msg_132.c revision 1.52
1 /* $NetBSD: msg_132.c,v 1.52 2025/01/02 20:02:59 rillig Exp $ */ 2 # 3 "msg_132.c" 3 4 // Test for message: conversion from '%s' to '%s' may lose accuracy [132] 5 6 /* 7 * NetBSD's default lint flags only include a single -a, which only flags 8 * narrowing conversions from long. To get warnings for all narrowing 9 * conversions, -a needs to be given more than once. 10 * 11 * https://gnats.netbsd.org/14531 12 */ 13 14 /* lint1-extra-flags: -aa -X 351 */ 15 16 typedef unsigned char u8_t; 17 typedef unsigned short u16_t; 18 typedef unsigned int u32_t; 19 typedef unsigned long long u64_t; 20 typedef signed char s8_t; 21 typedef signed short s16_t; 22 typedef signed int s32_t; 23 typedef signed long long s64_t; 24 25 _Bool cond; 26 char ch; 27 28 u8_t u8; 29 u16_t u16; 30 u32_t u32; 31 u64_t u64; 32 33 s8_t s8; 34 s16_t s16; 35 s32_t s32; 36 s64_t s64; 37 38 const char *ptr; 39 40 struct bit_fields { 41 unsigned u1:1; 42 unsigned u2:2; 43 unsigned u3:3; 44 unsigned u4:4; 45 unsigned u5:5; 46 unsigned u6:6; 47 unsigned u7:7; 48 unsigned u8:8; 49 unsigned u9:9; 50 unsigned u10:10; 51 unsigned u11:11; 52 unsigned u12:12; 53 unsigned u32:32; 54 } bits; 55 56 57 void 58 unsigned_to_unsigned(void) 59 { 60 /* expect+1: warning: conversion from 'unsigned short' to 'unsigned char' may lose accuracy [132] */ 61 u8 = u16; 62 /* expect+1: warning: conversion from 'unsigned int' to 'unsigned char' may lose accuracy [132] */ 63 u8 = u32; 64 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned char' may lose accuracy [132] */ 65 u8 = u64; 66 67 u16 = u8; 68 /* expect+1: warning: conversion from 'unsigned int' to 'unsigned short' may lose accuracy [132] */ 69 u16 = u32; 70 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned short' may lose accuracy [132] */ 71 u16 = u64; 72 73 u32 = u8; 74 u32 = u16; 75 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned int' may lose accuracy [132] */ 76 u32 = u64; 77 78 u64 = u8; 79 u64 = u16; 80 u64 = u32; 81 } 82 83 void 84 unsigned_to_signed(void) 85 { 86 /* expect+1: warning: conversion from 'unsigned short' to 'signed char' may lose accuracy [132] */ 87 s8 = u16; 88 /* expect+1: warning: conversion from 'unsigned int' to 'signed char' may lose accuracy [132] */ 89 s8 = u32; 90 /* expect+1: warning: conversion from 'unsigned long long' to 'signed char' may lose accuracy [132] */ 91 s8 = u64; 92 93 s16 = u8; 94 /* expect+1: warning: conversion from 'unsigned int' to 'short' may lose accuracy [132] */ 95 s16 = u32; 96 /* expect+1: warning: conversion from 'unsigned long long' to 'short' may lose accuracy [132] */ 97 s16 = u64; 98 99 s32 = u8; 100 s32 = u16; 101 /* expect+1: warning: conversion from 'unsigned long long' to 'int' may lose accuracy [132] */ 102 s32 = u64; 103 104 s64 = u8; 105 s64 = u16; 106 s64 = u32; 107 } 108 109 void 110 signed_to_unsigned(void) 111 { 112 /* expect+1: warning: conversion from 'short' to 'unsigned char' may lose accuracy [132] */ 113 u8 = s16; 114 /* expect+1: warning: conversion from 'int' to 'unsigned char' may lose accuracy [132] */ 115 u8 = s32; 116 /* expect+1: warning: conversion from 'long long' to 'unsigned char' may lose accuracy [132] */ 117 u8 = s64; 118 119 u16 = s8; 120 /* expect+1: warning: conversion from 'int' to 'unsigned short' may lose accuracy [132] */ 121 u16 = s32; 122 /* expect+1: warning: conversion from 'long long' to 'unsigned