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Annotation of gcc/expr.h, revision 1.1

1.1     ! root        1: /* Definitions for code generation pass of GNU compiler.
        !             2:    Copyright (C) 1987 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC is distributed in the hope that it will be useful,
        !             7: but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: accepts responsibility to anyone for the consequences of using it
        !             9: or for whether it serves any particular purpose or works at all,
        !            10: unless he says so in writing.  Refer to the GNU CC General Public
        !            11: License for full details.
        !            12: 
        !            13: Everyone is granted permission to copy, modify and redistribute
        !            14: GNU CC, but only under the conditions described in the
        !            15: GNU CC General Public License.   A copy of this license is
        !            16: supposed to have been given to you along with GNU CC so you
        !            17: can know your rights and responsibilities.  It should be in a
        !            18: file named COPYING.  Among other things, the copyright notice
        !            19: and this notice must be preserved on all copies.  */
        !            20: 
        !            21: 
        !            22: /* Macros to access the slots of a QUEUED rtx.
        !            23:    Here rather than in rtl.h because only the expansion pass
        !            24:    should ever encounter a QUEUED.  */
        !            25: 
        !            26: /* The variable for which an increment is queued.  */
        !            27: #define QUEUED_VAR(P) FORMAT_e (P, 0)
        !            28: /* If the increment has been emitted, this is the insn
        !            29:    that does the increment.  It is zero before the increment is emitted.  */
        !            30: #define QUEUED_INSN(P) FORMAT_e (P, 1)
        !            31: /* If a pre-increment copy has been generated, this is the copy
        !            32:    (it is a temporary reg).  Zero if no copy made yet.  */
        !            33: #define QUEUED_COPY(P) FORMAT_e (P, 2)
        !            34: /* This is the body to use for the insn to do the increment.
        !            35:    It is used to emit the increment.  */
        !            36: #define QUEUED_BODY(P) FORMAT_e (P, 3)
        !            37: /* Next QUEUED in the queue.  */
        !            38: #define QUEUED_NEXT(P) FORMAT_e (P, 4)
        !            39: 
        !            40: /* If this is nonzero, we do not bother generating VOLATILE
        !            41:    around volatile memory references, and we are willing to
        !            42:    output indirect addresses.  If cse is to follow, we reject
        !            43:    indirect addresses so a useful potential cse is generated;
        !            44:    if it is used only once, instruction combination will produce
        !            45:    the same indirect address eventually.  */
        !            46: extern int cse_not_expected;
        !            47: 
        !            48: /* Optabs are tables saying how to generate insn bodies
        !            49:    for various machine modes and numbers of operands.
        !            50:    Each optab applies to one operation.
        !            51:    For example, add_optab applies to addition.
        !            52: 
        !            53:    The insn_code slot is the enum insn_code that says how to
        !            54:    generate an insn for this operation on a particular machine mode.
        !            55:    It is CODE_FOR_nothing if there is no such insn on the target machine.
        !            56: 
        !            57:    The `lib_call' slot is the name of the library function that
        !            58:    can be used to perform the operation.
