Mercurial > hg > CbC > CbC_gcc
annotate gcc/convert.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Fri, 12 Feb 2010 23:39:51 +0900 |
parents | 58ad6c70ea60 |
children | b7f97abdc517 |
rev | line source |
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0 | 1 /* Utility routines for data type conversion for GCC. |
2 Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997, 1998, | |
3 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 | |
4 Free Software Foundation, Inc. | |
5 | |
6 This file is part of GCC. | |
7 | |
8 GCC is free software; you can redistribute it and/or modify it under | |
9 the terms of the GNU General Public License as published by the Free | |
10 Software Foundation; either version 3, or (at your option) any later | |
11 version. | |
12 | |
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
19 along with GCC; see the file COPYING3. If not see | |
20 <http://www.gnu.org/licenses/>. */ | |
21 | |
22 | |
23 /* These routines are somewhat language-independent utility function | |
24 intended to be called by the language-specific convert () functions. */ | |
25 | |
26 #include "config.h" | |
27 #include "system.h" | |
28 #include "coretypes.h" | |
29 #include "tm.h" | |
30 #include "tree.h" | |
31 #include "flags.h" | |
32 #include "convert.h" | |
33 #include "toplev.h" | |
34 #include "langhooks.h" | |
35 #include "real.h" | |
36 #include "fixed-value.h" | |
37 | |
38 /* Convert EXPR to some pointer or reference type TYPE. | |
39 EXPR must be pointer, reference, integer, enumeral, or literal zero; | |
40 in other cases error is called. */ | |
41 | |
42 tree | |
43 convert_to_pointer (tree type, tree expr) | |
44 { | |
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45 location_t loc = EXPR_LOCATION (expr); |
0 | 46 if (TREE_TYPE (expr) == type) |
47 return expr; | |
48 | |
49 /* Propagate overflow to the NULL pointer. */ | |
50 if (integer_zerop (expr)) | |
51 return force_fit_type_double (type, 0, 0, 0, TREE_OVERFLOW (expr)); | |
52 | |
53 switch (TREE_CODE (TREE_TYPE (expr))) | |
54 { | |
55 case POINTER_TYPE: | |
56 case REFERENCE_TYPE: | |
55
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57 { |
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58 /* If the pointers point to different address spaces, conversion needs |
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59 to be done via a ADDR_SPACE_CONVERT_EXPR instead of a NOP_EXPR. */ |
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60 addr_space_t to_as = TYPE_ADDR_SPACE (TREE_TYPE (type)); |
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61 addr_space_t from_as = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (expr))); |
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62 |
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63 if (to_as == from_as) |
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64 return fold_build1_loc (loc, NOP_EXPR, type, expr); |
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65 else |
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66 return fold_build1_loc (loc, ADDR_SPACE_CONVERT_EXPR, type, expr); |
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67 } |
0 | 68 |
69 case INTEGER_TYPE: | |
70 case ENUMERAL_TYPE: | |
71 case BOOLEAN_TYPE: | |
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72 { |
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73 /* If the input precision differs from the target pointer type |
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74 precision, first convert the input expression to an integer type of |
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75 the target precision. Some targets, e.g. VMS, need several pointer |
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76 sizes to coexist so the latter isn't necessarily POINTER_SIZE. */ |
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77 unsigned int pprec = TYPE_PRECISION (type); |
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78 unsigned int eprec = TYPE_PRECISION (TREE_TYPE (expr)); |
0 | 79 |
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80 if (eprec != pprec) |
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81 expr = fold_build1_loc (loc, NOP_EXPR, |
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82 lang_hooks.types.type_for_size (pprec, 0), |
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83 expr); |
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84 } |
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85 |
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86 return fold_build1_loc (loc, CONVERT_EXPR, type, expr); |
0 | 87 |
88 default: | |
89 error ("cannot convert to a pointer type"); | |
90 return convert_to_pointer (type, integer_zero_node); | |
91 } | |
92 } | |
93 | |
94 /* Avoid any floating point extensions from EXP. */ | |