short' may lose accuracy [132] */ 123 u16 = s64; 124 125 u32 = s8; 126 u32 = s16; 127 /* expect+1: warning: conversion from 'long long' to 'unsigned int' may lose accuracy [132] */ 128 u32 = s64; 129 130 u64 = s8; 131 u64 = s16; 132 u64 = s32; 133 } 134 135 void 136 signed_to_signed(void) 137 { 138 /* expect+1: warning: conversion from 'short' to 'signed char' may lose accuracy [132] */ 139 s8 = s16; 140 /* expect+1: warning: conversion from 'int' to 'signed char' may lose accuracy [132] */ 141 s8 = s32; 142 /* expect+1: warning: conversion from 'long long' to 'signed char' may lose accuracy [132] */ 143 s8 = s64; 144 145 s16 = s8; 146 /* expect+1: warning: conversion from 'int' to 'short' may lose accuracy [132] */ 147 s16 = s32; 148 /* expect+1: warning: conversion from 'long long' to 'short' may lose accuracy [132] */ 149 s16 = s64; 150 151 s32 = s8; 152 s32 = s16; 153 /* expect+1: warning: conversion from 'long long' to 'int' may lose accuracy [132] */ 154 s32 = s64; 155 156 s64 = s8; 157 s64 = s16; 158 s64 = s32; 159 } 160 161 /* 162 * Before tree.c 1.268 from 2021-04-06, lint wrongly warned that conversion 163 * to _Bool might lose accuracy. C99 6.3.1.2 defines a special conversion 164 * rule from scalar to _Bool though by comparing the value to 0. 165 */ 166 _Bool 167 to_bool(long a, long b) 168 { 169 /* seen in fp_lib.h, function wideRightShiftWithSticky */ 170 return a | b; 171 } 172 173 /* ARGSUSED */ 174 const char * 175 cover_build_plus_minus(const char *arr, double idx) 176 { 177 if (idx > 0.0) 178 /* expect+2: error: operands of '+' have incompatible types 'pointer to const char' and 'double' [107] */ 179 /* expect+1: error: function 'cover_build_plus_minus' expects to return value [214] */ 180 return arr + idx; 181 return arr + (unsigned int)idx; 182 } 183 184 int 185 non_constant_expression(void) 186 { 187 /* 188 * Even though this variable definition looks like a constant, it 189 * does not fall within C's definition of an integer constant 190 * expression. Due to that, lint does not perform constant folding 191 * on the expression built from this variable and thus doesn't know 192 * that the conversion will always succeed. 193 */ 194 const int not_a_constant = 8; 195 /* expect+1: warning: conversion from 'unsigned long long' to 'int' may lose accuracy [132] */ 196 return not_a_constant * 8ULL; 197 } 198 199 /* 200 * PR 36668 notices that lint wrongly complains about the possible loss. 201 * 202 * The expression 'u8_t << 8' is guaranteed to fit into an 'u16_t', and its 203 * lower 8 bits are guaranteed to be clear. 'u16_t | u8_t' is guaranteed to 204 * fit into 'u16_t'. 205 * 206 * Since tree.c 1.444 from 2022-05-26, lint tracks simple bitwise and 207 * arithmetic constraints across a single expression. 208 */ 209 void 210 be16dec(void) 211 { 212 /* 213 * Before tree.c 1.444 from 2022-05-26, lint complained that the 214 * conversion from 'int' to 'unsigned short' may lose accuracy. 215 */ 216 u16 = (u16_t)u8 << 8 | u8; 217 } 218 219 /* 220 * Since tree.c 1.434 from 2022-04-19, lint infers the possible values of 221 * expressions of the form 'integer & constant', see can_represent. 