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1.1 root 1: /* Register Transfer Language (RTL) definitions for GNU C-Compiler 1.1.1.4 ! root 2: Copyright (C) 1987, 1991, 1992 Free Software Foundation, Inc. 1.1 root 3: 4: This file is part of GNU CC. 5: 6: GNU CC is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU CC is distributed in the hope that it will be useful, 12: but WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14: GNU General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU CC; see the file COPYING. If not, write to 18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ 19: 20: 21: #include "machmode.h" 22: 23: #undef FFS /* Some systems predefine this symbol; don't let it interfere. */ 24: #undef FLOAT /* Likewise. */ 25: 26: /* Register Transfer Language EXPRESSIONS CODES */ 27: 28: #define RTX_CODE enum rtx_code 29: enum rtx_code { 30: 31: #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM , 32: #include "rtl.def" /* rtl expressions are documented here */ 33: #undef DEF_RTL_EXPR 34: 1.1.1.3 root 35: LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for 1.1 root 36: NUM_RTX_CODE. 1.1.1.3 root 37: Assumes default enum value assignment. */ 1.1 root 38: 39: #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE) 40: /* The cast here, saves many elsewhere. */ 41: 42: extern int rtx_length[]; 43: #define GET_RTX_LENGTH(CODE) (rtx_length[(int)(CODE)]) 44: 45: extern char *rtx_name[]; 46: #define GET_RTX_NAME(CODE) (rtx_name[(int)(CODE)]) 47: 48: extern char *rtx_format[]; 49: #define GET_RTX_FORMAT(CODE) (rtx_format[(int)(CODE)]) 50: 51: extern char rtx_class[]; 52: #define GET_RTX_CLASS(CODE) (rtx_class[(int)(CODE)]) 53: 54: /* Common union for an element of an rtx. */ 55: 56: typedef union rtunion_def 57: { 1.1.1.4 ! root 58: HOST_WIDE_INT rtwint; 1.1 root 59: int rtint; 60: char *rtstr; 61: struct rtx_def *rtx; 62: struct rtvec_def *rtvec; 63: enum machine_mode rttype; 64: } rtunion; 65: 66: /* RTL expression ("rtx"). */ 67: 68: typedef struct rtx_def 69: { 70: #ifdef ONLY_INT_FIELDS 1.1.1.4 ! root 71: #ifdef CODE_FIELD_BUG ! 72: unsigned int code : 16; ! 73: #else 1.1 root 74: unsigned short code; 1.1.1.4 ! root 75: #endif 1.1 root 76: #else 77: /* The kind of expression this is. */ 78: enum rtx_code code : 16; 79: #endif 80: /* The kind of value the expression has. */ 81: #ifdef ONLY_INT_FIELDS 82: int mode : 8; 83: #else 84: enum machine_mode mode : 8; 85: #endif 86: /* 1 in an INSN if it can alter flow of control 87: within this function. Not yet used! */ 88: unsigned int jump : 1; 89: /* 1 in an INSN if it can call another function. Not yet used! */ 90: unsigned int call : 1; 91: /* 1 in a MEM or REG if value of this expression will never change 92: during the current function, even though it is not 93: manifestly constant. 1.1.1.4 ! root 94: 1 in a SUBREG if it is from a promoted variable that is unsigned. 1.1 root 95: 1 in a SYMBOL_REF if it addresses something in the per-function 96: constants pool. 97: 1 in a CALL_INSN if it is a const call. 98: 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from 99: reorg until end of compilation; cleared before used. */ 100: unsigned int unchanging : 1; 101: /* 1 in a MEM expression if contents of memory are volatile. 102: 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER 103: if it is deleted. 104: 1 in a REG expression if corresponds to a variable declared by the user. 105: 0 for an internally generated temporary. 1.1.1.4 ! root 106: In a SYMBOL_REF, this flag is used for machine-specific purposes. ! 107: In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */ 1.1 root 108: unsigned int volatil : 1; 109: /* 1 in a MEM referring to a field of a structure (not a union!). 110: 0 if the MEM was a variable or the result of a * operator in C; 111: 1 if it was the result of a . or -> operator (on a struct) in C. 112: 1 in a REG if the register is used only in exit code a loop. 1.1.1.4 ! root 113: 1 in a SUBREG expression if was generated from a variable with a ! 114: promoted mode. 1.1 root 115: 1 in a CODE_LABEL if the label is used for nonlocal gotos 116: and must not be deleted even if its count is zero. 117: 1 in a LABEL_REF if this is a reference to a label outside the 118: current loop. 119: 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled 1.1.1.2 root 120: together with the preceding insn. Valid only within sched. 1.1 root 121: 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and 122: from the target of a branch. Valid from reorg until end of compilation; 123: cleared before used. */ 124: unsigned int in_struct : 1; 125: /* 1 if this rtx is used. This is used for copying shared structure. 126: See `unshare_all_rtl'. 127: In a REG, this is not needed for that purpose, and used instead 128: in `leaf_renumber_regs_insn'. 129: In a SYMBOL_REF, means that emit_library_call 130: has used it as the function. */ 131: unsigned int used : 1; 132: /* Nonzero if this rtx came from procedure integration. 