rs6000-c.c

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/* Subroutines for the C front end on the POWER and PowerPC architectures.
   Copyright (C) 2002, 2003, 2004, 2005
   Free Software Foundation, Inc.

   Contributed by Zack Weinberg <[e-mail]>
   and Paolo Bonzini <[e-mail]>

   This file is part of GCC.

   GCC 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 2, or (at your
   option) any later version.

   GCC 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.

   You should have received a copy of the GNU General Public License
   along with GCC; see the file COPYING.  If not, write to the
   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "cpplib.h"
#include "tree.h"
#include "c-common.h"
#include "c-pragma.h"
#include "c-tree.h"
#include "toplev.h"
#include "tm_p.h"
#include "target.h"
#include "langhooks.h"



/* Handle the machine specific pragma longcall.  Its syntax is

   # pragma longcall ( TOGGLE )

   where TOGGLE is either 0 or 1.

   rs6000_default_long_calls is set to the value of TOGGLE, changing
   whether or not new function declarations receive a longcall
   attribute by default.  */

#define SYNTAX_ERROR(gmsgid) do {					\
  warning (OPT_Wpragmas, gmsgid);					\
  warning (OPT_Wpragmas, "ignoring malformed #pragma longcall");	\
  return;								\
} while (0)

void
rs6000_pragma_longcall (cpp_reader *pfile ATTRIBUTE_UNUSED)
{
  tree x, n;

  /* If we get here, generic code has already scanned the directive
     leader and the word "longcall".  */

  if (c_lex (&x) != CPP_OPEN_PAREN)
    SYNTAX_ERROR ("missing open paren");
  if (c_lex (&n) != CPP_NUMBER)
    SYNTAX_ERROR ("missing number");
  if (c_lex (&x) != CPP_CLOSE_PAREN)
    SYNTAX_ERROR ("missing close paren");

  if (n != integer_zero_node && n != integer_one_node)
    SYNTAX_ERROR ("number must be 0 or 1");

  if (c_lex (&x) != CPP_EOF)
    warning (OPT_Wpragmas, "junk at end of #pragma longcall");

  rs6000_default_long_calls = (n == integer_one_node);
}

/* Handle defining many CPP flags based on TARGET_xxx.  As a general
   policy, rather than trying to guess what flags a user might want a
   #define for, it's better to define a flag for everything.  */

#define builtin_define(TXT) cpp_define (pfile, TXT)
#define builtin_assert(TXT) cpp_assert (pfile, TXT)

void
rs6000_cpu_cpp_builtins (cpp_reader *pfile)
{
  if (TARGET_POWER2)
    builtin_define ("_ARCH_PWR2");
  else if (TARGET_POWER)
    builtin_define ("_ARCH_PWR");
  if (TARGET_POWERPC)
    builtin_define ("_ARCH_PPC");
  if (TARGET_PPC_GPOPT)
    builtin_define ("_ARCH_PPCSQ");
  if (TARGET_PPC_GFXOPT)
    builtin_define ("_ARCH_PPCGR");
  if (TARGET_POWERPC64)
    builtin_define ("_ARCH_PPC64");
  if (TARGET_MFCRF)
    builtin_define ("_ARCH_PWR4");
  if (TARGET_POPCNTB)
    builtin_define ("_ARCH_PWR5");
  if (TARGET_FPRND)
    builtin_define ("_ARCH_PWR5X");
  if (! TARGET_POWER && ! TARGET_POWER2 && ! TARGET_POWERPC)
    builtin_define ("_ARCH_COM");
  if (TARGET_ALTIVEC)
    {
      builtin_define ("__ALTIVEC__");
      builtin_define ("__VEC__=10206");

      /* Define the AltiVec syntactic elements.  */
      builtin_define ("__vector=__attribute__((altivec(vector__)))");
      builtin_define ("__pixel=__attribute__((altivec(pixel__))) unsigned short");
      builtin_define ("__bool=__attribute__((altivec(bool__))) unsigned");
    }
  if (TARGET_SPE)
    builtin_define ("__SPE__");
  if (TARGET_SOFT_FLOAT)
    builtin_define ("_SOFT_FLOAT");
  /* Used by lwarx/stwcx. errata work-around.  */
  if (rs6000_cpu == PROCESSOR_PPC405)
    builtin_define ("__PPC405__");

  /* May be overridden by target configuration.  */
  RS6000_CPU_CPP_ENDIAN_BUILTINS();

  if (TARGET_LONG_DOUBLE_128)
    builtin_define ("__LONG_DOUBLE_128__");

  switch (rs6000_current_abi)
    {
    case ABI_V4:
      builtin_define ("_CALL_SYSV");
      break;
    case ABI_AIX:
      builtin_define ("_CALL_AIXDESC");
      builtin_define ("_CALL_AIX");
      break;
    case ABI_DARWIN:
      builtin_define ("_CALL_DARWIN");
      break;
    default:
      break;
    }