222 */ 223 void 224 be32enc(void) 225 { 226 u8 = u32 >> 24 & 0xff; 227 u8 = u32 >> 16 & 0xff; 228 u8 = u32 >> 8 & 0xff; 229 u8 = u32 & 0xff; 230 } 231 232 void 233 test_ic_mult(void) 234 { 235 /* expect+1: warning: conversion from 'int' to 'unsigned char' may lose accuracy [132] */ 236 u8 = u8 * u8; 237 u16 = u8 * u8; 238 /* expect+1: warning: conversion from 'int' to 'unsigned short' may lose accuracy [132] */ 239 u16 = u16 * u8; 240 u32 = u16 * u16; 241 242 u32 = u16 * 65537ULL; 243 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned int' may lose accuracy [132] */ 244 u32 = u16 * 65538ULL; 245 246 u16 = 0 * u16; 247 u16 = 1 * u16; 248 /* expect+1: warning: conversion from 'int' to 'unsigned short' may lose accuracy [132] */ 249 u16 = 2 * u16; 250 251 // from __BITS, __SHIFTIN, __SHIFTOUT 252 u32 = (u16 & 1023ULL) / 1ULL * 1024ULL | (u16 & 1023ULL) / 1ULL * 1ULL; 253 254 s8 = 1 * s8; 255 s16 = 1 * s16; 256 s32 = 1 * s32; 257 s64 = 1 * s64; 258 259 /* expect+1: warning: conversion from 'int' to 'signed char' may lose accuracy [132] */ 260 s8 = 2 * s8; 261 /* expect+1: warning: conversion from 'int' to 'short' may lose accuracy [132] */ 262 s16 = 2 * s16; 263 // No warning, as there is no narrowing conversion. 264 s32 = 2 * s32; 265 // No warning, as there is no narrowing conversion. 266 s64 = 2 * s64; 267 268 /* expect+1: warning: conversion from 'int' to 'signed char' may lose accuracy [132] */ 269 s8 = -1 * s8; 270 /* expect+1: warning: conversion from 'int' to 'short' may lose accuracy [132] */ 271 s16 = -1 * s16; 272 // No warning, as there is no narrowing conversion. 273 s32 = -1 * s32; 274 // No warning, as there is no narrowing conversion. 275 s64 = -1 * s64; 276 } 277 278 void 279 test_ic_div(void) 280 { 281 u8 = u8 / u8; 282 /* expect+1: warning: conversion from 'int' to 'unsigned char' may lose accuracy [132] */ 283 u8 = u16 / u8; 284 u16 = u8 / u8; 285 u16 = u32 / 65536; 286 /* expect+1: warning: conversion from 'unsigned int' to 'unsigned short' may lose accuracy [132] */ 287 u16 = u32 / 65535; 288 289 s8 = s8 / 1; 290 s16 = s16 / 1; 291 s32 = s32 / 1; 292 s64 = s64 / 1; 293 294 /* expect+1: warning: conversion from 'int' to 'signed char' may lose accuracy [132] */ 295 s8 = s8 / -1; 296 /* expect+1: warning: conversion from 'int' to 'short' may lose accuracy [132] */ 297 s16 = s16 / -1; 298 // No warning, as there is no narrowing conversion. 299 s32 = s32 / -1; 300 // No warning, as there is no narrowing conversion. 301 s64 = s64 / -1; 302 } 303 304 void 305 test_ic_mod(void) 306 { 307 /* The result is between 0 and 254. */ 308 u8 = u64 % u8; 309 310 /* The result is between 0 and 255. */ 311 u8 = u64 % 256; 312 313 /* The result is between 0 and 256. */ 314 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned char' may lose accuracy [132] */ 315 u8 = u64 % 257; 316 317 /* The result is between 0 and 1000. */ 318 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned char' may lose accuracy [132] */ 319 u8 = u64 % 1000; 320 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned int:9' may lose accuracy [132] */ 321 bits.u9 = u64 % 1000; 322 bits.u10 = u64 % 1000; 323 u16 = u64 % 1000; 324 325 s8 = s16 % s8; 326 /* expect+1: warning: conversion from 'int' to 'signed char' may lose accuracy [132] */ 327 s8 = s16 % s16; 328 s8 = s64 % 1; 329 s8 = s64 % (s16 & 1); 330 /* expect+1: warning: conversion from 'long long' to 'signed char' may lose accuracy [132] */ 331 s8 = s64 % (s16 & 0); 332 s8 = (s64 & 0x7f) % s64; 333 /* expect+1: warning: conversion from 'long long' to 'signed char' may lose accuracy [132] */ 334 s8 = (s64 & 0xff) % s64; 335 } 336 