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5c1a2e63 | 1 | /* Constant folding for calls to built-in and internal functions. |
cbe34bb5 | 2 | Copyright (C) 1988-2017 Free Software Foundation, Inc. |
5c1a2e63 RS |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "coretypes.h" | |
23 | #include "realmpfr.h" | |
24 | #include "tree.h" | |
25 | #include "stor-layout.h" | |
26 | #include "options.h" | |
df838ef0 | 27 | #include "fold-const.h" |
5c1a2e63 | 28 | #include "fold-const-call.h" |
d7ebef06 | 29 | #include "case-cfn-macros.h" |
db9bd5d5 | 30 | #include "tm.h" /* For C[LT]Z_DEFINED_AT_ZERO. */ |
488c6247 | 31 | #include "builtins.h" |
4adbcdb4 | 32 | #include "gimple-expr.h" |
5c1a2e63 RS |
33 | |
34 | /* Functions that test for certain constant types, abstracting away the | |
35 | decision about whether to check for overflow. */ | |
36 | ||
37 | static inline bool | |
38 | integer_cst_p (tree t) | |
39 | { | |
40 | return TREE_CODE (t) == INTEGER_CST && !TREE_OVERFLOW (t); | |
41 | } | |
42 | ||
43 | static inline bool | |
44 | real_cst_p (tree t) | |
45 | { | |
46 | return TREE_CODE (t) == REAL_CST && !TREE_OVERFLOW (t); | |
47 | } | |
48 | ||
49 | static inline bool | |
50 | complex_cst_p (tree t) | |
51 | { | |
52 | return TREE_CODE (t) == COMPLEX_CST; | |
53 | } | |
54 | ||
df838ef0 RS |
55 | /* Return true if ARG is a constant in the range of the host size_t. |
56 | Store it in *SIZE_OUT if so. */ | |
57 | ||
58 | static inline bool | |
59 | host_size_t_cst_p (tree t, size_t *size_out) | |
60 | { | |
4adbcdb4 ML |
61 | if (types_compatible_p (size_type_node, TREE_TYPE (t)) |
62 | && integer_cst_p (t) | |
8e6cdc90 RS |
63 | && (wi::min_precision (wi::to_wide (t), UNSIGNED) |
64 | <= sizeof (size_t) * CHAR_BIT)) | |
df838ef0 RS |
65 | { |
66 | *size_out = tree_to_uhwi (t); | |
67 | return true; | |
68 | } | |
69 | return false; | |
70 | } | |
71 | ||
72 | /* RES is the result of a comparison in which < 0 means "less", 0 means | |
73 | "equal" and > 0 means "more". Canonicalize it to -1, 0 or 1 and | |
74 | return it in type TYPE. */ | |
75 | ||
a918bfbf | 76 | tree |
df838ef0 RS |
77 | build_cmp_result (tree type, int res) |
78 | { | |
79 | return build_int_cst (type, res < 0 ? -1 : res > 0 ? 1 : 0); | |
80 | } | |
81 | ||
5c1a2e63 RS |
82 | /* M is the result of trying to constant-fold an expression (starting |
83 | with clear MPFR flags) and INEXACT says whether the result in M is | |
84 | exact or inexact. Return true if M can be used as a constant-folded | |
85 | result in format FORMAT, storing the value in *RESULT if so. */ | |
86 | ||
87 | static bool | |
88 | do_mpfr_ckconv (real_value *result, mpfr_srcptr m, bool inexact, | |
89 | const real_format *format) | |
90 | { | |
91 | /* Proceed iff we get a normal number, i.e. not NaN or Inf and no | |
92 | overflow/underflow occurred. If -frounding-math, proceed iff the | |
93 | result of calling FUNC was exact. */ | |
94 | if (!mpfr_number_p (m) | |
95 | || mpfr_overflow_p () | |
96 | || mpfr_underflow_p () | |
97 | || (flag_rounding_math && inexact)) | |
98 | return false; | |
99 | ||
100 | REAL_VALUE_TYPE tmp; | |
101 | real_from_mpfr (&tmp, m, format, GMP_RNDN); | |
102 | ||
103 | /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR values. | |
104 | If the REAL_VALUE_TYPE is zero but the mpft_t is not, then we | |
105 | underflowed in the conversion. */ | |
106 | if (!real_isfinite (&tmp) | |
107 | || ((tmp.cl == rvc_zero) != (mpfr_zero_p (m) != 0))) | |
108 | return false; | |
109 | ||
110 | real_convert (result, format, &tmp); | |
111 | return real_identical (result, &tmp); | |
112 | } | |
113 | ||
114 | /* Try to evaluate: | |
115 | ||
116 | *RESULT = f (*ARG) | |
117 | ||
118 | in format FORMAT, given that FUNC is the MPFR implementation of f. | |
119 | Return true on success. */ | |
120 | ||
121 | static bool | |
122 | do_mpfr_arg1 (real_value *result, | |
123 | int (*func) (mpfr_ptr, mpfr_srcptr, mpfr_rnd_t), | |
124 | const real_value *arg, const real_format *format) | |
125 | { | |
126 | /* To proceed, MPFR must exactly represent the target floating point | |
127 | format, which only happens when the target base equals two. */ | |
128 | if (format->b != 2 || !real_isfinite (arg)) | |
129 | return false; | |
130 | ||
131 | int prec = format->p; | |
132 | mp_rnd_t rnd = format->round_towards_zero ? GMP_RNDZ : GMP_RNDN; | |
133 | mpfr_t m; | |
134 | ||
135 | mpfr_init2 (m, prec); | |
136 | mpfr_from_real (m, arg, GMP_RNDN); | |
137 | mpfr_clear_flags (); | |
138 | bool inexact = func (m, m, rnd); | |
139 | bool ok = do_mpfr_ckconv (result, m, inexact, format); | |
140 | mpfr_clear (m); | |
141 | ||
142 | return ok; | |
143 | } | |
144 | ||
145 | /* Try to evaluate: | |
146 | ||
147 | *RESULT_SIN = sin (*ARG); | |
148 | *RESULT_COS = cos (*ARG); | |
149 | ||
150 | for format FORMAT. Return true on success. */ | |
151 | ||
152 | static bool | |
153 | do_mpfr_sincos (real_value *result_sin, real_value *result_cos, | |
154 | const real_value *arg, const real_format *format) | |
155 | { | |
156 | /* To proceed, MPFR must exactly represent the target floating point | |
157 | format, which only happens when the target base equals two. */ | |
158 | if (format->b != 2 || !real_isfinite (arg)) | |
159 | return false; | |
160 | ||
161 | int prec = format->p; | |
162 | mp_rnd_t rnd = format->round_towards_zero ? GMP_RNDZ : GMP_RNDN; | |
163 | mpfr_t m, ms, mc; | |
164 | ||
165 | mpfr_inits2 (prec, m, ms, mc, NULL); | |
166 | mpfr_from_real (m, arg, GMP_RNDN); | |
167 | mpfr_clear_flags (); | |
168 | bool inexact = mpfr_sin_cos (ms, mc, m, rnd); | |
169 | bool ok = (do_mpfr_ckconv (result_sin, ms, inexact, format) | |
170 | && do_mpfr_ckconv (result_cos, mc, inexact, format)); | |
171 | mpfr_clears (m, ms, mc, NULL); | |
172 | ||
173 | return ok; | |
174 | } | |
175 | ||
176 | /* Try to evaluate: | |
177 | ||
178 | *RESULT = f (*ARG0, *ARG1) | |
179 | ||
180 | in format FORMAT, given that FUNC is the MPFR implementation of f. | |
181 | Return true on success. */ | |
182 | ||
183 | static bool | |
184 | do_mpfr_arg2 (real_value *result, | |
185 | int (*func) (mpfr_ptr, mpfr_srcptr, mpfr_srcptr, mpfr_rnd_t), | |
186 | const real_value *arg0, const real_value *arg1, | |
187 | const real_format *format) | |
188 | { | |
189 | /* To proceed, MPFR must exactly represent the target floating point | |
190 | format, which only happens when the target base equals two. */ | |
191 | if (format->b != 2 || !real_isfinite (arg0) || !real_isfinite (arg1)) | |
192 | return false; | |
193 | ||
194 | int prec = format->p; | |
195 | mp_rnd_t rnd = format->round_towards_zero ? GMP_RNDZ : GMP_RNDN; | |
196 | mpfr_t m0, m1; | |
197 | ||
198 | mpfr_inits2 (prec, m0, m1, NULL); | |
199 | mpfr_from_real (m0, arg0, GMP_RNDN); | |
200 | mpfr_from_real (m1, arg1, GMP_RNDN); | |
201 | mpfr_clear_flags (); | |
202 | bool inexact = func (m0, m0, m1, rnd); | |
203 | bool ok = do_mpfr_ckconv (result, m0, inexact, format); | |
204 | mpfr_clears (m0, m1, NULL); | |
205 | ||
206 | return ok; | |
207 | } | |
208 | ||
209 | /* Try to evaluate: | |
210 | ||
211 | *RESULT = f (ARG0, *ARG1) | |
212 | ||
213 | in format FORMAT, given that FUNC is the MPFR implementation of f. | |
