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opj_v4dwt_decode_step2_sse(): loop unroll

This commit is contained in:
Even Rouault 2017-09-01 16:31:08 +02:00
parent 83b5a168ec
commit 8a17be8945
1 changed files with 23 additions and 1 deletions
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24
src/lib/openjp2/dwt.c
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@ -2302,7 +2302,29 @@ static void opj_v4dwt_decode_step2_sse(opj_v4_t* l, opj_v4_t* w,
vw += start * 2; vw += start * 2;
tmp1 = vw[-3]; tmp1 = vw[-3];
} }
for (i = start; i < imax; ++i) {
i = start;
/* 4x loop unrolling */
for (; i + 3 < imax; i += 4) {
__m128 tmp4, tmp5, tmp6, tmp7, tmp8, tmp9;
tmp2 = vw[-1];
tmp3 = vw[ 0];
tmp4 = vw[ 1];
tmp5 = vw[ 2];
tmp6 = vw[ 3];
tmp7 = vw[ 4];
tmp8 = vw[ 5];
tmp9 = vw[ 6];
vw[-1] = _mm_add_ps(tmp2, _mm_mul_ps(_mm_add_ps(tmp1, tmp3), c));
vw[ 1] = _mm_add_ps(tmp4, _mm_mul_ps(_mm_add_ps(tmp3, tmp5), c));
vw[ 3] = _mm_add_ps(tmp6, _mm_mul_ps(_mm_add_ps(tmp5, tmp7), c));
vw[ 5] = _mm_add_ps(tmp8, _mm_mul_ps(_mm_add_ps(tmp7, tmp9), c));
tmp1 = tmp9;
vw += 8;
}
for (; i < imax; ++i) {
tmp2 = vw[-1]; tmp2 = vw[-1];
tmp3 = vw[ 0]; tmp3 = vw[ 0];
vw[-1] = _mm_add_ps(tmp2, _mm_mul_ps(_mm_add_ps(tmp1, tmp3), c)); vw[-1] = _mm_add_ps(tmp2, _mm_mul_ps(_mm_add_ps(tmp1, tmp3), c));