alpha.h

gcc-2.95.3 Linux下最常用的C编译器

/* Definitions of target machine for GNU compiler, for DEC Alpha.
   Copyright (C) 1992, 93-98, 1999 Free Software Foundation, Inc.
   Contributed by Richard Kenner ([e-mail])

This file is part of GNU CC.

GNU CC 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.

GNU CC 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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */


/* Write out the correct language type definition for the header files.  
   Unless we have assembler language, write out the symbols for C.  */
#define CPP_SPEC "\
%{!undef:\
%{.S:-D__LANGUAGE_ASSEMBLY__ -D__LANGUAGE_ASSEMBLY %{!ansi:-DLANGUAGE_ASSEMBLY }}\
%{.cc|.cxx|.C:-D__LANGUAGE_C_PLUS_PLUS__ -D__LANGUAGE_C_PLUS_PLUS -D__cplusplus }\
%{.m:-D__LANGUAGE_OBJECTIVE_C__ -D__LANGUAGE_OBJECTIVE_C }\
%{!.S:%{!.cc:%{!.cxx:%{!.C:%{!.m:-D__LANGUAGE_C__ -D__LANGUAGE_C %{!ansi:-DLANGUAGE_C }}}}}}\
%{mieee:-D_IEEE_FP }\
%{mieee-with-inexact:-D_IEEE_FP -D_IEEE_FP_INEXACT }}\
%(cpp_cpu) %(cpp_subtarget)"

#ifndef CPP_SUBTARGET_SPEC
#define CPP_SUBTARGET_SPEC ""
#endif

/* Set the spec to use for signed char.  The default tests the above macro
   but DEC's compiler can't handle the conditional in a "constant"
   operand.  */

#define SIGNED_CHAR_SPEC "%{funsigned-char:-D__CHAR_UNSIGNED__}"

#define WORD_SWITCH_TAKES_ARG(STR)		\
 (!strcmp (STR, "rpath") || !strcmp (STR, "include")	\
  || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \
  || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \
  || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \
  || !strcmp (STR, "isystem"))

/* Print subsidiary information on the compiler version in use.  */
#define TARGET_VERSION

/* Run-time compilation parameters selecting different hardware subsets.  */

/* Which processor to schedule for. The cpu attribute defines a list that
   mirrors this list, so changes to alpha.md must be made at the same time.  */

enum processor_type
 {PROCESSOR_EV4,			/* 2106[46]{a,} */
  PROCESSOR_EV5,			/* 21164{a,pc,} */
  PROCESSOR_EV6};			/* 21264 */

extern enum processor_type alpha_cpu;

enum alpha_trap_precision
{
  ALPHA_TP_PROG,	/* No precision (default).  */
  ALPHA_TP_FUNC,      	/* Trap contained within originating function.  */
  ALPHA_TP_INSN		/* Instruction accuracy and code is resumption safe. */
};

enum alpha_fp_rounding_mode
{
  ALPHA_FPRM_NORM,	/* Normal rounding mode.  */
  ALPHA_FPRM_MINF,	/* Round towards minus-infinity.  */
  ALPHA_FPRM_CHOP,	/* Chopped rounding mode (towards 0). */
  ALPHA_FPRM_DYN	/* Dynamic rounding mode.  */
};

enum alpha_fp_trap_mode
{
  ALPHA_FPTM_N,		/* Normal trap mode. */
  ALPHA_FPTM_U,		/* Underflow traps enabled.  */
  ALPHA_FPTM_SU,	/* Software completion, w/underflow traps */
  ALPHA_FPTM_SUI	/* Software completion, w/underflow & inexact traps */
};

extern int target_flags;

extern enum alpha_trap_precision alpha_tp;
extern enum alpha_fp_rounding_mode alpha_fprm;
extern enum alpha_fp_trap_mode alpha_fptm;

/* This means that floating-point support exists in the target implementation
   of the Alpha architecture.  This is usually the default.  */
#define MASK_FP		(1 << 0)
#define TARGET_FP	(target_flags & MASK_FP)

/* This means that floating-point registers are allowed to be used.  Note
   that Alpha implementations without FP operations are required to
   provide the FP registers.  */

