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1.1 ! root 1: /* This file contains the definitions and documentation for the ! 2: Register Transfer Expressions (rtx's) that make up the ! 3: Register Transfer Language (rtl) used in the Back End of the GNU compiler. ! 4: Copyright (C) 1987-1991 Free Software Foundation, Inc. ! 5: ! 6: This file is part of GNU CC. ! 7: ! 8: GNU CC is free software; you can redistribute it and/or modify ! 9: it under the terms of the GNU General Public License as published by ! 10: the Free Software Foundation; either version 2, or (at your option) ! 11: any later version. ! 12: ! 13: GNU CC is distributed in the hope that it will be useful, ! 14: but WITHOUT ANY WARRANTY; without even the implied warranty of ! 15: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ! 16: GNU General Public License for more details. ! 17: ! 18: You should have received a copy of the GNU General Public License ! 19: along with GNU CC; see the file COPYING. If not, write to ! 20: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ ! 21: ! 22: ! 23: /* Expression definitions and descriptions for all targets are in this file. ! 24: Some will not be used for some targets. ! 25: ! 26: The fields in the cpp macro call "DEF_RTL_EXPR()" ! 27: are used to create declarations in the C source of the compiler. ! 28: ! 29: The fields are: ! 30: ! 31: 1. The internal name of the rtx used in the C source. ! 32: It is a tag in the enumeration "enum rtx_code" defined in "rtl.h". ! 33: By convention these are in UPPER_CASE. ! 34: ! 35: 2. The name of the rtx in the external ASCII format read by ! 36: read_rtx(), and printed by print_rtx(). ! 37: These names are stored in rtx_name[]. ! 38: By convention these are the internal (field 1) names in lower_case. ! 39: ! 40: 3. The print format, and type of each rtx->fld[] (field) in this rtx. ! 41: These formats are stored in rtx_format[]. ! 42: The meaning of the formats is documented in front of this array in rtl.c ! 43: ! 44: 4. The class of the rtx. These are stored in rtx_class and are accessed ! 45: via the GET_RTX_CLASS macro. They are defined as follows: ! 46: ! 47: "o" an rtx code that can be used to represent an object (e.g, REG, MEM) ! 48: "<" an rtx code for a comparison (e.g, EQ, NE, LT) ! 49: "1" an rtx code for a unary arithmetic expression (e.g, NEG, NOT) ! 50: "c" an rtx code for a commutative binary operation (e.g,, PLUS, MULT) ! 51: "3" an rtx code for a non-bitfield three input operation (IF_THEN_ELSE) ! 52: "2" an rtx code for a non-commutative binary operation (e.g., MINUS, DIV) ! 53: "b" an rtx code for a bit-field operation (ZERO_EXTRACT, SIGN_EXTRACT) ! 54: "i" an rtx code for a machine insn (INSN, JUMP_INSN, CALL_INSN) ! 55: "m" an rtx code for something that matches in insns (e.g, MATCH_DUP) ! 56: "x" everything else ! 57: ! 58: */ ! 59: ! 60: /* --------------------------------------------------------------------- ! 61: Expressions (and "meta" expressions) used for structuring the ! 62: rtl representation of a program. ! 63: --------------------------------------------------------------------- */ ! 64: ! 65: /* an expression code name unknown to the reader */ ! 66: DEF_RTL_EXPR(UNKNOWN, "UnKnown", "*", 'x') ! 67: ! 68: /* (NIL) is used by rtl reader and printer to represent a null pointer. */ ! 69: ! 70: DEF_RTL_EXPR(NIL, "nil", "*", 'x') ! 71: ! 72: /* --------------------------------------------------------------------- ! 73: Expressions used in constructing lists. ! 74: --------------------------------------------------------------------- */ ! 75: ! 76: /* a linked list of expressions */ ! 77: DEF_RTL_EXPR(EXPR_LIST, "expr_list", "ee", 'x') ! 78: ! 79: /* a linked list of instructions. ! 80: The insns are represented in print by their uids. */ ! 81: DEF_RTL_EXPR(INSN_LIST, "insn_list", "ue", 'x') ! 82: ! 83: /* ---------------------------------------------------------------------- ! 84: Expression types for machine descripions. ! 85: These do not appear in actual rtl code in the compiler. ! 86: ---------------------------------------------------------------------- */ ! 87: ! 88: /* Appears only in machine descriptions. ! 89: Means use the function named by the second arg (the string) ! 90: as a predicate; if matched, store the structure that was matched ! 91: in the operand table at index specified by the first arg (the integer). ! 92: If the second arg is the null string, the structure is just stored. ! 