133: In a REG, nonzero means this reg refers to the return value 134: of the current function. */ 135: unsigned integrated : 1; 136: /* The first element of the operands of this rtx. 137: The number of operands and their types are controlled 138: by the `code' field, according to rtl.def. */ 139: rtunion fld[1]; 140: } *rtx; 141: 1.1.1.4 ! root 142: /* Add prototype support. */ ! 143: #ifndef PROTO ! 144: #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__) ! 145: #define PROTO(ARGS) ARGS ! 146: #else ! 147: #define PROTO(ARGS) () ! 148: #endif ! 149: #endif ! 150: 1.1 root 151: #define NULL_RTX (rtx) 0 152: 1.1.1.4 ! root 153: /* Define a generic NULL if one hasn't already been defined. */ ! 154: ! 155: #ifndef NULL ! 156: #define NULL 0 ! 157: #endif ! 158: ! 159: #ifndef GENERIC_PTR ! 160: #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__) ! 161: #define GENERIC_PTR void * ! 162: #else ! 163: #define GENERIC_PTR char * ! 164: #endif ! 165: #endif ! 166: ! 167: #ifndef NULL_PTR ! 168: #define NULL_PTR ((GENERIC_PTR)0) ! 169: #endif ! 170: 1.1 root 171: /* Define macros to access the `code' field of the rtx. */ 172: 173: #ifdef SHORT_ENUM_BUG 174: #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code)) 175: #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE))) 176: #else 177: #define GET_CODE(RTX) ((RTX)->code) 178: #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE)) 179: #endif 180: 181: #define GET_MODE(RTX) ((RTX)->mode) 182: #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE)) 183: 184: #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated) 185: #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging) 186: 187: /* RTL vector. These appear inside RTX's when there is a need 188: for a variable number of things. The principle use is inside 189: PARALLEL expressions. */ 190: 191: typedef struct rtvec_def{ 192: unsigned num_elem; /* number of elements */ 193: rtunion elem[1]; 194: } *rtvec; 195: 196: #define NULL_RTVEC (rtvec) 0 197: 198: #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem) 199: #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM) 200: 201: #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx) 202: 203: /* 1 if X is a REG. */ 204: 205: #define REG_P(X) (GET_CODE (X) == REG) 206: 207: /* 1 if X is a constant value that is an integer. */ 208: 209: #define CONSTANT_P(X) \ 210: (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \ 211: || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \ 212: || GET_CODE (X) == CONST || GET_CODE (X) == HIGH) 213: 214: /* General accessor macros for accessing the fields of an rtx. */ 215: 216: #define XEXP(RTX, N) ((RTX)->fld[N].rtx) 217: #define XINT(RTX, N) ((RTX)->fld[N].rtint) 1.1.1.4 ! root 218: #define XWINT(RTX, N) ((RTX)->fld[N].rtwint) 1.1 root 219: #define XSTR(RTX, N) ((RTX)->fld[N].rtstr) 220: #define XVEC(RTX, N) ((RTX)->fld[N].rtvec) 221: #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem) 222: #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx) 223: 224: /* ACCESS MACROS for particular fields of insns. */ 225: 226: /* Holds a unique number for each insn. 227: These are not necessarily sequentially increasing. */ 228: #define INSN_UID(INSN) ((INSN)->fld[0].rtint) 229: 230: /* Chain insns together in sequence. */ 231: #define PREV_INSN(INSN) ((INSN)->fld[1].rtx) 232: #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx) 233: 234: /* The body of an insn. */ 235: #define PATTERN(INSN) ((INSN)->fld[3].rtx) 236: 237: /* Code number of instruction, from when it was recognized. 238: -1 means this instruction has not been recognized yet. */ 239: #define INSN_CODE(INSN) ((INSN)->fld[4].rtint) 240: 241: /* Set up in flow.c; empty before then. 242: Holds a chain of INSN_LIST rtx's whose first operands point at 243: previous insns with direct data-flow connections to this one. 244: That means that those insns set variables whose next use is in this insn. 245: They are always in the same basic block as this insn. */ 246: #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx) 247: 248: /* 1 if insn has been deleted. */ 249: #define INSN_DELETED_P(INSN) ((INSN)->volatil) 250: 251: /* 1 if insn is a call to a const function. */ 252: #define CONST_CALL_P(INSN) ((INSN)->unchanging) 253: 254: /* 1 if insn is a branch that should not unconditionally execute its 255: delay slots, i.e., it is an annulled branch. */ 256: #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging) 257: 258: /* 1 if insn is in a delay slot and is from the target of the branch. If 1.1.1.3 root 259: the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be 1.1 root 260: executed if the branch is taken. For annulled branches with this bit 261: clear, the insn should be executed only if the branch is not taken. */ 262: #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct) 263: 264: /* Holds a list of notes on what this insn does to various REGs. 265: It is a chain of EXPR_LIST rtx's, where the second operand 266: is the chain pointer and the first operand is the REG being described. 