#define MASK_FPREGS	(1 << 1)
#define TARGET_FPREGS	(target_flags & MASK_FPREGS)

/* This means that gas is used to process the assembler file.  */

#define MASK_GAS	(1 << 2)
#define TARGET_GAS	(target_flags & MASK_GAS)

/* This means that we should mark procedures as IEEE conformant. */

#define MASK_IEEE_CONFORMANT (1 << 3)
#define TARGET_IEEE_CONFORMANT	(target_flags & MASK_IEEE_CONFORMANT)

/* This means we should be IEEE-compliant except for inexact.  */

#define MASK_IEEE	(1 << 4)
#define TARGET_IEEE	(target_flags & MASK_IEEE)

/* This means we should be fully IEEE-compliant.  */

#define MASK_IEEE_WITH_INEXACT (1 << 5)
#define TARGET_IEEE_WITH_INEXACT (target_flags & MASK_IEEE_WITH_INEXACT)

/* This means we must construct all constants rather than emitting
   them as literal data.  */

#define MASK_BUILD_CONSTANTS (1 << 6)
#define TARGET_BUILD_CONSTANTS (target_flags & MASK_BUILD_CONSTANTS)

/* This means we handle floating points in VAX F- (float)
   or G- (double) Format.  */

#define MASK_FLOAT_VAX	(1 << 7)
#define TARGET_FLOAT_VAX (target_flags & MASK_FLOAT_VAX)

/* This means that the processor has byte and half word loads and stores
   (the BWX extension).  */

#define MASK_BWX	(1 << 8)
#define TARGET_BWX	(target_flags & MASK_BWX)

/* This means that the processor has the MAX extension.  */
#define MASK_MAX	(1 << 9)
#define TARGET_MAX	(target_flags & MASK_MAX)

/* This means that the processor has the FIX extension.  */
#define MASK_FIX	(1 << 10)
#define TARGET_FIX	(target_flags & MASK_FIX)

/* This means that the processor has the CIX extension.  */
#define MASK_CIX	(1 << 11)
#define TARGET_CIX	(target_flags & MASK_CIX)

/* This means that the processor is an EV5, EV56, or PCA56.  This is defined
   only in TARGET_CPU_DEFAULT.  */
#define MASK_CPU_EV5	(1 << 28)

/* Likewise for EV6.  */
#define MASK_CPU_EV6	(1 << 29)

/* This means we support the .arch directive in the assembler.  Only
   defined in TARGET_CPU_DEFAULT.  */
#define MASK_SUPPORT_ARCH (1 << 30)
#define TARGET_SUPPORT_ARCH	(target_flags & MASK_SUPPORT_ARCH)

/* These are for target os support and cannot be changed at runtime.  */
#ifndef TARGET_WINDOWS_NT
#define TARGET_WINDOWS_NT 0
#endif
#ifndef TARGET_OPEN_VMS
#define TARGET_OPEN_VMS 0
#endif

#ifndef TARGET_AS_CAN_SUBTRACT_LABELS
#define TARGET_AS_CAN_SUBTRACT_LABELS TARGET_GAS
#endif
#ifndef TARGET_CAN_FAULT_IN_PROLOGUE
#define TARGET_CAN_FAULT_IN_PROLOGUE 0
#endif

/* Macro to define tables used to set the flags.
   This is a list in braces of pairs in braces,
   each pair being { "NAME", VALUE }
   where VALUE is the bits to set or minus the bits to clear.
   An empty string NAME is used to identify the default VALUE.  */

