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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:
1.1.1.4 ! root 54: /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
! 55: So we can mark them all live at the end of the function, if stupid. */
! 56: extern rtx save_expr_regs;
! 57:
1.1.1.2 root 58: #ifdef TREE_CODE /* Don't lose if tree.h not included. */
59: /* Structure to record the size of a sequence of arguments
60: as the sum of a tree-expression and a constant. */
61:
62: struct args_size
63: {
64: int constant;
65: tree var;
66: };
67: #endif
68:
69: /* Add the value of the tree INC to the `struct args_size' TO. */
70:
71: #define ADD_PARM_SIZE(TO, INC) \
72: { tree inc = (INC); \
73: if (TREE_CODE (inc) == INTEGER_CST) \
74: (TO).constant += TREE_INT_CST_LOW (inc); \
75: else if ((TO).var == 0) \
76: (TO).var = inc; \
77: else \
78: (TO).var = genop (PLUS_EXPR, (TO).var, inc); }
79:
80: /* Convert the implicit sum in a `struct args_size' into an rtx. */
81: #define ARGS_SIZE_RTX(SIZE) \
82: ((SIZE).var == 0 ? gen_rtx (CONST_INT, VOIDmode, (SIZE).constant) \
83: : plus_constant (expand_expr ((SIZE).var, 0, VOIDmode, 0), \
84: (SIZE).constant))
85:
1.1 root 86: /* Optabs are tables saying how to generate insn bodies
87: for various machine modes and numbers of operands.
88: Each optab applies to one operation.
89: For example, add_optab applies to addition.
90:
91: The insn_code slot is the enum insn_code that says how to
92: generate an insn for this operation on a particular machine mode.
93: It is CODE_FOR_nothing if there is no such insn on the target machine.
94:
95: The `lib_call' slot is the name of the library function that
96: can be used to perform the operation.
97:
98: A few optabs, such as move_optab and cmp_optab, are used
99: by special code. */
100:
101: /* Everything that uses expr.h needs to define enum insn_code
102: but we don't list it in the Makefile dependencies just for that. */
103: #include "insn-codes.h"
104:
105: typedef struct optab
106: {
1.1.1.2 root 107: enum rtx_code code;
108: struct {
109: enum insn_code insn_code;
110: char *lib_call;
111: } handlers [NUM_MACHINE_MODES];
112: } * optab;
1.1 root 113:
114: /* Given an enum insn_code, access the function to construct
115: the body of that kind of insn. */
116: #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
117: extern rtx (*insn_gen_function[]) ();
118:
119: extern optab add_optab;
120: extern optab sub_optab;
121: extern optab smul_optab; /* Signed multiply */
122: extern optab umul_optab; /* Unsigned multiply */
123: extern optab smul_widen_optab; /* Signed multiply with result
124: one machine mode wider than args */
125: extern optab umul_widen_optab;
126: extern optab sdiv_optab; /* Signed divide */
127: extern optab sdivmod_optab; /* Signed divide-and-remainder in one */
128: extern optab udiv_optab;
129: extern optab udivmod_optab;
130: extern optab smod_optab; /* Signed remainder */
131: extern optab umod_optab;
132: extern optab flodiv_optab; /* Optab for floating divide. */
1.1.1.2 root 133: extern optab ftrunc_optab; /* Convert float to integer in float fmt */
1.1 root 134: extern optab and_optab; /* Logical and */
135: extern optab andcb_optab; /* Logical and with complement of 2nd arg */
136: extern optab ior_optab; /* Logical or */
137: extern optab xor_optab; /* Logical xor */
138: extern optab ashl_optab; /* Arithmetic shift left */
139: extern optab ashr_optab; /* Arithmetic shift right */
140: extern optab lshl_optab; /* Logical shift left */
141: extern optab lshr_optab; /* Logical shift right */
142: extern optab rotl_optab; /* Rotate left */
143: extern optab rotr_optab; /* Rotate right */
144:
145: extern optab mov_optab; /* Move instruction. */
146: extern optab movstrict_optab; /* Move, preserving high part of register. */
147:
148: extern optab cmp_optab; /* Compare insn; two operands. */
149: extern optab tst_optab; /* tst insn; compare one operand against 0 */
150:
151: /* Unary operations */
152: extern optab neg_optab; /* Negation */
153: extern optab abs_optab; /* Abs value */
154: extern optab one_cmpl_optab; /* Bitwise not */
1.1.1.2 root 155: extern optab ffs_optab; /* Find first bit set */
1.1 root 156:
157: /* Passed to expand_binop and expand_unop to say which options to try to use
158: if the requested operation can't be open-coded on the requisite mode.
159: Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
160: Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode. */
161:
162: enum optab_methods
163: {
164: OPTAB_DIRECT,
165: OPTAB_LIB,
166: OPTAB_WIDEN,
167: OPTAB_LIB_WIDEN,
168: };
169:
170: typedef rtx (*rtxfun) ();
171:
172: /* Expand a binary operation given optab and rtx operands. */
173: rtx expand_binop ();
174:
175: /* Expand a unary arithmetic operation given optab rtx operand. */
176: rtx expand_unop ();
177:
178: /* Initialize the tables that control conversion between fixed and
179: floating values. */
180: void init_fixtab ();
181: void init_floattab ();
182:
183: /* Say whether a certain floating machine mode can be converted to a certain
184: fixed machine mode. */
185: rtxfun can_fix_p ();
186: /* Similar for converting a fixed machine mode to a floating one. */
187: rtxfun can_float_p ();
188:
189: /* Generate code for a FIX_EXPR. */
190: void expand_fix ();
191:
192: /* Generate code for a FLOAT_EXPR. */
193: void expand_float ();
194:
195: /* Create but don't emit one rtl instruction to add one rtx into another.