267: The mode field of the EXPR_LIST contains not a real machine mode 268: but a value that says what this note says about the REG: 269: REG_DEAD means that the value in REG dies in this insn (i.e., it is 270: not needed past this insn). If REG is set in this insn, the REG_DEAD 271: note may, but need not, be omitted. 272: REG_INC means that the REG is autoincremented or autodecremented. 273: REG_EQUIV describes the insn as a whole; it says that the 274: insn sets a register to a constant value or to be equivalent to 275: a memory address. If the 276: register is spilled to the stack then the constant value 277: should be substituted for it. The contents of the REG_EQUIV 278: is the constant value or memory address, which may be different 279: from the source of the SET although it has the same value. 280: REG_EQUAL is like REG_EQUIV except that the destination 281: is only momentarily equal to the specified rtx. Therefore, it 282: cannot be used for substitution; but it can be used for cse. 283: REG_RETVAL means that this insn copies the return-value of 284: a library call out of the hard reg for return values. This note 285: is actually an INSN_LIST and it points to the first insn involved 286: in setting up arguments for the call. flow.c uses this to delete 287: the entire library call when its result is dead. 288: REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn 289: of the library call and points at the one that has the REG_RETVAL. 290: REG_WAS_0 says that the register set in this insn held 0 before the insn. 291: The contents of the note is the insn that stored the 0. 292: If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative. 293: The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST. 294: REG_NONNEG means that the register is always nonnegative during 295: the containing loop. This is used in branches so that decrement and 296: branch instructions terminating on zero can be matched. There must be 297: an insn pattern in the md file named `decrement_and_branch_until_zero' 298: or else this will never be added to any instructions. 299: REG_NO_CONFLICT means there is no conflict *after this insn* 300: between the register in the note and the destination of this insn. 301: REG_UNUSED identifies a register set in this insn and never used. 302: REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use 303: CC0, respectively. Normally, these are required to be consecutive insns, 304: but we permit putting a cc0-setting insn in the delay slot of a branch 305: as long as only one copy of the insn exists. In that case, these notes 306: point from one to the other to allow code generation to determine what 307: any require information and to properly update CC_STATUS. 308: REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to 309: say that the CODE_LABEL contained in the REG_LABEL note is used 310: by the insn. 311: REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read) 312: dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output 313: (write after write) dependencies. Data dependencies, which are the only 314: type of LOG_LINK created by flow, are represented by a 0 reg note kind. */ 315: 316: #define REG_NOTES(INSN) ((INSN)->fld[6].rtx) 317: 318: /* Don't forget to change reg_note_name in rtl.c. */ 319: enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4, 320: REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7, 321: REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10, 322: REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13, 323: REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 }; 324: 325: /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */ 326: #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK)) 327: #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND)) 328: 329: /* Names for REG_NOTE's in EXPR_LIST insn's. */ 330: 331: extern char *reg_note_name[]; 332: #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)]) 333: 334: /* The label-number of a code-label. The assembler label 335: is made from `L' and the label-number printed in decimal. 336: Label numbers are unique in a compilation. */ 337: #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint) 338: 339: #define LINE_NUMBER NOTE 340: 341: /* In a NOTE that is a line number, this is a string for the file name 1.1.1.4 ! root 342: that the line is in. We use the same field to record block numbers ! 343: temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. ! 344: (We avoid lots of casts between ints and pointers if we use a ! 345: different macro for the bock number.) */ 1.1 root 346: 347: #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr) 1.1.1.4 ! root 348: #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint) 1.1 root 349: 350: /* In a NOTE that is a line number, this is the line number. 