#define TARGET_SWITCHES							\
  { {"no-soft-float", MASK_FP, "Use hardware fp"},			\
    {"soft-float", - MASK_FP, "Do not use hardware fp"},		\
    {"fp-regs", MASK_FPREGS, "Use fp registers"},			\
    {"no-fp-regs", - (MASK_FP|MASK_FPREGS), "Do not use fp registers"},	\
    {"alpha-as", -MASK_GAS, "Do not assume GAS"},			\
    {"gas", MASK_GAS, "Assume GAS"},					\
    {"ieee-conformant", MASK_IEEE_CONFORMANT,				\
     "Request IEEE-conformant math library routines (OSF/1)"},		\
    {"ieee", MASK_IEEE|MASK_IEEE_CONFORMANT,				\
     "Emit IEEE-conformant code, without inexact exceptions"},		\
    {"ieee-with-inexact", MASK_IEEE_WITH_INEXACT|MASK_IEEE_CONFORMANT,	\
     "Emit IEEE-conformant code, with inexact exceptions"},		\
    {"build-constants", MASK_BUILD_CONSTANTS,				\
     "Do not emit complex integer constants to read-only memory"},	\
    {"float-vax", MASK_FLOAT_VAX, "Use VAX fp"},			\
    {"float-ieee", -MASK_FLOAT_VAX, "Do not use VAX fp"},		\
    {"bwx", MASK_BWX, "Emit code for the byte/word ISA extension"},	\
    {"no-bwx", -MASK_BWX, ""},						\
    {"max", MASK_MAX, "Emit code for the motion video ISA extension"},	\
    {"no-max", -MASK_MAX, ""},						\
    {"fix", MASK_FIX, "Emit code for the fp move and sqrt ISA extension"}, \
    {"no-fix", -MASK_FIX, ""},						\
    {"cix", MASK_CIX, "Emit code for the counting ISA extension"},	\
    {"no-cix", -MASK_CIX, ""},						\
    {"", TARGET_DEFAULT | TARGET_CPU_DEFAULT, ""} }

#define TARGET_DEFAULT MASK_FP|MASK_FPREGS

#ifndef TARGET_CPU_DEFAULT
#define TARGET_CPU_DEFAULT 0
#endif

/* This macro is similar to `TARGET_SWITCHES' but defines names of
   command options that have values.  Its definition is an initializer
   with a subgrouping for each command option.

   Each subgrouping contains a string constant, that defines the fixed
   part of the option name, and the address of a variable.  The
   variable, type `char *', is set to the variable part of the given
   option if the fixed part matches.  The actual option name is made
   by appending `-m' to the specified name.

   Here is an example which defines `-mshort-data-NUMBER'.  If the
   given option is `-mshort-data-512', the variable `m88k_short_data'
   will be set to the string `"512"'.

	extern char *m88k_short_data;
	#define TARGET_OPTIONS { { "short-data-", &m88k_short_data } }  */

extern const char *alpha_cpu_string;	/* For -mcpu= */
extern const char *alpha_fprm_string;	/* For -mfp-rounding-mode=[n|m|c|d] */
extern const char *alpha_fptm_string;	/* For -mfp-trap-mode=[n|u|su|sui]  */
extern const char *alpha_tp_string;	/* For -mtrap-precision=[p|f|i] */
extern const char *alpha_mlat_string;	/* For -mmemory-latency= */

#define TARGET_OPTIONS					\
{							\
  {"cpu=",		&alpha_cpu_string,		\
   "Generate code for a given CPU"},			\
  {"fp-rounding-mode=",	&alpha_fprm_string,		\
   "Control the generated fp rounding mode"},		\
  {"fp-trap-mode=",	&alpha_fptm_string,		\
   "Control the IEEE trap mode"},			\
  {"trap-precision=",	&alpha_tp_string,		\
   "Control the precision given to fp exceptions"},	\
  {"memory-latency=",	&alpha_mlat_string,		\
   "Tune expected memory latency"},			\
}

/* Attempt to describe CPU characteristics to the preprocessor.  */

/* Corresponding to amask... */
#define CPP_AM_BWX_SPEC	"-D__alpha_bwx__ -Acpu(bwx)"
#define CPP_AM_MAX_SPEC	"-D__alpha_max__ -Acpu(max)"
#define CPP_AM_FIX_SPEC	"-D__alpha_fix__ -Acpu(fix)"
#define CPP_AM_CIX_SPEC	"-D__alpha_cix__ -Acpu(cix)"

/* Corresponding to implver... */
#define CPP_IM_EV4_SPEC	"-D__alpha_ev4__ -Acpu(ev4)"
#define CPP_IM_EV5_SPEC	"-D__alpha_ev5__ -Acpu(ev5)"
#define CPP_IM_EV6_SPEC	"-D__alpha_ev6__ -Acpu(ev6)"