214 | Return true on success. */ | |
215 | ||
216 | static bool | |
217 | do_mpfr_arg2 (real_value *result, | |
218 | int (*func) (mpfr_ptr, long, mpfr_srcptr, mp_rnd_t), | |
219 | const wide_int_ref &arg0, const real_value *arg1, | |
220 | const real_format *format) | |
221 | { | |
222 | if (format->b != 2 || !real_isfinite (arg1)) | |
223 | return false; | |
224 | ||
225 | int prec = format->p; | |
226 | mp_rnd_t rnd = format->round_towards_zero ? GMP_RNDZ : GMP_RNDN; | |
227 | mpfr_t m; | |
228 | ||
229 | mpfr_init2 (m, prec); | |
230 | mpfr_from_real (m, arg1, GMP_RNDN); | |
231 | mpfr_clear_flags (); | |
232 | bool inexact = func (m, arg0.to_shwi (), m, rnd); | |
233 | bool ok = do_mpfr_ckconv (result, m, inexact, format); | |
234 | mpfr_clear (m); | |
235 | ||
236 | return ok; | |
237 | } | |
238 | ||
239 | /* Try to evaluate: | |
240 | ||
241 | *RESULT = f (*ARG0, *ARG1, *ARG2) | |
242 | ||
243 | in format FORMAT, given that FUNC is the MPFR implementation of f. | |
244 | Return true on success. */ | |
245 | ||
246 | static bool | |
247 | do_mpfr_arg3 (real_value *result, | |
248 | int (*func) (mpfr_ptr, mpfr_srcptr, mpfr_srcptr, | |
249 | mpfr_srcptr, mpfr_rnd_t), | |
250 | const real_value *arg0, const real_value *arg1, | |
251 | const real_value *arg2, const real_format *format) | |
252 | { | |
253 | /* To proceed, MPFR must exactly represent the target floating point | |
254 | format, which only happens when the target base equals two. */ | |
255 | if (format->b != 2 | |
256 | || !real_isfinite (arg0) | |
257 | || !real_isfinite (arg1) | |
258 | || !real_isfinite (arg2)) | |
259 | return false; | |
260 | ||
261 | int prec = format->p; | |
262 | mp_rnd_t rnd = format->round_towards_zero ? GMP_RNDZ : GMP_RNDN; | |
263 | mpfr_t m0, m1, m2; | |
264 | ||
265 | mpfr_inits2 (prec, m0, m1, m2, NULL); | |
266 | mpfr_from_real (m0, arg0, GMP_RNDN); | |
267 | mpfr_from_real (m1, arg1, GMP_RNDN); | |
268 | mpfr_from_real (m2, arg2, GMP_RNDN); | |
269 | mpfr_clear_flags (); | |
270 | bool inexact = func (m0, m0, m1, m2, rnd); | |
271 | bool ok = do_mpfr_ckconv (result, m0, inexact, format); | |
272 | mpfr_clears (m0, m1, m2, NULL); | |
273 | ||
274 | return ok; | |
275 | } | |
276 | ||
277 | /* M is the result of trying to constant-fold an expression (starting | |
278 | with clear MPFR flags) and INEXACT says whether the result in M is | |
279 | exact or inexact. Return true if M can be used as a constant-folded | |
280 | result in which the real and imaginary parts have format FORMAT. | |
281 | Store those parts in *RESULT_REAL and *RESULT_IMAG if so. */ | |
282 | ||
283 | static bool | |
284 | do_mpc_ckconv (real_value *result_real, real_value *result_imag, | |
285 | mpc_srcptr m, bool inexact, const real_format *format) | |
286 | { | |
287 | /* Proceed iff we get a normal number, i.e. not NaN or Inf and no | |
288 | overflow/underflow occurred. If -frounding-math, proceed iff the | |
289 | result of calling FUNC was exact. */ | |
290 | if (!mpfr_number_p (mpc_realref (m)) | |
291 | || !mpfr_number_p (mpc_imagref (m)) | |
292 | || mpfr_overflow_p () | |
293 | || mpfr_underflow_p () | |
294 | || (flag_rounding_math && inexact)) | |
295 | return false; | |
296 | ||
297 | REAL_VALUE_TYPE tmp_real, tmp_imag; | |
298 | real_from_mpfr (&tmp_real, mpc_realref (m), format, GMP_RNDN); | |
299 | real_from_mpfr (&tmp_imag, mpc_imagref (m), format, GMP_RNDN); | |
300 | ||
301 | /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR values. | |
302 | If the REAL_VALUE_TYPE is zero but the mpft_t is not, then we | |
303 | underflowed in the conversion. */ | |
304 | if (!real_isfinite (&tmp_real) | |
305 | || !real_isfinite (&tmp_imag) | |
306 | || (tmp_real.cl == rvc_zero) != (mpfr_zero_p (mpc_realref (m)) != 0) | |
307 | || (tmp_imag.cl == rvc_zero) != (mpfr_zero_p (mpc_imagref (m)) != 0)) | |
308 | return false; | |
309 | ||
310 | real_convert (result_real, format, &tmp_real); | |
311 | real_convert (result_imag, format, &tmp_imag); | |
312 | ||
313 | return (real_identical (result_real, &tmp_real) | |
314 | && real_identical (result_imag, &tmp_imag)); | |
315 | } | |
316 | ||
317 | /* Try to evaluate: | |
318 | ||
319 | RESULT = f (ARG) | |
320 | ||
321 | in format FORMAT, given that FUNC is the mpc implementation of f. | |
322 | Return true on success. Both RESULT and ARG are represented as | |
323 | real and imaginary pairs. */ | |
324 | ||
325 | static bool | |
326 | do_mpc_arg1 (real_value *result_real, real_value *result_imag, | |
327 | int (*func) (mpc_ptr, mpc_srcptr, mpc_rnd_t), | |
328 | const real_value *arg_real, const real_value *arg_imag, | |
329 | const real_format *format) | |
330 | { | |
331 | /* To proceed, MPFR must exactly represent the target floating point | |
332 | format, which only happens when the target base equals two. */ | |
333 | if (format->b != 2 | |
334 | || !real_isfinite (arg_real) | |
335 | || !real_isfinite (arg_imag)) | |
336 | return false; | |
337 | ||
338 | int prec = format->p; | |
339 | mpc_rnd_t crnd = format->round_towards_zero ? MPC_RNDZZ : MPC_RNDNN; | |
340 | mpc_t m; | |
341 | ||
342 | mpc_init2 (m, prec); | |
343 | mpfr_from_real (mpc_realref (m), arg_real, GMP_RNDN); | |
344 | mpfr_from_real (mpc_imagref (m), arg_imag, GMP_RNDN); | |
345 | mpfr_clear_flags (); | |
346 | bool inexact = func (m, m, crnd); | |
347 | bool ok = do_mpc_ckconv (result_real, result_imag, m, inexact, format); | |
348 | mpc_clear (m); | |
349 | ||
350 | return ok; | |
351 | } | |
352 | ||
353 | /* Try to evaluate: | |
354 | ||
355 | RESULT = f (ARG0, ARG1) | |
356 | ||
357 | in format FORMAT, given that FUNC is the mpc implementation of f. | |
358 | Return true on success. RESULT, ARG0 and ARG1 are represented as | |
359 | real and imaginary pairs. */ | |
360 | ||
361 | static bool | |
362 | do_mpc_arg2 (real_value *result_real, real_value *result_imag, | |
363 | int (*func)(mpc_ptr, mpc_srcptr, mpc_srcptr, mpc_rnd_t), | |
364 | const real_value *arg0_real, const real_value *arg0_imag, | |
365 | const real_value *arg1_real, const real_value *arg1_imag, | |
366 | const real_format *format) | |
367 | { | |
368 | if (!real_isfinite (arg0_real) | |
369 | || !real_isfinite (arg0_imag) | |
370 | || !real_isfinite (arg1_real) | |
371 | || !real_isfinite (arg1_imag)) | |
372 | return false; | |
373 | ||
374 | int prec = format->p; | |
375 | mpc_rnd_t crnd = format->round_towards_zero ? MPC_RNDZZ : MPC_RNDNN; | |
376 | mpc_t m0, m1; | |
377 | ||
378 | mpc_init2 (m0, prec); | |
379 | mpc_init2 (m1, prec); | |
380 | mpfr_from_real (mpc_realref (m0), arg0_real, GMP_RNDN); | |
381 | mpfr_from_real (mpc_imagref (m0), arg0_imag, GMP_RNDN); | |
382 | mpfr_from_real (mpc_realref (m1), arg1_real, GMP_RNDN); | |
383 | mpfr_from_real (mpc_imagref (m1), arg1_imag, GMP_RNDN); | |
384 | mpfr_clear_flags (); | |
385 | bool inexact = func (m0, m0, m1, crnd); | |
386 | bool ok = do_mpc_ckconv (result_real, result_imag, m0, inexact, format); | |
387 | mpc_clear (m0); | |
388 | mpc_clear (m1); | |
389 | ||
390 | return ok; | |
391 | } | |
392 | ||
393 | /* Try to evaluate: | |
394 | ||
395 | *RESULT = logb (*ARG) | |
396 | ||
397 | in format FORMAT. Return true on success. */ | |
398 | ||
399 | static bool | |