95 tree | |
96 strip_float_extensions (tree exp) | |
97 { | |
98 tree sub, expt, subt; | |
99 | |
100 /* For floating point constant look up the narrowest type that can hold | |
101 it properly and handle it like (type)(narrowest_type)constant. | |
102 This way we can optimize for instance a=a*2.0 where "a" is float | |
103 but 2.0 is double constant. */ | |
104 if (TREE_CODE (exp) == REAL_CST && !DECIMAL_FLOAT_TYPE_P (TREE_TYPE (exp))) | |
105 { | |
106 REAL_VALUE_TYPE orig; | |
107 tree type = NULL; | |
108 | |
109 orig = TREE_REAL_CST (exp); | |
110 if (TYPE_PRECISION (TREE_TYPE (exp)) > TYPE_PRECISION (float_type_node) | |
111 && exact_real_truncate (TYPE_MODE (float_type_node), &orig)) | |
112 type = float_type_node; | |
113 else if (TYPE_PRECISION (TREE_TYPE (exp)) | |
114 > TYPE_PRECISION (double_type_node) | |
115 && exact_real_truncate (TYPE_MODE (double_type_node), &orig)) | |
116 type = double_type_node; | |
117 if (type) | |
118 return build_real (type, real_value_truncate (TYPE_MODE (type), orig)); | |
119 } | |
120 | |
121 if (!CONVERT_EXPR_P (exp)) | |
122 return exp; | |
123 | |
124 sub = TREE_OPERAND (exp, 0); | |
125 subt = TREE_TYPE (sub); | |
126 expt = TREE_TYPE (exp); | |
127 | |
128 if (!FLOAT_TYPE_P (subt)) | |
129 return exp; | |
130 | |
131 if (DECIMAL_FLOAT_TYPE_P (expt) != DECIMAL_FLOAT_TYPE_P (subt)) | |
132 return exp; | |
133 | |
134 if (TYPE_PRECISION (subt) > TYPE_PRECISION (expt)) | |
135 return exp; | |
136 | |
137 return strip_float_extensions (sub); | |
138 } | |
139 | |
140 | |
141 /* Convert EXPR to some floating-point type TYPE. | |
142 | |
143 EXPR must be float, fixed-point, integer, or enumeral; | |
144 in other cases error is called. */ | |
145 | |
146 tree | |
147 convert_to_real (tree type, tree expr) | |
148 { | |
149 enum built_in_function fcode = builtin_mathfn_code (expr); | |
150 tree itype = TREE_TYPE (expr); | |
151 | |
152 /* Disable until we figure out how to decide whether the functions are | |
153 present in runtime. */ | |
154 /* Convert (float)sqrt((double)x) where x is float into sqrtf(x) */ | |
155 if (optimize | |
156 && (TYPE_MODE (type) == TYPE_MODE (double_type_node) | |
157 || TYPE_MODE (type) == TYPE_MODE (float_type_node))) | |
158 { | |
159 switch (fcode) | |
160 { | |
161 #define CASE_MATHFN(FN) case BUILT_IN_##FN: case BUILT_IN_##FN##L: | |
162 CASE_MATHFN (COSH) | |
163 CASE_MATHFN (EXP) | |
164 CASE_MATHFN (EXP10) | |
165 CASE_MATHFN (EXP2) | |
166 CASE_MATHFN (EXPM1) | |
167 CASE_MATHFN (GAMMA) | |
168 CASE_MATHFN (J0) | |
169 CASE_MATHFN (J1) | |
170 CASE_MATHFN (LGAMMA) | |
171 CASE_MATHFN (POW10) | |
172 CASE_MATHFN (SINH) | |
173 CASE_MATHFN (TGAMMA) | |
174 CASE_MATHFN (Y0) | |
175 CASE_MATHFN (Y1) | |
176 /* The above functions may set errno differently with float | |
177 input or output so this transformation is not safe with | |
178 -fmath-errno. */ | |
179 if (flag_errno_math) | |
180 break; | |
181 CASE_MATHFN (ACOS) | |
182 CASE_MATHFN (ACOSH) | |
183 CASE_MATHFN (ASIN) | |
184 CASE_MATHFN (ASINH) | |
185 CASE_MATHFN (ATAN) | |
186 CASE_MATHFN (ATANH) | |
187 CASE_MATHFN (CBRT) | |
188 CASE_MATHFN (COS) | |
189 CASE_MATHFN (ERF) | |
190 CASE_MATHFN (ERFC) | |
191 CASE_MATHFN (FABS) | |
192 CASE_MATHFN (LOG) | |
193 CASE_MATHFN (LOG10) | |
194 CASE_MATHFN (LOG2) | |
195 CASE_MATHFN (LOG1P) | |
196 CASE_MATHFN (LOGB) | |
197 CASE_MATHFN (SIN) | |
198 CASE_MATHFN (SQRT) | |
199 CASE_MATHFN (TAN) | |
200 CASE_MATHFN (TANH) | |
201 #undef CASE_MATHFN | |
202 { | |
203 tree arg0 = strip_float_extensions (CALL_EXPR_ARG (expr, 0)); | |
204 tree newtype = type; | |
205 | |
206 /* We have (outertype)sqrt((innertype)x). Choose the wider mode from | |
207 the both as the safe type for operation. */ | |
208 if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (type)) | |
209 newtype = TREE_TYPE (arg0); | |
210 | |
211 /* Be careful about integer to fp conversions. | |
212 These may overflow still. */ | |
213 if (FLOAT_TYPE_P (TREE_TYPE (arg0)) | |
214 && TYPE_PRECISION (newtype) < TYPE_PRECISION (itype) | |
215 && (TYPE_MODE (newtype) == TYPE_MODE (double_type_node) | |
216 || TYPE_MODE (newtype) == TYPE_MODE (float_type_node))) | |
217 { | |
218 tree fn = mathfn_built_in (newtype, fcode); | |
219 | |
220 if (fn) | |
221 { | |
222 tree arg = fold (convert_to_real (newtype, arg0)); | |
223 expr = build_call_expr (fn, 1, arg); | |
224 if (newtype == type) | |
225 return expr; | |
226 } | |
227 } | |
228 } | |
229 default: | |
230 break; | |
231 } | |
232 } | |
233 if (optimize | |
234 && (((fcode == BUILT_IN_FLOORL | |
235 || fcode == BUILT_IN_CEILL | |
236 || fcode == BUILT_IN_ROUNDL | |
237 || fcode == BUILT_IN_RINTL | |
238 || fcode == BUILT_IN_TRUNCL | |
239 || fcode == BUILT_IN_NEARBYINTL) | |
240 && (TYPE_MODE (type) == TYPE_MODE (double_type_node) | |
