walkero
/
openjpeg
1
0
Fork 0
Code Issues Pull Requests Projects Releases 1 Wiki Activity

opj_v4dwt_decode_step1_sse(): rework a bit to improve code generation

This commit is contained in:
Even Rouault 2017-09-01 22:09:58 +02:00
parent 676d4c807f
commit c1e0fba0c4
1 changed files with 12 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
src/lib/openjp2/dwt.c
View File

@ -2274,14 +2274,19 @@ static void opj_v4dwt_decode_step1_sse(opj_v4_t* w,
__m128* OPJ_RESTRICT vw = (__m128*) w;
OPJ_UINT32 i;
/* 4x unrolled loop */
for (i = start; i + 3 < end; i += 4) {
vw[2 * i] = _mm_mul_ps(vw[2 * i], c);
vw[2 * i + 2] = _mm_mul_ps(vw[2 * i + 2], c);
vw[2 * i + 4] = _mm_mul_ps(vw[2 * i + 4], c);
vw[2 * i + 6] = _mm_mul_ps(vw[2 * i + 6], c);
vw += 2 * start;
for (i = start; i + 3 < end; i += 4, vw += 8) {
__m128 xmm0 = _mm_mul_ps(vw[0], c);
__m128 xmm2 = _mm_mul_ps(vw[2], c);
__m128 xmm4 = _mm_mul_ps(vw[4], c);
__m128 xmm6 = _mm_mul_ps(vw[6], c);
vw[0] = xmm0;
vw[2] = xmm2;
vw[4] = xmm4;
vw[6] = xmm6;
}
for (; i < end; ++i) {
vw[2 * i] = _mm_mul_ps(vw[2 * i], c);
for (; i < end; ++i, vw += 2) {
vw[0] = _mm_mul_ps(vw[0], c);
}
}