| … | |
… | |
| 455 | For example: |
455 | For example: |
| 456 | |
456 | |
| 457 | ecb_popcount32 (7) = 3 |
457 | ecb_popcount32 (7) = 3 |
| 458 | ecb_popcount32 (255) = 8 |
458 | ecb_popcount32 (255) = 8 |
| 459 | |
459 | |
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460 | =item uint8_t ecb_bitrev8 (uint8_t x) |
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461 | |
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462 | =item uint16_t ecb_bitrev16 (uint16_t x) |
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463 | |
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464 | =item uint32_t ecb_bitrev32 (uint32_t x) |
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465 | |
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466 | Reverses the bits in x, i.e. the MSB becomes the LSB, MSB-1 becomes LSB+1 |
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467 | and so on. |
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468 | |
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469 | Example: |
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470 | |
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471 | ecb_bitrev8 (0xa7) = 0xea |
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472 | ecb_bitrev32 (0xffcc4411) = 0x882233ff |
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473 | |
| 460 | =item uint32_t ecb_bswap16 (uint32_t x) |
474 | =item uint32_t ecb_bswap16 (uint32_t x) |
| 461 | |
475 | |
| 462 | =item uint32_t ecb_bswap32 (uint32_t x) |
476 | =item uint32_t ecb_bswap32 (uint32_t x) |
| 463 | |
477 | |
| 464 | =item uint64_t ecb_bswap64 (uint64_t x) |
478 | =item uint64_t ecb_bswap64 (uint64_t x) |
| … | |
… | |
| 521 | change direction for negative values: |
535 | change direction for negative values: |
| 522 | |
536 | |
| 523 | for (m = -100; m <= 100; ++m) |
537 | for (m = -100; m <= 100; ++m) |
| 524 | int elem = myarray [ecb_mod (m, ecb_array_length (myarray))]; |
538 | int elem = myarray [ecb_mod (m, ecb_array_length (myarray))]; |
| 525 | |
539 | |
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540 | =item x = ecb_div_rd (val, div) |
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541 | |
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542 | =item x = ecb_div_ru (val, div) |
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543 | |
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544 | Returns C<val> divided by C<div> rounded down or up, respectively. |
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545 | C<val> and C<div> must have integer types and C<div> must be strictly |
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546 | positive. Note that these functions are implemented with macros in C |
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547 | and with function templates in C++. |
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548 | |
| 526 | =back |
549 | =back |
| 527 | |
550 | |
| 528 | =head2 UTILITY |
551 | =head2 UTILITY |
| 529 | |
552 | |
| 530 | =over 4 |
553 | =over 4 |