241 || TYPE_MODE (type) == TYPE_MODE (float_type_node))) | |
242 || ((fcode == BUILT_IN_FLOOR | |
243 || fcode == BUILT_IN_CEIL | |
244 || fcode == BUILT_IN_ROUND | |
245 || fcode == BUILT_IN_RINT | |
246 || fcode == BUILT_IN_TRUNC | |
247 || fcode == BUILT_IN_NEARBYINT) | |
248 && (TYPE_MODE (type) == TYPE_MODE (float_type_node))))) | |
249 { | |
250 tree fn = mathfn_built_in (type, fcode); | |
251 | |
252 if (fn) | |
253 { | |
254 tree arg = strip_float_extensions (CALL_EXPR_ARG (expr, 0)); | |
255 | |
256 /* Make sure (type)arg0 is an extension, otherwise we could end up | |
257 changing (float)floor(double d) into floorf((float)d), which is | |
258 incorrect because (float)d uses round-to-nearest and can round | |
259 up to the next integer. */ | |
260 if (TYPE_PRECISION (type) >= TYPE_PRECISION (TREE_TYPE (arg))) | |
261 return build_call_expr (fn, 1, fold (convert_to_real (type, arg))); | |
262 } | |
263 } | |
264 | |
265 /* Propagate the cast into the operation. */ | |
266 if (itype != type && FLOAT_TYPE_P (type)) | |
267 switch (TREE_CODE (expr)) | |
268 { | |
269 /* Convert (float)-x into -(float)x. This is safe for | |
270 round-to-nearest rounding mode. */ | |
271 case ABS_EXPR: | |
272 case NEGATE_EXPR: | |
273 if (!flag_rounding_math | |
274 && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr))) | |
275 return build1 (TREE_CODE (expr), type, | |
276 fold (convert_to_real (type, | |
277 TREE_OPERAND (expr, 0)))); | |
278 break; | |
279 /* Convert (outertype)((innertype0)a+(innertype1)b) | |
280 into ((newtype)a+(newtype)b) where newtype | |
281 is the widest mode from all of these. */ | |
282 case PLUS_EXPR: | |
283 case MINUS_EXPR: | |
284 case MULT_EXPR: | |
285 case RDIV_EXPR: | |
286 { | |
287 tree arg0 = strip_float_extensions (TREE_OPERAND (expr, 0)); | |
288 tree arg1 = strip_float_extensions (TREE_OPERAND (expr, 1)); | |
289 | |
290 if (FLOAT_TYPE_P (TREE_TYPE (arg0)) | |
291 && FLOAT_TYPE_P (TREE_TYPE (arg1)) | |
292 && DECIMAL_FLOAT_TYPE_P (itype) == DECIMAL_FLOAT_TYPE_P (type)) | |
293 { | |
294 tree newtype = type; | |
295 | |
296 if (TYPE_MODE (TREE_TYPE (arg0)) == SDmode | |
297 || TYPE_MODE (TREE_TYPE (arg1)) == SDmode | |
298 || TYPE_MODE (type) == SDmode) | |
299 newtype = dfloat32_type_node; | |
300 if (TYPE_MODE (TREE_TYPE (arg0)) == DDmode | |
301 || TYPE_MODE (TREE_TYPE (arg1)) == DDmode | |
302 || TYPE_MODE (type) == DDmode) | |
303 newtype = dfloat64_type_node; | |
304 if (TYPE_MODE (TREE_TYPE (arg0)) == TDmode | |
305 || TYPE_MODE (TREE_TYPE (arg1)) == TDmode | |
306 || TYPE_MODE (type) == TDmode) | |
307 newtype = dfloat128_type_node; | |
308 if (newtype == dfloat32_type_node | |
309 || newtype == dfloat64_type_node | |
310 || newtype == dfloat128_type_node) | |
311 { | |
312 expr = build2 (TREE_CODE (expr), newtype, | |
313 fold (convert_to_real (newtype, arg0)), | |
314 fold (convert_to_real (newtype, arg1))); | |
315 if (newtype == type) | |
316 return expr; | |
317 break; | |
318 } | |
319 | |
320 if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (newtype)) | |
321 newtype = TREE_TYPE (arg0); | |
322 if (TYPE_PRECISION (TREE_TYPE (arg1)) > TYPE_PRECISION (newtype)) | |
323 newtype = TREE_TYPE (arg1); | |
324 /* Sometimes this transformation is safe (cannot | |
325 change results through affecting double rounding | |
326 cases) and sometimes it is not. If NEWTYPE is | |
327 wider than TYPE, e.g. (float)((long double)double | |
328 + (long double)double) converted to | |
329 (float)(double + double), the transformation is | |
330 unsafe regardless of the details of the types | |
331 involved; double rounding can arise if the result | |
332 of NEWTYPE arithmetic is a NEWTYPE value half way | |
333 between two representable TYPE values but the | |
334 exact value is sufficiently different (in the | |
335 right direction) for this difference to be | |
336 visible in ITYPE arithmetic. If NEWTYPE is the | |
337 same as TYPE, however, the transformation may be | |
338 safe depending on the types involved: it is safe | |
339 if the ITYPE has strictly more than twice as many | |
340 mantissa bits as TYPE, can represent infinities | |
341 and NaNs if the TYPE can, and has sufficient | |
342 exponent range for the product or ratio of two | |
343 values representable in the TYPE to be within the | |
344 range of normal values of ITYPE. */ | |
345 if (TYPE_PRECISION (newtype) < TYPE_PRECISION (itype) | |
346 && (flag_unsafe_math_optimizations | |
347 || (TYPE_PRECISION (newtype) == TYPE_PRECISION (type) | |
348 && real_can_shorten_arithmetic (TYPE_MODE (itype), | |
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349 TYPE_MODE (type)) |
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350 && !excess_precision_type (newtype)))) |
0 | 351 { |
352 expr = build2 (TREE_CODE (expr), newtype, | |
