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comparison gcc/config/riscv/riscv-builtins.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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children 84e7813d76e9
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68:561a7518be6b 111:04ced10e8804
1 /* Subroutines used for expanding RISC-V builtins.
2 Copyright (C) 2011-2017 Free Software Foundation, Inc.
3 Contributed by Andrew Waterman (andrew@sifive.com).
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #include "config.h"
22 #include "system.h"
23 #include "coretypes.h"
24 #include "tm.h"
25 #include "rtl.h"
26 #include "tree.h"
27 #include "gimple-expr.h"
28 #include "memmodel.h"
29 #include "expmed.h"
30 #include "profile-count.h"
31 #include "optabs.h"
32 #include "recog.h"
33 #include "diagnostic-core.h"
34 #include "stor-layout.h"
35 #include "expr.h"
36 #include "langhooks.h"
37
38 /* Macros to create an enumeration identifier for a function prototype. */
39 #define RISCV_FTYPE_NAME1(A, B) RISCV_##A##_FTYPE_##B
40
41 /* Classifies the prototype of a built-in function. */
42 enum riscv_function_type {
43 #define DEF_RISCV_FTYPE(NARGS, LIST) RISCV_FTYPE_NAME##NARGS LIST,
44 #include "config/riscv/riscv-ftypes.def"
45 #undef DEF_RISCV_FTYPE
46 RISCV_MAX_FTYPE_MAX
47 };
48
49 /* Specifies how a built-in function should be converted into rtl. */
50 enum riscv_builtin_type {
51 /* The function corresponds directly to an .md pattern. */
52 RISCV_BUILTIN_DIRECT,
53
54 /* Likewise, but with return type VOID. */
55 RISCV_BUILTIN_DIRECT_NO_TARGET
56 };
57
58 /* Declare an availability predicate for built-in functions. */
59 #define AVAIL(NAME, COND) \
60 static unsigned int \
61 riscv_builtin_avail_##NAME (void) \
62 { \
63 return (COND); \
64 }
65
66 /* This structure describes a single built-in function. */
67 struct riscv_builtin_description {
68 /* The code of the main .md file instruction. See riscv_builtin_type
69 for more information. */
70 enum insn_code icode;
71
72 /* The name of the built-in function. */
73 const char *name;
74
75 /* Specifies how the function should be expanded. */
76 enum riscv_builtin_type builtin_type;
77
78 /* The function's prototype. */
79 enum riscv_function_type prototype;
80
81 /* Whether the function is available. */
82 unsigned int (*avail) (void);
83 };
84
85 AVAIL (hard_float, TARGET_HARD_FLOAT)
86
87 /* Construct a riscv_builtin_description from the given arguments.
88
89 INSN is the name of the associated instruction pattern, without the
90 leading CODE_FOR_riscv_.
91
92 NAME is the name of the function itself, without the leading
93 "__builtin_riscv_".