337 void 338 test_ic_plus(void) 339 { 340 /* expect+1: warning: conversion from 'long long' to 'signed char' may lose accuracy [132] */ 341 s8 = -129 + s64 % 1; 342 s8 = -128 + s64 % 1; 343 s8 = 127 + s64 % 1; 344 /* expect+1: warning: conversion from 'long long' to 'signed char' may lose accuracy [132] */ 345 s8 = 128 + s64 % 1; 346 347 /* expect+2: warning: conversion of negative constant -129 to unsigned type 'unsigned long long' [222] */ 348 /* expect+1: warning: conversion from 'unsigned long long' to 'signed char' may lose accuracy [132] */ 349 s8 = -129 + u64 % 1; 350 /* expect+2: warning: conversion of negative constant -128 to unsigned type 'unsigned long long' [222] */ 351 /* expect+1: warning: conversion from 'unsigned long long' to 'signed char' may lose accuracy [132] */ 352 s8 = -128 + u64 % 1; 353 s8 = 127 + u64 % 1; 354 /* expect+1: warning: conversion from 'unsigned long long' to 'signed char' may lose accuracy [132] */ 355 s8 = 128 + u64 % 1; 356 357 u8 = 0 + u64 % 1; 358 u8 = 255 + u64 % 1; 359 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned char' may lose accuracy [132] */ 360 u8 = 256 + u64 % 1; 361 362 u8 = s8 + 0x80; 363 u16 = s16 + 0x8000; 364 u32 = s32 + 0x80000000; 365 u64 = s64 + 0x8000000000000000; 366 367 // XXX: No warnings since portable_rank_cmp is the same for both sides. 368 bits.u11 = bits.u10 + bits.u10 + 1; 369 bits.u11 = bits.u10 + bits.u10 + 2; 370 bits.u11 = bits.u10 + 1024; 371 bits.u11 = bits.u10 + 1025; 372 373 u8 = bits.u7 + bits.u7 + 1; 374 /* expect+1: warning: conversion from 'int' to 'unsigned char' may lose accuracy [132] */ 375 u8 = bits.u7 + bits.u7 + 2; 376 u8 = bits.u7 + 128; 377 /* expect+1: warning: conversion from 'int' to 'unsigned char' may lose accuracy [132] */ 378 u8 = bits.u7 + 129; 379 380 // The result of the second '+' wraps around, thus the warning, 381 // even though the final result fits in a u16. 382 /* expect+1: warning: conversion from 'unsigned int' to 'unsigned short' may lose accuracy [132] */ 383 u16 = u32 % 0x00010000 + 0x80000000 + 0x80000000; 384 385 /* expect+1: warning: conversion from 'unsigned int' to 'unsigned short' may lose accuracy [132] */ 386 u16 = u32 % 0x00010000 + 0xffff8000; 387 /* expect+1: warning: conversion from 'unsigned int' to 'short' may lose accuracy [132] */ 388 s16 = u32 % 0x00010000 + 0xffff8000; 389 390 /* expect+1: warning: conversion from 'long long' to 'unsigned short' may lose accuracy [132] */ 391 u16 = s64 % 0x00010000 + 0xffffffffLL + -0xffffffffLL; 392 /* expect+1: warning: conversion from 'int' to 'unsigned short' may lose accuracy [132] */ 393 u16 = s32 % 0x00010000 + 0x7fff0000 + -0x7fff0000; 394 /* expect+1: warning: conversion from 'unsigned int' to 'unsigned short' may lose accuracy [132] */ 395 u16 = u32 % 0x00010000 + 0xffff0000 + 0x00010000; 396 397 s8 = '0' + s64 % 10; 398 399 ptr = ptr + 3; 400 } 401 402 void 403 test_ic_minus(void) 404 { 405 // Shift the range [0x00 to 0xff] to [-0x80 to 0x7f]. 406 s8 = (s64 & 0xff) - 0x80; 407 408 // Sign-extend the lowest bits. 409 s8 = ((s64 & 0xff) ^ 0x80) - 0x80; 410 s16 = ((s64 & 0xffff) ^ 0x8000) - 0x8000; 411 /* expect+1: warning: extra bits set to 0 in conversion of 'unsigned int' to 'long long', op '&' [309] */ 412 s32 = ((s64 & 0xffffffff) ^ 0x80000000) - 0x80000000; 413 414 // Trying to sign-extend, but with off-by-one errors. 