400 | fold_const_logb (real_value *result, const real_value *arg, | |
401 | const real_format *format) | |
402 | { | |
403 | switch (arg->cl) | |
404 | { | |
405 | case rvc_nan: | |
406 | /* If arg is +-NaN, then return it. */ | |
407 | *result = *arg; | |
408 | return true; | |
409 | ||
410 | case rvc_inf: | |
411 | /* If arg is +-Inf, then return +Inf. */ | |
412 | *result = *arg; | |
413 | result->sign = 0; | |
414 | return true; | |
415 | ||
416 | case rvc_zero: | |
417 | /* Zero may set errno and/or raise an exception. */ | |
418 | return false; | |
419 | ||
420 | case rvc_normal: | |
421 | /* For normal numbers, proceed iff radix == 2. In GCC, | |
422 | normalized significands are in the range [0.5, 1.0). We | |
423 | want the exponent as if they were [1.0, 2.0) so get the | |
424 | exponent and subtract 1. */ | |
425 | if (format->b == 2) | |
426 | { | |
427 | real_from_integer (result, format, REAL_EXP (arg) - 1, SIGNED); | |
428 | return true; | |
429 | } | |
430 | return false; | |
431 | } | |
432 | gcc_unreachable (); | |
433 | } | |
434 | ||
435 | /* Try to evaluate: | |
436 | ||
437 | *RESULT = significand (*ARG) | |
438 | ||
439 | in format FORMAT. Return true on success. */ | |
440 | ||
441 | static bool | |
442 | fold_const_significand (real_value *result, const real_value *arg, | |
443 | const real_format *format) | |
444 | { | |
445 | switch (arg->cl) | |
446 | { | |
447 | case rvc_zero: | |
448 | case rvc_nan: | |
449 | case rvc_inf: | |
450 | /* If arg is +-0, +-Inf or +-NaN, then return it. */ | |
451 | *result = *arg; | |
452 | return true; | |
453 | ||
454 | case rvc_normal: | |
455 | /* For normal numbers, proceed iff radix == 2. */ | |
456 | if (format->b == 2) | |
457 | { | |
458 | *result = *arg; | |
459 | /* In GCC, normalized significands are in the range [0.5, 1.0). | |
460 | We want them to be [1.0, 2.0) so set the exponent to 1. */ | |
461 | SET_REAL_EXP (result, 1); | |
462 | return true; | |
463 | } | |
464 | return false; | |
465 | } | |
466 | gcc_unreachable (); | |
467 | } | |
468 | ||
469 | /* Try to evaluate: | |
470 | ||
471 | *RESULT = f (*ARG) | |
472 | ||
473 | where FORMAT is the format of *ARG and PRECISION is the number of | |
474 | significant bits in the result. Return true on success. */ | |
475 | ||
476 | static bool | |
477 | fold_const_conversion (wide_int *result, | |
478 | void (*fn) (real_value *, format_helper, | |
479 | const real_value *), | |
480 | const real_value *arg, unsigned int precision, | |
481 | const real_format *format) | |
482 | { | |
483 | if (!real_isfinite (arg)) | |
484 | return false; | |
485 | ||
486 | real_value rounded; | |
487 | fn (&rounded, format, arg); | |
488 | ||
489 | bool fail = false; | |
490 | *result = real_to_integer (&rounded, &fail, precision); | |
491 | return !fail; | |
492 | } | |
493 | ||
494 | /* Try to evaluate: | |
495 | ||
496 | *RESULT = pow (*ARG0, *ARG1) | |
497 | ||
498 | in format FORMAT. Return true on success. */ | |
499 | ||
500 | static bool | |
501 | fold_const_pow (real_value *result, const real_value *arg0, | |
502 | const real_value *arg1, const real_format *format) | |
503 | { | |
504 | if (do_mpfr_arg2 (result, mpfr_pow, arg0, arg1, format)) | |
505 | return true; | |
506 | ||
507 | /* Check for an integer exponent. */ | |
508 | REAL_VALUE_TYPE cint1; | |
509 | HOST_WIDE_INT n1 = real_to_integer (arg1); | |
510 | real_from_integer (&cint1, VOIDmode, n1, SIGNED); | |
511 | /* Attempt to evaluate pow at compile-time, unless this should | |
512 | raise an exception. */ | |
513 | if (real_identical (arg1, &cint1) | |
514 | && (n1 > 0 | |
515 | || (!flag_trapping_math && !flag_errno_math) | |
516 | || !real_equal (arg0, &dconst0))) | |
517 | { | |
518 | bool inexact = real_powi (result, format, arg0, n1); | |
5a00b0aa SS |
519 | /* Avoid the folding if flag_signaling_nans is on. */ |
520 | if (flag_unsafe_math_optimizations | |
521 | || (!inexact | |
522 | && !(flag_signaling_nans | |
523 | && REAL_VALUE_ISSIGNALING_NAN (*arg0)))) | |
5c1a2e63 RS |
524 | return true; |
525 | } | |
526 | ||
527 | return false; | |
528 | } | |
529 | ||
530 | /* Try to evaluate: | |
531 | ||
532 | *RESULT = ldexp (*ARG0, ARG1) | |
533 | ||
534 | in format FORMAT. Return true on success. */ | |
535 | ||
536 | static bool | |
537 | fold_const_builtin_load_exponent (real_value *result, const real_value *arg0, | |
538 | const wide_int_ref &arg1, | |
539 | const real_format *format) | |
540 | { | |
541 | /* Bound the maximum adjustment to twice the range of the | |
542 | mode's valid exponents. Use abs to ensure the range is | |
543 | positive as a sanity check. */ | |
544 | int max_exp_adj = 2 * labs (format->emax - format->emin); | |
545 | ||
546 | /* The requested adjustment must be inside this range. This | |
547 | is a preliminary cap to avoid things like overflow, we | |
548 | may still fail to compute the result for other reasons. */ | |
549 | if (wi::les_p (arg1, -max_exp_adj) || wi::ges_p (arg1, max_exp_adj)) | |
550 | return false; | |
551 | ||
5a00b0aa SS |
552 | /* Don't perform operation if we honor signaling NaNs and |
553 | operand is a signaling NaN. */ | |
554 | if (!flag_unsafe_math_optimizations | |
555 | && flag_signaling_nans | |
556 | && REAL_VALUE_ISSIGNALING_NAN (*arg0)) | |
557 | return false; | |
558 | ||
5c1a2e63 RS |
559 | REAL_VALUE_TYPE initial_result; |
560 | real_ldexp (&initial_result, arg0, arg1.to_shwi ()); | |
561 | ||
562 | /* Ensure we didn't overflow. */ | |
563 | if (real_isinf (&initial_result)) | |
564 | return false; | |
565 | ||
566 | /* Only proceed if the target mode can hold the | |
567 | resulting value. */ | |
568 | *result = real_value_truncate (format, initial_result); | |
569 | return real_equal (&initial_result, result); | |
570 | } | |
571 | ||
df838ef0 RS |
572 | /* Fold a call to __builtin_nan or __builtin_nans with argument ARG and |
573 | return type TYPE. QUIET is true if a quiet rather than signalling | |
574 | NaN is required. */ | |
575 | ||
576 | static tree | |
577 | fold_const_builtin_nan (tree type, tree arg, bool quiet) | |
578 | { | |
579 | REAL_VALUE_TYPE real; | |
580 | const char *str = c_getstr (arg); | |
581 | if (str && real_nan (&real, str, quiet, TYPE_MODE (type))) | |
582 | return build_real (type, real); | |
583 | return NULL_TREE; | |
584 | } | |
585 | ||
5c1a2e63 RS |
586 | /* Try to evaluate: |
587 | ||
588 | *RESULT = FN (*ARG) | |
589 | ||
590 | in format FORMAT. Return true on success. */ | |
591 | ||
592 | static bool | |
d7ebef06 | 593 | fold_const_call_ss (real_value *result, combined_fn fn, |
5c1a2e63 RS |
594 | const real_value *arg, const real_format *format) |
595 | { | |
596 | switch (fn) | |
597 | { | |
d7ebef06 | 598 | CASE_CFN_SQRT: |
ee5fd23a | 599 | CASE_CFN_SQRT_FN: |
5c1a2e63 RS |
600 | return (real_compare (GE_EXPR, arg, &dconst0) |
601 | && do_mpfr_arg1 (result, mpfr_sqrt, arg, format)); | |
602 | ||
d7ebef06 | 603 | CASE_CFN_CBRT: |
5c1a2e63 RS |
604 | return do_mpfr_arg1 (result, mpfr_cbrt, arg, format); |
605 | ||
d7ebef06 | 606 | CASE_CFN_ASIN: |
5c1a2e63 RS |
607 | return (real_compare (GE_EXPR, arg, &dconstm1) |
608 | && real_compare (LE_EXPR, arg, &dconst1) | |
609 | && do_mpfr_arg1 (result, mpfr_asin, arg, format)); | |
