libgcc/config/gcn/amdgcn_veclib.h

/* Macro library used to help during conversion of scalar math functions to
   vectorized SIMD equivalents on AMD GCN.

   Copyright (C) 2023 Free Software Foundation, Inc.
   Contributed by Siemens.
  
   This file is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 3, or (at your option) any
   later version.

   This file 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
   General Public License for more details.

   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */

typedef union {
  v2sf t_v2sf;
  v4sf t_v4sf;
  v8sf t_v8sf;
  v16sf t_v16sf;
  v32sf t_v32sf;
  v64sf t_v64sf;

  v2df t_v2df;
  v4df t_v4df;
  v8df t_v8df;
  v16df t_v16df;
  v32df t_v32df;
  v64df t_v64df;

  v64qi t_v64qi;
  v64hi t_v64hi;

  v2si t_v2si;
  v4si t_v4si;
  v8si t_v8si;
  v16si t_v16si;
  v32si t_v32si;
  v64si t_v64si;

  v64usi t_v64usi;

  v2di t_v2di;
  v4di t_v4di;
  v8di t_v8di;
  v16di t_v16di;
  v32di t_v32di;
  v64di t_v64di;
} vector_union;

/* Cast between vectors with a different number of elements, or type.  */

#define VGPR_CAST(to_t, from) \
({ \
  to_t __res; \
  __asm__ ("" : "=v"(__res) : "0"(from)); \
  __res; \
})

#define PACK_SI_PAIR(low, high) \
({ \
  v64udi __res; \
  asm ("v_mov_b32\t%L0, %1\n\t" \
       "v_mov_b32\t%H0, %2" \
       : "=&v"(__res) : "v0"(low), "v"(high), "e"(-1L)); \
  __res; \
 })

#define UNPACK_SI_LOW(to_t, pair) VGPR_CAST(to_t, pair)
#define UNPACK_SI_HIGH(to_t, pair) \
({ \
  to_t __res; \
  asm ("v_mov_b32\t%0, %H1" : "=v"(__res) : "v"(pair), "e"(-1L)); \
  __res; \
 })

#define PACK_DI_PAIR(low, high) \
({ \
  v64uti __res; \
  asm ("v_mov_b32\t%L0, %L1\n\t" \
       "v_mov_b32\t%H0, %H1\n\t" \
       "v_mov_b32\t%J0, %L2\n\t" \
       "v_mov_b32\t%K0, %H2" \
       : "=&v"(__res) : "v0"(low), "v"(high), "e"(-1L)); \
  __res; \
 })

#define UNPACK_DI_LOW(to_t, pair) VGPR_CAST(to_t, pair)
#define UNPACK_DI_HIGH(to_t, pair) \
({ \
  to_t __res; \
  asm ("v_mov_b32\t%L0, %J1\n\t" \
       "v_mov_b32\t%H0, %K1" : "=v"(__res) : "v"(pair), "e"(-1L)); \
  __res; \
 })

#define NO_COND __mask

/* Note - __mask is _not_ accounted for in VECTOR_MERGE!  */
#define VECTOR_MERGE(vec1, vec2, cond) \
({ \
  _Static_assert (__builtin_types_compatible_p (typeof (vec1), typeof (vec2))); \
  union { \
    typeof (vec1) val; \
    v64qi t_v64qi; \
    v64hi t_v64hi; \
    v64si t_v64si; \
    v64di t_v64di; \
  } __vec1, __vec2, __res; \
  __vec1.val = (vec1); \
  __vec2.val = (vec2); \
  __builtin_choose_expr ( \
        sizeof (vec1) == sizeof (v64si), \
        ({ \
          v64si __bitmask = __builtin_convertvector ((cond), v64si); \
          __res.t_v64si = (__vec1.t_v64si & __bitmask) \
                          | (__vec2.t_v64si & ~__bitmask); \
        }), \
	__builtin_choose_expr ( \
	  sizeof (vec1) == sizeof (v64hi), \
	  ({ \
	    v64hi __bitmask = __builtin_convertvector ((cond), v64hi); \
	    __res.t_v64hi = (__vec1.t_v64hi & __bitmask) \
			    | (__vec2.t_v64hi & ~__bitmask); \
	   }), \
	   __builtin_choose_expr ( \
	     sizeof (vec1) == sizeof (v64qi), \
	     ({ \
	     v64qi __bitmask = __builtin_convertvector ((cond), v64qi); \
	     __res.t_v64qi = (__vec1.t_v64qi & __bitmask) \
			      | (__vec2.t_v64qi & ~__bitmask); \
	     }), \
	     ({ \
	      v64di __bitmask = __builtin_convertvector ((cond), v64di); \
	      __res.t_v64di = (__vec1.t_v64di & __bitmask) \
			      | (__vec2.t_v64di & ~__bitmask); \
	      })))); \
  __res.val; \
})

