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srsLTE
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Avoid cexpf in srsran_vec_apply_cfo_simd

This commit is contained in:
Xavier Arteaga 2021-05-07 11:40:41 +02:00 committed by Xavier Arteaga
parent 96ab16f1c7
commit 2f9c7e1345
1 changed files with 14 additions and 10 deletions
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24
lib/src/phy/utils/vector_simd.c
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@ -1684,21 +1684,21 @@ void srsran_vec_apply_cfo_simd(const cf_t* x, float cfo, cf_t* z, int len)
{
const float TWOPI = 2.0f * (float)M_PI;
int i = 0;
cf_t osc = cexpf(_Complex_I * TWOPI * cfo);
cf_t phase = 1.0f;
#if SRSRAN_SIMD_CF_SIZE
srsran_simd_aligned cf_t _osc[SRSRAN_SIMD_CF_SIZE];
// Load initial phases and oscillator
srsran_simd_aligned cf_t _phase[SRSRAN_SIMD_CF_SIZE];
if (i < len - SRSRAN_SIMD_CF_SIZE + 1) {
for (int k = 0; k < SRSRAN_SIMD_CF_SIZE; k++) {
_osc[k] = cexpf(_Complex_I * TWOPI * cfo * SRSRAN_SIMD_CF_SIZE);
_phase[k] = cexpf(_Complex_I * TWOPI * cfo * k);
}
_phase[0] = phase;
for (int k = 1; k < SRSRAN_SIMD_CF_SIZE; k++) {
_phase[k] = _phase[k - 1] * osc;
}
simd_cf_t _simd_osc = srsran_simd_cfi_load(_osc);
simd_cf_t _simd_osc = srsran_simd_cf_set1(_phase[SRSRAN_SIMD_CF_SIZE - 1] * osc);
simd_cf_t _simd_phase = srsran_simd_cfi_load(_phase);
if (SRSRAN_IS_ALIGNED(x) && SRSRAN_IS_ALIGNED(z)) {
// For aligned memory
for (; i < len - SRSRAN_SIMD_CF_SIZE + 1; i += SRSRAN_SIMD_CF_SIZE) {
simd_cf_t a = srsran_simd_cfi_load(&x[i]);
@ -1709,6 +1709,7 @@ void srsran_vec_apply_cfo_simd(const cf_t* x, float cfo, cf_t* z, int len)
_simd_phase = srsran_simd_cf_prod(_simd_phase, _simd_osc);
}
} else {
// For unaligned memory
for (; i < len - SRSRAN_SIMD_F_SIZE + 1; i += SRSRAN_SIMD_F_SIZE) {
simd_cf_t a = srsran_simd_cfi_loadu(&x[i]);
@ -1719,9 +1720,12 @@ void srsran_vec_apply_cfo_simd(const cf_t* x, float cfo, cf_t* z, int len)
_simd_phase = srsran_simd_cf_prod(_simd_phase, _simd_osc);
}
}
// Stores the next phase
srsran_simd_cfi_store(_phase, _simd_phase);
phase = _phase[0];
#endif
cf_t osc = cexpf(_Complex_I * TWOPI * cfo);
cf_t phase = cexpf(_Complex_I * TWOPI * cfo * i);
for (; i < len; i++) {
z[i] = x[i] * phase;