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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-lib
* Created on: 31 мар. 2020 г.
*
* lsp-dsp-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-dsp-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-dsp-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PRIVATE_DSP_ARCH_ARM_NEON_D32_FFT_NORMALIZE_H_
#define PRIVATE_DSP_ARCH_ARM_NEON_D32_FFT_NORMALIZE_H_
#ifndef PRIVATE_DSP_ARCH_ARM_NEON_D32_IMPL
#error "This header should not be included directly"
#endif /* PRIVATE_DSP_ARCH_ARM_NEON_D32_IMPL */
namespace lsp
{
namespace neon_d32
{
void normalize_fft3(float *dre, float *dim, const float *re, const float *im, size_t rank)
{
IF_ARCH_ARM(
float k = 1.0f/(1 << rank);
size_t count = 1 << rank;
);
ARCH_ARM_ASM(
// x8 blocks
__ASM_EMIT("vdup.32 q0, %y[k]") // q0 = k
__ASM_EMIT("subs %[count], %[count], #8")
__ASM_EMIT("vmov q1, q0")
__ASM_EMIT("blt 2f")
__ASM_EMIT("1:")
__ASM_EMIT("vldm %[s_re]!, {q4-q5}")
__ASM_EMIT("vldm %[s_im]!, {q6-q7}")
__ASM_EMIT("vmul.f32 q4, q4, q0")
__ASM_EMIT("vmul.f32 q5, q5, q1")
__ASM_EMIT("vmul.f32 q6, q6, q0")
__ASM_EMIT("vmul.f32 q7, q7, q1")
__ASM_EMIT("subs %[count], %[count], #8")
__ASM_EMIT("vstm %[d_re]!, {q4-q5}")
__ASM_EMIT("vstm %[d_im]!, {q6-q7}")
__ASM_EMIT("bhs 1b")
__ASM_EMIT("2:")
: [s_re] "+r" (re), [s_im] "+r" (im),
[d_re] "+r" (dre), [d_im] "+r" (dim),
[k] "+t" (k), [count] "+r" (count)
:
: "cc", "memory",
"q0", "q1",
"q4", "q5", "q6", "q7"
);
}
void normalize_fft2(float *re, float *im, size_t rank)
{
IF_ARCH_ARM(
float k = 1.0f/(1 << rank);
size_t count = 1 << rank;
);
ARCH_ARM_ASM(
// x8 blocks
__ASM_EMIT("vdup.32 q0, %y[k]") // q0 = k
__ASM_EMIT("subs %[count], %[count], #8")
__ASM_EMIT("vmov q1, q0")
__ASM_EMIT("blt 2f")
__ASM_EMIT("1:")
__ASM_EMIT("vldm %[d_re], {q4-q5}")
__ASM_EMIT("vldm %[d_im], {q6-q7}")
__ASM_EMIT("vmul.f32 q4, q4, q0")
__ASM_EMIT("vmul.f32 q5, q5, q1")
__ASM_EMIT("vmul.f32 q6, q6, q0")
__ASM_EMIT("vmul.f32 q7, q7, q1")
__ASM_EMIT("subs %[count], %[count], #8")
__ASM_EMIT("vstm %[d_re]!, {q4-q5}")
__ASM_EMIT("vstm %[d_im]!, {q6-q7}")
__ASM_EMIT("bhs 1b")
__ASM_EMIT("2:")
: [d_re] "+r" (re), [d_im] "+r" (im),
[k] "+t" (k), [count] "+r" (count)
:
: "cc", "memory",
"q0", "q1",
"q4", "q5", "q6", "q7"
);
}
}
}
#endif /* PRIVATE_DSP_ARCH_ARM_NEON_D32_FFT_NORMALIZE_H_ */
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