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// Auto-generated file. Do not edit!
// Template: src/cs16-bfly4/scalar.c.in
// Generator: tools/xngen
//
// Copyright 2022 Google LLC
//
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree.
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <xnnpack/math.h>
#include <xnnpack/fft.h>
void xnn_cs16_bfly4_ukernel__scalar_x1(
size_t batch,
size_t samples,
int16_t* data,
const int16_t* twiddle,
size_t stride)
{
assert(batch != 0);
assert(samples != 0);
assert(samples % (sizeof(int16_t) * 2) == 0);
assert(data != NULL);
assert(stride != 0);
assert(twiddle != NULL);
int16_t* data3 = data;
do {
int16_t* data0 = data3;
int16_t* data1 = (int16_t*) ((uintptr_t) data0 + samples);
int16_t* data2 = (int16_t*) ((uintptr_t) data1 + samples);
data3 = (int16_t*) ((uintptr_t) data2 + samples);
const int16_t* tw1 = twiddle;
const int16_t* tw2 = twiddle;
const int16_t* tw3 = twiddle;
tw1 = (const int16_t*) ((uintptr_t) tw1 + stride);
tw2 = (const int16_t*) ((uintptr_t) tw2 + stride * 2);
tw3 = (const int16_t*) ((uintptr_t) tw3 + stride * 3);
size_t s = samples - sizeof(int16_t) * 2;
// First sample skips twiddle.
// Same code as samples=1 but supports stride
{
int32_t vout0r = (int32_t) data0[0];
int32_t vout0i = (int32_t) data0[1];
int32_t vout1r = (int32_t) data1[0];
int32_t vout1i = (int32_t) data1[1];
int32_t vout2r = (int32_t) data2[0];
int32_t vout2i = (int32_t) data2[1];
int32_t vout3r = (int32_t) data3[0];
int32_t vout3i = (int32_t) data3[1];
// Note 32767 / 4 = 8191. Should be 8192.
vout0r = math_asr_s32(vout0r * 8191 + 16384, 15);
vout0i = math_asr_s32(vout0i * 8191 + 16384, 15);
vout1r = math_asr_s32(vout1r * 8191 + 16384, 15);
vout1i = math_asr_s32(vout1i * 8191 + 16384, 15);
vout2r = math_asr_s32(vout2r * 8191 + 16384, 15);
vout2i = math_asr_s32(vout2i * 8191 + 16384, 15);
vout3r = math_asr_s32(vout3r * 8191 + 16384, 15);
vout3i = math_asr_s32(vout3i * 8191 + 16384, 15);
const int32_t vtmp5r = vout0r - vout2r;
const int32_t vtmp5i = vout0i - vout2i;
vout0r += vout2r;
vout0i += vout2i;
const int32_t vtmp3r = vout1r + vout3r;
const int32_t vtmp3i = vout1i + vout3i;
const int32_t vtmp4r = vout1i - vout3i;
const int32_t vtmp4i = -(vout1r - vout3r); // swap r,i and neg i
vout2r = vout0r - vtmp3r;
vout2i = vout0i - vtmp3i;
vout0r += vtmp3r;
vout0i += vtmp3i;
vout1r = vtmp5r + vtmp4r;
vout1i = vtmp5i + vtmp4i;
vout3r = vtmp5r - vtmp4r;
vout3i = vtmp5i - vtmp4i;
data0[0] = (int16_t) vout0r;
data0[1] = (int16_t) vout0i;
data1[0] = (int16_t) vout1r;
data1[1] = (int16_t) vout1i;
data2[0] = (int16_t) vout2r;
data2[1] = (int16_t) vout2i;
data3[0] = (int16_t) vout3r;
data3[1] = (int16_t) vout3i;
data0 += 2;
data1 += 2;
data2 += 2;
data3 += 2;
}
if XNN_UNLIKELY(s != 0) {
do {
int32_t vout0r = (int32_t) data0[0];
int32_t vout0i = (int32_t) data0[1];
int32_t vout1r = (int32_t) data1[0];
int32_t vout1i = (int32_t) data1[1];
int32_t vout2r = (int32_t) data2[0];
int32_t vout2i = (int32_t) data2[1];
int32_t vout3r = (int32_t) data3[0];
int32_t vout3i = (int32_t) data3[1];
const int32_t vtw1r = (const int32_t) tw1[0];
const int32_t vtw1i = (const int32_t) tw1[1];
const int32_t vtw2r = (const int32_t) tw2[0];
const int32_t vtw2i = (const int32_t) tw2[1];
const int32_t vtw3r = (const int32_t) tw3[0];
const int32_t vtw3i = (const int32_t) tw3[1];
tw1 = (const int16_t*) ((uintptr_t) tw1 + stride);
tw2 = (const int16_t*) ((uintptr_t) tw2 + stride * 2);
tw3 = (const int16_t*) ((uintptr_t) tw3 + stride * 3);
// Note 32767 / 4 = 8191. Should be 8192.