/* Common combinations.  */
#define CPP_CPU_EV4_SPEC	"%(cpp_im_ev4)"
#define CPP_CPU_EV5_SPEC	"%(cpp_im_ev5)"
#define CPP_CPU_EV56_SPEC	"%(cpp_im_ev5) %(cpp_am_bwx)"
#define CPP_CPU_PCA56_SPEC	"%(cpp_im_ev5) %(cpp_am_bwx) %(cpp_am_max)"
#define CPP_CPU_EV6_SPEC	"%(cpp_im_ev6) %(cpp_am_bwx) %(cpp_am_max) %(cpp_am_fix)"

#ifndef CPP_CPU_DEFAULT_SPEC
# if TARGET_CPU_DEFAULT & MASK_CPU_EV6
#  define CPP_CPU_DEFAULT_SPEC		CPP_CPU_EV6_SPEC
# else
#  if TARGET_CPU_DEFAULT & MASK_CPU_EV5
#   if TARGET_CPU_DEFAULT & MASK_MAX
#    define CPP_CPU_DEFAULT_SPEC	CPP_CPU_PCA56_SPEC
#   else
#    if TARGET_CPU_DEFAULT & MASK_BWX
#     define CPP_CPU_DEFAULT_SPEC	CPP_CPU_EV56_SPEC
#    else
#     define CPP_CPU_DEFAULT_SPEC	CPP_CPU_EV5_SPEC
#    endif
#   endif
#  else
#   define CPP_CPU_DEFAULT_SPEC		CPP_CPU_EV4_SPEC
#  endif
# endif
#endif /* CPP_CPU_DEFAULT_SPEC */

#ifndef CPP_CPU_SPEC
#define CPP_CPU_SPEC "\
%{!undef:-Acpu(alpha) -Amachine(alpha) -D__alpha -D__alpha__ \
%{mcpu=ev4|mcpu=21064:%(cpp_cpu_ev4) }\
%{mcpu=ev5|mcpu=21164:%(cpp_cpu_ev5) }\
%{mcpu=ev56|mcpu=21164a:%(cpp_cpu_ev56) }\
%{mcpu=pca56|mcpu=21164pc|mcpu=21164PC:%(cpp_cpu_pca56) }\
%{mcpu=ev6|mcpu=21264:%(cpp_cpu_ev6) }\
%{!mcpu*:%(cpp_cpu_default) }}"
#endif

/* This macro defines names of additional specifications to put in the
   specs that can be used in various specifications like CC1_SPEC.  Its
   definition is an initializer with a subgrouping for each command option.

   Each subgrouping contains a string constant, that defines the
   specification name, and a string constant that used by the GNU CC driver
   program.

   Do not define this macro if it does not need to do anything.  */

#ifndef SUBTARGET_EXTRA_SPECS
#define SUBTARGET_EXTRA_SPECS
#endif

#define EXTRA_SPECS				\
  { "cpp_am_bwx", CPP_AM_BWX_SPEC },		\
  { "cpp_am_max", CPP_AM_MAX_SPEC },		\
  { "cpp_am_fix", CPP_AM_FIX_SPEC },		\
  { "cpp_am_cix", CPP_AM_CIX_SPEC },		\
  { "cpp_im_ev4", CPP_IM_EV4_SPEC },		\
  { "cpp_im_ev5", CPP_IM_EV5_SPEC },		\
  { "cpp_im_ev6", CPP_IM_EV6_SPEC },		\
  { "cpp_cpu_ev4", CPP_CPU_EV4_SPEC },		\
  { "cpp_cpu_ev5", CPP_CPU_EV5_SPEC },		\
  { "cpp_cpu_ev56", CPP_CPU_EV56_SPEC },	\
  { "cpp_cpu_pca56", CPP_CPU_PCA56_SPEC },	\
  { "cpp_cpu_ev6", CPP_CPU_EV6_SPEC },		\
  { "cpp_cpu_default", CPP_CPU_DEFAULT_SPEC },	\
  { "cpp_cpu", CPP_CPU_SPEC },			\
  { "cpp_subtarget", CPP_SUBTARGET_SPEC },	\
  SUBTARGET_EXTRA_SPECS


/* Sometimes certain combinations of command options do not make sense