simd/pf_neon_float.h

/* Copyright (c) 2013  Julien Pommier ( pommier@modartt.com )

   Redistribution and use of the Software in source and binary forms,
   with or without modification, is permitted provided that the
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   - Neither the names of NCAR's Computational and Information Systems
   Laboratory, the University Corporation for Atmospheric Research,
   nor the names of its sponsors or contributors may be used to
   endorse or promote products derived from this Software without
   specific prior written permission.

   - Redistributions of source code must retain the above copyright
   notices, this list of conditions, and the disclaimer below.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions, and the disclaimer below in the
   documentation and/or other materials provided with the
   distribution.

   THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO THE WARRANTIES OF
   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   NONINFRINGEMENT. IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT
   HOLDERS BE LIABLE FOR ANY CLAIM, INDIRECT, INCIDENTAL, SPECIAL,
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*/

#ifndef PF_NEON_FLT_H
#define PF_NEON_FLT_H

/*
  ARM NEON support macros
*/
#if !defined(PFFFT_SIMD_DISABLE) && defined(PFFFT_ENABLE_NEON) && (defined(__arm__) || defined(__aarch64__) || defined(__arm64__))
#pragma message( __FILE__ ": ARM NEON macros are defined" )

#  include <arm_neon.h>
typedef float32x4_t v4sf;

#  define SIMD_SZ 4

typedef union v4sf_union {
  v4sf  v;
  float f[SIMD_SZ];
} v4sf_union;

#  define VARCH "NEON"
#  define VREQUIRES_ALIGN 0  /* usually no alignment required */
#  define VZERO() vdupq_n_f32(0)
#  define VMUL(a,b) vmulq_f32(a,b)
#  define VADD(a,b) vaddq_f32(a,b)
#  define VMADD(a,b,c) vmlaq_f32(c,a,b)
#  define VSUB(a,b) vsubq_f32(a,b)
#  define LD_PS1(p) vld1q_dup_f32(&(p))
#  define VLOAD_UNALIGNED(ptr)  (*((v4sf*)(ptr)))
#  define VLOAD_ALIGNED(ptr)    (*((v4sf*)(ptr)))
#  define INTERLEAVE2(in1, in2, out1, out2) { float32x4x2_t tmp__ = vzipq_f32(in1,in2); out1=tmp__.val[0]; out2=tmp__.val[1]; }
#  define UNINTERLEAVE2(in1, in2, out1, out2) { float32x4x2_t tmp__ = vuzpq_f32(in1,in2); out1=tmp__.val[0]; out2=tmp__.val[1]; }
#  define VTRANSPOSE4(x0,x1,x2,x3) {                                    \
    float32x4x2_t t0_ = vzipq_f32(x0, x2);                              \
    float32x4x2_t t1_ = vzipq_f32(x1, x3);                              \
    float32x4x2_t u0_ = vzipq_f32(t0_.val[0], t1_.val[0]);              \
    float32x4x2_t u1_ = vzipq_f32(t0_.val[1], t1_.val[1]);              \
    x0 = u0_.val[0]; x1 = u0_.val[1]; x2 = u1_.val[0]; x3 = u1_.val[1]; \
  }
// marginally faster version
//#  define VTRANSPOSE4(x0,x1,x2,x3) { asm("vtrn.32 %q0, %q1;\n vtrn.32 %q2,%q3\n vswp %f0,%e2\n vswp %f1,%e3" : "+w"(x0), "+w"(x1), "+w"(x2), "+w"(x3)::); }
#  define VSWAPHL(a,b) vcombine_f32(vget_low_f32(b), vget_high_f32(a))

/* reverse/flip all floats */
#  define VREV_S(a)    vcombine_f32(vrev64_f32(vget_high_f32(a)), vrev64_f32(vget_low_f32(a)))
/* reverse/flip complex floats */
#  define VREV_C(a)    vextq_f32(a, a, 2)

#  define VALIGNED(ptr) ((((uintptr_t)(ptr)) & 0x3) == 0)

#else
/* #pragma message( __FILE__ ": ARM NEON macros are not defined" ) */
#endif

#endif /* PF_NEON_FLT_H */