353 fold (convert_to_real (newtype, arg0)), | |
354 fold (convert_to_real (newtype, arg1))); | |
355 if (newtype == type) | |
356 return expr; | |
357 } | |
358 } | |
359 } | |
360 break; | |
361 default: | |
362 break; | |
363 } | |
364 | |
365 switch (TREE_CODE (TREE_TYPE (expr))) | |
366 { | |
367 case REAL_TYPE: | |
368 /* Ignore the conversion if we don't need to store intermediate | |
369 results and neither type is a decimal float. */ | |
370 return build1 ((flag_float_store | |
371 || DECIMAL_FLOAT_TYPE_P (type) | |
372 || DECIMAL_FLOAT_TYPE_P (itype)) | |
373 ? CONVERT_EXPR : NOP_EXPR, type, expr); | |
374 | |
375 case INTEGER_TYPE: | |
376 case ENUMERAL_TYPE: | |
377 case BOOLEAN_TYPE: | |
378 return build1 (FLOAT_EXPR, type, expr); | |
379 | |
380 case FIXED_POINT_TYPE: | |
381 return build1 (FIXED_CONVERT_EXPR, type, expr); | |
382 | |
383 case COMPLEX_TYPE: | |
384 return convert (type, | |
385 fold_build1 (REALPART_EXPR, | |
386 TREE_TYPE (TREE_TYPE (expr)), expr)); | |
387 | |
388 case POINTER_TYPE: | |
389 case REFERENCE_TYPE: | |
390 error ("pointer value used where a floating point value was expected"); | |
391 return convert_to_real (type, integer_zero_node); | |
392 | |
393 default: | |
394 error ("aggregate value used where a float was expected"); | |
395 return convert_to_real (type, integer_zero_node); | |
396 } | |
397 } | |
398 | |
399 /* Convert EXPR to some integer (or enum) type TYPE. | |
400 | |
401 EXPR must be pointer, integer, discrete (enum, char, or bool), float, | |
402 fixed-point or vector; in other cases error is called. | |
403 | |
404 The result of this is always supposed to be a newly created tree node | |
405 not in use in any existing structure. */ | |
406 | |
407 tree | |
408 convert_to_integer (tree type, tree expr) | |
409 { | |
410 enum tree_code ex_form = TREE_CODE (expr); | |
411 tree intype = TREE_TYPE (expr); | |
412 unsigned int inprec = TYPE_PRECISION (intype); | |
413 unsigned int outprec = TYPE_PRECISION (type); | |
414 | |
415 /* An INTEGER_TYPE cannot be incomplete, but an ENUMERAL_TYPE can | |
416 be. Consider `enum E = { a, b = (enum E) 3 };'. */ | |
417 if (!COMPLETE_TYPE_P (type)) | |
418 { | |
419 error ("conversion to incomplete type"); | |
420 return error_mark_node; | |
421 } | |
422 | |
423 /* Convert e.g. (long)round(d) -> lround(d). */ | |
424 /* If we're converting to char, we may encounter differing behavior | |
425 between converting from double->char vs double->long->char. | |
426 We're in "undefined" territory but we prefer to be conservative, | |
427 so only proceed in "unsafe" math mode. */ | |
428 if (optimize | |
429 && (flag_unsafe_math_optimizations | |
430 || (long_integer_type_node | |
431 && outprec >= TYPE_PRECISION (long_integer_type_node)))) | |
432 { | |
433 tree s_expr = strip_float_extensions (expr); | |
434 tree s_intype = TREE_TYPE (s_expr); | |
435 const enum built_in_function fcode = builtin_mathfn_code (s_expr); | |
436 tree fn = 0; | |
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437 |
0 | 438 switch (fcode) |
439 { | |
440 CASE_FLT_FN (BUILT_IN_CEIL): | |
441 /* Only convert in ISO C99 mode. */ | |
442 if (!TARGET_C99_FUNCTIONS) | |
443 break; | |
444 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
445 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
446 && !TYPE_UNSIGNED (type))) | |
447 fn = mathfn_built_in (s_intype, BUILT_IN_LCEIL); | |
448 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
449 && !TYPE_UNSIGNED (type)) | |
450 fn = mathfn_built_in (s_intype, BUILT_IN_LLCEIL); | |
451 break; | |
452 | |
453 CASE_FLT_FN (BUILT_IN_FLOOR): | |
454 /* Only convert in ISO C99 mode. */ | |
455 if (!TARGET_C99_FUNCTIONS) | |
456 break; | |
457 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
458 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
459 && !TYPE_UNSIGNED (type))) | |
460 fn = mathfn_built_in (s_intype, BUILT_IN_LFLOOR); | |
461 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
462 && !TYPE_UNSIGNED (type)) | |
463 fn = mathfn_built_in (s_intype, BUILT_IN_LLFLOOR); | |
464 break; | |
465 | |
466 CASE_FLT_FN (BUILT_IN_ROUND): | |
467 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
468 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
469 && !TYPE_UNSIGNED (type))) | |
470 fn = mathfn_built_in (s_intype, BUILT_IN_LROUND); | |
471 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
472 && !TYPE_UNSIGNED (type)) | |
473 fn = mathfn_built_in (s_intype, BUILT_IN_LLROUND); | |
474 break; | |
475 | |
476 CASE_FLT_FN (BUILT_IN_NEARBYINT): | |
477 /* Only convert nearbyint* if we can ignore math exceptions. */ | |
478 if (flag_trapping_math) | |
479 break; | |
480 /* ... Fall through ... */ | |
481 CASE_FLT_FN (BUILT_IN_RINT): | |
482 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