93: ! 94: A third string argument indicates to the register allocator restrictions ! 95: on where the operand can be allocated. ! 96: ! 97: If the target needs no restriction on any instruction this field should ! 98: be the null string. ! 99: ! 100: The string is prepended by: ! 101: '=' to indicate the operand is only written to. ! 102: '+' to indicate the operand is both read and written to. ! 103: ! 104: Each character in the string represents an allocatable class for an operand. ! 105: 'g' indicates the operand can be any valid class. ! 106: 'i' indicates the operand can be immediate (in the instruction) data. ! 107: 'r' indicates the operand can be in a register. ! 108: 'm' indicates the operand can be in memory. ! 109: 'o' a subset of the 'm' class. Those memory addressing modes that ! 110: can be offset at compile time (have a constant added to them). ! 111: ! 112: Other characters indicate target dependent operand classes and ! 113: are described in each target's machine description. ! 114: ! 115: For instructions with more than one operand, sets of classes can be ! 116: separated by a comma to indicate the appropriate multi-operand constraints. ! 117: There must be a 1 to 1 correspondence between these sets of classes in ! 118: all operands for an instruction. ! 119: */ ! 120: DEF_RTL_EXPR(MATCH_OPERAND, "match_operand", "iss", 'm') ! 121: ! 122: /* Appears only in machine descriptions. ! 123: Means match a SCRATCH or a register. When used to generate rtl, a ! 124: SCRATCH is generated. As for MATCH_OPERAND, the mode specifies ! 125: the desired mode and the first argument is the operand number. ! 126: The second argument is the constraint. */ ! 127: DEF_RTL_EXPR(MATCH_SCRATCH, "match_scratch", "is", 'm') ! 128: ! 129: /* Appears only in machine descriptions. ! 130: Means match only something equal to what is stored in the operand table ! 131: at the index specified by the argument. */ ! 132: DEF_RTL_EXPR(MATCH_DUP, "match_dup", "i", 'm') ! 133: ! 134: /* Appears only in machine descriptions. ! 135: Means apply a predicate, AND match recursively the operands of the rtx. ! 136: Operand 0 is the operand-number, as in match_operand. ! 137: Operand 1 is a predicate to apply (as a string, a function name). ! 138: Operand 2 is a vector of expressions, each of which must match ! 139: one subexpression of the rtx this construct is matching. */ ! 140: DEF_RTL_EXPR(MATCH_OPERATOR, "match_operator", "isE", 'm') ! 141: ! 142: /* Appears only in machine descriptions. ! 143: Means to match a PARALLEL of arbitrary length. The predicate is applied ! 144: to the PARALLEL and the initial expressions in the PARALLEL are matched. ! 145: Operand 0 is the operand-number, as in match_operand. ! 146: Operand 1 is a predicate to apply to the PARALLEL. ! 147: Operand 2 is a vector of expressions, each of which must match the ! 148: corresponding element in the PARALLEL. */ ! 149: DEF_RTL_EXPR(MATCH_PARALLEL, "match_parallel", "isE", 'm') ! 150: ! 151: /* Appears only in machine descriptions. ! 152: Means match only something equal to what is stored in the operand table ! 153: at the index specified by the argument. For MATCH_OPERATOR. */ ! 154: DEF_RTL_EXPR(MATCH_OP_DUP, "match_op_dup", "iE", 'm') ! 155: ! 156: /* Appears only in machine descriptions. ! 157: Defines the pattern for one kind of instruction. ! 158: Operand: ! 159: 0: names this instruction. ! 160: If the name is the null string, the instruction is in the ! 161: machine description just to be recognized, and will never be emitted by ! 162: the tree to rtl expander. ! 163: 1: is the pattern. ! 164: 2: is a string which is a C expression ! 165: giving an additional condition for recognizing this pattern. ! 166: A null string means no extra condition. ! 167: 3: is the action to execute if this pattern is matched. ! 168: If this assembler code template starts with a * then it is a fragment of ! 169: C code to run to decide on a template to use. Otherwise, it is the ! 170: template to use. ! 171: 4: optionally, a vector of attributes for this insn. ! 172: */ ! 173: DEF_RTL_EXPR(DEFINE_INSN, "define_insn", "sEssV", 'x') ! 174: ! 175: /* Definition of a peephole optimization. ! 176: 1st operand: vector of insn patterns to match ! 177: 2nd operand: C expression that must be true ! 178: 3rd operand: template or C code to produce assembler output. ! 179: 4: optionally, a vector of attributes for this insn. ! 180: */ ! 