vout0r = math_asr_s32(vout0r * 8191 + 16384, 15);
vout0i = math_asr_s32(vout0i * 8191 + 16384, 15);
vout1r = math_asr_s32(vout1r * 8191 + 16384, 15);
vout1i = math_asr_s32(vout1i * 8191 + 16384, 15);
vout2r = math_asr_s32(vout2r * 8191 + 16384, 15);
vout2i = math_asr_s32(vout2i * 8191 + 16384, 15);
vout3r = math_asr_s32(vout3r * 8191 + 16384, 15);
vout3i = math_asr_s32(vout3i * 8191 + 16384, 15);
const int32_t vtmp0r = math_asr_s32(vout1r * vtw1r - vout1i * vtw1i + 16384, 15);
const int32_t vtmp0i = math_asr_s32(vout1r * vtw1i + vout1i * vtw1r + 16384, 15);
const int32_t vtmp1r = math_asr_s32(vout2r * vtw2r - vout2i * vtw2i + 16384, 15);
const int32_t vtmp1i = math_asr_s32(vout2r * vtw2i + vout2i * vtw2r + 16384, 15);
const int32_t vtmp2r = math_asr_s32(vout3r * vtw3r - vout3i * vtw3i + 16384, 15);
const int32_t vtmp2i = math_asr_s32(vout3r * vtw3i + vout3i * vtw3r + 16384, 15);
const int32_t vtmp5r = vout0r - vtmp1r;
const int32_t vtmp5i = vout0i - vtmp1i;
vout0r += vtmp1r;
vout0i += vtmp1i;
const int32_t vtmp3r = vtmp0r + vtmp2r;
const int32_t vtmp3i = vtmp0i + vtmp2i;
const int32_t vtmp4r = vtmp0i - vtmp2i;
const int32_t vtmp4i = -(vtmp0r - vtmp2r); // swap r,i and neg i
vout2r = vout0r - vtmp3r;
vout2i = vout0i - vtmp3i;
vout0r += vtmp3r;
vout0i += vtmp3i;
vout1r = vtmp5r + vtmp4r;
vout1i = vtmp5i + vtmp4i;
vout3r = vtmp5r - vtmp4r;
vout3i = vtmp5i - vtmp4i;
data0[0] = (int16_t) vout0r;
data0[1] = (int16_t) vout0i;
data1[0] = (int16_t) vout1r;
data1[1] = (int16_t) vout1i;
data2[0] = (int16_t) vout2r;
data2[1] = (int16_t) vout2i;
data3[0] = (int16_t) vout3r;
data3[1] = (int16_t) vout3i;
data0 += 2;
data1 += 2;
data2 += 2;
data3 += 2;
s -= sizeof(int16_t) * 2;
} while (s != 0);
}
} while (--batch != 0);
}
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