610 | ||
d7ebef06 | 611 | CASE_CFN_ACOS: |
5c1a2e63 RS |
612 | return (real_compare (GE_EXPR, arg, &dconstm1) |
613 | && real_compare (LE_EXPR, arg, &dconst1) | |
614 | && do_mpfr_arg1 (result, mpfr_acos, arg, format)); | |
615 | ||
d7ebef06 | 616 | CASE_CFN_ATAN: |
5c1a2e63 RS |
617 | return do_mpfr_arg1 (result, mpfr_atan, arg, format); |
618 | ||
d7ebef06 | 619 | CASE_CFN_ASINH: |
5c1a2e63 RS |
620 | return do_mpfr_arg1 (result, mpfr_asinh, arg, format); |
621 | ||
d7ebef06 | 622 | CASE_CFN_ACOSH: |
5c1a2e63 RS |
623 | return (real_compare (GE_EXPR, arg, &dconst1) |
624 | && do_mpfr_arg1 (result, mpfr_acosh, arg, format)); | |
625 | ||
d7ebef06 | 626 | CASE_CFN_ATANH: |
5c1a2e63 RS |
627 | return (real_compare (GE_EXPR, arg, &dconstm1) |
628 | && real_compare (LE_EXPR, arg, &dconst1) | |
629 | && do_mpfr_arg1 (result, mpfr_atanh, arg, format)); | |
630 | ||
d7ebef06 | 631 | CASE_CFN_SIN: |
5c1a2e63 RS |
632 | return do_mpfr_arg1 (result, mpfr_sin, arg, format); |
633 | ||
d7ebef06 | 634 | CASE_CFN_COS: |
5c1a2e63 RS |
635 | return do_mpfr_arg1 (result, mpfr_cos, arg, format); |
636 | ||
d7ebef06 | 637 | CASE_CFN_TAN: |
5c1a2e63 RS |
638 | return do_mpfr_arg1 (result, mpfr_tan, arg, format); |
639 | ||
d7ebef06 | 640 | CASE_CFN_SINH: |
5c1a2e63 RS |
641 | return do_mpfr_arg1 (result, mpfr_sinh, arg, format); |
642 | ||
d7ebef06 | 643 | CASE_CFN_COSH: |
5c1a2e63 RS |
644 | return do_mpfr_arg1 (result, mpfr_cosh, arg, format); |
645 | ||
d7ebef06 | 646 | CASE_CFN_TANH: |
5c1a2e63 RS |
647 | return do_mpfr_arg1 (result, mpfr_tanh, arg, format); |
648 | ||
d7ebef06 | 649 | CASE_CFN_ERF: |
5c1a2e63 RS |
650 | return do_mpfr_arg1 (result, mpfr_erf, arg, format); |
651 | ||
d7ebef06 | 652 | CASE_CFN_ERFC: |
5c1a2e63 RS |
653 | return do_mpfr_arg1 (result, mpfr_erfc, arg, format); |
654 | ||
d7ebef06 | 655 | CASE_CFN_TGAMMA: |
5c1a2e63 RS |
656 | return do_mpfr_arg1 (result, mpfr_gamma, arg, format); |
657 | ||
d7ebef06 | 658 | CASE_CFN_EXP: |
5c1a2e63 RS |
659 | return do_mpfr_arg1 (result, mpfr_exp, arg, format); |
660 | ||
d7ebef06 | 661 | CASE_CFN_EXP2: |
5c1a2e63 RS |
662 | return do_mpfr_arg1 (result, mpfr_exp2, arg, format); |
663 | ||
d7ebef06 RS |
664 | CASE_CFN_EXP10: |
665 | CASE_CFN_POW10: | |
5c1a2e63 RS |
666 | return do_mpfr_arg1 (result, mpfr_exp10, arg, format); |
667 | ||
d7ebef06 | 668 | CASE_CFN_EXPM1: |
5c1a2e63 RS |
669 | return do_mpfr_arg1 (result, mpfr_expm1, arg, format); |
670 | ||
d7ebef06 | 671 | CASE_CFN_LOG: |
5c1a2e63 RS |
672 | return (real_compare (GT_EXPR, arg, &dconst0) |
673 | && do_mpfr_arg1 (result, mpfr_log, arg, format)); | |
674 | ||
d7ebef06 | 675 | CASE_CFN_LOG2: |
5c1a2e63 RS |
676 | return (real_compare (GT_EXPR, arg, &dconst0) |
677 | && do_mpfr_arg1 (result, mpfr_log2, arg, format)); | |
678 | ||
d7ebef06 | 679 | CASE_CFN_LOG10: |
5c1a2e63 RS |
680 | return (real_compare (GT_EXPR, arg, &dconst0) |
681 | && do_mpfr_arg1 (result, mpfr_log10, arg, format)); | |
682 | ||
d7ebef06 | 683 | CASE_CFN_LOG1P: |
5c1a2e63 RS |
684 | return (real_compare (GT_EXPR, arg, &dconstm1) |
685 | && do_mpfr_arg1 (result, mpfr_log1p, arg, format)); | |
686 | ||
d7ebef06 | 687 | CASE_CFN_J0: |
5c1a2e63 RS |
688 | return do_mpfr_arg1 (result, mpfr_j0, arg, format); |
689 | ||
d7ebef06 | 690 | CASE_CFN_J1: |
5c1a2e63 RS |
691 | return do_mpfr_arg1 (result, mpfr_j1, arg, format); |
692 | ||
d7ebef06 | 693 | CASE_CFN_Y0: |
5c1a2e63 RS |
694 | return (real_compare (GT_EXPR, arg, &dconst0) |
695 | && do_mpfr_arg1 (result, mpfr_y0, arg, format)); | |
696 | ||
d7ebef06 | 697 | CASE_CFN_Y1: |
5c1a2e63 RS |
698 | return (real_compare (GT_EXPR, arg, &dconst0) |
699 | && do_mpfr_arg1 (result, mpfr_y1, arg, format)); | |
700 | ||
d7ebef06 | 701 | CASE_CFN_FLOOR: |
5c1a2e63 RS |
702 | if (!REAL_VALUE_ISNAN (*arg) || !flag_errno_math) |
703 | { | |
704 | real_floor (result, format, arg); | |
705 | return true; | |
706 | } | |
707 | return false; | |
708 | ||
d7ebef06 | 709 | CASE_CFN_CEIL: |
5c1a2e63 RS |
710 | if (!REAL_VALUE_ISNAN (*arg) || !flag_errno_math) |
711 | { | |
712 | real_ceil (result, format, arg); | |
713 | return true; | |
714 | } | |
715 | return false; | |
716 | ||
d7ebef06 | 717 | CASE_CFN_TRUNC: |
5c1a2e63 RS |
718 | real_trunc (result, format, arg); |
719 | return true; | |
720 | ||
d7ebef06 | 721 | CASE_CFN_ROUND: |
5c1a2e63 RS |
722 | if (!REAL_VALUE_ISNAN (*arg) || !flag_errno_math) |
723 | { | |
724 | real_round (result, format, arg); | |
725 | return true; | |
726 | } | |
727 | return false; | |
728 | ||
d7ebef06 | 729 | CASE_CFN_LOGB: |
5c1a2e63 RS |
730 | return fold_const_logb (result, arg, format); |
731 | ||
d7ebef06 | 732 | CASE_CFN_SIGNIFICAND: |
5c1a2e63 RS |
733 | return fold_const_significand (result, arg, format); |
734 | ||
735 | default: | |
736 | return false; | |
737 | } | |
738 | } | |
739 | ||
740 | /* Try to evaluate: | |
741 | ||
742 | *RESULT = FN (*ARG) | |
743 | ||
744 | where FORMAT is the format of ARG and PRECISION is the number of | |
745 | significant bits in the result. Return true on success. */ | |
746 | ||
747 | static bool | |
d7ebef06 | 748 | fold_const_call_ss (wide_int *result, combined_fn fn, |
5c1a2e63 RS |
749 | const real_value *arg, unsigned int precision, |
750 | const real_format *format) | |
751 | { | |
752 | switch (fn) | |
753 | { | |
d7ebef06 | 754 | CASE_CFN_SIGNBIT: |
5c1a2e63 RS |
755 | if (real_isneg (arg)) |
756 | *result = wi::one (precision); | |
757 | else | |
758 | *result = wi::zero (precision); | |
759 | return true; | |
760 | ||
d7ebef06 | 761 | CASE_CFN_ILOGB: |
5c1a2e63 RS |
762 | /* For ilogb we don't know FP_ILOGB0, so only handle normal values. |
763 | Proceed iff radix == 2. In GCC, normalized significands are in | |
764 | the range [0.5, 1.0). We want the exponent as if they were | |
765 | [1.0, 2.0) so get the exponent and subtract 1. */ | |
766 | if (arg->cl == rvc_normal && format->b == 2) | |
767 | { | |
768 | *result = wi::shwi (REAL_EXP (arg) - 1, precision); | |
769 | return true; | |
770 | } | |
771 | return false; | |
772 | ||
d7ebef06 RS |
773 | CASE_CFN_ICEIL: |
774 | CASE_CFN_LCEIL: | |
775 | CASE_CFN_LLCEIL: | |
5c1a2e63 RS |
776 | return fold_const_conversion (result, real_ceil, arg, |
777 | precision, format); | |
778 | ||
d7ebef06 RS |
779 | CASE_CFN_LFLOOR: |
780 | CASE_CFN_IFLOOR: | |
781 | CASE_CFN_LLFLOOR: | |
5c1a2e63 RS |
782 | return fold_const_conversion (result, real_floor, arg, |
783 | precision, format); | |
784 | ||
d7ebef06 RS |
785 | CASE_CFN_IROUND: |
786 | CASE_CFN_LROUND: | |
787 | CASE_CFN_LLROUND: | |
5c1a2e63 RS |
788 | return fold_const_conversion (result, real_round, arg, |
789 | precision, format); | |
790 | ||
d7ebef06 RS |
791 | CASE_CFN_IRINT: |
792 | CASE_CFN_LRINT: | |
793 | CASE_CFN_LLRINT: | |
5c1a2e63 RS |
794 | /* Not yet folded to a constant. */ |
795 | return false; | |
796 | ||
d7ebef06 RS |
797 | CASE_CFN_FINITE: |
798 | case CFN_BUILT_IN_FINITED32: | |
799 | case CFN_BUILT_IN_FINITED64: | |
800 | case CFN_BUILT_IN_FINITED128: | |
801 | case CFN_BUILT_IN_ISFINITE: | |
2556a032 RS |
802 | *result = wi::shwi (real_isfinite (arg) ? 1 : 0, precision); |
803 | return true; | |
804 | ||
d7ebef06 RS |
805 | CASE_CFN_ISINF: |
806 | case CFN_BUILT_IN_ISINFD32: | |