181: DEF_RTL_EXPR(DEFINE_PEEPHOLE, "define_peephole", "EssV", 'x') ! 182: ! 183: /* Definition of a split operation. ! 184: 1st operand: insn pattern to match ! 185: 2nd operand: C expression that must be true ! 186: 3rd operand: vector of insn patterns to place into a SEQUENCE ! 187: 4th operand: optionally, some C code to execute before generating the ! 188: insns. This might, for example, create some RTX's and store them in ! 189: elements of `recog_operand' for use by the vector of insn-patterns. ! 190: (`operands' is an alias here for `recog_operand'). */ ! 191: DEF_RTL_EXPR(DEFINE_SPLIT, "define_split", "EsES", 'x') ! 192: ! 193: /* Definition of a combiner pattern. ! 194: Operands not defined yet. */ ! 195: DEF_RTL_EXPR(DEFINE_COMBINE, "define_combine", "Ess", 'x') ! 196: ! 197: /* Define how to generate multiple insns for a standard insn name. ! 198: 1st operand: the insn name. ! 199: 2nd operand: vector of insn-patterns. ! 200: Use match_operand to substitute an element of `recog_operand'. ! 201: 3rd operand: C expression that must be true for this to be available. ! 202: This may not test any operands. ! 203: 4th operand: Extra C code to execute before generating the insns. ! 204: This might, for example, create some RTX's and store them in ! 205: elements of `recog_operand' for use by the vector of insn-patterns. ! 206: (`operands' is an alias here for `recog_operand'). */ ! 207: DEF_RTL_EXPR(DEFINE_EXPAND, "define_expand", "sEss", 'x') ! 208: ! 209: /* Define a requirement for delay slots. ! 210: 1st operand: Condition involving insn attributes that, if true, ! 211: indicates that the insn requires the number of delay slots ! 212: shown. ! 213: 2nd operand: Vector whose length is the three times the number of delay ! 214: slots required. ! 215: Each entry gives three conditions, each involving attributes. ! 216: The first must be true for an insn to occupy that delay slot ! 217: location. The second is true for all insns that can be ! 218: annulled if the branch is true and the third is true for all ! 219: insns that can be annulled if the branch is false. ! 220: ! 221: Multiple DEFINE_DELAYs may be present. They indicate differing ! 222: requirements for delay slots. */ ! 223: DEF_RTL_EXPR(DEFINE_DELAY, "define_delay", "eE", 'x') ! 224: ! 225: /* Define a set of insns that requires a function unit. This means that ! 226: these insns produce their result after a delay and that there may be ! 227: restrictions on the number of insns of this type that can be scheduled ! 228: simultaneously. ! 229: ! 230: More than one DEFINE_FUNCTION_UNIT can be specified for a function unit. ! 231: Each gives a set of operations and associated delays. The first three ! 232: operands must be the same for each operation for the same function unit. ! 233: ! 234: All delays are specified in units of COST_PER_CYCLE. ! 235: ! 236: 1st operand: Name of function unit (mostly for documentation) ! 237: 2nd operand: Number of identical function units in CPU ! 238: 3rd operand: Total number of simultaneous insns that can execute on this ! 239: function unit; 0 if unlimited. ! 240: 4th operand: Condition involving insn attribute, that, if true, specifies ! 241: those insns that this expression applies to. ! 242: 5th operand: Constant delay after which insn result will be ! 243: available. ! 244: 6th operand: Delay until next insn can be scheduled on the function unit ! 245: executing this operation. The meaning depends on whether or ! 246: not the next operand is supplied. ! 247: 7th operand: If this operand is not specified, the 6th operand gives the ! 248: cost of scheduling another operation on this unit while a ! 249: previous one is active. A value of zero should be used for a ! 250: pipelined unit. If only one operation can be executed a time ! 251: and the unit is busy for the entire time, the 3rd operand ! 252: should be specified as 1 and the 6th and 7th operands will ! 253: be ignored. ! 254: ! 255: If this operand is specified, it is a list of attribute ! 256: expressions. If an insn for which any of these expressions ! 257: is true is currently executing on the function unit, the ! 258: delay will be given by the 6th operand. Otherwise, the ! 259: insn can be immediately scheduled (subject to the limit on ! 260: the number of simultaneous operations executing on the ! 261: unit.) */ ! 262: DEF_RTL_EXPR(DEFINE_FUNCTION_UNIT, "define_function_unit", "siieiiV", 'x') ! 263: ! 