diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-02-19 09:29:28 -0500 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-02-19 09:29:33 -0500 |
| commit | a22fb7ff1259e6ee87d0ba3559c9f7b7d0cb20d2 (patch) | |
| tree | 46926139f2bd05aa45ce842ef8268474561fb11a /include/asm-s390/bitops.h | |
| parent | 03513bccad33667ed738cfd96dc5757e539e0bdb (diff) | |
[S390] find bit corner case.
Fix [ext2_]find_first_[zero_]bit for the corner case of an all clear
or all set bit field by always handling that last word of the bit field
with __ffz_word/__ffs_word.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'include/asm-s390/bitops.h')
| -rw-r--r-- | include/asm-s390/bitops.h | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/include/asm-s390/bitops.h b/include/asm-s390/bitops.h index ab83c844d04c..965394e69452 100644 --- a/include/asm-s390/bitops.h +++ b/include/asm-s390/bitops.h | |||
| @@ -456,16 +456,18 @@ static inline unsigned long __ffz_word_loop(const unsigned long *addr, | |||
| 456 | 456 | ||
| 457 | asm volatile( | 457 | asm volatile( |
| 458 | #ifndef __s390x__ | 458 | #ifndef __s390x__ |
| 459 | " ahi %1,31\n" | 459 | " ahi %1,-1\n" |
| 460 | " srl %1,5\n" | 460 | " sra %1,5\n" |
| 461 | " jz 1f\n" | ||
| 461 | "0: c %2,0(%0,%3)\n" | 462 | "0: c %2,0(%0,%3)\n" |
| 462 | " jne 1f\n" | 463 | " jne 1f\n" |
| 463 | " la %0,4(%0)\n" | 464 | " la %0,4(%0)\n" |
| 464 | " brct %1,0b\n" | 465 | " brct %1,0b\n" |
| 465 | "1:\n" | 466 | "1:\n" |
| 466 | #else | 467 | #else |
| 467 | " aghi %1,63\n" | 468 | " aghi %1,-1\n" |
| 468 | " srlg %1,%1,6\n" | 469 | " srag %1,%1,6\n" |
| 470 | " jz 1f\n" | ||
| 469 | "0: cg %2,0(%0,%3)\n" | 471 | "0: cg %2,0(%0,%3)\n" |
| 470 | " jne 1f\n" | 472 | " jne 1f\n" |
| 471 | " la %0,8(%0)\n" | 473 | " la %0,8(%0)\n" |
| @@ -491,16 +493,18 @@ static inline unsigned long __ffs_word_loop(const unsigned long *addr, | |||
| 491 | 493 | ||
| 492 | asm volatile( | 494 | asm volatile( |
| 493 | #ifndef __s390x__ | 495 | #ifndef __s390x__ |
| 494 | " ahi %1,31\n" | 496 | " ahi %1,-1\n" |
| 495 | " srl %1,5\n" | 497 | " sra %1,5\n" |
| 498 | " jz 1f\n" | ||
| 496 | "0: c %2,0(%0,%3)\n" | 499 | "0: c %2,0(%0,%3)\n" |
| 497 | " jne 1f\n" | 500 | " jne 1f\n" |
| 498 | " la %0,4(%0)\n" | 501 | " la %0,4(%0)\n" |
| 499 | " brct %1,0b\n" | 502 | " brct %1,0b\n" |
| 500 | "1:\n" | 503 | "1:\n" |
| 501 | #else | 504 | #else |
| 502 | " aghi %1,63\n" | 505 | " aghi %1,-1\n" |
| 503 | " srlg %1,%1,6\n" | 506 | " srag %1,%1,6\n" |
| 507 | " jz 1f\n" | ||
| 504 | "0: cg %2,0(%0,%3)\n" | 508 | "0: cg %2,0(%0,%3)\n" |
| 505 | " jne 1f\n" | 509 | " jne 1f\n" |
| 506 | " la %0,8(%0)\n" | 510 | " la %0,8(%0)\n" |