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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. */
1.1.1.2 ! root 27: #define QUEUED_VAR(P) XEXP (P, 0)
1.1 root 28: /* If the increment has been emitted, this is the insn
29: that does the increment. It is zero before the increment is emitted. */
1.1.1.2 ! root 30: #define QUEUED_INSN(P) XEXP (P, 1)
1.1 root 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. */
1.1.1.2 ! root 33: #define QUEUED_COPY(P) XEXP (P, 2)
1.1 root 34: /* This is the body to use for the insn to do the increment.
35: It is used to emit the increment. */
1.1.1.2 ! root 36: #define QUEUED_BODY(P) XEXP (P, 3)
1.1 root 37: /* Next QUEUED in the queue. */
1.1.1.2 ! root 38: #define QUEUED_NEXT(P) XEXP (P, 4)
! 39:
! 40: /* This is the 4th arg to `expand_expr'.
! 41: EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
! 42: EXPND_CONST_ADDRESS means it is ok to return a MEM whose address
! 43: is a constant that is not a legitimate address. */
! 44: enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM, EXPAND_CONST_ADDRESS};
1.1 root 45:
46: /* If this is nonzero, we do not bother generating VOLATILE
47: around volatile memory references, and we are willing to
48: output indirect addresses. If cse is to follow, we reject
49: indirect addresses so a useful potential cse is generated;
50: if it is used only once, instruction combination will produce
51: the same indirect address eventually. */
52: extern int cse_not_expected;
53:
1.1.1.2 ! root 54: #ifdef TREE_CODE /* Don't lose if tree.h not included. */
! 55: /* Structure to record the size of a sequence of arguments
! 56: as the sum of a tree-expression and a constant. */
! 57:
! 58: struct args_size
! 59: {
! 60: int constant;
! 61: tree var;
! 62: };
! 63: #endif
! 64:
! 65: /* Add the value of the tree INC to the `struct args_size' TO. */
! 66:
! 67: #define ADD_PARM_SIZE(TO, INC) \
! 68: { tree inc = (INC); \
! 69: if (TREE_CODE (inc) == INTEGER_CST) \
! 70: (TO).constant += TREE_INT_CST_LOW (inc); \
! 71: else if ((TO).var == 0) \
! 72: (TO).var = inc; \
! 73: else \
! 74: (TO).var = genop (PLUS_EXPR, (TO).var, inc); }
! 75:
! 76: /* Convert the implicit sum in a `struct args_size' into an rtx. */
! 77: #define ARGS_SIZE_RTX(SIZE) \
! 78: ((SIZE).var == 0 ? gen_rtx (CONST_INT, VOIDmode, (SIZE).constant) \
! 79: : plus_constant (expand_expr ((SIZE).var, 0, VOIDmode, 0), \
! 80: (SIZE).constant))
! 81:
1.1 root 82: /* Optabs are tables saying how to generate insn bodies
83: for various machine modes and numbers of operands.
84: Each optab applies to one operation.
85: For example, add_optab applies to addition.
86:
87: The insn_code slot is the enum insn_code that says how to
88: generate an insn for this operation on a particular machine mode.
89: It is CODE_FOR_nothing if there is no such insn on the target machine.
90:
91: The `lib_call' slot is the name of the library function that
92: can be used to perform the operation.