264: /* Define attribute computation for `asm' instructions. */ ! 265: DEF_RTL_EXPR(DEFINE_ASM_ATTRIBUTES, "define_asm_attributes", "V", 'x' ) ! 266: ! 267: /* SEQUENCE appears in the result of a `gen_...' function ! 268: for a DEFINE_EXPAND that wants to make several insns. ! 269: Its elements are the bodies of the insns that should be made. ! 270: `emit_insn' takes the SEQUENCE apart and makes separate insns. */ ! 271: DEF_RTL_EXPR(SEQUENCE, "sequence", "E", 'x') ! 272: ! 273: /* Refers to the address of its argument. ! 274: This appears only in machine descriptions, indicating that ! 275: any expression that would be acceptable as the operand of MEM ! 276: should be matched. */ ! 277: DEF_RTL_EXPR(ADDRESS, "address", "e", 'm') ! 278: ! 279: /* ---------------------------------------------------------------------- ! 280: Expressions used for insn attributes. These also do not appear in ! 281: actual rtl code in the compiler. ! 282: ---------------------------------------------------------------------- */ ! 283: ! 284: /* Definition of an insn attribute. ! 285: 1st operand: name of the attribute ! 286: 2nd operand: comma-separated list of possible attribute values ! 287: 3rd operand: expression for the default value of the attribute. */ ! 288: DEF_RTL_EXPR(DEFINE_ATTR, "define_attr", "sse", 'x') ! 289: ! 290: /* Marker for the name of an attribute. */ ! 291: DEF_RTL_EXPR(ATTR, "attr", "s", 'x') ! 292: ! 293: /* For use in the last (optional) operand of DEFINE_INSN or DEFINE_PEEPHOLE and ! 294: in DEFINE_ASM_INSN to specify an attribute to assign to insns matching that ! 295: pattern. ! 296: ! 297: (set_attr "name" "value") is equivalent to ! 298: (set (attr "name") (const_string "value")) */ ! 299: DEF_RTL_EXPR(SET_ATTR, "set_attr", "ss", 'x') ! 300: ! 301: /* In the last operand of DEFINE_INSN and DEFINE_PEEPHOLE, this can be used to ! 302: specify that attribute values are to be assigned according to the ! 303: alternative matched. ! 304: ! 305: The following three expressions are equivalent: ! 306: ! 307: (set (attr "att") (cond [(eq_attrq "alternative" "1") (const_string "a1") ! 308: (eq_attrq "alternative" "2") (const_string "a2")] ! 309: (const_string "a3"))) ! 310: (set_attr_alternative "att" [(const_string "a1") (const_string "a2") ! 311: (const_string "a3")]) ! 312: (set_attr "att" "a1,a2,a3") ! 313: */ ! 314: DEF_RTL_EXPR(SET_ATTR_ALTERNATIVE, "set_attr_alternative", "sE", 'x') ! 315: ! 316: /* A conditional expression true if the value of the specified attribute of ! 317: the current insn equals the specified value. The first operand is the ! 318: attribute name and the second is the comparison value. */ ! 319: DEF_RTL_EXPR(EQ_ATTR, "eq_attr", "ss", 'x') ! 320: ! 321: /* ---------------------------------------------------------------------- ! 322: Expression types used for things in the instruction chain. ! 323: ! 324: All formats must start with "iuu" to handle the chain. ! 325: Each insn expression holds an rtl instruction and its semantics ! 326: during back-end processing. ! 327: See macros's in "rtl.h" for the meaning of each rtx->fld[]. ! 328: ! 329: ---------------------------------------------------------------------- */ ! 330: ! 331: /* An instruction that cannot jump. */ ! 332: DEF_RTL_EXPR(INSN, "insn", "iuueiee", 'i') ! 333: ! 334: /* An instruction that can possibly jump. ! 335: Fields ( rtx->fld[] ) have exact same meaning as INSN's. */ ! 336: DEF_RTL_EXPR(JUMP_INSN, "jump_insn", "iuueiee0", 'i') ! 337: ! 338: /* An instruction that can possibly call a subroutine ! 339: but which will not change which instruction comes next ! 340: in the current function. ! 341: Fields ( rtx->fld[] ) have exact same meaning as INSN's. */ ! 342: DEF_RTL_EXPR(CALL_INSN, "call_insn", "iuueiee", 'i') ! 343: ! 344: /* A marker that indicates that control will not flow through. */ ! 345: DEF_RTL_EXPR(BARRIER, "barrier", "iuu", 'x') ! 346: ! 347: /* Holds a label that is followed by instructions. ! 348: Operand: ! 349: 3: is a number that is unique in the entire compilation. ! 350: 4: is the user-given name of the label, if any. ! 351: 5: is used in jump.c for the use-count of the label. ! 352: and in flow.c to point to the chain of label_ref's to this label. */ ! 353: DEF_RTL_EXPR(CODE_LABEL, "code_label", "iuuis0", 'x') ! 354: ! 355: /* Say where in the code a source line starts, for symbol table's sake. ! 356: Contains a filename and a line number. Line numbers <= 0 are special: ! 