351: Other kinds of NOTEs are identified by negative numbers here. */ 352: #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint) 353: 354: /* Codes that appear in the NOTE_LINE_NUMBER field 355: for kinds of notes that are not line numbers. */ 356: 357: /* This note indicates the end of the real body of the function, 358: after moving the parms into their homes, etc. */ 359: #define NOTE_INSN_FUNCTION_BEG 0 360: 361: /* This note is used to get rid of an insn 362: when it isn't safe to patch the insn out of the chain. */ 363: #define NOTE_INSN_DELETED -1 364: #define NOTE_INSN_BLOCK_BEG -2 365: #define NOTE_INSN_BLOCK_END -3 366: #define NOTE_INSN_LOOP_BEG -4 367: #define NOTE_INSN_LOOP_END -5 368: /* This kind of note is generated at the end of the function body, 369: just before the return insn or return label. 370: In an optimizing compilation it is deleted by the first jump optimization, 371: after enabling that optimizer to determine whether control can fall 372: off the end of the function body without a return statement. */ 373: #define NOTE_INSN_FUNCTION_END -6 374: /* This kind of note is generated just after each call to `setjmp', et al. */ 375: #define NOTE_INSN_SETJMP -7 376: /* Generated at the place in a loop that `continue' jumps to. */ 377: #define NOTE_INSN_LOOP_CONT -8 378: /* Generated at the start of a duplicated exit test. */ 379: #define NOTE_INSN_LOOP_VTOP -9 1.1.1.4 ! root 380: /* This marks the point immediately after the last prologue insn. */ ! 381: #define NOTE_INSN_PROLOGUE_END -10 ! 382: /* This marks the point immediately prior to the first epilogue insn. */ ! 383: #define NOTE_INSN_EPILOGUE_BEG -11 ! 384: /* Generated in place of user-declared labels when they are deleted. */ ! 385: #define NOTE_INSN_DELETED_LABEL -12 1.1 root 386: /* Don't forget to change note_insn_name in rtl.c. */ 387: 1.1.1.4 ! root 388: ! 389: #if 0 /* These are not used, and I don't know what they were for. --rms. */ 1.1 root 390: #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr) 391: #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint) 392: #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx) 393: #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint) 394: #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint) 1.1.1.4 ! root 395: #endif /* 0 */ 1.1 root 396: 397: /* Names for NOTE insn's other than line numbers. */ 398: 399: extern char *note_insn_name[]; 400: #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)]) 401: 402: /* The name of a label, in case it corresponds to an explicit label 403: in the input source code. */ 404: #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr) 405: 406: /* In jump.c, each label contains a count of the number 407: of LABEL_REFs that point at it, so unused labels can be deleted. */ 408: #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint) 409: 410: /* In jump.c, each JUMP_INSN can point to a label that it can jump to, 411: so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can 412: be decremented and possibly the label can be deleted. */ 413: #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx) 414: 415: /* Once basic blocks are found in flow.c, 416: each CODE_LABEL starts a chain that goes through 417: all the LABEL_REFs that jump to that label. 418: The chain eventually winds up at the CODE_LABEL; it is circular. */ 419: #define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx) 420: 421: /* This is the field in the LABEL_REF through which the circular chain 422: of references to a particular label is linked. 423: This chain is set up in flow.c. */ 424: 425: #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx) 426: 427: /* Once basic blocks are found in flow.c, 428: Each LABEL_REF points to its containing instruction with this field. */ 429: 430: #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx) 431: 432: /* For a REG rtx, REGNO extracts the register number. */ 433: 434: #define REGNO(RTX) ((RTX)->fld[0].rtint) 435: 436: /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg 437: is the current function's return value. */ 438: 439: #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated) 440: 441: /* 1 in a REG rtx if it corresponds to a variable declared by the user. */ 442: #define REG_USERVAR_P(RTX) ((RTX)->volatil) 443: 444: /* For a CONST_INT rtx, INTVAL extracts the integer. */ 445: 1.1.1.4 ! root 446: #define INTVAL(RTX) ((RTX)->fld[0].rtwint) 1.1 root 447: 448: /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of. 449: SUBREG_WORD extracts the word-number. */ 450: 451: #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx) 452: #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint) 453: 1.1.1.4 ! root 454: /* 1 if the REG contained in SUBREG_REG is already known to be ! 455: sign- or zero-extended from the mode of the SUBREG to the mode of ! 456: the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the ! 457: extension. ! 458: ! 459: When used as a LHS, is means that this extension must be done ! 460: when assigning to SUBREG_REG. */ ! 461: ! 462: #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct) ! 463: #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging) ! 