807 | case CFN_BUILT_IN_ISINFD64: | |
808 | case CFN_BUILT_IN_ISINFD128: | |
2556a032 RS |
809 | if (real_isinf (arg)) |
810 | *result = wi::shwi (arg->sign ? -1 : 1, precision); | |
811 | else | |
812 | *result = wi::shwi (0, precision); | |
813 | return true; | |
814 | ||
d7ebef06 RS |
815 | CASE_CFN_ISNAN: |
816 | case CFN_BUILT_IN_ISNAND32: | |
817 | case CFN_BUILT_IN_ISNAND64: | |
818 | case CFN_BUILT_IN_ISNAND128: | |
2556a032 RS |
819 | *result = wi::shwi (real_isnan (arg) ? 1 : 0, precision); |
820 | return true; | |
821 | ||
5c1a2e63 RS |
822 | default: |
823 | return false; | |
824 | } | |
825 | } | |
826 | ||
db9bd5d5 RS |
827 | /* Try to evaluate: |
828 | ||
829 | *RESULT = FN (ARG) | |
830 | ||
831 | where ARG_TYPE is the type of ARG and PRECISION is the number of bits | |
832 | in the result. Return true on success. */ | |
833 | ||
834 | static bool | |
d7ebef06 RS |
835 | fold_const_call_ss (wide_int *result, combined_fn fn, const wide_int_ref &arg, |
836 | unsigned int precision, tree arg_type) | |
db9bd5d5 RS |
837 | { |
838 | switch (fn) | |
839 | { | |
d7ebef06 | 840 | CASE_CFN_FFS: |
db9bd5d5 RS |
841 | *result = wi::shwi (wi::ffs (arg), precision); |
842 | return true; | |
843 | ||
d7ebef06 | 844 | CASE_CFN_CLZ: |
db9bd5d5 RS |
845 | { |
846 | int tmp; | |
847 | if (wi::ne_p (arg, 0)) | |
848 | tmp = wi::clz (arg); | |
7a504f33 RS |
849 | else if (!CLZ_DEFINED_VALUE_AT_ZERO (SCALAR_INT_TYPE_MODE (arg_type), |
850 | tmp)) | |
db9bd5d5 RS |
851 | tmp = TYPE_PRECISION (arg_type); |
852 | *result = wi::shwi (tmp, precision); | |
853 | return true; | |
854 | } | |
855 | ||
d7ebef06 | 856 | CASE_CFN_CTZ: |
db9bd5d5 RS |
857 | { |
858 | int tmp; | |
859 | if (wi::ne_p (arg, 0)) | |
860 | tmp = wi::ctz (arg); | |
7a504f33 RS |
861 | else if (!CTZ_DEFINED_VALUE_AT_ZERO (SCALAR_INT_TYPE_MODE (arg_type), |
862 | tmp)) | |
db9bd5d5 RS |
863 | tmp = TYPE_PRECISION (arg_type); |
864 | *result = wi::shwi (tmp, precision); | |
865 | return true; | |
866 | } | |
867 | ||
d7ebef06 | 868 | CASE_CFN_CLRSB: |
db9bd5d5 RS |
869 | *result = wi::shwi (wi::clrsb (arg), precision); |
870 | return true; | |
871 | ||
d7ebef06 | 872 | CASE_CFN_POPCOUNT: |
db9bd5d5 RS |
873 | *result = wi::shwi (wi::popcount (arg), precision); |
874 | return true; | |
875 | ||
d7ebef06 | 876 | CASE_CFN_PARITY: |
db9bd5d5 RS |
877 | *result = wi::shwi (wi::parity (arg), precision); |
878 | return true; | |
879 | ||
d7ebef06 RS |
880 | case CFN_BUILT_IN_BSWAP16: |
881 | case CFN_BUILT_IN_BSWAP32: | |
882 | case CFN_BUILT_IN_BSWAP64: | |
db9bd5d5 RS |
883 | *result = wide_int::from (arg, precision, TYPE_SIGN (arg_type)).bswap (); |
884 | return true; | |
885 | ||
886 | default: | |
887 | return false; | |
888 | } | |
889 | } | |
890 | ||
5c1a2e63 RS |
891 | /* Try to evaluate: |
892 | ||
893 | RESULT = FN (*ARG) | |
894 | ||
895 | where FORMAT is the format of ARG and of the real and imaginary parts | |
896 | of RESULT, passed as RESULT_REAL and RESULT_IMAG respectively. Return | |
897 | true on success. */ | |
898 | ||
899 | static bool | |
900 | fold_const_call_cs (real_value *result_real, real_value *result_imag, | |
d7ebef06 | 901 | combined_fn fn, const real_value *arg, |
5c1a2e63 RS |
902 | const real_format *format) |
903 | { | |
904 | switch (fn) | |
905 | { | |
d7ebef06 | 906 | CASE_CFN_CEXPI: |
5c1a2e63 RS |
907 | /* cexpi(x+yi) = cos(x)+sin(y)*i. */ |
908 | return do_mpfr_sincos (result_imag, result_real, arg, format); | |
909 | ||
910 | default: | |
911 | return false; | |
912 | } | |
913 | } | |
914 | ||
915 | /* Try to evaluate: | |
916 | ||
917 | *RESULT = fn (ARG) | |
918 | ||
919 | where FORMAT is the format of RESULT and of the real and imaginary parts | |
920 | of ARG, passed as ARG_REAL and ARG_IMAG respectively. Return true on | |
921 | success. */ | |
922 | ||
923 | static bool | |
d7ebef06 | 924 | fold_const_call_sc (real_value *result, combined_fn fn, |
5c1a2e63 RS |
925 | const real_value *arg_real, const real_value *arg_imag, |
926 | const real_format *format) | |
927 | { | |
928 | switch (fn) | |
929 | { | |
d7ebef06 | 930 | CASE_CFN_CABS: |
5c1a2e63 RS |
931 | return do_mpfr_arg2 (result, mpfr_hypot, arg_real, arg_imag, format); |
932 | ||
933 | default: | |
934 | return false; | |
935 | } | |
936 | } | |
937 | ||
938 | /* Try to evaluate: | |
939 | ||
940 | RESULT = fn (ARG) | |
941 | ||
942 | where FORMAT is the format of the real and imaginary parts of RESULT | |
943 | (RESULT_REAL and RESULT_IMAG) and of ARG (ARG_REAL and ARG_IMAG). | |
944 | Return true on success. */ | |
945 | ||
946 | static bool | |
947 | fold_const_call_cc (real_value *result_real, real_value *result_imag, | |
d7ebef06 | 948 | combined_fn fn, const real_value *arg_real, |
5c1a2e63 RS |
949 | const real_value *arg_imag, const real_format *format) |
950 | { | |
951 | switch (fn) | |
952 | { | |
d7ebef06 | 953 | CASE_CFN_CCOS: |
5c1a2e63 RS |
954 | return do_mpc_arg1 (result_real, result_imag, mpc_cos, |
955 | arg_real, arg_imag, format); | |
956 | ||
d7ebef06 | 957 | CASE_CFN_CCOSH: |
5c1a2e63 RS |
958 | return do_mpc_arg1 (result_real, result_imag, mpc_cosh, |
959 | arg_real, arg_imag, format); | |
960 | ||
d7ebef06 | 961 | CASE_CFN_CPROJ: |
5c1a2e63 RS |
962 | if (real_isinf (arg_real) || real_isinf (arg_imag)) |
963 | { | |
964 | real_inf (result_real); | |
965 | *result_imag = dconst0; | |
966 | result_imag->sign = arg_imag->sign; | |
967 | } | |
968 | else | |
969 | { | |
970 | *result_real = *arg_real; | |
971 | *result_imag = *arg_imag; | |
972 | } | |
973 | return true; | |
974 | ||
d7ebef06 | 975 | CASE_CFN_CSIN: |
5c1a2e63 RS |
976 | return do_mpc_arg1 (result_real, result_imag, mpc_sin, |
977 | arg_real, arg_imag, format); | |
978 | ||
d7ebef06 | 979 | CASE_CFN_CSINH: |
5c1a2e63 RS |
980 | return do_mpc_arg1 (result_real, result_imag, mpc_sinh, |
981 | arg_real, arg_imag, format); | |
982 | ||
d7ebef06 | 983 | CASE_CFN_CTAN: |
5c1a2e63 RS |
984 | return do_mpc_arg1 (result_real, result_imag, mpc_tan, |
985 | arg_real, arg_imag, format); | |
986 | ||
d7ebef06 | 987 | CASE_CFN_CTANH: |
5c1a2e63 RS |
988 | return do_mpc_arg1 (result_real, result_imag, mpc_tanh, |
989 | arg_real, arg_imag, format); | |
990 | ||
d7ebef06 | 991 | CASE_CFN_CLOG: |
5c1a2e63 RS |
992 | return do_mpc_arg1 (result_real, result_imag, mpc_log, |
993 | arg_real, arg_imag, format); | |
994 | ||
d7ebef06 | 995 | CASE_CFN_CSQRT: |
5c1a2e63 RS |
996 | return do_mpc_arg1 (result_real, result_imag, mpc_sqrt, |
997 | arg_real, arg_imag, format); | |
998 | ||
d7ebef06 | 999 | CASE_CFN_CASIN: |
5c1a2e63 RS |
1000 | return do_mpc_arg1 (result_real, result_imag, mpc_asin, |
1001 | arg_real, arg_imag, format); | |
1002 | ||
d7ebef06 | 1003 | CASE_CFN_CACOS: |
5c1a2e63 RS |
1004 | return do_mpc_arg1 (result_real, result_imag, mpc_acos, |
1005 | arg_real, arg_imag, format); | |
1006 | ||
d7ebef06 | 1007 | CASE_CFN_CATAN: |
5c1a2e63 RS |
1008 | return do_mpc_arg1 (result_real, result_imag, mpc_atan, |
1009 | arg_real, arg_imag, format); | |
1010 | ||
d7ebef06 | 1011 | CASE_CFN_CASINH: |
5c1a2e63 RS |
1012 | return do_mpc_arg1 (result_real, result_imag, mpc_asinh, |
1013 | arg_real, arg_imag, format); | |
1014 | ||
d7ebef06 | 1015 | CASE_CFN_CACOSH: |
5c1a2e63 RS |