357: 0 is used in a dummy placed at the front of every function ! 358: just so there will never be a need to delete the first insn; ! 359: -1 indicates a dummy; insns to be deleted by flow analysis and combining ! 360: are really changed to NOTEs with a number of -1. ! 361: -2 means beginning of a name binding contour; output N_LBRAC. ! 362: -3 means end of a contour; output N_RBRAC. */ ! 363: DEF_RTL_EXPR(NOTE, "note", "iuusn", 'x') ! 364: ! 365: /* INLINE_HEADER is use by inline function machinery. The information ! 366: it contains helps to build the mapping function between the rtx's of ! 367: the function to be inlined and the current function being expanded. */ ! 368: ! 369: DEF_RTL_EXPR(INLINE_HEADER, "inline_header", "iuuuiiiiiieiiEe", 'x') ! 370: ! 371: /* ---------------------------------------------------------------------- ! 372: Top level constituents of INSN, JUMP_INSN and CALL_INSN. ! 373: ---------------------------------------------------------------------- */ ! 374: ! 375: /* Several operations to be done in parallel. */ ! 376: DEF_RTL_EXPR(PARALLEL, "parallel", "E", 'x') ! 377: ! 378: /* A string that is passed through to the assembler as input. ! 379: One can obviously pass comments through by using the ! 380: assembler comment syntax. ! 381: These occur in an insn all by themselves as the PATTERN. ! 382: They also appear inside an ASM_OPERANDS ! 383: as a convenient way to hold a string. */ ! 384: DEF_RTL_EXPR(ASM_INPUT, "asm_input", "s", 'x') ! 385: ! 386: /* An assembler instruction with operands. ! 387: 1st operand is the instruction template. ! 388: 2nd operand is the constraint for the output. ! 389: 3rd operand is the number of the output this expression refers to. ! 390: When an insn stores more than one value, a separate ASM_OPERANDS ! 391: is made for each output; this integer distinguishes them. ! 392: 4th is a vector of values of input operands. ! 393: 5th is a vector of modes and constraints for the input operands. ! 394: Each element is an ASM_INPUT containing a constraint string ! 395: and whose mode indicates the mode of the input operand. ! 396: 6th is the name of the containing source file. ! 397: 7th is the source line number. */ ! 398: DEF_RTL_EXPR(ASM_OPERANDS, "asm_operands", "ssiEEsi", 'x') ! 399: ! 400: /* A machine-specific operation. ! 401: 1st operand is a vector of operands being used by the operation so that ! 402: any needed reloads can be done. ! 403: 2nd operand is a unique value saying which of a number of machine-specific ! 404: operations is to be performed. ! 405: (Note that the vector must be the first operand because of the way that ! 406: genrecog.c record positions within an insn.) ! 407: This can occur all by itself in a PATTERN, as a component of a PARALLEL, ! 408: or inside an expression. */ ! 409: DEF_RTL_EXPR(UNSPEC, "unspec", "Ei", 'x') ! 410: ! 411: /* Similiar, but a volatile operation and one which may trap. */ ! 412: DEF_RTL_EXPR(UNSPEC_VOLATILE, "unspec_volatile", "Ei", 'x') ! 413: ! 414: /* Vector of addresses, stored as full words. */ ! 415: /* Each element is a LABEL_REF to a CODE_LABEL whose address we want. */ ! 416: DEF_RTL_EXPR(ADDR_VEC, "addr_vec", "E", 'x') ! 417: ! 418: /* Vector of address differences X0 - BASE, X1 - BASE, ... ! 419: First operand is BASE; the vector contains the X's. ! 420: The machine mode of this rtx says how much space to leave ! 421: for each difference. */ ! 422: DEF_RTL_EXPR(ADDR_DIFF_VEC, "addr_diff_vec", "eE", 'x') ! 423: ! 424: /* ---------------------------------------------------------------------- ! 425: At the top level of an instruction (perhaps under PARALLEL). ! 426: ---------------------------------------------------------------------- */ ! 427: ! 428: /* Assignment. ! 429: Operand 1 is the location (REG, MEM, PC, CC0 or whatever) assigned to. ! 430: Operand 2 is the value stored there. ! 431: ALL assignment must use SET. ! 432: Instructions that do multiple assignments must use multiple SET, ! 433: under PARALLEL. */ ! 434: DEF_RTL_EXPR(SET, "set", "ee", 'x') ! 435: ! 436: /* Indicate something is used in a way that we don't want to explain. ! 437: For example, subroutine calls will use the register ! 438: in which the static chain is passed. */ ! 439: DEF_RTL_EXPR(USE, "use", "e", 'x') ! 440: ! 441: /* Indicate something is clobbered in a way that we don't want to explain. ! 442: For example, subroutine calls will clobber some physical registers ! 