ static void FTransform(const uint8_t* src, const uint8_t* ref, int16_t* out) {
const int a1 = (d1 + d2);
const int a2 = (d1 - d2);
const int a3 = (d0 - d3);
tmp[0 + i * 4] = (a0 + a1) << 3; // 14b [-8160,8160]
tmp[0 + i * 4] = (a0 + a1) * 8; // 14b [-8160,8160]
tmp[1 + i * 4] = (a2 * 2217 + a3 * 5352 + 1812) >> 9; // [-7536,7542]
tmp[2 + i * 4] = (a0 - a1) << 3;
tmp[2 + i * 4] = (a0 - a1) * 8;
tmp[3 + i * 4] = (a3 * 2217 - a2 * 5352 + 937) >> 9;
}
for (i = 0; i < 4; ++i) {
@ -187,31 +187,32 @@ static void ITransformWHT(const int16_t* in, int16_t* out) {
}
static void FTransformWHT(const int16_t* in, int16_t* out) {
int tmp[16];
// input is 12b signed
int16_t tmp[16];
int i;
for (i = 0; i < 4; ++i, in += 64) {
const int a0 = (in[0 * 16] + in[2 * 16]) << 2;
const int a1 = (in[1 * 16] + in[3 * 16]) << 2;
const int a2 = (in[1 * 16] - in[3 * 16]) << 2;
const int a3 = (in[0 * 16] - in[2 * 16]) << 2;
tmp[0 + i * 4] = (a0 + a1) + (a0 != 0);
const int a0 = (in[0 * 16] + in[2 * 16]); // 13b
const int a1 = (in[1 * 16] + in[3 * 16]);
const int a2 = (in[1 * 16] - in[3 * 16]);
const int a3 = (in[0 * 16] - in[2 * 16]);
tmp[0 + i * 4] = a0 + a1; // 14b
tmp[1 + i * 4] = a3 + a2;
tmp[2 + i * 4] = a3 - a2;
tmp[3 + i * 4] = a0 - a1;
}
for (i = 0; i < 4; ++i) {
const int a0 = (tmp[0 + i] + tmp[8 + i]);
const int a0 = (tmp[0 + i] + tmp[8 + i]); // 15b
const int a1 = (tmp[4 + i] + tmp[12+ i]);
const int a2 = (tmp[4 + i] - tmp[12+ i]);
const int a3 = (tmp[0 + i] - tmp[8 + i]);
const int b0 = a0 + a1;
const int b0 = a0 + a1; // 16b
const int b1 = a3 + a2;
const int b2 = a3 - a2;
const int b3 = a0 - a1;
out[ 0 + i] = (b0 + (b0 > 0) + 3) >> 3;
out[ 4 + i] = (b1 + (b1 > 0) + 3) >> 3;
out[ 8 + i] = (b2 + (b2 > 0) + 3) >> 3;
out[12 + i] = (b3 + (b3 > 0) + 3) >> 3;
out[ 0 + i] = b0 >> 1; // 15b
out[ 4 + i] = b1 >> 1;
out[ 8 + i] = b2 >> 1;
out[12 + i] = b3 >> 1;
}
}

