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// Auto-generated file. Do not edit!
// Template: src/cs16-fftr/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_fftr_ukernel__scalar_x1(
size_t samples,
int16_t* data,
const int16_t* twiddle)
{
assert(samples != 0);
assert(samples % 2 == 0);
assert(data != NULL);
assert(twiddle != NULL);
int16_t* dl = data;
int16_t* dr = data + samples * 2;
int32_t vdcr = (int32_t) dl[0];
int32_t vdci = (int32_t) dl[1];
vdcr = math_asr_s32(vdcr * 16383 + 16384, 15);
vdci = math_asr_s32(vdci * 16383 + 16384, 15);
dl[0] = vdcr + vdci;
dl[1] = 0;
dl += 2;
dr[0] = vdcr - vdci;
dr[1] = 0;
samples >>= 1;
if XNN_UNLIKELY(samples != 0) {
do {
dr -= 2;
int32_t vilr = (int32_t) dl[0];
int32_t vili = (int32_t) dl[1];
int32_t virr = (int32_t) dr[0];
int32_t viri = (int32_t) dr[1];
const int32_t vtwr = twiddle[0];
const int32_t vtwi = twiddle[1];
twiddle += 2;
vilr = math_asr_s32(vilr * 16383 + 16384, 15);
vili = math_asr_s32(vili * 16383 + 16384, 15);
virr = math_asr_s32(virr * 16383 + 16384, 15);
viri = math_asr_s32(viri * 16383 + 16384, 15);
const int32_t vacc1r = vilr + virr;
const int32_t vacc1i = vili - viri;
const int32_t vacc2r = vilr - virr;
const int32_t vacc2i = vili + viri;
const int32_t vaccr = math_asr_s32(vacc2r * vtwr - vacc2i * vtwi + 16384, 15);
const int32_t vacci = math_asr_s32(vacc2r * vtwi + vacc2i * vtwr + 16384, 15);
dl[0] = math_asr_s32(vacc1r + vaccr, 1);
dl[1] = math_asr_s32(vacc1i + vacci, 1);
dr[0] = math_asr_s32(vacc1r - vaccr, 1);
dr[1] = math_asr_s32(vacci - vacc1i, 1);
dl += 2;
} while (--samples != 0);
}
}
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