464: 1.1 root 465: /* Access various components of an ASM_OPERANDS rtx. */ 466: 467: #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0) 468: #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1) 469: #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2) 470: #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3) 471: #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4) 472: #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N)) 473: #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3) 474: #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0) 475: #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N))) 476: #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5) 477: #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6) 478: 479: /* For a MEM rtx, 1 if it's a volatile reference. 480: Also in an ASM_OPERANDS rtx. */ 481: #define MEM_VOLATILE_P(RTX) ((RTX)->volatil) 482: 483: /* For a MEM rtx, 1 if it refers to a structure or union component. */ 484: #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct) 485: 486: /* For a LABEL_REF, 1 means that this reference is to a label outside the 487: loop containing the reference. */ 488: #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct) 489: 1.1.1.4 ! root 490: /* For a LABEL_REF, 1 means it is for a nonlocal label. */ ! 491: /* Likewise in an EXPR_LIST for a REG_LABEL note. */ ! 492: #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil) ! 493: 1.1 root 494: /* For a CODE_LABEL, 1 means always consider this label to be needed. */ 495: #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct) 496: 497: /* For a REG, 1 means the register is used only in an exit test of a loop. */ 498: #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct) 499: 500: /* During sched, for an insn, 1 means that the insn must be scheduled together 1.1.1.2 root 501: with the preceding insn. */ 1.1 root 502: #define SCHED_GROUP_P(INSN) ((INSN)->in_struct) 503: 1.1.1.4 ! root 504: /* During sched, for the LOG_LINKS of an insn, these cache the adjusted ! 505: cost of the dependence link. The cost of executing an instruction ! 506: may vary based on how the results are used. LINK_COST_ZERO is 1 when ! 507: the cost through the link varies and is unchanged (i.e., the link has ! 508: zero additional cost). LINK_COST_FREE is 1 when the cost through the ! 509: link is zero (i.e., the link makes the cost free). In other cases, ! 510: the adjustment to the cost is recomputed each time it is needed. */ ! 511: #define LINK_COST_ZERO(X) ((X)->jump) ! 512: #define LINK_COST_FREE(X) ((X)->call) ! 513: 1.1 root 514: /* For a SET rtx, SET_DEST is the place that is set 515: and SET_SRC is the value it is set to. */ 516: #define SET_DEST(RTX) ((RTX)->fld[0].rtx) 517: #define SET_SRC(RTX) ((RTX)->fld[1].rtx) 518: 519: /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */ 520: #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx) 521: 522: /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */ 523: #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging) 524: 525: /* Flag in a SYMBOL_REF for machine-specific purposes. */ 526: #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil) 527: 528: /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */ 529: #define SYMBOL_REF_USED(RTX) ((RTX)->used) 530: 531: /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn 532: of the function that is not involved in copying parameters to 533: pseudo-registers. FIRST_PARM_INSN is the very first insn of 534: the function, including the parameter copying. 535: We keep this around in case we must splice 536: this function into the assembly code at the end of the file. 537: FIRST_LABELNO is the first label number used by the function (inclusive). 538: LAST_LABELNO is the last label used by the function (exclusive). 539: MAX_REGNUM is the largest pseudo-register used by that function. 540: FUNCTION_ARGS_SIZE is the size of the argument block in the stack. 541: POPS_ARGS is the number of bytes of input arguments popped by the function 542: STACK_SLOT_LIST is the list of stack slots. 543: FUNCTION_FLAGS are where single-bit flags are saved. 544: OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list. 545: ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values 546: for the function arguments. 547: ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the 548: function. 549: 550: We want this to lay down like an INSN. The PREV_INSN field 551: is always NULL. The NEXT_INSN field always points to the 552: first function insn of the function being squirreled away. */ 553: 554: #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx) 555: #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx) 556: #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint) 557: #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint) 558: #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint) 559: #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint) 560: #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint) 561: #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint) 562: #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx) 563: #define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint) 