1016 | return do_mpc_arg1 (result_real, result_imag, mpc_acosh, |
1017 | arg_real, arg_imag, format); | |
1018 | ||
d7ebef06 | 1019 | CASE_CFN_CATANH: |
5c1a2e63 RS |
1020 | return do_mpc_arg1 (result_real, result_imag, mpc_atanh, |
1021 | arg_real, arg_imag, format); | |
1022 | ||
d7ebef06 | 1023 | CASE_CFN_CEXP: |
5c1a2e63 RS |
1024 | return do_mpc_arg1 (result_real, result_imag, mpc_exp, |
1025 | arg_real, arg_imag, format); | |
1026 | ||
1027 | default: | |
1028 | return false; | |
1029 | } | |
1030 | } | |
1031 | ||
df838ef0 RS |
1032 | /* Subroutine of fold_const_call, with the same interface. Handle cases |
1033 | where the arguments and result are numerical. */ | |
5c1a2e63 | 1034 | |
df838ef0 | 1035 | static tree |
d7ebef06 | 1036 | fold_const_call_1 (combined_fn fn, tree type, tree arg) |
5c1a2e63 RS |
1037 | { |
1038 | machine_mode mode = TYPE_MODE (type); | |
1039 | machine_mode arg_mode = TYPE_MODE (TREE_TYPE (arg)); | |
1040 | ||
db9bd5d5 RS |
1041 | if (integer_cst_p (arg)) |
1042 | { | |
1043 | if (SCALAR_INT_MODE_P (mode)) | |
1044 | { | |
1045 | wide_int result; | |
8e6cdc90 RS |
1046 | if (fold_const_call_ss (&result, fn, wi::to_wide (arg), |
1047 | TYPE_PRECISION (type), TREE_TYPE (arg))) | |
db9bd5d5 RS |
1048 | return wide_int_to_tree (type, result); |
1049 | } | |
1050 | return NULL_TREE; | |
1051 | } | |
1052 | ||
5c1a2e63 RS |
1053 | if (real_cst_p (arg)) |
1054 | { | |
1055 | gcc_checking_assert (SCALAR_FLOAT_MODE_P (arg_mode)); | |
1056 | if (mode == arg_mode) | |
1057 | { | |
1058 | /* real -> real. */ | |
1059 | REAL_VALUE_TYPE result; | |
1060 | if (fold_const_call_ss (&result, fn, TREE_REAL_CST_PTR (arg), | |
1061 | REAL_MODE_FORMAT (mode))) | |
1062 | return build_real (type, result); | |
1063 | } | |
1064 | else if (COMPLEX_MODE_P (mode) | |
1065 | && GET_MODE_INNER (mode) == arg_mode) | |
1066 | { | |
1067 | /* real -> complex real. */ | |
1068 | REAL_VALUE_TYPE result_real, result_imag; | |
1069 | if (fold_const_call_cs (&result_real, &result_imag, fn, | |
1070 | TREE_REAL_CST_PTR (arg), | |
1071 | REAL_MODE_FORMAT (arg_mode))) | |
1072 | return build_complex (type, | |
1073 | build_real (TREE_TYPE (type), result_real), | |
1074 | build_real (TREE_TYPE (type), result_imag)); | |
1075 | } | |
1076 | else if (INTEGRAL_TYPE_P (type)) | |
1077 | { | |
1078 | /* real -> int. */ | |
1079 | wide_int result; | |
1080 | if (fold_const_call_ss (&result, fn, | |
1081 | TREE_REAL_CST_PTR (arg), | |
1082 | TYPE_PRECISION (type), | |
1083 | REAL_MODE_FORMAT (arg_mode))) | |
1084 | return wide_int_to_tree (type, result); | |
1085 | } | |
1086 | return NULL_TREE; | |
1087 | } | |
1088 | ||
1089 | if (complex_cst_p (arg)) | |
1090 | { | |
1091 | gcc_checking_assert (COMPLEX_MODE_P (arg_mode)); | |
1092 | machine_mode inner_mode = GET_MODE_INNER (arg_mode); | |
1093 | tree argr = TREE_REALPART (arg); | |
1094 | tree argi = TREE_IMAGPART (arg); | |
1095 | if (mode == arg_mode | |
1096 | && real_cst_p (argr) | |
1097 | && real_cst_p (argi)) | |
1098 | { | |
1099 | /* complex real -> complex real. */ | |
1100 | REAL_VALUE_TYPE result_real, result_imag; | |
1101 | if (fold_const_call_cc (&result_real, &result_imag, fn, | |
1102 | TREE_REAL_CST_PTR (argr), | |
1103 | TREE_REAL_CST_PTR (argi), | |
1104 | REAL_MODE_FORMAT (inner_mode))) | |
1105 | return build_complex (type, | |
1106 | build_real (TREE_TYPE (type), result_real), | |
1107 | build_real (TREE_TYPE (type), result_imag)); | |
1108 | } | |
1109 | if (mode == inner_mode | |
1110 | && real_cst_p (argr) | |
1111 | && real_cst_p (argi)) | |
1112 | { | |
1113 | /* complex real -> real. */ | |
1114 | REAL_VALUE_TYPE result; | |
1115 | if (fold_const_call_sc (&result, fn, | |
1116 | TREE_REAL_CST_PTR (argr), | |
1117 | TREE_REAL_CST_PTR (argi), | |
1118 | REAL_MODE_FORMAT (inner_mode))) | |
1119 | return build_real (type, result); | |
1120 | } | |
1121 | return NULL_TREE; | |
1122 | } | |
1123 | ||
1124 | return NULL_TREE; | |
1125 | } | |
1126 | ||
df838ef0 RS |
1127 | /* Try to fold FN (ARG) to a constant. Return the constant on success, |
1128 | otherwise return null. TYPE is the type of the return value. */ | |
1129 | ||
1130 | tree | |
d7ebef06 | 1131 | fold_const_call (combined_fn fn, tree type, tree arg) |
df838ef0 RS |
1132 | { |
1133 | switch (fn) | |
1134 | { | |
d7ebef06 | 1135 | case CFN_BUILT_IN_STRLEN: |
df838ef0 RS |
1136 | if (const char *str = c_getstr (arg)) |
1137 | return build_int_cst (type, strlen (str)); | |
1138 | return NULL_TREE; | |
1139 | ||
d7ebef06 | 1140 | CASE_CFN_NAN: |
6dc198e3 | 1141 | CASE_FLT_FN_FLOATN_NX (CFN_BUILT_IN_NAN): |
d7ebef06 RS |
1142 | case CFN_BUILT_IN_NAND32: |
1143 | case CFN_BUILT_IN_NAND64: | |
1144 | case CFN_BUILT_IN_NAND128: | |
df838ef0 RS |
1145 | return fold_const_builtin_nan (type, arg, true); |
1146 | ||
d7ebef06 | 1147 | CASE_CFN_NANS: |
6dc198e3 | 1148 | CASE_FLT_FN_FLOATN_NX (CFN_BUILT_IN_NANS): |
df838ef0 RS |
1149 | return fold_const_builtin_nan (type, arg, false); |
1150 | ||
1151 | default: | |
1152 | return fold_const_call_1 (fn, type, arg); | |
1153 | } | |
1154 | } | |
1155 | ||
5c1a2e63 RS |
1156 | /* Try to evaluate: |
1157 | ||
1158 | *RESULT = FN (*ARG0, *ARG1) | |
1159 | ||
1160 | in format FORMAT. Return true on success. */ | |
1161 | ||
1162 | static bool | |
d7ebef06 | 1163 | fold_const_call_sss (real_value *result, combined_fn fn, |
5c1a2e63 RS |
1164 | const real_value *arg0, const real_value *arg1, |
1165 | const real_format *format) | |
1166 | { | |
1167 | switch (fn) | |
1168 | { | |
d7ebef06 RS |
1169 | CASE_CFN_DREM: |
1170 | CASE_CFN_REMAINDER: | |
5c1a2e63 RS |
1171 | return do_mpfr_arg2 (result, mpfr_remainder, arg0, arg1, format); |
1172 | ||
d7ebef06 | 1173 | CASE_CFN_ATAN2: |
5c1a2e63 RS |
1174 | return do_mpfr_arg2 (result, mpfr_atan2, arg0, arg1, format); |
1175 | ||
d7ebef06 | 1176 | CASE_CFN_FDIM: |
5c1a2e63 RS |
1177 | return do_mpfr_arg2 (result, mpfr_dim, arg0, arg1, format); |
1178 | ||
d7ebef06 | 1179 | CASE_CFN_HYPOT: |
5c1a2e63 RS |
1180 | return do_mpfr_arg2 (result, mpfr_hypot, arg0, arg1, format); |
1181 | ||
d7ebef06 | 1182 | CASE_CFN_COPYSIGN: |
ee5fd23a | 1183 | CASE_CFN_COPYSIGN_FN: |
5c1a2e63 RS |
1184 | *result = *arg0; |
1185 | real_copysign (result, arg1); | |
1186 | return true; | |
1187 | ||
d7ebef06 | 1188 | CASE_CFN_FMIN: |
ee5fd23a | 1189 | CASE_CFN_FMIN_FN: |
5c1a2e63 RS |
1190 | return do_mpfr_arg2 (result, mpfr_min, arg0, arg1, format); |
1191 | ||
d7ebef06 | 1192 | CASE_CFN_FMAX: |
ee5fd23a | 1193 | CASE_CFN_FMAX_FN: |
5c1a2e63 RS |
1194 | return do_mpfr_arg2 (result, mpfr_max, arg0, arg1, format); |
1195 | ||
d7ebef06 | 1196 | CASE_CFN_POW: |
5c1a2e63 RS |
1197 | return fold_const_pow (result, arg0, arg1, format); |
1198 | ||
1199 | default: | |
1200 | return false; | |
1201 | } | |
1202 | } | |
1203 | ||
1204 | /* Try to evaluate: | |
1205 | ||
1206 | *RESULT = FN (*ARG0, ARG1) | |
1207 | ||
1208 | where FORMAT is the format of *RESULT and *ARG0. Return true on | |
1209 | success. */ | |
1210 | ||
1211 | static bool | |
d7ebef06 | 1212 | fold_const_call_sss (real_value *result, combined_fn fn, |
5c1a2e63 RS |
1213 | const real_value *arg0, const wide_int_ref &arg1, |
1214 | const real_format *format) | |
1215 | { | |