#define VECTOR_COND_MOVE(var, val, cond) \
do { \
  _Static_assert (__builtin_types_compatible_p (typeof (var), typeof (val))); \
  __auto_type __cond = __builtin_convertvector ((cond), typeof (__mask)); \
  var = VECTOR_MERGE ((val), var, __cond & __mask); \
} while (0)

#define VECTOR_IF(cond, cond_var) \
{ \
  __auto_type cond_var = (cond); \
  __auto_type __inv_cond __attribute__((unused)) = ~cond_var; \
  if (!ALL_ZEROES_P (cond_var)) \
  {

#define VECTOR_ELSEIF(cond, cond_var) \
  } \
  cond_var = __inv_cond & (cond); \
  __inv_cond &= ~(cond); \
  if (!ALL_ZEROES_P (cond_var)) \
  {

#define VECTOR_ELSE(cond_var) \
  } \
  cond_var = __inv_cond; \
  if (!ALL_ZEROES_P (cond_var)) \
  {

#define VECTOR_IF2(cond, cond_var, prev_cond_var) \
{ \
  __auto_type cond_var = (cond) & __builtin_convertvector (prev_cond_var, typeof (cond)); \
  __auto_type __inv_cond __attribute__((unused)) = ~cond_var; \
  if (!ALL_ZEROES_P (cond_var)) \
  {

#define VECTOR_ELSEIF2(cond, cond_var, prev_cond_var) \
  } \
  cond_var = (cond) & __inv_cond & __builtin_convertvector (prev_cond_var, typeof (cond)); \
  __inv_cond &= ~(cond); \
  if (!ALL_ZEROES_P (cond_var)) \
  {

#define VECTOR_ELSE2(cond_var, prev_cond_var) \
  } \
  cond_var = __inv_cond & __builtin_convertvector (prev_cond_var, typeof (__inv_cond)); \
  if (!ALL_ZEROES_P (cond_var)) \
  {


#define VECTOR_ENDIF \
  } \
}

#define VECTOR_INIT_AUX(x, type) \
({ \
  typeof (x) __e = (x); \
  type __tmp = { \
    __e, __e, __e, __e, __e, __e, __e, __e, \
    __e, __e, __e, __e, __e, __e, __e, __e, \
    __e, __e, __e, __e, __e, __e, __e, __e, \
    __e, __e, __e, __e, __e, __e, __e, __e, \
    __e, __e, __e, __e, __e, __e, __e, __e, \
    __e, __e, __e, __e, __e, __e, __e, __e, \
    __e, __e, __e, __e, __e, __e, __e, __e, \
    __e, __e, __e, __e, __e, __e, __e, __e }; \
  __tmp; \
})

#define VECTOR_INIT(x) \
  (_Generic ((x), int: VECTOR_INIT_AUX ((x), v64si), \
                  unsigned: VECTOR_INIT_AUX ((x), v64usi), \
                  char: VECTOR_INIT_AUX ((x), v64qi), \
                  unsigned char: VECTOR_INIT_AUX ((x), v64uqi), \
                  short: VECTOR_INIT_AUX ((x), v64hi), \
                  unsigned short: VECTOR_INIT_AUX ((x), v64uhi), \
                  long: VECTOR_INIT_AUX ((x), v64di), \
                  unsigned long: VECTOR_INIT_AUX ((x), v64udi), \
                  float: VECTOR_INIT_AUX ((x), v64sf), \
                  double: VECTOR_INIT_AUX ((x), v64df)))


#if defined (__GCN3__) || defined (__GCN5__) \
    || defined (__CDNA1__) || defined (__CDNA2__)
#define CDNA3_PLUS 0
#else
#define CDNA3_PLUS 1
#endif