196: Modes must match.
197: Likewise for subtraction and for just copying.
198: These do not call protect_from_queue; caller must do so. */
199: rtx gen_add2_insn ();
200: rtx gen_sub2_insn ();
201: rtx gen_move_insn ();
202:
203: /* Emit one rtl instruction to store zero in specified rtx. */
204: void emit_clr_insn ();
205:
206: /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
207: void emit_0_to_1_insn ();
208:
209: /* Emit one rtl insn to compare two rtx's. */
210: void emit_cmp_insn ();
211:
212: /* Emit some rtl insns to move data between rtx's, converting machine modes.
213: Both modes must be floating or both fixed. */
214: void convert_move ();
215:
216: /* Convert an rtx to specified machine mode and return the result. */
217: rtx convert_to_mode ();
218:
219: /* Emit code to push some arguments and call a library routine,
220: storing the value in a specified place. Calling sequence is
221: complicated. */
222: void emit_library_call ();
223:
224: /* Given an rtx that may include add and multiply operations,
225: generate them as insns and return a pseudo-reg containing the value.
226: Useful after calling expand_expr with 1 as sum_ok. */
227: rtx force_operand ();
228:
229: /* Return an rtx for the size in bytes of the value of an expr. */
230: rtx expr_size ();
231:
232: /* Return an rtx for the sum of an rtx and an integer. */
233: rtx plus_constant ();
234:
235: rtx lookup_static_chain ();
236:
237: /* Return an rtx like arg but sans any constant terms.
238: Returns the original rtx if it has no constant terms.
239: The constant terms are added and stored via a second arg. */
240: rtx eliminate_constant_term ();
241:
242: /* Convert arg to a valid memory address for specified machine mode,
243: by emitting insns to perform arithmetic if nec. */
244: rtx memory_address ();
245:
1.1.1.3 root 246: /* Like `memory_address' but pretent `flag_force_addr' is 0. */
247: rtx memory_address_noforce ();
248:
1.1.1.2 root 249: /* Return a memory reference like MEMREF, but with its mode changed
250: to MODE and its address changed to ADDR.
251: (VOIDmode means don't change the mode.
252: NULL for ADDR means don't change the address.) */
253: rtx change_address ();
1.1 root 254:
255: /* Return 1 if two rtx's are equivalent in structure and elements. */
256: int rtx_equal_p ();
257:
258: /* Given rtx, return new rtx whose address won't be affected by
259: any side effects. It has been copied to a new temporary reg. */
260: rtx stabilize ();
261:
262: /* Given an rtx, copy all regs it refers to into new temps
263: and return a modified copy that refers to the new temps. */
264: rtx copy_all_regs ();
265:
266: /* Copy given rtx to a new temp reg and return that. */
267: rtx copy_to_reg ();
268:
1.1.1.2 root 269: /* Like copy_to_reg but always make the reg Pmode. */
270: rtx copy_addr_to_reg ();
271:
272: /* Like copy_to_reg but always make the reg the specified mode MODE. */
273: rtx copy_to_mode_reg ();
274:
1.1 root 275: /* Copy given rtx to given temp reg and return that. */
276: rtx copy_to_suggested_reg ();
277:
1.1.1.2 root 278: /* Copy a value to a register if it isn't already a register.
279: Args are mode (in case value is a constant) and the value. */
280: rtx force_reg ();
281:
1.1 root 282: /* Return given rtx, copied into a new temp reg if it was in memory. */
283: rtx force_not_mem ();
284:
285: /* Remove some bytes from the stack. An rtx says how many. */
286: void adjust_stack ();
287:
288: /* Add some bytes to the stack. An rtx says how many. */
289: void anti_adjust_stack ();
290:
291: /* Emit code to copy function value to a new temp reg and return that reg. */
292: rtx function_value ();
293:
294: /* Return an rtx that refers to the value returned by a function
295: in its original home. This becomes invalid if any more code is emitted. */
296: rtx hard_function_value ();
297:
1.1.1.2 root 298: /* Return an rtx that refers to the value returned by a library call
299: in its original home. This becomes invalid if any more code is emitted. */
300: rtx hard_libcall_value ();
301:
1.1 root 302: /* Emit code to copy function value to a specified place. */
303: void copy_function_value ();
304:
1.1.1.2 root 305: /* Given an rtx, return an rtx for a value rounded up to a multiple
306: of STACK_BOUNDARY / BITS_PER_UNIT. */
307: rtx round_push ();
308:
1.1 root 309: rtx store_bit_field ();
310: rtx extract_bit_field ();
311: rtx expand_shift ();
312: rtx expand_bit_and ();
313: rtx expand_mult ();
314: rtx expand_divmod ();
315: rtx get_structure_value_addr ();
1.1.1.2 root 316: rtx expand_stmt_expr ();
317:
318: void jumpifnot ();
319: void jumpif ();
320: void do_jump ();
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