  /* Let the compiled code know if 'f' class registers will not be available.  */
  if (TARGET_SOFT_FLOAT || !TARGET_FPRS)
    builtin_define ("__NO_FPRS__");
}


struct altivec_builtin_types
{
  enum rs6000_builtins code;
  enum rs6000_builtins overloaded_code;
  signed char ret_type;
  signed char op1;
  signed char op2;
  signed char op3;
};

const struct altivec_builtin_types altivec_overloaded_builtins[] = {
  /* Unary AltiVec builtins.  */
  { ALTIVEC_BUILTIN_VEC_ABS, ALTIVEC_BUILTIN_ABS_V16QI,
    RS6000_BTI_V16QI, RS6000_BTI_V16QI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_ABS, ALTIVEC_BUILTIN_ABS_V8HI,
    RS6000_BTI_V8HI, RS6000_BTI_V8HI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_ABS, ALTIVEC_BUILTIN_ABS_V4SI,
    RS6000_BTI_V4SI, RS6000_BTI_V4SI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_ABS, ALTIVEC_BUILTIN_ABS_V4SF,
    RS6000_BTI_V4SF, RS6000_BTI_V4SF, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_ABSS, ALTIVEC_BUILTIN_ABSS_V16QI,
    RS6000_BTI_V16QI, RS6000_BTI_V16QI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_ABSS, ALTIVEC_BUILTIN_ABSS_V8HI,
    RS6000_BTI_V8HI, RS6000_BTI_V8HI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_ABSS, ALTIVEC_BUILTIN_ABSS_V4SI,
    RS6000_BTI_V4SI, RS6000_BTI_V4SI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_CEIL, ALTIVEC_BUILTIN_VRFIP,
    RS6000_BTI_V4SF, RS6000_BTI_V4SF, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_EXPTE, ALTIVEC_BUILTIN_VEXPTEFP,
    RS6000_BTI_V4SF, RS6000_BTI_V4SF, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_FLOOR, ALTIVEC_BUILTIN_VRFIM,
    RS6000_BTI_V4SF, RS6000_BTI_V4SF, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_LOGE, ALTIVEC_BUILTIN_VLOGEFP,
    RS6000_BTI_V4SF, RS6000_BTI_V4SF, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_MTVSCR, ALTIVEC_BUILTIN_MTVSCR,
    RS6000_BTI_void, RS6000_BTI_V4SI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_MTVSCR, ALTIVEC_BUILTIN_MTVSCR,
    RS6000_BTI_void, RS6000_BTI_unsigned_V4SI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_MTVSCR, ALTIVEC_BUILTIN_MTVSCR,
    RS6000_BTI_void, RS6000_BTI_bool_V4SI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_MTVSCR, ALTIVEC_BUILTIN_MTVSCR,
    RS6000_BTI_void, RS6000_BTI_V8HI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_MTVSCR, ALTIVEC_BUILTIN_MTVSCR,
    RS6000_BTI_void, RS6000_BTI_unsigned_V8HI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_MTVSCR, ALTIVEC_BUILTIN_MTVSCR,
    RS6000_BTI_void, RS6000_BTI_bool_V8HI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_MTVSCR, ALTIVEC_BUILTIN_MTVSCR,
    RS6000_BTI_void, RS6000_BTI_pixel_V8HI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_MTVSCR, ALTIVEC_BUILTIN_MTVSCR,
    RS6000_BTI_void, RS6000_BTI_V16QI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_MTVSCR, ALTIVEC_BUILTIN_MTVSCR,
    RS6000_BTI_void, RS6000_BTI_unsigned_V16QI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_MTVSCR, ALTIVEC_BUILTIN_MTVSCR,
    RS6000_BTI_void, RS6000_BTI_bool_V16QI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_RE, ALTIVEC_BUILTIN_VREFP,
    RS6000_BTI_V4SF, RS6000_BTI_V4SF, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_ROUND, ALTIVEC_BUILTIN_VRFIN,
    RS6000_BTI_V4SF, RS6000_BTI_V4SF, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_RSQRTE, ALTIVEC_BUILTIN_VRSQRTEFP,
    RS6000_BTI_V4SF, RS6000_BTI_V4SF, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_TRUNC, ALTIVEC_BUILTIN_VRFIZ,
    RS6000_BTI_V4SF, RS6000_BTI_V4SF, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_UNPACKH, ALTIVEC_BUILTIN_VUPKHSB,
    RS6000_BTI_V8HI, RS6000_BTI_V16QI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_UNPACKH, ALTIVEC_BUILTIN_VUPKHSB,
    RS6000_BTI_V8HI, RS6000_BTI_bool_V16QI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_UNPACKH, ALTIVEC_BUILTIN_VUPKHSH,
    RS6000_BTI_V4SI, RS6000_BTI_V8HI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_UNPACKH, ALTIVEC_BUILTIN_VUPKHSH,
    RS6000_BTI_V4SI, RS6000_BTI_bool_V8HI, 0, 0 },
  { ALTIVEC_BUILTIN_VEC_UNPACKH, ALTIVEC_BUILTIN_VUPKHPX,