#define VECTOR_INIT_MASK(COUNT) \
({ \
  MASKMODE __mask; \
  int count = (COUNT); \
  if (count == 64) \
    { \
      if (sizeof (MASKMODE) < 512 || CDNA3_PLUS) \
	asm ("v_mov%B0\t%0, -1" : "=v"(__mask) : "e"(-1L)); \
      else \
	asm ("v_mov_b32\t%L0, -1\n\t" \
	     "v_mov_b32\t%H0, -1" : "=v"(__mask) : "e"(-1L)); \
    } \
  else \
    { \
      long bitmask = (count == 64 ? -1 : (1<<count)-1); \
      if (sizeof (MASKMODE) < 512 || CDNA3_PLUS) \
        { \
	  asm ("v_mov%B0\t%0, 0" : "=v"(__mask) : "e"(-1L)); \
	  asm ("v_mov%B0\t%0, -1" : "+v"(__mask) : "e"(bitmask)); \
	} \
      else \
        { \
	  asm ("v_mov_b32\t%L0, 0\n\t" \
	       "v_mov_b32\t%H0, 0" : "=v"(__mask) : "e"(-1L)); \
	  asm ("v_mov_b32\t%L0, -1\n\t" \
	       "v_mov_b32\t%H0, -1" : "+v"(__mask) : "e"(bitmask)); \
	} \
    } \
  __mask; \
})

#define ALL_ZEROES_P(x) (COND_TO_BITMASK(x) == 0)

#define COND_TO_BITMASK(x) \
({ \
  long __tmp = 0; \
  __auto_type __x = __builtin_convertvector((x), typeof (__mask)) & __mask; \
  __builtin_choose_expr (sizeof (__mask) != 512, \
                         ({ asm ("v_cmp_ne_u32_e64 %0, %1, 0" \
                                 : "=Sg" (__tmp) \
                                 : "v" (__x)); }), \
                         ({ asm ("v_cmp_ne_u64_e64 %0, %1, 0" \
                                 : "=Sg" (__tmp) \
                                 : "v" (__x)); })); \
  __tmp; \
})

#define VECTOR_WHILE(cond, cond_var, prev_cond_var) \
{ \
  __auto_type cond_var = prev_cond_var; \
  for (;;) { \
    cond_var &= (cond); \
    if (ALL_ZEROES_P (cond_var)) \
      break;

#define VECTOR_ENDWHILE \
  } \
}

#define DEF_VARIANT(FUN, SUFFIX, OTYPE, TYPE, COUNT) \
v##COUNT##OTYPE \
FUN##v##COUNT##SUFFIX (v##COUNT##TYPE __arg1, v##COUNT##TYPE __arg2) \
{ \
  __auto_type __upsized_arg1 = VGPR_CAST (v64##TYPE, __arg1); \
  __auto_type __upsized_arg2 = VGPR_CAST (v64##TYPE, __arg2); \
  __auto_type __mask = VECTOR_INIT_MASK (COUNT); \
  __auto_type __result = FUN##v64##SUFFIX##_aux (__upsized_arg1, __upsized_arg2, __mask); \
  return VGPR_CAST (v##COUNT##OTYPE, __result); \
}

#define DEF_VARIANTS(FUN, SUFFIX, TYPE) \
  DEF_VARIANT (FUN, SUFFIX, TYPE, TYPE, 2) \
  DEF_VARIANT (FUN, SUFFIX, TYPE, TYPE, 4) \
  DEF_VARIANT (FUN, SUFFIX, TYPE, TYPE, 8) \
  DEF_VARIANT (FUN, SUFFIX, TYPE, TYPE, 16) \
  DEF_VARIANT (FUN, SUFFIX, TYPE, TYPE, 32) \
  DEF_VARIANT (FUN, SUFFIX, TYPE, TYPE, 64)

#define DEF_VARIANTS_B(FUN, SUFFIX, OTYPE, TYPE) \
  DEF_VARIANT (FUN, SUFFIX, OTYPE, TYPE, 2) \
  DEF_VARIANT (FUN, SUFFIX, OTYPE, TYPE, 4) \
  DEF_VARIANT (FUN, SUFFIX, OTYPE, TYPE, 8) \
  DEF_VARIANT (FUN, SUFFIX, OTYPE, TYPE, 16) \
  DEF_VARIANT (FUN, SUFFIX, OTYPE, TYPE, 32) \
  DEF_VARIANT (FUN, SUFFIX, OTYPE, TYPE, 64)