93:
94: A few optabs, such as move_optab and cmp_optab, are used
95: by special code. */
96:
97: /* Everything that uses expr.h needs to define enum insn_code
98: but we don't list it in the Makefile dependencies just for that. */
99: #include "insn-codes.h"
100:
101: typedef struct optab
102: {
1.1.1.2 ! root 103: enum rtx_code code;
! 104: struct {
! 105: enum insn_code insn_code;
! 106: char *lib_call;
! 107: } handlers [NUM_MACHINE_MODES];
! 108: } * optab;
1.1 root 109:
110: /* Given an enum insn_code, access the function to construct
111: the body of that kind of insn. */
112: #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
113: extern rtx (*insn_gen_function[]) ();
114:
115: extern optab add_optab;
116: extern optab sub_optab;
117: extern optab smul_optab; /* Signed multiply */
118: extern optab umul_optab; /* Unsigned multiply */
119: extern optab smul_widen_optab; /* Signed multiply with result
120: one machine mode wider than args */
121: extern optab umul_widen_optab;
122: extern optab sdiv_optab; /* Signed divide */
123: extern optab sdivmod_optab; /* Signed divide-and-remainder in one */
124: extern optab udiv_optab;
125: extern optab udivmod_optab;
126: extern optab smod_optab; /* Signed remainder */
127: extern optab umod_optab;
128: extern optab flodiv_optab; /* Optab for floating divide. */
1.1.1.2 ! root 129: extern optab ftrunc_optab; /* Convert float to integer in float fmt */
1.1 root 130: extern optab and_optab; /* Logical and */
131: extern optab andcb_optab; /* Logical and with complement of 2nd arg */
132: extern optab ior_optab; /* Logical or */
133: extern optab xor_optab; /* Logical xor */
134: extern optab ashl_optab; /* Arithmetic shift left */
135: extern optab ashr_optab; /* Arithmetic shift right */
136: extern optab lshl_optab; /* Logical shift left */
137: extern optab lshr_optab; /* Logical shift right */
138: extern optab rotl_optab; /* Rotate left */
139: extern optab rotr_optab; /* Rotate right */
140:
141: extern optab mov_optab; /* Move instruction. */
142: extern optab movstrict_optab; /* Move, preserving high part of register. */
143:
144: extern optab cmp_optab; /* Compare insn; two operands. */
145: extern optab tst_optab; /* tst insn; compare one operand against 0 */
146:
147: /* Unary operations */
148: extern optab neg_optab; /* Negation */
149: extern optab abs_optab; /* Abs value */
150: extern optab one_cmpl_optab; /* Bitwise not */
1.1.1.2 ! root 151: extern optab ffs_optab; /* Find first bit set */
1.1 root 152:
153: /* Passed to expand_binop and expand_unop to say which options to try to use
154: if the requested operation can't be open-coded on the requisite mode.
155: Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
156: Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode. */
157:
158: enum optab_methods
159: {
160: OPTAB_DIRECT,
161: OPTAB_LIB,
162: OPTAB_WIDEN,
163: OPTAB_LIB_WIDEN,
164: };
165:
166: typedef rtx (*rtxfun) ();
167:
168: /* Expand a binary operation given optab and rtx operands. */
169: rtx expand_binop ();
170:
171: /* Expand a unary arithmetic operation given optab rtx operand. */
172: rtx expand_unop ();
173:
174: /* Initialize the tables that control conversion between fixed and
175: floating values. */
176: void init_fixtab ();
177: void init_floattab ();
178:
179: /* Say whether a certain floating machine mode can be converted to a certain
180: fixed machine mode. */
181: rtxfun can_fix_p ();
182: /* Similar for converting a fixed machine mode to a floating one. */
183: rtxfun can_float_p ();
184:
185: /* Generate code for a FIX_EXPR. */
186: void expand_fix ();
187:
188: /* Generate code for a FLOAT_EXPR. */
189: void expand_float ();
190:
191: /* Create but don't emit one rtl instruction to add one rtx into another.
192: Modes must match.
193: Likewise for subtraction and for just copying.
194: These do not call protect_from_queue; caller must do so. */
195: rtx gen_add2_insn ();
196: rtx gen_sub2_insn ();
197: rtx gen_move_insn ();
198:
199: /* Emit one rtl instruction to store zero in specified rtx. */
200: void emit_clr_insn ();
201:
202: /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
203: void emit_0_to_1_insn ();
204:
205: /* Emit one rtl insn to compare two rtx's. */
206: void emit_cmp_insn ();
207:
208: /* Emit some rtl insns to move data between rtx's, converting machine modes.