42
src/dsp/enc_neon.c
View File

@ -363,19 +363,12 @@ static void FTransformWHT(const int16_t* in, int16_t* out) {
"vld1.16 d2[3], [%[in]], %[kStep] \n"
"vld1.16 d3[3], [%[in]], %[kStep] \n"
"vaddl.s16 q2, d0, d2 \n"
"vshl.s32 q2, q2, #2 \n" // a0=(in[0*16]+in[2*16])<<2
"vaddl.s16 q3, d1, d3 \n"
"vshl.s32 q3, q3, #2 \n" // a1=(in[1*16]+in[3*16])<<2
"vsubl.s16 q4, d1, d3 \n"
"vshl.s32 q4, q4, #2 \n" // a2=(in[1*16]-in[3*16])<<2
"vsubl.s16 q5, d0, d2 \n"
"vshl.s32 q5, q5, #2 \n" // a3=(in[0*16]-in[2*16])<<2
"vaddl.s16 q2, d0, d2 \n" // a0=(in[0*16]+in[2*16])
"vaddl.s16 q3, d1, d3 \n" // a1=(in[1*16]+in[3*16])
"vsubl.s16 q4, d1, d3 \n" // a2=(in[1*16]-in[3*16])
"vsubl.s16 q5, d0, d2 \n" // a3=(in[0*16]-in[2*16])
"vceq.s32 q10, q2, #0 \n"
"vmvn.s32 q10, q10 \n" // (a0 != 0)
"vqadd.s32 q6, q2, q3 \n" // (a0 + a1)
"vqsub.s32 q6, q6, q10 \n" // (a0 + a1) + (a0 != 0)
"vqadd.s32 q6, q2, q3 \n" // a0 + a1
"vqadd.s32 q7, q5, q4 \n" // a3 + a2
"vqsub.s32 q8, q5, q4 \n" // a3 - a2
"vqsub.s32 q9, q2, q3 \n" // a0 - a1
@ -398,27 +391,10 @@ static void FTransformWHT(const int16_t* in, int16_t* out) {
"vqsub.s32 q6, q3, q2 \n" // b2 = a3 - a2
"vqsub.s32 q7, q0, q1 \n" // b3 = a0 - a1
"vmov.s32 q0, #3 \n" // q0 = 3
"vcgt.s32 q1, q4, #0 \n" // (b0>0)
"vqsub.s32 q2, q4, q1 \n" // (b0+(b0>0))
"vqadd.s32 q3, q2, q0 \n" // (b0+(b0>0)+3)
"vshrn.s32 d18, q3, #3 \n" // (b0+(b0>0)+3) >> 3
"vcgt.s32 q1, q5, #0 \n" // (b1>0)
"vqsub.s32 q2, q5, q1 \n" // (b1+(b1>0))
"vqadd.s32 q3, q2, q0 \n" // (b1+(b1>0)+3)
"vshrn.s32 d19, q3, #3 \n" // (b1+(b1>0)+3) >> 3
"vcgt.s32 q1, q6, #0 \n" // (b2>0)
"vqsub.s32 q2, q6, q1 \n" // (b2+(b2>0))
"vqadd.s32 q3, q2, q0 \n" // (b2+(b2>0)+3)
"vshrn.s32 d20, q3, #3 \n" // (b2+(b2>0)+3) >> 3
"vcgt.s32 q1, q7, #0 \n" // (b3>0)
"vqsub.s32 q2, q7, q1 \n" // (b3+(b3>0))
"vqadd.s32 q3, q2, q0 \n" // (b3+(b3>0)+3)
"vshrn.s32 d21, q3, #3 \n" // (b3+(b3>0)+3) >> 3
"vshrn.s32 d18, q4, #1 \n" // b0 >> 1
"vshrn.s32 d19, q5, #1 \n" // b1 >> 1
"vshrn.s32 d20, q6, #1 \n" // b2 >> 1
"vshrn.s32 d21, q7, #1 \n" // b3 >> 1
"vst1.16 {q9, q10}, [%[out]] \n"

34
src/dsp/enc_sse2.c
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@ -453,6 +453,39 @@ static void FTransformSSE2(const uint8_t* src, const uint8_t* ref,
}
}
static void FTransformWHTSSE2(const int16_t* in, int16_t* out) {
int16_t tmp[16];
int i;
for (i = 0; i < 4; ++i, in += 64) {
const int a0 = (in[0 * 16] + in[2 * 16]);
const int a1 = (in[1 * 16] + in[3 * 16]);
const int a2 = (in[1 * 16] - in[3 * 16]);
const int a3 = (in[0 * 16] - in[2 * 16]);
tmp[0 + i * 4] = a0 + a1;
tmp[1 + i * 4] = a3 + a2;
tmp[2 + i * 4] = a3 - a2;
tmp[3 + i * 4] = a0 - a1;
}
{
const __m128i src0 = _mm_loadl_epi64((__m128i*)&tmp[0]);
const __m128i src1 = _mm_loadl_epi64((__m128i*)&tmp[4]);
const __m128i src2 = _mm_loadl_epi64((__m128i*)&tmp[8]);
const __m128i src3 = _mm_loadl_epi64((__m128i*)&tmp[12]);
const __m128i a0 = _mm_add_epi16(src0, src2);
const __m128i a1 = _mm_add_epi16(src1, src3);
const __m128i a2 = _mm_sub_epi16(src1, src3);
const __m128i a3 = _mm_sub_epi16(src0, src2);
const __m128i b0 = _mm_srai_epi16(_mm_adds_epi16(a0, a1), 1);
const __m128i b1 = _mm_srai_epi16(_mm_adds_epi16(a3, a2), 1);
const __m128i b2 = _mm_srai_epi16(_mm_subs_epi16(a3, a2), 1);
const __m128i b3 = _mm_srai_epi16(_mm_subs_epi16(a0, a1), 1);
_mm_storel_epi64((__m128i*)&out[ 0], b0);
_mm_storel_epi64((__m128i*)&out[ 4], b1);
_mm_storel_epi64((__m128i*)&out[ 8], b2);
_mm_storel_epi64((__m128i*)&out[12], b3);
}
}
//------------------------------------------------------------------------------
// Metric
@ -919,6 +952,7 @@ void VP8EncDspInitSSE2(void) {
VP8EncQuantizeBlock = QuantizeBlockSSE2;
VP8ITransform = ITransformSSE2;
VP8FTransform = FTransformSSE2;
VP8FTransformWHT = FTransformWHTSSE2;
VP8SSE16x16 = SSE16x16SSE2;
VP8SSE16x8 = SSE16x8SSE2;
VP8SSE8x8 = SSE8x8SSE2;