94
95 BUILTIN_TYPE and FUNCTION_TYPE are riscv_builtin_description fields.
96
97 AVAIL is the name of the availability predicate, without the leading
98 riscv_builtin_avail_. */
99 #define RISCV_BUILTIN(INSN, NAME, BUILTIN_TYPE, FUNCTION_TYPE, AVAIL) \
100 { CODE_FOR_riscv_ ## INSN, "__builtin_riscv_" NAME, \
101 BUILTIN_TYPE, FUNCTION_TYPE, riscv_builtin_avail_ ## AVAIL }
102
103 /* Define __builtin_riscv_<INSN>, which is a RISCV_BUILTIN_DIRECT function
104 mapped to instruction CODE_FOR_riscv_<INSN>, FUNCTION_TYPE and AVAIL
105 are as for RISCV_BUILTIN. */
106 #define DIRECT_BUILTIN(INSN, FUNCTION_TYPE, AVAIL) \
107 RISCV_BUILTIN (INSN, #INSN, RISCV_BUILTIN_DIRECT, FUNCTION_TYPE, AVAIL)
108
109 /* Define __builtin_riscv_<INSN>, which is a RISCV_BUILTIN_DIRECT_NO_TARGET
110 function mapped to instruction CODE_FOR_riscv_<INSN>, FUNCTION_TYPE
111 and AVAIL are as for RISCV_BUILTIN. */
112 #define DIRECT_NO_TARGET_BUILTIN(INSN, FUNCTION_TYPE, AVAIL) \
113 RISCV_BUILTIN (INSN, #INSN, RISCV_BUILTIN_DIRECT_NO_TARGET, \
114 FUNCTION_TYPE, AVAIL)
115
116 /* Argument types. */
117 #define RISCV_ATYPE_VOID void_type_node
118 #define RISCV_ATYPE_USI unsigned_intSI_type_node
119
120 /* RISCV_FTYPE_ATYPESN takes N RISCV_FTYPES-like type codes and lists
121 their associated RISCV_ATYPEs. */
122 #define RISCV_FTYPE_ATYPES1(A, B) \
123 RISCV_ATYPE_##A, RISCV_ATYPE_##B
124
125 static const struct riscv_builtin_description riscv_builtins[] = {
126 DIRECT_BUILTIN (frflags, RISCV_USI_FTYPE_VOID, hard_float),
127 DIRECT_NO_TARGET_BUILTIN (fsflags, RISCV_VOID_FTYPE_USI, hard_float)
128 };
129
130 /* Index I is the function declaration for riscv_builtins[I], or null if the
131 function isn't defined on this target. */
132 static GTY(()) tree riscv_builtin_decls[ARRAY_SIZE (riscv_builtins)];
133
134 /* Get the index I of the function declaration for riscv_builtin_decls[I]
135 using the instruction code or return null if not defined for the target. */
136 static GTY(()) int riscv_builtin_decl_index[NUM_INSN_CODES];
137
138 #define GET_BUILTIN_DECL(CODE) \
139 riscv_builtin_decls[riscv_builtin_decl_index[(CODE)]]
140
141 /* Return the function type associated with function prototype TYPE. */
142
143 static tree
144 riscv_build_function_type (enum riscv_function_type type)
145 {
146 static tree types[(int) RISCV_MAX_FTYPE_MAX];
147
148 if (types[(int) type] == NULL_TREE)
149 switch (type)
150 {
151 #define DEF_RISCV_FTYPE(NUM, ARGS) \
152 case RISCV_FTYPE_NAME##NUM ARGS: \
153 types[(int) type] \
154 = build_function_type_list (RISCV_FTYPE_ATYPES##NUM ARGS, \
155 NULL_TREE); \
156 break;
157 #include "config/riscv/riscv-ftypes.def"
158 #undef DEF_RISCV_FTYPE
159 default:
160 gcc_unreachable ();
161 }
162
163 return types[(int) type];
164 }
165
166 /* Implement TARGET_INIT_BUILTINS. */
167
168 void
169 riscv_init_builtins (void)
170 {
171 for (size_t i = 0; i < ARRAY_SIZE (riscv_builtins); i++)
172 {
173 const struct riscv_builtin_description *d = &riscv_builtins[i];
174 if (d->avail ())
175 {
176 tree type = riscv_build_function_type (d->prototype);
177 riscv_builtin_decls[i]
178 = add_builtin_function (d->name, type, i, BUILT_IN_MD, NULL, NULL);
179 riscv_builtin_decl_index[d->icode] = i;
180 }
181 }
182 }
183
184 /* Implement TARGET_BUILTIN_DECL. */
185
186 tree
187 riscv_builtin_decl (unsigned int code, bool initialize_p ATTRIBUTE_UNUSED)
188 {
189 if (code >= ARRAY_SIZE (riscv_builtins))
190 return error_mark_node;
191 return riscv_builtin_decls[code];
192 }
193
194 /* Take argument ARGNO from EXP's argument list and convert it into
195 an expand operand. Store the operand in *OP. */
196
197 static void
198 riscv_prepare_builtin_arg (struct expand_operand *op, tree exp, unsigned argno)
199 {
200 tree arg = CALL_EXPR_ARG (exp, argno);
201 create_input_operand (op, expand_normal (arg), TYPE_MODE (TREE_TYPE (arg)));
202 }
203
204 /* Expand instruction ICODE as part of a built-in function sequence.
