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scale in DFT16 as per normal scaling sqrt(16) = 4

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Laurent THOMAS
2024-10-29 18:47:15 +01:00
committed by Robert Schmidt
parent f1f02ec0a1
commit 4cf2719bd9
1 changed files with 12 additions and 13 deletions
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openair1/PHY/TOOLS/oai_dfts.c
+12 -13
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@@ -1268,17 +1268,16 @@ __attribute__((always_inline)) static inline void dft16_simd256(int16_t *x, int1
x02t = simde_mm256_adds_epi16(xtmp0,xtmp2);
x13t = simde_mm256_adds_epi16(xtmp1,xtmp3);
ytmp0 = simde_mm256_adds_epi16(x02t,x13t);
ytmp2 = simde_mm256_subs_epi16(x02t,x13t);
ytmp0 = simde_mm256_srai_epi16(simde_mm256_adds_epi16(x02t, x13t), 2);
ytmp2 = simde_mm256_srai_epi16(simde_mm256_subs_epi16(x02t, x13t), 2);
x1_flip = simde_mm256_sign_epi16(xtmp1, *(simde__m256i *)conjugatedft);
x1_flip = simde_mm256_shuffle_epi8(x1_flip,complex_shuffle);
x3_flip = simde_mm256_sign_epi16(xtmp3, *(simde__m256i *)conjugatedft);
x3_flip = simde_mm256_shuffle_epi8(x3_flip,complex_shuffle);
x02t = simde_mm256_subs_epi16(xtmp0,xtmp2);
x13t = simde_mm256_subs_epi16(x1_flip,x3_flip);
ytmp1 = simde_mm256_adds_epi16(x02t,x13t); // x0 + x1f - x2 - x3f
ytmp3 = simde_mm256_subs_epi16(x02t,x13t); // x0 - x1f - x2 + x3f
ytmp1 = simde_mm256_srai_epi16(simde_mm256_adds_epi16(x02t, x13t), 2); // x0 + x1f - x2 - x3f
ytmp3 = simde_mm256_srai_epi16(simde_mm256_subs_epi16(x02t, x13t), 2); // x0 - x1f - x2 + x3f
// [y0 y1 y2 y3 y16 y17 y18 y19]
// [y4 y5 y6 y7 y20 y21 y22 y23]
@@ -1652,14 +1651,14 @@ void dft64(int16_t *x,int16_t *y,unsigned char scale)
if (scale>0) {
y256[0] = shiftright_int16_simd256(y256[0],3);
y256[1] = shiftright_int16_simd256(y256[1],3);
y256[2] = shiftright_int16_simd256(y256[2],3);
y256[3] = shiftright_int16_simd256(y256[3],3);
y256[4] = shiftright_int16_simd256(y256[4],3);
y256[5] = shiftright_int16_simd256(y256[5],3);
y256[6] = shiftright_int16_simd256(y256[6],3);
y256[7] = shiftright_int16_simd256(y256[7],3);
y256[0] = shiftright_int16_simd256(y256[0], 1);
y256[1] = shiftright_int16_simd256(y256[1], 1);
y256[2] = shiftright_int16_simd256(y256[2], 1);
y256[3] = shiftright_int16_simd256(y256[3], 1);
y256[4] = shiftright_int16_simd256(y256[4], 1);
y256[5] = shiftright_int16_simd256(y256[5], 1);
y256[6] = shiftright_int16_simd256(y256[6], 1);
y256[7] = shiftright_int16_simd256(y256[7], 1);
}
simde_mm_empty();