483 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
484 && !TYPE_UNSIGNED (type))) | |
485 fn = mathfn_built_in (s_intype, BUILT_IN_LRINT); | |
486 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
487 && !TYPE_UNSIGNED (type)) | |
488 fn = mathfn_built_in (s_intype, BUILT_IN_LLRINT); | |
489 break; | |
490 | |
491 CASE_FLT_FN (BUILT_IN_TRUNC): | |
492 return convert_to_integer (type, CALL_EXPR_ARG (s_expr, 0)); | |
493 | |
494 default: | |
495 break; | |
496 } | |
55
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497 |
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498 if (fn) |
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499 { |
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500 tree newexpr = build_call_expr (fn, 1, CALL_EXPR_ARG (s_expr, 0)); |
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501 return convert_to_integer (type, newexpr); |
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502 } |
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503 } |
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504 |
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505 /* Convert (int)logb(d) -> ilogb(d). */ |
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506 if (optimize |
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507 && flag_unsafe_math_optimizations |
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508 && !flag_trapping_math && !flag_errno_math && flag_finite_math_only |
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509 && integer_type_node |
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510 && (outprec > TYPE_PRECISION (integer_type_node) |
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511 || (outprec == TYPE_PRECISION (integer_type_node) |
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512 && !TYPE_UNSIGNED (type)))) |
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513 { |
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514 tree s_expr = strip_float_extensions (expr); |
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515 tree s_intype = TREE_TYPE (s_expr); |
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516 const enum built_in_function fcode = builtin_mathfn_code (s_expr); |
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517 tree fn = 0; |
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518 |
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519 switch (fcode) |
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520 { |
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521 CASE_FLT_FN (BUILT_IN_LOGB): |
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522 fn = mathfn_built_in (s_intype, BUILT_IN_ILOGB); |
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523 break; |
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524 |
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525 default: |
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526 break; |
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527 } |
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528 |
0 | 529 if (fn) |
530 { | |
531 tree newexpr = build_call_expr (fn, 1, CALL_EXPR_ARG (s_expr, 0)); | |
532 return convert_to_integer (type, newexpr); | |
533 } | |
534 } | |
535 | |
536 switch (TREE_CODE (intype)) | |
537 { | |
538 case POINTER_TYPE: | |
539 case REFERENCE_TYPE: | |
540 if (integer_zerop (expr)) | |
541 return build_int_cst (type, 0); | |
542 | |
55
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543 /* Convert to an unsigned integer of the correct width first, and from |
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544 there widen/truncate to the required type. Some targets support the |
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545 coexistence of multiple valid pointer sizes, so fetch the one we need |
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546 from the type. */ |
0 | 547 expr = fold_build1 (CONVERT_EXPR, |
55
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548 lang_hooks.types.type_for_size |
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549 (TYPE_PRECISION (intype), 0), |
0 | 550 expr); |
551 return fold_convert (type, expr); | |
552 | |
553 case INTEGER_TYPE: | |
554 case ENUMERAL_TYPE: | |
555 case BOOLEAN_TYPE: | |
556 case OFFSET_TYPE: | |
557 /* If this is a logical operation, which just returns 0 or 1, we can | |
558 change the type of the expression. */ | |
559 | |
560 if (TREE_CODE_CLASS (ex_form) == tcc_comparison) | |
561 { | |
562 expr = copy_node (expr); | |
563 TREE_TYPE (expr) = type; | |
564 return expr; | |
565 } | |
566 | |
567 /* If we are widening the type, put in an explicit conversion. | |
568 Similarly if we are not changing the width. After this, we know | |
569 we are truncating EXPR. */ | |
570 | |
571 else if (outprec >= inprec) | |
572 { | |