415 /* expect+1: warning: conversion from 'long long' to 'signed char' may lose accuracy [132] */ 416 s8 = ((s64 & 0xff) ^ 0x80) - 0x7f; 417 /* expect+1: warning: conversion from 'long long' to 'signed char' may lose accuracy [132] */ 418 s8 = ((s64 & 0xff) ^ 0x80) - 0x81; 419 420 u8 = s8 - -0x80; 421 u16 = s16 - -0x8000; 422 u32 = s32 - -0x80000000; 423 u64 = s64 - -0x8000000000000000; 424 425 ptr = ptr - 3; 426 s64 = ptr + 3 - ptr; 427 /* expect+1: warning: conversion from 'long' to 'unsigned int' may lose accuracy [132] */ 428 u32 = ptr + 3 - ptr; 429 } 430 431 void 432 test_ic_shl(void) 433 { 434 u64 = u64 << u64; 435 s64 = s64 << s64; 436 437 u16 = u8 << 8; 438 /* expect+1: warning: conversion from 'int' to 'unsigned short' may lose accuracy [132] */ 439 u16 = u8 << 9; 440 u32 = u16 << 16; 441 // XXX: missing warning as UINT has the same rank as INT, see portable_rank_cmp. 442 u32 = u16 << 17; 443 /* expect+1: warning: shift amount 56 is greater than bit-size 32 of 'int' [122] */ 444 u64 = u8 << 56; 445 u64 = (u64_t)u8 << 56; 446 // XXX: missing warning, as the operand types of '=' are the same, thus no conversion. 447 u64 = (u64_t)u8 << 57; 448 /* expect+1: warning: shift amount 48 is greater than bit-size 32 of 'int' [122] */ 449 u64 = u16 << 48; 450 u64 = (u64_t)u16 << 48; 451 // XXX: missing warning, as the operand types of '=' are the same, thus no conversion. 452 u64 = (u64_t)u16 << 49; 453 /* expect+1: warning: shift amount 32 equals bit-size of 'unsigned int' [267] */ 454 u64 = u32 << 32; 455 u64 = (u64_t)u32 << 32; 456 // XXX: missing warning, as the operand types of '=' are the same, thus no conversion. 457 u64 = (u64_t)u32 << 33; 458 } 459 460 void 461 test_ic_shr(void) 462 { 463 u64 = u64 >> u64; 464 s64 = s64 >> s64; 465 466 u32 = u64 >> 32; 467 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned int' may lose accuracy [132] */ 468 u32 = u64 >> 31; 469 u16 = u64 >> 48; 470 u16 = u32 >> 16; 471 u8 = u64 >> 56; 472 u8 = u32 >> 24; 473 u8 = u16 >> 8; 474 475 /* 476 * No matter whether the big integer is signed or unsigned, the 477 * result of '&' is guaranteed to be an unsigned value. 478 */ 479 u8 = (s64 & 0xf0) >> 4; 480 u8 = (s8 & 0xf0) >> 4; 481 } 482 483 void 484 test_ic_bitand(void) 485 { 486 u8 = u8 & u16; 487 488 /* expect+1: warning: conversion from 'unsigned int' to 'unsigned char' may lose accuracy [132] */ 489 u8 = u16 & u32; 490 } 491 492 void 493 test_ic_bitxor(void) 494 { 495 /* expect+1: warning: conversion from 'int' to 'unsigned char' may lose accuracy [132] */ 496 u8 = u8 ^ u16; 497 u16 = u8 ^ u16; 498 499 // Sign-extend. 500 s8 = (u8 ^ 0x80) - 0x80; 501 s16 = (u16 ^ 0x8000) - 0x8000; 502 s32 = (u32 ^ 0x80000000) - 0x80000000; 503 s64 = (u64 ^ 0x8000000000000000) - 0x8000000000000000; 504 } 505 506 void 507 test_ic_bitor(void) 508 { 509 /* expect+1: warning: conversion from 'int' to 'unsigned char' may lose accuracy [132] */ 510 u8 = u8 | u16; 511 u16 = u8 | u16; 512 /* expect+1: warning: conversion from 'unsigned int' to 'unsigned short' may lose accuracy [132] */ 513 u16 = u8 | u32; 514 u32 = u8 | u32; 515 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned int' may lose accuracy [132] */ 516 u32 = u8 | u64; 517 u64 = u8 | u64; 518 } 519 520 void 521 test_ic_quest_colon(char c1, char c2) 522 { 523 /* Both operands are representable as char. */ 524 ch = cond ? '?' : ':'; 525 526 /* 527 * Both operands are representable as char. Clang-Tidy 17 wrongly 528 * warns about a narrowing conversion from 'int' to signed type 529 * 'char'. 