443: (the ones that are by convention not saved). */ ! 444: DEF_RTL_EXPR(CLOBBER, "clobber", "e", 'x') ! 445: ! 446: /* Call a subroutine. ! 447: Operand 1 is the address to call. ! 448: Operand 2 is the number of arguments. */ ! 449: ! 450: DEF_RTL_EXPR(CALL, "call", "ee", 'x') ! 451: ! 452: /* Return from a subroutine. */ ! 453: ! 454: DEF_RTL_EXPR(RETURN, "return", "", 'x') ! 455: ! 456: /* Conditional trap. ! 457: Operand 1 is the condition. ! 458: Operand 2 is the trap code. ! 459: For an unconditional trap, make the condition (const_int 1). */ ! 460: DEF_RTL_EXPR(TRAP_IF, "trap_if", "ei", 'x') ! 461: ! 462: /* ---------------------------------------------------------------------- ! 463: Primitive values for use in expressions. ! 464: ---------------------------------------------------------------------- */ ! 465: ! 466: /* numeric integer constant */ ! 467: DEF_RTL_EXPR(CONST_INT, "const_int", "i", 'o') ! 468: ! 469: /* numeric double constant. ! 470: Operand 0 is the MEM that stores this constant in memory, ! 471: or various other things (see comments at immed_double_const in varasm.c). ! 472: Operand 1 is a chain of all CONST_DOUBLEs in use in the current function. ! 473: Remaining operands hold the actual value. ! 474: The number of operands may be more than 2 if cross-compiling; ! 475: see init_rtl. */ ! 476: DEF_RTL_EXPR(CONST_DOUBLE, "const_double", "e0ii", 'o') ! 477: ! 478: /* String constant. Used only for attributes right now. */ ! 479: DEF_RTL_EXPR(CONST_STRING, "const_string", "s", 'o') ! 480: ! 481: /* This is used to encapsulate an expression whose value is constant ! 482: (such as the sum of a SYMBOL_REF and a CONST_INT) so that it will be ! 483: recognized as a constant operand rather than by arithmetic instructions. */ ! 484: ! 485: DEF_RTL_EXPR(CONST, "const", "e", 'o') ! 486: ! 487: /* program counter. Ordinary jumps are represented ! 488: by a SET whose first operand is (PC). */ ! 489: DEF_RTL_EXPR(PC, "pc", "", 'o') ! 490: ! 491: /* A register. The "operand" is the register number, accessed ! 492: with the REGNO macro. If this number is less than FIRST_PSEUDO_REGISTER ! 493: than a hardware register is being referred to. */ ! 494: DEF_RTL_EXPR(REG, "reg", "i", 'o') ! 495: ! 496: /* A scratch register. This represents a register used only within a ! 497: single insn. It will be turned into a REG during register allocation ! 498: or reload unless the constraint indicates that the register won't be ! 499: needed, in which case it can remain a SCRATCH. This code is ! 500: marked as having one operand so it can be turned into a REG. */ ! 501: DEF_RTL_EXPR(SCRATCH, "scratch", "0", 'o') ! 502: ! 503: /* One word of a multi-word value. ! 504: The first operand is the complete value; the second says which word. ! 505: The WORDS_BIG_ENDIAN flag controls whether word number 0 ! 506: (as numbered in a SUBREG) is the most or least significant word. ! 507: ! 508: This is also used to refer to a value in a different machine mode. ! 509: For example, it can be used to refer to a SImode value as if it were ! 510: Qimode, or vice versa. Then the word number is always 0. */ ! 511: DEF_RTL_EXPR(SUBREG, "subreg", "ei", 'x') ! 512: ! 513: /* This one-argument rtx is used for move instructions ! 514: that are guaranteed to alter only the low part of a destination. ! 515: Thus, (SET (SUBREG:HI (REG...)) (MEM:HI ...)) ! 516: has an unspecified effect on the high part of REG, ! 517: but (SET (STRICT_LOW_PART (SUBREG:HI (REG...))) (MEM:HI ...)) ! 518: is guaranteed to alter only the bits of REG that are in HImode. ! 519: ! 520: The actual instruction used is probably the same in both cases, ! 521: but the register constraints may be tighter when STRICT_LOW_PART ! 522: is in use. */ ! 523: ! 524: DEF_RTL_EXPR(STRICT_LOW_PART, "strict_low_part", "e", 'x') ! 525: ! 526: /* A memory location; operand is the address. ! 527: Can be nested inside a VOLATILE. */ ! 528: DEF_RTL_EXPR(MEM, "mem", "e", 'o') ! 529: ! 530: /* Reference to an assembler label in the code for this function. ! 531: The operand is a CODE_LABEL found in the insn chain. ! 532: The unprinted fields 1 and 2 are used in flow.c for the ! 533: LABEL_NEXTREF and CONTAINING_INSN. */ ! 534: DEF_RTL_EXPR(LABEL_REF, "label_ref", "u00", 'o') ! 535: ! 536: /* Reference to a named label: the string that is the first operand, ! 537: with `_' added implicitly in front. ! 538: Exception: if the first character explicitly given is `*', ! 