1216 | switch (fn) | |
1217 | { | |
d7ebef06 | 1218 | CASE_CFN_LDEXP: |
5c1a2e63 RS |
1219 | return fold_const_builtin_load_exponent (result, arg0, arg1, format); |
1220 | ||
d7ebef06 RS |
1221 | CASE_CFN_SCALBN: |
1222 | CASE_CFN_SCALBLN: | |
5c1a2e63 RS |
1223 | return (format->b == 2 |
1224 | && fold_const_builtin_load_exponent (result, arg0, arg1, | |
1225 | format)); | |
1226 | ||
d7ebef06 | 1227 | CASE_CFN_POWI: |
5a00b0aa SS |
1228 | /* Avoid the folding if flag_signaling_nans is on and |
1229 | operand is a signaling NaN. */ | |
1230 | if (!flag_unsafe_math_optimizations | |
1231 | && flag_signaling_nans | |
1232 | && REAL_VALUE_ISSIGNALING_NAN (*arg0)) | |
1233 | return false; | |
1234 | ||
5c1a2e63 RS |
1235 | real_powi (result, format, arg0, arg1.to_shwi ()); |
1236 | return true; | |
1237 | ||
1238 | default: | |
1239 | return false; | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | /* Try to evaluate: | |
1244 | ||
1245 | *RESULT = FN (ARG0, *ARG1) | |
1246 | ||
1247 | where FORMAT is the format of *RESULT and *ARG1. Return true on | |
1248 | success. */ | |
1249 | ||
1250 | static bool | |
d7ebef06 | 1251 | fold_const_call_sss (real_value *result, combined_fn fn, |
5c1a2e63 RS |
1252 | const wide_int_ref &arg0, const real_value *arg1, |
1253 | const real_format *format) | |
1254 | { | |
1255 | switch (fn) | |
1256 | { | |
d7ebef06 | 1257 | CASE_CFN_JN: |
5c1a2e63 RS |
1258 | return do_mpfr_arg2 (result, mpfr_jn, arg0, arg1, format); |
1259 | ||
d7ebef06 | 1260 | CASE_CFN_YN: |
5c1a2e63 RS |
1261 | return (real_compare (GT_EXPR, arg1, &dconst0) |
1262 | && do_mpfr_arg2 (result, mpfr_yn, arg0, arg1, format)); | |
1263 | ||
1264 | default: | |
1265 | return false; | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | /* Try to evaluate: | |
1270 | ||
1271 | RESULT = fn (ARG0, ARG1) | |
1272 | ||
1273 | where FORMAT is the format of the real and imaginary parts of RESULT | |
1274 | (RESULT_REAL and RESULT_IMAG), of ARG0 (ARG0_REAL and ARG0_IMAG) | |
1275 | and of ARG1 (ARG1_REAL and ARG1_IMAG). Return true on success. */ | |
1276 | ||
1277 | static bool | |
1278 | fold_const_call_ccc (real_value *result_real, real_value *result_imag, | |
d7ebef06 | 1279 | combined_fn fn, const real_value *arg0_real, |
5c1a2e63 RS |
1280 | const real_value *arg0_imag, const real_value *arg1_real, |
1281 | const real_value *arg1_imag, const real_format *format) | |
1282 | { | |
1283 | switch (fn) | |
1284 | { | |
d7ebef06 | 1285 | CASE_CFN_CPOW: |
5c1a2e63 RS |
1286 | return do_mpc_arg2 (result_real, result_imag, mpc_pow, |
1287 | arg0_real, arg0_imag, arg1_real, arg1_imag, format); | |
1288 | ||
1289 | default: | |
1290 | return false; | |
1291 | } | |
1292 | } | |
1293 | ||
df838ef0 RS |
1294 | /* Subroutine of fold_const_call, with the same interface. Handle cases |
1295 | where the arguments and result are numerical. */ | |
5c1a2e63 | 1296 | |
df838ef0 | 1297 | static tree |
d7ebef06 | 1298 | fold_const_call_1 (combined_fn fn, tree type, tree arg0, tree arg1) |
5c1a2e63 RS |
1299 | { |
1300 | machine_mode mode = TYPE_MODE (type); | |
1301 | machine_mode arg0_mode = TYPE_MODE (TREE_TYPE (arg0)); | |
1302 | machine_mode arg1_mode = TYPE_MODE (TREE_TYPE (arg1)); | |
1303 | ||
1304 | if (arg0_mode == arg1_mode | |
1305 | && real_cst_p (arg0) | |
1306 | && real_cst_p (arg1)) | |
1307 | { | |
1308 | gcc_checking_assert (SCALAR_FLOAT_MODE_P (arg0_mode)); | |
1309 | if (mode == arg0_mode) | |
1310 | { | |
1311 | /* real, real -> real. */ | |
1312 | REAL_VALUE_TYPE result; | |
1313 | if (fold_const_call_sss (&result, fn, TREE_REAL_CST_PTR (arg0), | |
1314 | TREE_REAL_CST_PTR (arg1), | |
1315 | REAL_MODE_FORMAT (mode))) | |
1316 | return build_real (type, result); | |
1317 | } | |
1318 | return NULL_TREE; | |
1319 | } | |
1320 | ||
1321 | if (real_cst_p (arg0) | |
1322 | && integer_cst_p (arg1)) | |
1323 | { | |
1324 | gcc_checking_assert (SCALAR_FLOAT_MODE_P (arg0_mode)); | |
1325 | if (mode == arg0_mode) | |
1326 | { | |
1327 | /* real, int -> real. */ | |
1328 | REAL_VALUE_TYPE result; | |
1329 | if (fold_const_call_sss (&result, fn, TREE_REAL_CST_PTR (arg0), | |
8e6cdc90 RS |
1330 | wi::to_wide (arg1), |
1331 | REAL_MODE_FORMAT (mode))) | |
5c1a2e63 RS |
1332 | return build_real (type, result); |
1333 | } | |
1334 | return NULL_TREE; | |
1335 | } | |
1336 | ||
1337 | if (integer_cst_p (arg0) | |
1338 | && real_cst_p (arg1)) | |
1339 | { | |
1340 | gcc_checking_assert (SCALAR_FLOAT_MODE_P (arg1_mode)); | |
1341 | if (mode == arg1_mode) | |
1342 | { | |
1343 | /* int, real -> real. */ | |
1344 | REAL_VALUE_TYPE result; | |
8e6cdc90 | 1345 | if (fold_const_call_sss (&result, fn, wi::to_wide (arg0), |
5c1a2e63 RS |
1346 | TREE_REAL_CST_PTR (arg1), |
1347 | REAL_MODE_FORMAT (mode))) | |
1348 | return build_real (type, result); | |
1349 | } | |
1350 | return NULL_TREE; | |
1351 | } | |
1352 | ||
1353 | if (arg0_mode == arg1_mode | |
1354 | && complex_cst_p (arg0) | |
1355 | && complex_cst_p (arg1)) | |
1356 | { | |
1357 | gcc_checking_assert (COMPLEX_MODE_P (arg0_mode)); | |
1358 | machine_mode inner_mode = GET_MODE_INNER (arg0_mode); | |
1359 | tree arg0r = TREE_REALPART (arg0); | |
1360 | tree arg0i = TREE_IMAGPART (arg0); | |
1361 | tree arg1r = TREE_REALPART (arg1); | |
1362 | tree arg1i = TREE_IMAGPART (arg1); | |
1363 | if (mode == arg0_mode | |
1364 | && real_cst_p (arg0r) | |
1365 | && real_cst_p (arg0i) | |
1366 | && real_cst_p (arg1r) | |
1367 | && real_cst_p (arg1i)) | |
1368 | { | |
1369 | /* complex real, complex real -> complex real. */ | |
1370 | REAL_VALUE_TYPE result_real, result_imag; | |
1371 | if (fold_const_call_ccc (&result_real, &result_imag, fn, | |
1372 | TREE_REAL_CST_PTR (arg0r), | |
1373 | TREE_REAL_CST_PTR (arg0i), | |
1374 | TREE_REAL_CST_PTR (arg1r), | |
1375 | TREE_REAL_CST_PTR (arg1i), | |
1376 | REAL_MODE_FORMAT (inner_mode))) | |
1377 | return build_complex (type, | |
1378 | build_real (TREE_TYPE (type), result_real), | |
1379 | build_real (TREE_TYPE (type), result_imag)); | |
1380 | } | |
1381 | return NULL_TREE; | |
1382 | } | |
1383 | ||
1384 | return NULL_TREE; | |
1385 | } | |
1386 | ||
df838ef0 RS |
1387 | /* Try to fold FN (ARG0, ARG1) to a constant. Return the constant on success, |
1388 | otherwise return null. TYPE is the type of the return value. */ | |
1389 | ||
1390 | tree | |
d7ebef06 | 1391 | fold_const_call (combined_fn fn, tree type, tree arg0, tree arg1) |
df838ef0 RS |
1392 | { |
1393 | const char *p0, *p1; | |
bf2d0849 | 1394 | char c; |
df838ef0 RS |
1395 | switch (fn) |
1396 | { | |
d7ebef06 | 1397 | case CFN_BUILT_IN_STRSPN: |
df838ef0 RS |
1398 | if ((p0 = c_getstr (arg0)) && (p1 = c_getstr (arg1))) |
1399 | return build_int_cst (type, strspn (p0, p1)); | |
1400 | return NULL_TREE; | |
1401 | ||
d7ebef06 | 1402 | case CFN_BUILT_IN_STRCSPN: |
df838ef0 RS |
1403 | if ((p0 = c_getstr (arg0)) && (p1 = c_getstr (arg1))) |
1404 | return build_int_cst (type, strcspn (p0, p1)); | |
1405 | return NULL_TREE; | |
1406 | ||
d7ebef06 | 1407 | case CFN_BUILT_IN_STRCMP: |
df838ef0 RS |
1408 | if ((p0 = c_getstr (arg0)) && (p1 = c_getstr (arg1))) |
1409 | return build_cmp_result (type, strcmp (p0, p1)); | |
1410 | return NULL_TREE; | |
1411 | ||
a918bfbf ML |