        !            59: 
        !            60:    A few optabs, such as move_optab and cmp_optab, are used
        !            61:    by special code.  */
        !            62: 
        !            63: /* Everything that uses expr.h needs to define enum insn_code
        !            64:    but we don't list it in the Makefile dependencies just for that.  */
        !            65: #include "insn-codes.h"
        !            66: 
        !            67: typedef struct optab
        !            68: {
        !            69:   enum insn_code insn_code;
        !            70:   char *lib_call;
        !            71: } optab [NUM_MACHINE_MODES];
        !            72: 
        !            73: /* Given an enum insn_code, access the function to construct
        !            74:    the body of that kind of insn.  */
        !            75: #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
        !            76: extern rtx (*insn_gen_function[]) ();
        !            77: 
        !            78: extern optab add_optab;
        !            79: extern optab sub_optab;
        !            80: extern optab smul_optab;       /* Signed multiply */
        !            81: extern optab umul_optab;       /* Unsigned multiply */
        !            82: extern optab smul_widen_optab; /* Signed multiply with result 
        !            83:                                   one machine mode wider than args */
        !            84: extern optab umul_widen_optab;
        !            85: extern optab sdiv_optab;       /* Signed divide */
        !            86: extern optab sdivmod_optab;    /* Signed divide-and-remainder in one */
        !            87: extern optab udiv_optab;
        !            88: extern optab udivmod_optab;
        !            89: extern optab smod_optab;       /* Signed remainder */
        !            90: extern optab umod_optab;
        !            91: extern optab flodiv_optab;     /* Optab for floating divide. */
        !            92: extern optab and_optab;                /* Logical and */
        !            93: extern optab andcb_optab;      /* Logical and with complement of 2nd arg */
        !            94: extern optab ior_optab;                /* Logical or */
        !            95: extern optab xor_optab;                /* Logical xor */
        !            96: extern optab ashl_optab;       /* Arithmetic shift left */
        !            97: extern optab ashr_optab;       /* Arithmetic shift right */
        !            98: extern optab lshl_optab;       /* Logical shift left */
        !            99: extern optab lshr_optab;       /* Logical shift right */
        !           100: extern optab rotl_optab;       /* Rotate left */
        !           101: extern optab rotr_optab;       /* Rotate right */
        !           102: 
        !           103: extern optab mov_optab;                /* Move instruction.  */
        !           104: extern optab movstrict_optab;  /* Move, preserving high part of register.  */
        !           105: 
        !           106: extern optab cmp_optab;                /* Compare insn; two operands.  */
        !           107: extern optab tst_optab;                /* tst insn; compare one operand against 0 */
        !           108: 
        !           109: /* Unary operations */
        !           110: extern optab neg_optab;                /* Negation */
        !           111: extern optab abs_optab;                /* Abs value */
        !           112: extern optab one_cmpl_optab;   /* Bitwise not */
        !           113: 
        !           114: /* Passed to expand_binop and expand_unop to say which options to try to use
        !           115:    if the requested operation can't be open-coded on the requisite mode.
        !           116:    Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
        !           117:    Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.  */
        !           118: 
        !           119: enum optab_methods
        !           120: {
        !           121:   OPTAB_DIRECT,
        !           122:   OPTAB_LIB,
        !           123:   OPTAB_WIDEN,
        !           124:   OPTAB_LIB_WIDEN,
        !           125: };
        !           126: 
        !           127: /* Nonzero means load memory operands into registers before doing
        !           128:    arithmetic on them.  Gives better cse but slower compilation.  */
        !           129: 
        !           130: extern int force_mem;
        !           131: 
        !           132: /* Nonzero for -optforceaddr: load memory address into a register
        !           133:    before reference to it.  This makes better cse but slower compilation.  */
        !           134: 
        !           135: extern int force_addr;
        !           136: 
        !           137: typedef rtx (*rtxfun) ();
        !           138: 
        !           139: /* Expand a binary operation given optab and rtx operands.  */
        !           140: rtx expand_binop ();
        !           141: 
        !           142: /* Expand a unary arithmetic operation given optab rtx operand.  */
        !           143: rtx expand_unop ();
        !           144: 
        !           145: /* Initialize the tables that control conversion between fixed and
        !           146:    floating values.  */
        !           147: void init_fixtab ();
        !           148: void init_floattab ();
        !           149: 
        !           150: /* Say whether a certain floating machine mode can be converted to a certain
        !           151:    fixed machine mode.  */
        !           152: rtxfun can_fix_p ();
        !           153: /* Similar for converting a fixed machine mode to a floating one.  */
        !           154: rtxfun can_float_p ();
        !           155: 
        !           156: /* Generate code for a FIX_EXPR.  */
        !           157: void expand_fix ();
        !           158: 
        !           159: /* Generate code for a FLOAT_EXPR.  */
        !           160: void expand_float ();
        !           161: 
        !           162: /* Create but don't emit one rtl instruction to add one rtx into another.
        !           163:    Modes must match.
        !           164:    Likewise for subtraction and for just copying.