573 enum tree_code code; | |
574 tree tem; | |
575 | |
576 /* If the precision of the EXPR's type is K bits and the | |
577 destination mode has more bits, and the sign is changing, | |
578 it is not safe to use a NOP_EXPR. For example, suppose | |
579 that EXPR's type is a 3-bit unsigned integer type, the | |
580 TYPE is a 3-bit signed integer type, and the machine mode | |
581 for the types is 8-bit QImode. In that case, the | |
582 conversion necessitates an explicit sign-extension. In | |
583 the signed-to-unsigned case the high-order bits have to | |
584 be cleared. */ | |
585 if (TYPE_UNSIGNED (type) != TYPE_UNSIGNED (TREE_TYPE (expr)) | |
586 && (TYPE_PRECISION (TREE_TYPE (expr)) | |
587 != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr))))) | |
588 code = CONVERT_EXPR; | |
589 else | |
590 code = NOP_EXPR; | |
591 | |
592 tem = fold_unary (code, type, expr); | |
593 if (tem) | |
594 return tem; | |
595 | |
596 tem = build1 (code, type, expr); | |
597 TREE_NO_WARNING (tem) = 1; | |
598 return tem; | |
599 } | |
600 | |
601 /* If TYPE is an enumeral type or a type with a precision less | |
602 than the number of bits in its mode, do the conversion to the | |
603 type corresponding to its mode, then do a nop conversion | |
604 to TYPE. */ | |
605 else if (TREE_CODE (type) == ENUMERAL_TYPE | |
606 || outprec != GET_MODE_BITSIZE (TYPE_MODE (type))) | |
607 return build1 (NOP_EXPR, type, | |
608 convert (lang_hooks.types.type_for_mode | |
609 (TYPE_MODE (type), TYPE_UNSIGNED (type)), | |
610 expr)); | |
611 | |
612 /* Here detect when we can distribute the truncation down past some | |
613 arithmetic. For example, if adding two longs and converting to an | |
614 int, we can equally well convert both to ints and then add. | |
615 For the operations handled here, such truncation distribution | |
616 is always safe. | |
617 It is desirable in these cases: | |
618 1) when truncating down to full-word from a larger size | |
619 2) when truncating takes no work. | |
620 3) when at least one operand of the arithmetic has been extended | |
621 (as by C's default conversions). In this case we need two conversions | |
622 if we do the arithmetic as already requested, so we might as well | |
623 truncate both and then combine. Perhaps that way we need only one. | |
624 | |
625 Note that in general we cannot do the arithmetic in a type | |
626 shorter than the desired result of conversion, even if the operands | |
627 are both extended from a shorter type, because they might overflow | |
628 if combined in that type. The exceptions to this--the times when | |
629 two narrow values can be combined in their narrow type even to | |
630 make a wider result--are handled by "shorten" in build_binary_op. */ | |
631 | |
632 switch (ex_form) | |
633 { | |
634 case RSHIFT_EXPR: | |
635 /* We can pass truncation down through right shifting | |
636 when the shift count is a nonpositive constant. */ | |
637 if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST | |
638 && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) <= 0) | |
639 goto trunc1; | |
640 break; | |
641 | |
642 case LSHIFT_EXPR: | |
643 /* We can pass truncation down through left shifting | |
644 when the shift count is a nonnegative constant and | |
645 the target type is unsigned. */ | |
646 if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST | |
647 && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) >= 0 | |
648 && TYPE_UNSIGNED (type) | |
649 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST) | |
650 { | |
651 /* If shift count is less than the width of the truncated type, | |
652 really shift. */ | |
653 if (tree_int_cst_lt (TREE_OPERAND (expr, 1), TYPE_SIZE (type))) | |
654 /* In this case, shifting is like multiplication. */ | |
655 goto trunc1; | |
656 else | |
657 { | |
658 /* If it is >= that width, result is zero. | |
659 Handling this with trunc1 would give the wrong result: | |
660 (int) ((long long) a << 32) is well defined (as 0) | |
661 but (int) a << 32 is undefined and would get a | |
662 warning. */ | |
663 | |
664 tree t = build_int_cst (type, 0); | |
665 | |
666 /* If the original expression had side-effects, we must | |
667 preserve it. */ | |
668 if (TREE_SIDE_EFFECTS (expr)) | |
669 return build2 (COMPOUND_EXPR, type, expr, t); | |
670 else | |
671 return t; | |
672 } | |
673 } | |
674 break; | |
675 | |
676 case MAX_EXPR: | |
677 case MIN_EXPR: | |
678 case MULT_EXPR: | |
679 { | |
680 tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type); | |
681 tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type); | |
682 | |
683 /* Don't distribute unless the output precision is at least as big | |
684 as the actual inputs. Otherwise, the comparison of the | |
685 truncated values will be wrong. */ | |
686 if (outprec >= TYPE_PRECISION (TREE_TYPE (arg0)) | |