564: #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint) 565: #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec) 566: #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx) 567: 568: /* In FUNCTION_FLAGS we save some variables computed when emitting the code 569: for the function and which must be `or'ed into the current flag values when 570: insns from that function are being inlined. */ 571: 572: /* These ought to be an enum, but non-ANSI compilers don't like that. */ 573: #define FUNCTION_FLAGS_CALLS_ALLOCA 01 574: #define FUNCTION_FLAGS_CALLS_SETJMP 02 575: #define FUNCTION_FLAGS_RETURNS_STRUCT 04 576: #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010 577: #define FUNCTION_FLAGS_NEEDS_CONTEXT 020 578: #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040 579: #define FUNCTION_FLAGS_RETURNS_POINTER 0100 580: #define FUNCTION_FLAGS_USES_CONST_POOL 0200 581: #define FUNCTION_FLAGS_CALLS_LONGJMP 0400 582: #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000 583: 584: /* Define a macro to look for REG_INC notes, 585: but save time on machines where they never exist. */ 586: 1.1.1.3 root 587: /* Don't continue this line--convex cc version 4.1 would lose. */ 588: #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT)) 1.1 root 589: #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg))) 590: #else 591: #define FIND_REG_INC_NOTE(insn, reg) 0 592: #endif 593: 594: /* Indicate whether the machine has any sort of auto increment addressing. 595: If not, we can avoid checking for REG_INC notes. */ 596: 1.1.1.3 root 597: /* Don't continue this line--convex cc version 4.1 would lose. */ 598: #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT)) 1.1 root 599: #define AUTO_INC_DEC 600: #endif 601: 602: /* Generally useful functions. */ 603: 1.1.1.4 ! root 604: /* The following functions accept a wide integer argument. Rather than ! 605: having to cast on every function call, we use a macro instead, that is ! 606: defined here and in tree.h. */ ! 607: ! 608: #ifndef exact_log2 ! 609: #define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N)) ! 610: #define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N)) ! 611: #endif ! 612: ! 613: #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C)) ! 614: ! 615: #define plus_constant_for_output(X,C) \ ! 616: plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C)) ! 617: ! 618: extern rtx plus_constant_wide PROTO((rtx, HOST_WIDE_INT)); ! 619: extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT)); ! 620: ! 621: #define GEN_INT(N) gen_rtx (CONST_INT, VOIDmode, (N)) ! 622: ! 623: #if 0 ! 624: /* We cannot define prototypes for the variable argument functions, ! 625: since they have not been ANSI-fied, and an ANSI compiler would ! 626: complain when compiling the definition of these functions. */ ! 627: ! 628: extern rtx gen_rtx PROTO((enum rtx_code, enum machine_mode, ...)); ! 629: extern rtvec gen_rtvec PROTO((int, ...)); ! 630: ! 631: #else 1.1 root 632: extern rtx gen_rtx (); 633: extern rtvec gen_rtvec (); 1.1.1.4 ! root 634: #endif ! 635: ! 636: #ifdef BUFSIZ /* stdio.h has been included */ ! 637: extern rtx read_rtx PROTO((FILE *)); ! 638: #else 1.1 root 639: extern rtx read_rtx (); 1.1.1.4 ! root 640: #endif ! 641: ! 642: #if 0 ! 643: /* At present, don't prototype xrealloc, since all of the callers don't ! 644: cast their pointers to char *, and all of the xrealloc's don't use ! 645: void * yet. */ ! 646: extern char *xrealloc PROTO((void *, unsigned)); ! 647: #else ! 648: extern char *xrealloc (); ! 649: #endif ! 650: ! 651: extern char *xmalloc PROTO((unsigned)); ! 652: extern char *oballoc PROTO((int)); ! 653: extern char *permalloc PROTO((int)); ! 654: extern void free PROTO((void *)); ! 655: extern rtx rtx_alloc PROTO((RTX_CODE)); ! 656: extern rtvec rtvec_alloc PROTO((int)); ! 657: extern rtx find_reg_note PROTO((rtx, enum reg_note, rtx)); ! 658: extern rtx find_regno_note PROTO((rtx, enum reg_note, int)); ! 659: extern HOST_WIDE_INT get_integer_term PROTO((rtx)); ! 660: extern rtx get_related_value PROTO((rtx)); ! 661: extern rtx single_set PROTO((rtx)); ! 662: extern rtx find_last_value PROTO((rtx, rtx *, rtx)); ! 663: extern rtx copy_rtx PROTO((rtx)); ! 664: extern rtx copy_rtx_if_shared PROTO((rtx)); ! 665: extern rtx copy_most_rtx PROTO((rtx, rtx)); ! 666: extern rtx replace_rtx PROTO((rtx, rtx, rtx)); ! 667: extern rtvec gen_rtvec_v PROTO((int, rtx *)); ! 668: extern rtx gen_reg_rtx PROTO((enum machine_mode)); ! 669: extern rtx gen_label_rtx PROTO((void)); ! 670: extern rtx gen_inline_header_rtx PROTO((rtx, rtx, int, int, int, int, int, int, rtx, int, int, rtvec, rtx)); ! 671: extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx)); ! 672: extern rtx gen_lowpart PROTO((enum machine_mode, rtx)); ! 673: extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx)); ! 674: extern rtx gen_highpart PROTO((enum machine_mode, rtx)); ! 675: extern rtx gen_realpart PROTO((enum machine_mode, rtx)); ! 676: extern rtx gen_imagpart PROTO((enum machine_mode, rtx)); ! 