        !           165:    These do not call protect_from_queue; caller must do so.  */
        !           166: rtx gen_add2_insn ();
        !           167: rtx gen_sub2_insn ();
        !           168: rtx gen_move_insn ();
        !           169: 
        !           170: /* Emit one rtl instruction to store zero in specified rtx.  */
        !           171: void emit_clr_insn ();
        !           172: 
        !           173: /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0.  */
        !           174: void emit_0_to_1_insn ();
        !           175: 
        !           176: /* Emit one rtl insn to compare two rtx's.  */
        !           177: void emit_cmp_insn ();
        !           178: 
        !           179: /* Emit some rtl insns to move data between rtx's, converting machine modes.
        !           180:    Both modes must be floating or both fixed.  */
        !           181: void convert_move ();
        !           182: 
        !           183: /* Convert an rtx to specified machine mode and return the result.  */
        !           184: rtx convert_to_mode ();
        !           185: 
        !           186: /* Emit code to push some arguments and call a library routine,
        !           187:    storing the value in a specified place.  Calling sequence is
        !           188:    complicated.  */
        !           189: void emit_library_call ();
        !           190: 
        !           191: /* Given an rtx that may include add and multiply operations,
        !           192:    generate them as insns and return a pseudo-reg containing the value.
        !           193:    Useful after calling expand_expr with 1 as sum_ok.  */
        !           194: rtx force_operand ();
        !           195: 
        !           196: /* Return an rtx for the size in bytes of the value of an expr.  */
        !           197: rtx expr_size ();
        !           198: 
        !           199: /* Return an rtx for the sum of an rtx and an integer.  */
        !           200: rtx plus_constant ();
        !           201: 
        !           202: rtx lookup_static_chain ();
        !           203: 
        !           204: /* Return an rtx like arg but sans any constant terms.
        !           205:    Returns the original rtx if it has no constant terms.
        !           206:    The constant terms are added and stored via a second arg.  */
        !           207: rtx eliminate_constant_term ();
        !           208: 
        !           209: /* Convert arg to a valid memory address for specified machine mode,
        !           210:    by emitting insns to perform arithmetic if nec.  */
        !           211: rtx memory_address ();
        !           212: 
        !           213: rtx low_half ();
        !           214: rtx high_half ();
        !           215: 
        !           216: /* Return 1 if two rtx's are equivalent in structure and elements.  */
        !           217: int rtx_equal_p ();
        !           218: 
        !           219: /* Given rtx, return new rtx whose address won't be affected by
        !           220:    any side effects.  It has been copied to a new temporary reg.  */
        !           221: rtx stabilize ();
        !           222: 
        !           223: /* Given an rtx, copy all regs it refers to into new temps
        !           224:    and return a modified copy that refers to the new temps.  */
        !           225: rtx copy_all_regs ();
        !           226: 
        !           227: /* Copy given rtx to a new temp reg and return that.  */
        !           228: rtx copy_to_reg ();
        !           229: 
        !           230: /* Copy given rtx to given temp reg and return that.  */
        !           231: rtx copy_to_suggested_reg ();
        !           232: 
        !           233: /* Return given rtx, copied into a new temp reg if it was in memory.  */
        !           234: rtx force_not_mem ();
        !           235: 
        !           236: /* Remove some bytes from the stack.  An rtx says how many.  */
        !           237: void adjust_stack ();
        !           238: 
        !           239: /* Add some bytes to the stack.  An rtx says how many.  */
        !           240: void anti_adjust_stack ();
        !           241: 
        !           242: /* Emit code to copy function value to a new temp reg and return that reg.  */
        !           243: rtx function_value ();
        !           244: 
        !           245: /* Return an rtx that refers to the value returned by a function
        !           246:    in its original home.  This becomes invalid if any more code is emitted.  */
        !           247: rtx hard_function_value ();
        !           248: 
        !           249: /* Emit code to copy function value to a specified place.  */
        !           250: void copy_function_value ();
        !           251: 
        !           252: rtx store_bit_field ();
        !           253: rtx store_fixed_bit_field ();
        !           254: rtx extract_bit_field ();
        !           255: rtx extract_fixed_bit_field ();
        !           256: rtx expand_shift ();
        !           257: rtx expand_bit_and ();
        !           258: rtx expand_mult ();
        !           259: rtx expand_divmod ();
        !           260: rtx get_structure_value_addr ();

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