1412 | case CFN_BUILT_IN_STRCASECMP: |
1413 | if ((p0 = c_getstr (arg0)) && (p1 = c_getstr (arg1))) | |
1414 | { | |
1415 | int r = strcmp (p0, p1); | |
1416 | if (r == 0) | |
1417 | return build_cmp_result (type, r); | |
1418 | } | |
1419 | return NULL_TREE; | |
1420 | ||
bf2d0849 JJ |
1421 | case CFN_BUILT_IN_INDEX: |
1422 | case CFN_BUILT_IN_STRCHR: | |
1423 | if ((p0 = c_getstr (arg0)) && target_char_cst_p (arg1, &c)) | |
1424 | { | |
1425 | const char *r = strchr (p0, c); | |
1426 | if (r == NULL) | |
1427 | return build_int_cst (type, 0); | |
1428 | return fold_convert (type, | |
1429 | fold_build_pointer_plus_hwi (arg0, r - p0)); | |
1430 | } | |
1431 | return NULL_TREE; | |
1432 | ||
1433 | case CFN_BUILT_IN_RINDEX: | |
1434 | case CFN_BUILT_IN_STRRCHR: | |
1435 | if ((p0 = c_getstr (arg0)) && target_char_cst_p (arg1, &c)) | |
1436 | { | |
1437 | const char *r = strrchr (p0, c); | |
1438 | if (r == NULL) | |
1439 | return build_int_cst (type, 0); | |
1440 | return fold_convert (type, | |
1441 | fold_build_pointer_plus_hwi (arg0, r - p0)); | |
1442 | } | |
1443 | return NULL_TREE; | |
1444 | ||
c8952930 JJ |
1445 | case CFN_BUILT_IN_STRSTR: |
1446 | if ((p1 = c_getstr (arg1))) | |
1447 | { | |
1448 | if ((p0 = c_getstr (arg0))) | |
1449 | { | |
1450 | const char *r = strstr (p0, p1); | |
1451 | if (r == NULL) | |
1452 | return build_int_cst (type, 0); | |
1453 | return fold_convert (type, | |
1454 | fold_build_pointer_plus_hwi (arg0, r - p0)); | |
1455 | } | |
1456 | if (*p1 == '\0') | |
1457 | return fold_convert (type, arg0); | |
1458 | } | |
1459 | return NULL_TREE; | |
1460 | ||
df838ef0 RS |
1461 | default: |
1462 | return fold_const_call_1 (fn, type, arg0, arg1); | |
1463 | } | |
1464 | } | |
1465 | ||
5c1a2e63 RS |
1466 | /* Try to evaluate: |
1467 | ||
1468 | *RESULT = FN (*ARG0, *ARG1, *ARG2) | |
1469 | ||
1470 | in format FORMAT. Return true on success. */ | |
1471 | ||
1472 | static bool | |
d7ebef06 | 1473 | fold_const_call_ssss (real_value *result, combined_fn fn, |
5c1a2e63 RS |
1474 | const real_value *arg0, const real_value *arg1, |
1475 | const real_value *arg2, const real_format *format) | |
1476 | { | |
1477 | switch (fn) | |
1478 | { | |
d7ebef06 | 1479 | CASE_CFN_FMA: |
ee5fd23a | 1480 | CASE_CFN_FMA_FN: |
5c1a2e63 RS |
1481 | return do_mpfr_arg3 (result, mpfr_fma, arg0, arg1, arg2, format); |
1482 | ||
1483 | default: | |
1484 | return false; | |
1485 | } | |
1486 | } | |
1487 | ||
df838ef0 RS |
1488 | /* Subroutine of fold_const_call, with the same interface. Handle cases |
1489 | where the arguments and result are numerical. */ | |
5c1a2e63 | 1490 | |
df838ef0 | 1491 | static tree |
d7ebef06 | 1492 | fold_const_call_1 (combined_fn fn, tree type, tree arg0, tree arg1, tree arg2) |
5c1a2e63 RS |
1493 | { |
1494 | machine_mode mode = TYPE_MODE (type); | |
1495 | machine_mode arg0_mode = TYPE_MODE (TREE_TYPE (arg0)); | |
1496 | machine_mode arg1_mode = TYPE_MODE (TREE_TYPE (arg1)); | |
1497 | machine_mode arg2_mode = TYPE_MODE (TREE_TYPE (arg2)); | |
1498 | ||
1499 | if (arg0_mode == arg1_mode | |
1500 | && arg0_mode == arg2_mode | |
1501 | && real_cst_p (arg0) | |
1502 | && real_cst_p (arg1) | |
1503 | && real_cst_p (arg2)) | |
1504 | { | |
1505 | gcc_checking_assert (SCALAR_FLOAT_MODE_P (arg0_mode)); | |
1506 | if (mode == arg0_mode) | |
1507 | { | |
1508 | /* real, real, real -> real. */ | |
1509 | REAL_VALUE_TYPE result; | |
1510 | if (fold_const_call_ssss (&result, fn, TREE_REAL_CST_PTR (arg0), | |
1511 | TREE_REAL_CST_PTR (arg1), | |
1512 | TREE_REAL_CST_PTR (arg2), | |
1513 | REAL_MODE_FORMAT (mode))) | |
1514 | return build_real (type, result); | |
1515 | } | |
1516 | return NULL_TREE; | |
1517 | } | |
1518 | ||
1519 | return NULL_TREE; | |
1520 | } | |
1521 | ||
df838ef0 RS |
1522 | /* Try to fold FN (ARG0, ARG1, ARG2) to a constant. Return the constant on |
1523 | success, otherwise return null. TYPE is the type of the return value. */ | |
1524 | ||
1525 | tree | |
d7ebef06 | 1526 | fold_const_call (combined_fn fn, tree type, tree arg0, tree arg1, tree arg2) |
df838ef0 RS |
1527 | { |
1528 | const char *p0, *p1; | |
66972191 | 1529 | char c; |
302356da ML |
1530 | unsigned HOST_WIDE_INT s0, s1; |
1531 | size_t s2 = 0; | |
df838ef0 RS |
1532 | switch (fn) |
1533 | { | |
d7ebef06 | 1534 | case CFN_BUILT_IN_STRNCMP: |
66972191 | 1535 | if (!host_size_t_cst_p (arg2, &s2)) |
a918bfbf | 1536 | return NULL_TREE; |
66972191 JJ |
1537 | if (s2 == 0 |
1538 | && !TREE_SIDE_EFFECTS (arg0) | |
1539 | && !TREE_SIDE_EFFECTS (arg1)) | |
1540 | return build_int_cst (type, 0); | |
1541 | else if ((p0 = c_getstr (arg0)) && (p1 = c_getstr (arg1))) | |
1542 | return build_int_cst (type, strncmp (p0, p1, s2)); | |
1543 | return NULL_TREE; | |
1544 | ||
a918bfbf | 1545 | case CFN_BUILT_IN_STRNCASECMP: |
66972191 | 1546 | if (!host_size_t_cst_p (arg2, &s2)) |
a918bfbf | 1547 | return NULL_TREE; |
66972191 JJ |
1548 | if (s2 == 0 |
1549 | && !TREE_SIDE_EFFECTS (arg0) | |
1550 | && !TREE_SIDE_EFFECTS (arg1)) | |
1551 | return build_int_cst (type, 0); | |
1552 | else if ((p0 = c_getstr (arg0)) | |
1553 | && (p1 = c_getstr (arg1)) | |
1554 | && strncmp (p0, p1, s2) == 0) | |
1555 | return build_int_cst (type, 0); | |
1556 | return NULL_TREE; | |
1557 | ||
d7ebef06 RS |
1558 | case CFN_BUILT_IN_BCMP: |
1559 | case CFN_BUILT_IN_MEMCMP: | |
66972191 JJ |
1560 | if (!host_size_t_cst_p (arg2, &s2)) |
1561 | return NULL_TREE; | |
1562 | if (s2 == 0 | |
1563 | && !TREE_SIDE_EFFECTS (arg0) | |
1564 | && !TREE_SIDE_EFFECTS (arg1)) | |
1565 | return build_int_cst (type, 0); | |
68c93708 ML |
1566 | if ((p0 = c_getstr (arg0, &s0)) |
1567 | && (p1 = c_getstr (arg1, &s1)) | |
68c93708 ML |
1568 | && s2 <= s0 |
1569 | && s2 <= s1) | |
df838ef0 RS |
1570 | return build_cmp_result (type, memcmp (p0, p1, s2)); |
1571 | return NULL_TREE; | |
1572 | ||
66972191 JJ |
1573 | case CFN_BUILT_IN_MEMCHR: |
1574 | if (!host_size_t_cst_p (arg2, &s2)) | |
1575 | return NULL_TREE; | |
1576 | if (s2 == 0 | |
1577 | && !TREE_SIDE_EFFECTS (arg0) | |
1578 | && !TREE_SIDE_EFFECTS (arg1)) | |
1579 | return build_int_cst (type, 0); | |
1580 | if ((p0 = c_getstr (arg0, &s0)) | |
1581 | && s2 <= s0 | |
1582 | && target_char_cst_p (arg1, &c)) | |
1583 | { | |
1584 | const char *r = (const char *) memchr (p0, c, s2); | |
1585 | if (r == NULL) | |
1586 | return build_int_cst (type, 0); | |
1587 | return fold_convert (type, | |
1588 | fold_build_pointer_plus_hwi (arg0, r - p0)); | |
1589 | } | |
1590 | return NULL_TREE; | |
1591 | ||
df838ef0 RS |
1592 | default: |
1593 | return fold_const_call_1 (fn, type, arg0, arg1, arg2); | |
1594 | } | |
1595 | } | |
1596 | ||
5c1a2e63 RS |
1597 | /* Fold a fma operation with arguments ARG[012]. */ |
1598 | ||
1599 | tree | |
1600 | fold_fma (location_t, tree type, tree arg0, tree arg1, tree arg2) | |
1601 | { | |
1602 | REAL_VALUE_TYPE result; | |
1603 | if (real_cst_p (arg0) | |
1604 | && real_cst_p (arg1) | |
1605 | && real_cst_p (arg2) | |
1606 | && do_mpfr_arg3 (&result, mpfr_fma, TREE_REAL_CST_PTR (arg0), | |
1607 | TREE_REAL_CST_PTR (arg1), TREE_REAL_CST_PTR (arg2), | |
1608 | REAL_MODE_FORMAT (TYPE_MODE (type)))) | |
1609 | return build_real (type, result); | |
1610 | ||
1611 | return NULL_TREE; | |
1612 | } |