539: to give it to the assembler, remove the `*' and do not add `_'. */ ! 540: DEF_RTL_EXPR(SYMBOL_REF, "symbol_ref", "s", 'o') ! 541: ! 542: /* The condition code register is represented, in our imagination, ! 543: as a register holding a value that can be compared to zero. ! 544: In fact, the machine has already compared them and recorded the ! 545: results; but instructions that look at the condition code ! 546: pretend to be looking at the entire value and comparing it. */ ! 547: DEF_RTL_EXPR(CC0, "cc0", "", 'o') ! 548: ! 549: /* ===================================================================== ! 550: A QUEUED expression really points to a member of the queue of instructions ! 551: to be output later for postincrement/postdecrement. ! 552: QUEUED expressions never become part of instructions. ! 553: When a QUEUED expression would be put into an instruction, ! 554: instead either the incremented variable or a copy of its previous ! 555: value is used. ! 556: ! 557: Operands are: ! 558: 0. the variable to be incremented (a REG rtx). ! 559: 1. the incrementing instruction, or 0 if it hasn't been output yet. ! 560: 2. A REG rtx for a copy of the old value of the variable, or 0 if none yet. ! 561: 3. the body to use for the incrementing instruction ! 562: 4. the next QUEUED expression in the queue. ! 563: ====================================================================== */ ! 564: ! 565: DEF_RTL_EXPR(QUEUED, "queued", "eeeee", 'x') ! 566: ! 567: /* ---------------------------------------------------------------------- ! 568: Expressions for operators in an rtl pattern ! 569: ---------------------------------------------------------------------- */ ! 570: ! 571: /* if_then_else. This is used in representing ordinary ! 572: conditional jump instructions. ! 573: Operand: ! 574: 0: condition ! 575: 1: then expr ! 576: 2: else expr */ ! 577: DEF_RTL_EXPR(IF_THEN_ELSE, "if_then_else", "eee", '3') ! 578: ! 579: /* General conditional. The first operand is a vector composed of pairs of ! 580: expressions. The first element of each pair is evaluated, in turn. ! 581: The value of the conditional is the second expression of the first pair ! 582: whose first expression evaluates non-zero. If none of the expressions is ! 583: true, the second operand will be used as the value of the conditional. ! 584: ! 585: This should be replaced with use of IF_THEN_ELSE. */ ! 586: DEF_RTL_EXPR(COND, "cond", "Ee", 'x') ! 587: ! 588: /* Comparison, produces a condition code result. */ ! 589: DEF_RTL_EXPR(COMPARE, "compare", "ee", '2') ! 590: ! 591: /* plus */ ! 592: DEF_RTL_EXPR(PLUS, "plus", "ee", 'c') ! 593: ! 594: /* Operand 0 minus operand 1. */ ! 595: DEF_RTL_EXPR(MINUS, "minus", "ee", '2') ! 596: ! 597: /* Minus operand 0. */ ! 598: DEF_RTL_EXPR(NEG, "neg", "e", '1') ! 599: ! 600: DEF_RTL_EXPR(MULT, "mult", "ee", 'c') ! 601: ! 602: /* Operand 0 divided by operand 1. */ ! 603: DEF_RTL_EXPR(DIV, "div", "ee", '2') ! 604: /* Remainder of operand 0 divided by operand 1. */ ! 605: DEF_RTL_EXPR(MOD, "mod", "ee", '2') ! 606: ! 607: /* Unsigned divide and remainder. */ ! 608: DEF_RTL_EXPR(UDIV, "udiv", "ee", '2') ! 609: DEF_RTL_EXPR(UMOD, "umod", "ee", '2') ! 610: ! 611: /* Bitwise operations. */ ! 612: DEF_RTL_EXPR(AND, "and", "ee", 'c') ! 613: ! 614: DEF_RTL_EXPR(IOR, "ior", "ee", 'c') ! 615: ! 616: DEF_RTL_EXPR(XOR, "xor", "ee", 'c') ! 617: ! 618: DEF_RTL_EXPR(NOT, "not", "e", '1') ! 619: ! 620: /* Operand: ! 621: 0: value to be shifted. ! 622: 1: number of bits. ! 623: ASHIFT and LSHIFT are distinguished because on some machines ! 624: these allow a negative operand and shift right in that case. */ ! 625: DEF_RTL_EXPR(LSHIFT, "lshift", "ee", '2') ! 626: DEF_RTL_EXPR(ASHIFT, "ashift", "ee", '2') ! 627: DEF_RTL_EXPR(ROTATE, "rotate", "ee", '2') ! 628: ! 629: /* Right shift operations, for machines where these are not the same ! 630: as left shifting with a negative argument. */ ! 631: ! 632: DEF_RTL_EXPR(ASHIFTRT, "ashiftrt", "ee", '2') ! 633: DEF_RTL_EXPR(LSHIFTRT, "lshiftrt", "ee", '2') ! 634: DEF_RTL_EXPR(ROTATERT, "rotatert", "ee", '2') ! 635: ! 636: /* Minimum and maximum values of two operands. We need both signed and ! 637: unsigned forms. (We cannot use MIN for SMIN because it conflicts ! 638: with a macro of the same name.) */ ! 639: ! 640: DEF_RTL_EXPR(SMIN, "smin", "ee", 'c') ! 641: DEF_RTL_EXPR(SMAX, "smax", "ee", 'c') ! 642: DEF_RTL_EXPR(UMIN, "umin", "ee", 'c') ! 