677: extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode)); ! 678: extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode)); ! 679: extern int subreg_lowpart_p PROTO((rtx)); ! 680: extern rtx make_safe_from PROTO((rtx, rtx)); ! 681: extern rtx memory_address PROTO((enum machine_mode, rtx)); ! 682: extern rtx get_insns PROTO((void)); ! 683: extern rtx get_last_insn PROTO((void)); ! 684: extern rtx get_last_insn_anywhere PROTO((void)); ! 685: extern void start_sequence PROTO((void)); ! 686: extern void push_to_sequence PROTO((rtx)); ! 687: extern void end_sequence PROTO((void)); ! 688: extern rtx gen_sequence PROTO((void)); ! 689: extern rtx immed_double_const PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode)); ! 690: extern rtx force_const_mem PROTO((enum machine_mode, rtx)); ! 691: extern rtx force_reg PROTO((enum machine_mode, rtx)); ! 692: extern rtx get_pool_constant PROTO((rtx)); ! 693: extern enum machine_mode get_pool_mode PROTO((rtx)); ! 694: extern int get_pool_offset PROTO((rtx)); ! 695: extern rtx simplify_subtraction PROTO((rtx)); ! 696: extern rtx assign_stack_local PROTO((enum machine_mode, int, int)); ! 697: extern rtx assign_stack_temp PROTO((enum machine_mode, int, int)); ! 698: extern rtx protect_from_queue PROTO((rtx, int)); ! 699: extern void emit_queue PROTO((void)); ! 700: extern rtx emit_move_insn PROTO((rtx, rtx)); ! 701: extern rtx emit_insn_before PROTO((rtx, rtx)); ! 702: extern rtx emit_jump_insn_before PROTO((rtx, rtx)); ! 703: extern rtx emit_call_insn_before PROTO((rtx, rtx)); ! 704: extern rtx emit_barrier_before PROTO((rtx)); ! 705: extern rtx emit_note_before PROTO((int, rtx)); ! 706: extern rtx emit_insn_after PROTO((rtx, rtx)); ! 707: extern rtx emit_jump_insn_after PROTO((rtx, rtx)); ! 708: extern rtx emit_barrier_after PROTO((rtx)); ! 709: extern rtx emit_label_after PROTO((rtx, rtx)); ! 710: extern rtx emit_note_after PROTO((int, rtx)); ! 711: extern rtx emit_line_note_after PROTO((char *, int, rtx)); ! 712: extern rtx emit_insn PROTO((rtx)); ! 713: extern rtx emit_insns PROTO((rtx)); ! 714: extern rtx emit_insns_before PROTO((rtx, rtx)); ! 715: extern rtx emit_jump_insn PROTO((rtx)); ! 716: extern rtx emit_call_insn PROTO((rtx)); ! 717: extern rtx emit_label PROTO((rtx)); ! 718: extern rtx emit_barrier PROTO((void)); ! 719: extern rtx emit_line_note PROTO((char *, int)); ! 720: extern rtx emit_note PROTO((char *, int)); ! 721: extern rtx emit_line_note_force PROTO((char *, int)); ! 722: extern rtx make_insn_raw PROTO((rtx)); ! 723: extern rtx previous_insn PROTO((rtx)); ! 724: extern rtx next_insn PROTO((rtx)); ! 725: extern rtx prev_nonnote_insn PROTO((rtx)); ! 726: extern rtx next_nonnote_insn PROTO((rtx)); ! 727: extern rtx prev_real_insn PROTO((rtx)); ! 728: extern rtx next_real_insn PROTO((rtx)); ! 729: extern rtx prev_active_insn PROTO((rtx)); ! 730: extern rtx next_active_insn PROTO((rtx)); ! 731: extern rtx prev_label PROTO((rtx)); ! 732: extern rtx next_label PROTO((rtx)); ! 733: extern rtx next_cc0_user PROTO((rtx)); ! 734: extern rtx prev_cc0_setter PROTO((rtx)); ! 735: extern rtx reg_set_last PROTO((rtx, rtx)); ! 736: extern rtx next_nondeleted_insn PROTO((rtx)); ! 737: extern enum rtx_code reverse_condition PROTO((enum rtx_code)); ! 738: extern enum rtx_code swap_condition PROTO((enum rtx_code)); ! 739: extern enum rtx_code unsigned_condition PROTO((enum rtx_code)); ! 740: extern enum rtx_code signed_condition PROTO((enum rtx_code)); ! 741: extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode)); ! 742: extern rtx squeeze_notes PROTO((rtx, rtx)); ! 743: extern rtx delete_insn PROTO((rtx)); ! 744: extern void delete_jump PROTO((rtx)); ! 745: extern rtx get_label_before PROTO((rtx)); ! 746: extern rtx get_label_after PROTO((rtx)); ! 747: extern rtx follow_jumps PROTO((rtx)); ! 748: extern rtx adj_offsettable_operand PROTO((rtx, int)); ! 749: extern rtx try_split PROTO((rtx, rtx, int)); ! 750: extern rtx split_insns PROTO((rtx, rtx)); ! 751: extern rtx simplify_unary_operation PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode)); ! 752: extern rtx simplify_binary_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx)); ! 753: extern rtx simplify_ternary_operation PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx)); ! 754: extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx)); ! 755: extern rtx nonlocal_label_rtx_list PROTO((void)); ! 756: extern rtx gen_move_insn PROTO((rtx, rtx)); ! 757: extern rtx gen_jump PROTO((rtx)); ! 758: extern rtx gen_beq PROTO((rtx)); ! 759: extern rtx gen_bge PROTO((rtx)); ! 760: extern rtx gen_ble PROTO((rtx)); ! 761: extern rtx eliminate_constant_term PROTO((rtx, rtx *)); ! 762: extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int)); 1.1 root 763: 764: /* Maximum number of parallel sets and clobbers in any insn in this fn. 765: Always at least 3, since the combiner could put that many togetherm 766: and we want this to remain correct for all the remaining passes. */ 767: 768: extern int max_parallel; 769: 1.1.1.4 ! root 770: extern int asm_noperands PROTO((rtx)); ! 