fdk-aac/libFDK/include/arm/cplx_mul_arm.h

/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
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 1.    INTRODUCTION
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
scheme for digital audio. This FDK AAC Codec software is intended to be used on
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
general perceptual audio codecs. AAC-ELD is considered the best-performing
full-bandwidth communications codec by independent studies and is widely
deployed. AAC has been standardized by ISO and IEC as part of the MPEG
specifications.

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Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
91058 Erlangen, Germany

www.iis.fraunhofer.de/amm
amm-info@iis.fraunhofer.de
----------------------------------------------------------------------------- */

/******************* Library for basic calculation routines ********************

   Author(s):

   Description: fixed point intrinsics

*******************************************************************************/

#if !defined(CPLX_MUL_ARM_H)
#define CPLX_MUL_ARM_H

#if defined(__arm__) && defined(__GNUC__)

#if defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_6__) || \
    defined(__ARM_ARCH_8__)
#define FUNCTION_cplxMultDiv2_32x16
#define FUNCTION_cplxMultDiv2_32x16X2
#endif

#define FUNCTION_cplxMultDiv2_32x32X2
#ifdef FUNCTION_cplxMultDiv2_32x32X2
inline void cplxMultDiv2(FIXP_DBL *c_Re, FIXP_DBL *c_Im, const FIXP_DBL a_Re,
                         const FIXP_DBL a_Im, const FIXP_DBL b_Re,
                         const FIXP_DBL b_Im) {
  LONG tmp1, tmp2;

#ifdef __ARM_ARCH_8__
  asm("smull  %x0, %w2, %w4;       \n" /* tmp1  = a_Re * b_Re */
      "smull  %x1, %w2, %w5;       \n" /* tmp2  = a_Re * b_Im */
      "smsubl %x0, %w3, %w5, %x0;  \n" /* tmp1 -= a_Im * b_Im */
      "smaddl %x1, %w3, %w4, %x1;  \n" /* tmp2 += a_Im * b_Re */
      "asr    %x0, %x0,  #32       \n"
      "asr    %x1, %x1,  #32       \n"
      : "=&r"(tmp1), "=&r"(tmp2)
      : "r"(a_Re), "r"(a_Im), "r"(b_Re), "r"(b_Im));
#elif defined(__ARM_ARCH_6__)
  asm("smmul %0, %2, %4;\n"     /* tmp1  = a_Re * b_Re */
      "smmls %0, %3, %5, %0;\n" /* tmp1 -= a_Im * b_Im */
      "smmul %1, %2, %5;\n"     /* tmp2  = a_Re * b_Im */
      "smmla %1, %3, %4, %1;\n" /* tmp2 += a_Im * b_Re */
      : "=&r"(tmp1), "=&r"(tmp2)
      : "r"(a_Re), "r"(a_Im), "r"(b_Re), "r"(b_Im));
#else
  LONG discard;
  asm("smull %2, %0, %7, %6;\n" /* tmp1  = -a_Im * b_Im */
      "smlal %2, %0, %3, %5;\n" /* tmp1 +=  a_Re * b_Re */
      "smull %2, %1, %3, %6;\n" /* tmp2  =  a_Re * b_Im */
      "smlal %2, %1, %4, %5;\n" /* tmp2 +=  a_Im * b_Re */
      : "=&r"(tmp1), "=&r"(tmp2), "=&r"(discard)
      : "r"(a_Re), "r"(a_Im), "r"(b_Re), "r"(b_Im), "r"(-a_Im));
#endif
  *c_Re = tmp1;
  *c_Im = tmp2;
}
#endif /* FUNCTION_cplxMultDiv2_32x32X2 */

#if defined(FUNCTION_cplxMultDiv2_32x16)
inline void cplxMultDiv2(FIXP_DBL *c_Re, FIXP_DBL *c_Im, const FIXP_DBL a_Re,
                         const FIXP_DBL a_Im, FIXP_SPK wpk) {
#ifdef __ARM_ARCH_8__
  FIXP_DBL b_Im = FX_SGL2FX_DBL(wpk.v.im);
  FIXP_DBL b_Re = FX_SGL2FX_DBL(wpk.v.re);
  cplxMultDiv2(c_Re, c_Im, a_Re, a_Im, b_Re, b_Im);
#else
  LONG tmp1, tmp2;
  const LONG w = wpk.w;
  asm("smulwt %0, %3, %4;\n"
      "rsb %1,%0,#0;\n"
      "smlawb %0, %2, %4, %1;\n"
      "smulwt %1, %2, %4;\n"
      "smlawb %1, %3, %4, %1;\n"
      : "=&r"(tmp1), "=&r"(tmp2)
      : "r"(a_Re), "r"(a_Im), "r"(w));
  *c_Re = tmp1;
  *c_Im = tmp2;
#endif
}
#endif /* FUNCTION_cplxMultDiv2_32x16 */

#ifdef FUNCTION_cplxMultDiv2_32x16X2
inline void cplxMultDiv2(FIXP_DBL *c_Re, FIXP_DBL *c_Im, const FIXP_DBL a_Re,
                         const FIXP_DBL a_Im, const FIXP_SGL b_Re,
                         const FIXP_SGL b_Im) {
#ifdef __ARM_ARCH_8__
  FIXP_DBL b_re = FX_SGL2FX_DBL(b_Re);
  FIXP_DBL b_im = FX_SGL2FX_DBL(b_Im);
  cplxMultDiv2(c_Re, c_Im, a_Re, a_Im, b_re, b_im);
#else
  LONG tmp1, tmp2;

  asm("smulwb %0, %3, %5;\n" /* %7   = -a_Im * b_Im */
      "rsb %1,%0,#0;\n"
      "smlawb %0, %2, %4, %1;\n" /* tmp1 =  a_Re * b_Re - a_Im * b_Im */
      "smulwb %1, %2, %5;\n"     /* %7   =  a_Re * b_Im */
      "smlawb %1, %3, %4, %1;\n" /* tmp2 =  a_Im * b_Re + a_Re * b_Im */
      : "=&r"(tmp1), "=&r"(tmp2)
      : "r"(a_Re), "r"(a_Im), "r"(b_Re), "r"(b_Im));

  *c_Re = tmp1;
  *c_Im = tmp2;
#endif
}
#endif /* FUNCTION_cplxMultDiv2_32x16X2 */

#endif

#endif /* !defined(CPLX_MUL_ARM_H) */