687 && outprec >= TYPE_PRECISION (TREE_TYPE (arg1)) | |
688 /* If signedness of arg0 and arg1 don't match, | |
689 we can't necessarily find a type to compare them in. */ | |
690 && (TYPE_UNSIGNED (TREE_TYPE (arg0)) | |
691 == TYPE_UNSIGNED (TREE_TYPE (arg1)))) | |
692 goto trunc1; | |
693 break; | |
694 } | |
695 | |
696 case PLUS_EXPR: | |
697 case MINUS_EXPR: | |
698 case BIT_AND_EXPR: | |
699 case BIT_IOR_EXPR: | |
700 case BIT_XOR_EXPR: | |
701 trunc1: | |
702 { | |
703 tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type); | |
704 tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type); | |
705 | |
706 if (outprec >= BITS_PER_WORD | |
707 || TRULY_NOOP_TRUNCATION (outprec, inprec) | |
708 || inprec > TYPE_PRECISION (TREE_TYPE (arg0)) | |
709 || inprec > TYPE_PRECISION (TREE_TYPE (arg1))) | |
710 { | |
711 /* Do the arithmetic in type TYPEX, | |
712 then convert result to TYPE. */ | |
713 tree typex = type; | |
714 | |
715 /* Can't do arithmetic in enumeral types | |
716 so use an integer type that will hold the values. */ | |
717 if (TREE_CODE (typex) == ENUMERAL_TYPE) | |
718 typex = lang_hooks.types.type_for_size | |
719 (TYPE_PRECISION (typex), TYPE_UNSIGNED (typex)); | |
720 | |
721 /* But now perhaps TYPEX is as wide as INPREC. | |
722 In that case, do nothing special here. | |
723 (Otherwise would recurse infinitely in convert. */ | |
724 if (TYPE_PRECISION (typex) != inprec) | |
725 { | |
726 /* Don't do unsigned arithmetic where signed was wanted, | |
727 or vice versa. | |
728 Exception: if both of the original operands were | |
729 unsigned then we can safely do the work as unsigned. | |
730 Exception: shift operations take their type solely | |
731 from the first argument. | |
732 Exception: the LSHIFT_EXPR case above requires that | |
733 we perform this operation unsigned lest we produce | |
734 signed-overflow undefinedness. | |
735 And we may need to do it as unsigned | |
736 if we truncate to the original size. */ | |
737 if (TYPE_UNSIGNED (TREE_TYPE (expr)) | |
738 || (TYPE_UNSIGNED (TREE_TYPE (arg0)) | |
739 && (TYPE_UNSIGNED (TREE_TYPE (arg1)) | |
740 || ex_form == LSHIFT_EXPR | |
741 || ex_form == RSHIFT_EXPR | |
742 || ex_form == LROTATE_EXPR | |
743 || ex_form == RROTATE_EXPR)) | |
744 || ex_form == LSHIFT_EXPR | |
745 /* If we have !flag_wrapv, and either ARG0 or | |
746 ARG1 is of a signed type, we have to do | |
747 PLUS_EXPR or MINUS_EXPR in an unsigned | |
748 type. Otherwise, we would introduce | |
749 signed-overflow undefinedness. */ | |
750 || ((!TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0)) | |
751 || !TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1))) | |
752 && (ex_form == PLUS_EXPR | |
753 || ex_form == MINUS_EXPR))) | |
754 typex = unsigned_type_for (typex); | |
755 else | |
756 typex = signed_type_for (typex); | |
757 return convert (type, | |
758 fold_build2 (ex_form, typex, | |
759 convert (typex, arg0), | |
760 convert (typex, arg1))); | |
761 } | |
762 } | |
763 } | |
764 break; | |
765 | |
766 case NEGATE_EXPR: | |
767 case BIT_NOT_EXPR: | |
768 /* This is not correct for ABS_EXPR, | |
769 since we must test the sign before truncation. */ | |
770 { | |
771 tree typex; | |
772 | |
773 /* Don't do unsigned arithmetic where signed was wanted, | |
774 or vice versa. */ | |
775 if (TYPE_UNSIGNED (TREE_TYPE (expr))) | |
776 typex = unsigned_type_for (type); | |
777 else | |
778 typex = signed_type_for (type); | |
779 return convert (type, | |
780 fold_build1 (ex_form, typex, | |
781 convert (typex, | |
782 TREE_OPERAND (expr, 0)))); | |
783 } | |
784 | |
785 case NOP_EXPR: | |
786 /* Don't introduce a | |
787 "can't convert between vector values of different size" error. */ | |
788 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == VECTOR_TYPE | |
789 && (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr, 0)))) | |
790 != GET_MODE_SIZE (TYPE_MODE (type)))) | |
791 break; | |
792 /* If truncating after truncating, might as well do all at once. | |
793 If truncating after extending, we may get rid of wasted work. */ | |
794 return convert (type, get_unwidened (TREE_OPERAND (expr, 0), type)); | |
795 | |
796 case COND_EXPR: | |
797 /* It is sometimes worthwhile to push the narrowing down through | |
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798 the conditional and never loses. A COND_EXPR may have a throw |
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799 as one operand, which then has void type. Just leave void |
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800 operands as they are. */ |
0 | 801 return fold_build3 (COND_EXPR, type, TREE_OPERAND (expr, 0), |
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802 VOID_TYPE_P (TREE_TYPE (TREE_OPERAND (expr, 1))) |
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