205 Use the first NOPS elements of OPS as the instruction's operands.
206 HAS_TARGET_P is true if operand 0 is a target; it is false if the
207 instruction has no target.
208
209 Return the target rtx if HAS_TARGET_P, otherwise return const0_rtx. */
210
211 static rtx
212 riscv_expand_builtin_insn (enum insn_code icode, unsigned int n_ops,
213 struct expand_operand *ops, bool has_target_p)
214 {
215 if (!maybe_expand_insn (icode, n_ops, ops))
216 {
217 error ("invalid argument to built-in function");
218 return has_target_p ? gen_reg_rtx (ops[0].mode) : const0_rtx;
219 }
220
221 return has_target_p ? ops[0].value : const0_rtx;
222 }
223
224 /* Expand a RISCV_BUILTIN_DIRECT or RISCV_BUILTIN_DIRECT_NO_TARGET function;
225 HAS_TARGET_P says which. EXP is the CALL_EXPR that calls the function
226 and ICODE is the code of the associated .md pattern. TARGET, if nonnull,
227 suggests a good place to put the result. */
228
229 static rtx
230 riscv_expand_builtin_direct (enum insn_code icode, rtx target, tree exp,
231 bool has_target_p)
232 {
233 struct expand_operand ops[MAX_RECOG_OPERANDS];
234
235 /* Map any target to operand 0. */
236 int opno = 0;
237 if (has_target_p)
238 create_output_operand (&ops[opno++], target, TYPE_MODE (TREE_TYPE (exp)));
239
240 /* Map the arguments to the other operands. */
241 gcc_assert (opno + call_expr_nargs (exp)
242 == insn_data[icode].n_generator_args);
243 for (int argno = 0; argno < call_expr_nargs (exp); argno++)
244 riscv_prepare_builtin_arg (&ops[opno++], exp, argno);
245
246 return riscv_expand_builtin_insn (icode, opno, ops, has_target_p);
247 }
248
249 /* Implement TARGET_EXPAND_BUILTIN. */
250
251 rtx
252 riscv_expand_builtin (tree exp, rtx target, rtx subtarget ATTRIBUTE_UNUSED,
253 machine_mode mode ATTRIBUTE_UNUSED,
254 int ignore ATTRIBUTE_UNUSED)
255 {
256 tree fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0);
257 unsigned int fcode = DECL_FUNCTION_CODE (fndecl);
258 const struct riscv_builtin_description *d = &riscv_builtins[fcode];
259
260 switch (d->builtin_type)
261 {
262 case RISCV_BUILTIN_DIRECT:
263 return riscv_expand_builtin_direct (d->icode, target, exp, true);
264
265 case RISCV_BUILTIN_DIRECT_NO_TARGET:
266 return riscv_expand_builtin_direct (d->icode, target, exp, false);
267 }
268
269 gcc_unreachable ();
270 }
271
272 /* Implement TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
273
274 void
275 riscv_atomic_assign_expand_fenv (tree *hold, tree *clear, tree *update)
276 {
277 if (!TARGET_HARD_FLOAT)
278 return;
279
280 tree frflags = GET_BUILTIN_DECL (CODE_FOR_riscv_frflags);
281 tree fsflags = GET_BUILTIN_DECL (CODE_FOR_riscv_fsflags);
282 tree old_flags = create_tmp_var_raw (RISCV_ATYPE_USI);
283
284 *hold = build2 (MODIFY_EXPR, RISCV_ATYPE_USI, old_flags,
285 build_call_expr (frflags, 0));
286 *clear = build_call_expr (fsflags, 1, old_flags);
287 *update = NULL_TREE;
288 }