530 */ 531 ch = cond ? c1 : c2; 532 533 /* 534 * Mixing s8 and u8 results in a number from -128 to 255, which neither 535 * fits in s8 nor u8. 536 */ 537 /* expect+1: warning: conversion from 'int' to 'signed char' may lose accuracy [132] */ 538 s8 = cond ? s8 : u8; 539 /* expect+1: warning: conversion from 'int' to 'unsigned char' may lose accuracy [132] */ 540 u8 = cond ? s8 : u8; 541 } 542 543 void 544 test_ic_con(void) 545 { 546 /* expect+1: warning: assignment of negative constant -1 to unsigned type 'unsigned char' [164] */ 547 u8 = -1; 548 u8 = 0; 549 u8 = 255; 550 /* expect+1: warning: constant truncated by assignment [165] */ 551 u8 = 256; 552 553 /* expect+1: warning: conversion of 'int' to 'signed char' is out of range [119] */ 554 s8 = -129; 555 s8 = -128; 556 s8 = 127; 557 /* expect+1: warning: conversion of 'int' to 'signed char' is out of range [119] */ 558 s8 = 128; 559 } 560 561 void 562 test_ic_cvt(void) 563 { 564 u16 = (u32 & 0x0000ff00); 565 u16 = (u32_t)(u32 & 0x0000ff00); 566 u16 = (u16_t)u32; 567 u16 = (u8_t)(u32 & 0xffff) << 8; 568 u16 = (int)3.0; 569 570 u8 = (u8_t)(u64 & 0x0f); 571 u8 = (u8_t)(u64 & 0x0f) << 4; 572 /* expect+1: warning: conversion from 'int' to 'unsigned char' may lose accuracy [132] */ 573 u8 = (u8_t)(u64 & 0x0f) << 5; 574 } 575 576 unsigned char 577 test_bit_fields(unsigned long long m) 578 { 579 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned int:3' may lose accuracy [132] */ 580 bits.u3 = bits.u32 & m; 581 582 bits.u5 = bits.u3 & m; 583 bits.u32 = bits.u5 & m; 584 585 /* expect+1: warning: conversion from 'unsigned long long' to 'unsigned char' may lose accuracy [132] */ 586 return bits.u32 & m; 587 } 588 589 void 590 compare_bit_field_to_integer_constant(void) 591 { 592 static _Bool b; 593 static struct { 594 short s16:15; 595 unsigned short u16:15; 596 int s32:15; 597 unsigned u32:15; 598 long long s64:15; 599 unsigned long long u64:15; 600 } s; 601 602 // Since decl.c 1.180 from 2021-05-02 and before tree.c 1.624 from 603 // 2024-03-12, lint warned about a possible loss of accuracy [132] 604 // when promoting an 'unsigned long long' bit-field to 'int'. 605 b = s.s16 == 0; 606 b = s.u16 == 0; 607 b = s.s32 == 0; 608 b = s.u32 == 0; 609 b = s.s64 == 0; 610 b = s.u64 == 0; 611 b = !b; 612 } 613 614 /* 615 * Before tree.c 1.626 from 2024-03-26, the usual arithmetic conversions for 616 * bit-field types with the same base type but different widths simply took 617 * the type of the left operand, leading to wrong warnings about loss of 618 * accuracy when the right operand was wider than the left operand. 619 */ 620 void 621 binary_operators_on_bit_fields(void) 622 { 623 struct { 624 u64_t u15:15; 625 u64_t u48:48; 626 u64_t u64; 627 } s = { 0, 0, 0 }; 628 629 u64 = s.u15 | s.u48; 630 u64 = s.u48 | s.u15; 631 u64 = s.u15 | s.u48 | s.u64; 632 u64 = s.u64 | s.u48 | s.u15; 633 cond = (s.u15 | s.u48 | s.u64) != 0; 634 cond = (s.u64 | s.u48 | s.u15) != 0; 635 636 // Before tree.c from 1.638 from 2024-05-01, lint wrongly warned: 637 // warning: conversion of 'int' to 'int:4' is out of range [119] 638 s32 = 8 - bits.u3; 639 } 640 641 unsigned char 642 combine_arithmetic_and_bit_operations(void) 643 { 644 return 0xc0 | (u32 & 0x07c0) / 64; 645 } 646
Indexes created Thu Oct 02 10:09:58 GMT 2025