771: extern char *decode_asm_operands PROTO((rtx, rtx *, rtx **, char **, enum machine_mode *)); 1.1 root 772: 1.1.1.4 ! root 773: extern enum reg_class reg_preferred_class PROTO((int)); ! 774: extern enum reg_class reg_alternate_class PROTO((int)); 1.1 root 775: 1.1.1.4 ! root 776: extern rtx get_first_nonparm_insn PROTO((void)); 1.1 root 777: 778: /* Standard pieces of rtx, to be substituted directly into things. */ 779: extern rtx pc_rtx; 780: extern rtx cc0_rtx; 781: extern rtx const0_rtx; 782: extern rtx const1_rtx; 783: extern rtx const2_rtx; 784: extern rtx constm1_rtx; 785: extern rtx const_true_rtx; 786: 787: extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE]; 788: 789: /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the 790: same as VOIDmode. */ 791: 792: #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)]) 793: 794: /* Likewise, for the constants 1 and 2. */ 795: 796: #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)]) 797: #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)]) 798: 799: /* All references to certain hard regs, except those created 800: by allocating pseudo regs into them (when that's possible), 801: go through these unique rtx objects. */ 802: extern rtx stack_pointer_rtx; 803: extern rtx frame_pointer_rtx; 804: extern rtx arg_pointer_rtx; 805: extern rtx pic_offset_table_rtx; 806: extern rtx struct_value_rtx; 807: extern rtx struct_value_incoming_rtx; 808: extern rtx static_chain_rtx; 809: extern rtx static_chain_incoming_rtx; 810: 811: /* Virtual registers are used during RTL generation to refer to locations into 812: the stack frame when the actual location isn't known until RTL generation 813: is complete. The routine instantiate_virtual_regs replaces these with 814: the proper value, which is normally {frame,arg,stack}_pointer_rtx plus 815: a constant. */ 816: 817: #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER) 818: 819: /* This points to the first word of the incoming arguments passed on the stack, 820: either by the caller or by the callee when pretending it was passed by the 821: caller. */ 822: 823: extern rtx virtual_incoming_args_rtx; 824: 825: #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER) 826: 827: /* If FRAME_GROWS_DOWNWARDS, this points to immediately above the first 828: variable on the stack. Otherwise, it points to the first variable on 829: the stack. */ 830: 831: extern rtx virtual_stack_vars_rtx; 832: 833: #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1) 834: 835: /* This points to the location of dynamically-allocated memory on the stack 836: immediately after the stack pointer has been adjusted by the amount 837: desired. */ 838: 839: extern rtx virtual_stack_dynamic_rtx; 840: 841: #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2) 842: 843: /* This points to the location in the stack at which outgoing arguments should 844: be written when the stack is pre-pushed (arguments pushed using push 845: insns always use sp). */ 846: 847: extern rtx virtual_outgoing_args_rtx; 848: 849: #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3) 850: 851: #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3) 852: 1.1.1.4 ! root 853: extern rtx find_next_ref PROTO((rtx, rtx)); ! 854: extern rtx *find_single_use PROTO((rtx, rtx, rtx *)); ! 855: ! 856: /* It is hard to write the prototype for expand_expr, since it needs ! 857: expr.h to be included for the enumeration. */ ! 858: ! 859: extern rtx expand_expr (); ! 860: extern rtx immed_real_const_1(); ! 861: ! 862: #ifdef TREE_CODE ! 863: /* rtl.h and tree.h were included. */ ! 864: extern rtx output_constant_def PROTO((tree)); ! 865: extern rtx immed_real_const PROTO((tree)); ! 866: extern rtx immed_real_const_1 PROTO((REAL_VALUE_TYPE, enum machine_mode)); ! 867: extern tree make_tree PROTO((tree, rtx)); ! 868: ! 869: #else ! 870: extern rtx output_constant_def (); ! 871: extern rtx immed_real_const (); ! 872: extern rtx immed_real_const_1 (); ! 873: #endif 1.1 root 874: 875: /* Define a default value for STORE_FLAG_VALUE. */ 876: 877: #ifndef STORE_FLAG_VALUE 878: #define STORE_FLAG_VALUE 1 879: #endif 880: 881: /* Nonzero after end of reload pass. 882: Set to 1 or 0 by toplev.c. */ 883: 884: extern int reload_completed; 885: 886: /* Set to 1 while reload_as_needed is operating. 887: Required by some machines to handle any generated moves differently. */ 888: 889: extern int reload_in_progress; 890: 891: /* If this is nonzero, we do not bother generating VOLATILE 892: around volatile memory references, and we are willing to 893: output indirect addresses. If cse is to follow, we reject 894: indirect addresses so a useful potential cse is generated; 895: if it is used only once, instruction combination will produce 896: the same indirect address eventually. */ 897: extern int cse_not_expected; 898: 899: /* Indexed by pseudo register number, gives the rtx for that pseudo. 900: Allocated in parallel with regno_pointer_flag. */ 901: extern rtx *regno_reg_rtx;
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