643: DEF_RTL_EXPR(UMAX, "umax", "ee", 'c') ! 644: ! 645: /* These unary operations are used to represent incrementation ! 646: and decrementation as they occur in memory addresses. ! 647: The amount of increment or decrement are not represented ! 648: because they can be understood from the machine-mode of the ! 649: containing MEM. These operations exist in only two cases: ! 650: 1. pushes onto the stack. ! 651: 2. created automatically by the life_analysis pass in flow.c. */ ! 652: DEF_RTL_EXPR(PRE_DEC, "pre_dec", "e", 'x') ! 653: DEF_RTL_EXPR(PRE_INC, "pre_inc", "e", 'x') ! 654: DEF_RTL_EXPR(POST_DEC, "post_dec", "e", 'x') ! 655: DEF_RTL_EXPR(POST_INC, "post_inc", "e", 'x') ! 656: ! 657: /* Comparison operations. The ordered comparisons exist in two ! 658: flavors, signed and unsigned. */ ! 659: DEF_RTL_EXPR(NE, "ne", "ee", '<') ! 660: DEF_RTL_EXPR(EQ, "eq", "ee", '<') ! 661: DEF_RTL_EXPR(GE, "ge", "ee", '<') ! 662: DEF_RTL_EXPR(GT, "gt", "ee", '<') ! 663: DEF_RTL_EXPR(LE, "le", "ee", '<') ! 664: DEF_RTL_EXPR(LT, "lt", "ee", '<') ! 665: DEF_RTL_EXPR(GEU, "geu", "ee", '<') ! 666: DEF_RTL_EXPR(GTU, "gtu", "ee", '<') ! 667: DEF_RTL_EXPR(LEU, "leu", "ee", '<') ! 668: DEF_RTL_EXPR(LTU, "ltu", "ee", '<') ! 669: ! 670: /* Represents the result of sign-extending the sole operand. ! 671: The machine modes of the operand and of the SIGN_EXTEND expression ! 672: determine how much sign-extension is going on. */ ! 673: DEF_RTL_EXPR(SIGN_EXTEND, "sign_extend", "e", '1') ! 674: ! 675: /* Similar for zero-extension (such as unsigned short to int). */ ! 676: DEF_RTL_EXPR(ZERO_EXTEND, "zero_extend", "e", '1') ! 677: ! 678: /* Similar but here the operand has a wider mode. */ ! 679: DEF_RTL_EXPR(TRUNCATE, "truncate", "e", '1') ! 680: ! 681: /* Similar for extending floating-point values (such as SFmode to DFmode). */ ! 682: DEF_RTL_EXPR(FLOAT_EXTEND, "float_extend", "e", '1') ! 683: DEF_RTL_EXPR(FLOAT_TRUNCATE, "float_truncate", "e", '1') ! 684: ! 685: /* Conversion of fixed point operand to floating point value. */ ! 686: DEF_RTL_EXPR(FLOAT, "float", "e", '1') ! 687: ! 688: /* With fixed-point machine mode: ! 689: Conversion of floating point operand to fixed point value. ! 690: Value is defined only when the operand's value is an integer. ! 691: With floating-point machine mode (and operand with same mode): ! 692: Operand is rounded toward zero to produce an integer value ! 693: represented in floating point. */ ! 694: DEF_RTL_EXPR(FIX, "fix", "e", '1') ! 695: ! 696: /* Conversion of unsigned fixed point operand to floating point value. */ ! 697: DEF_RTL_EXPR(UNSIGNED_FLOAT, "unsigned_float", "e", '1') ! 698: ! 699: /* With fixed-point machine mode: ! 700: Conversion of floating point operand to *unsigned* fixed point value. ! 701: Value is defined only when the operand's value is an integer. */ ! 702: DEF_RTL_EXPR(UNSIGNED_FIX, "unsigned_fix", "e", '1') ! 703: ! 704: /* Absolute value */ ! 705: DEF_RTL_EXPR(ABS, "abs", "e", '1') ! 706: ! 707: /* Square root */ ! 708: DEF_RTL_EXPR(SQRT, "sqrt", "e", '1') ! 709: ! 710: /* Find first bit that is set. ! 711: Value is 1 + number of trailing zeros in the arg., ! 712: or 0 if arg is 0. */ ! 713: DEF_RTL_EXPR(FFS, "ffs", "e", '1') ! 714: ! 715: /* Reference to a signed bit-field of specified size and position. ! 716: Operand 0 is the memory unit (usually SImode or QImode) which ! 717: contains the field's first bit. Operand 1 is the width, in bits. ! 718: Operand 2 is the number of bits in the memory unit before the ! 719: first bit of this field. ! 720: If BITS_BIG_ENDIAN is defined, the first bit is the msb and ! 721: operand 2 counts from the msb of the memory unit. ! 722: Otherwise, the first bit is the lsb and operand 2 counts from ! 723: the lsb of the memory unit. */ ! 724: DEF_RTL_EXPR(SIGN_EXTRACT, "sign_extract", "eee", 'b') ! 725: ! 726: /* Similar for unsigned bit-field. */ ! 727: DEF_RTL_EXPR(ZERO_EXTRACT, "zero_extract", "eee", 'b') ! 728: ! 729: /* For RISC machines. These save memory when splitting insns. */ ! 730: ! 731: /* HIGH are the high-order bits of a constant expression. */ ! 732: DEF_RTL_EXPR(HIGH, "high", "e", 'o') ! 733: ! 734: /* LO_SUM is the sum of a register and the low-order bits ! 735: of a constant expression. */ ! 736: DEF_RTL_EXPR(LO_SUM, "lo_sum", "ee", 'o') ! 737: ! 738: /* ! 739: Local variables: ! 740: mode:c ! 741: version-control: t ! 742: End: ! 743: */
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