803 ? TREE_OPERAND (expr, 1) |
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
804 : convert (type, TREE_OPERAND (expr, 1)), |
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
805 VOID_TYPE_P (TREE_TYPE (TREE_OPERAND (expr, 2))) |
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
806 ? TREE_OPERAND (expr, 2) |
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
807 : convert (type, TREE_OPERAND (expr, 2))); |
0 | 808 |
809 default: | |
810 break; | |
811 } | |
812 | |
813 return build1 (CONVERT_EXPR, type, expr); | |
814 | |
815 case REAL_TYPE: | |
816 return build1 (FIX_TRUNC_EXPR, type, expr); | |
817 | |
818 case FIXED_POINT_TYPE: | |
819 return build1 (FIXED_CONVERT_EXPR, type, expr); | |
820 | |
821 case COMPLEX_TYPE: | |
822 return convert (type, | |
823 fold_build1 (REALPART_EXPR, | |
824 TREE_TYPE (TREE_TYPE (expr)), expr)); | |
825 | |
826 case VECTOR_TYPE: | |
827 if (!tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (TREE_TYPE (expr)))) | |
828 { | |
829 error ("can't convert between vector values of different size"); | |
830 return error_mark_node; | |
831 } | |
832 return build1 (VIEW_CONVERT_EXPR, type, expr); | |
833 | |
834 default: | |
835 error ("aggregate value used where an integer was expected"); | |
836 return convert (type, integer_zero_node); | |
837 } | |
838 } | |
839 | |
840 /* Convert EXPR to the complex type TYPE in the usual ways. */ | |
841 | |
842 tree | |
843 convert_to_complex (tree type, tree expr) | |
844 { | |
845 tree subtype = TREE_TYPE (type); | |
846 | |
847 switch (TREE_CODE (TREE_TYPE (expr))) | |
848 { | |
849 case REAL_TYPE: | |
850 case FIXED_POINT_TYPE: | |
851 case INTEGER_TYPE: | |
852 case ENUMERAL_TYPE: | |
853 case BOOLEAN_TYPE: | |
854 return build2 (COMPLEX_EXPR, type, convert (subtype, expr), | |
855 convert (subtype, integer_zero_node)); | |
856 | |
857 case COMPLEX_TYPE: | |
858 { | |
859 tree elt_type = TREE_TYPE (TREE_TYPE (expr)); | |
860 | |
861 if (TYPE_MAIN_VARIANT (elt_type) == TYPE_MAIN_VARIANT (subtype)) | |
862 return expr; | |
863 else if (TREE_CODE (expr) == COMPLEX_EXPR) | |
864 return fold_build2 (COMPLEX_EXPR, type, | |
865 convert (subtype, TREE_OPERAND (expr, 0)), | |
866 convert (subtype, TREE_OPERAND (expr, 1))); | |
867 else | |
868 { | |
869 expr = save_expr (expr); | |
870 return | |
871 fold_build2 (COMPLEX_EXPR, type, | |
872 convert (subtype, | |
873 fold_build1 (REALPART_EXPR, | |
874 TREE_TYPE (TREE_TYPE (expr)), | |
875 expr)), | |
876 convert (subtype, | |
877 fold_build1 (IMAGPART_EXPR, | |
878 TREE_TYPE (TREE_TYPE (expr)), | |
879 expr))); | |
880 } | |
881 } | |
882 | |
883 case POINTER_TYPE: | |
884 case REFERENCE_TYPE: | |
885 error ("pointer value used where a complex was expected"); | |
886 return convert_to_complex (type, integer_zero_node); | |
887 | |
888 default: | |
889 error ("aggregate value used where a complex was expected"); | |
890 return convert_to_complex (type, integer_zero_node); | |
891 } | |
892 } | |
893 | |
894 /* Convert EXPR to the vector type TYPE in the usual ways. */ | |
895 | |
896 tree | |
897 convert_to_vector (tree type, tree expr) | |
898 { | |
899 switch (TREE_CODE (TREE_TYPE (expr))) | |
900 { | |
901 case INTEGER_TYPE: | |
902 case VECTOR_TYPE: | |
903 if (!tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (TREE_TYPE (expr)))) | |
904 { | |
905 error ("can't convert between vector values of different size"); | |
906 return error_mark_node; | |
907 } | |
908 return build1 (VIEW_CONVERT_EXPR, type, expr); | |
909 | |
910 default: | |
911 error ("can't convert value to a vector"); | |
912 return error_mark_node; | |
913 } | |
914 } | |
915 | |
916 /* Convert EXPR to some fixed-point type TYPE. | |
917 | |
918 EXPR must be fixed-point, float, integer, or enumeral; | |
919 in other cases error is called. */ | |
920 | |
921 tree | |
922 convert_to_fixed (tree type, tree expr) | |
923 { | |
924 if (integer_zerop (expr)) | |
925 { | |
926 tree fixed_zero_node = build_fixed (type, FCONST0 (TYPE_MODE (type))); | |
927 return fixed_zero_node; | |
928 } | |
929 else if (integer_onep (expr) && ALL_SCALAR_ACCUM_MODE_P (TYPE_MODE (type))) | |
930 { | |
931 tree fixed_one_node = build_fixed (type, FCONST1 (TYPE_MODE (type))); | |
932 return fixed_one_node; | |
933 } | |
934 | |
935 switch (TREE_CODE (TREE_TYPE (expr))) | |
936 { | |
937 case FIXED_POINT_TYPE: | |
938 case INTEGER_TYPE: | |
939 case ENUMERAL_TYPE: | |
940 case BOOLEAN_TYPE: | |
941 case REAL_TYPE: | |
942 return build1 (FIXED_CONVERT_EXPR, type, expr); | |
943 | |
944 case COMPLEX_TYPE: | |
945 return convert (type, | |
946 fold_build1 (REALPART_EXPR, | |
947 TREE_TYPE (TREE_TYPE (expr)), expr)); | |
948 | |
949 default: | |
950 error ("aggregate value used where a fixed-point was expected"); | |
951 return error_mark_node; | |
952 } | |
953 } |