209: Both modes must be floating or both fixed. */
210: void convert_move ();
211:
212: /* Convert an rtx to specified machine mode and return the result. */
213: rtx convert_to_mode ();
214:
215: /* Emit code to push some arguments and call a library routine,
216: storing the value in a specified place. Calling sequence is
217: complicated. */
218: void emit_library_call ();
219:
220: /* Given an rtx that may include add and multiply operations,
221: generate them as insns and return a pseudo-reg containing the value.
222: Useful after calling expand_expr with 1 as sum_ok. */
223: rtx force_operand ();
224:
225: /* Return an rtx for the size in bytes of the value of an expr. */
226: rtx expr_size ();
227:
228: /* Return an rtx for the sum of an rtx and an integer. */
229: rtx plus_constant ();
230:
231: rtx lookup_static_chain ();
232:
233: /* Return an rtx like arg but sans any constant terms.
234: Returns the original rtx if it has no constant terms.
235: The constant terms are added and stored via a second arg. */
236: rtx eliminate_constant_term ();
237:
238: /* Convert arg to a valid memory address for specified machine mode,
239: by emitting insns to perform arithmetic if nec. */
240: rtx memory_address ();
241:
1.1.1.2 ! root 242: /* Return a memory reference like MEMREF, but with its mode changed
! 243: to MODE and its address changed to ADDR.
! 244: (VOIDmode means don't change the mode.
! 245: NULL for ADDR means don't change the address.) */
! 246: rtx change_address ();
1.1 root 247:
248: /* Return 1 if two rtx's are equivalent in structure and elements. */
249: int rtx_equal_p ();
250:
251: /* Given rtx, return new rtx whose address won't be affected by
252: any side effects. It has been copied to a new temporary reg. */
253: rtx stabilize ();
254:
255: /* Given an rtx, copy all regs it refers to into new temps
256: and return a modified copy that refers to the new temps. */
257: rtx copy_all_regs ();
258:
259: /* Copy given rtx to a new temp reg and return that. */
260: rtx copy_to_reg ();
261:
1.1.1.2 ! root 262: /* Like copy_to_reg but always make the reg Pmode. */
! 263: rtx copy_addr_to_reg ();
! 264:
! 265: /* Like copy_to_reg but always make the reg the specified mode MODE. */
! 266: rtx copy_to_mode_reg ();
! 267:
1.1 root 268: /* Copy given rtx to given temp reg and return that. */
269: rtx copy_to_suggested_reg ();
270:
1.1.1.2 ! root 271: /* Copy a value to a register if it isn't already a register.
! 272: Args are mode (in case value is a constant) and the value. */
! 273: rtx force_reg ();
! 274:
1.1 root 275: /* Return given rtx, copied into a new temp reg if it was in memory. */
276: rtx force_not_mem ();
277:
278: /* Remove some bytes from the stack. An rtx says how many. */
279: void adjust_stack ();
280:
281: /* Add some bytes to the stack. An rtx says how many. */
282: void anti_adjust_stack ();
283:
284: /* Emit code to copy function value to a new temp reg and return that reg. */
285: rtx function_value ();
286:
287: /* Return an rtx that refers to the value returned by a function
288: in its original home. This becomes invalid if any more code is emitted. */
289: rtx hard_function_value ();
290:
1.1.1.2 ! root 291: /* Return an rtx that refers to the value returned by a library call
! 292: in its original home. This becomes invalid if any more code is emitted. */
! 293: rtx hard_libcall_value ();
! 294:
1.1 root 295: /* Emit code to copy function value to a specified place. */
296: void copy_function_value ();
297:
1.1.1.2 ! root 298: /* Given an rtx, return an rtx for a value rounded up to a multiple
! 299: of STACK_BOUNDARY / BITS_PER_UNIT. */
! 300: rtx round_push ();
! 301:
1.1 root 302: rtx store_bit_field ();
303: rtx extract_bit_field ();
304: rtx expand_shift ();
305: rtx expand_bit_and ();
306: rtx expand_mult ();
307: rtx expand_divmod ();
308: rtx get_structure_value_addr ();
1.1.1.2 ! root 309: rtx expand_stmt_expr ();
! 310:
! 311: void jumpifnot ();
! 312: void jumpif ();
! 313: void do_jump ();
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