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[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>
This commit is contained in:
Martin Schwidefsky 2008-02-19 15:29:28 +01:00
parent 03513bccad
commit a22fb7ff12
1 changed files with 12 additions and 8 deletions
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20
include/asm-s390/bitops.h
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@ -456,16 +456,18 @@ static inline unsigned long __ffz_word_loop(const unsigned long *addr,
asm volatile(
#ifndef __s390x__
" ahi %1,31\n"
" srl %1,5\n"
" ahi %1,-1\n"
" sra %1,5\n"
" jz 1f\n"
"0: c %2,0(%0,%3)\n"
" jne 1f\n"
" la %0,4(%0)\n"
" brct %1,0b\n"
"1:\n"
#else
" aghi %1,63\n"
" srlg %1,%1,6\n"
" aghi %1,-1\n"
" srag %1,%1,6\n"
" jz 1f\n"
"0: cg %2,0(%0,%3)\n"
" jne 1f\n"
" la %0,8(%0)\n"
@ -491,16 +493,18 @@ static inline unsigned long __ffs_word_loop(const unsigned long *addr,
asm volatile(
#ifndef __s390x__
" ahi %1,31\n"
" srl %1,5\n"
" ahi %1,-1\n"
" sra %1,5\n"
" jz 1f\n"
"0: c %2,0(%0,%3)\n"
" jne 1f\n"
" la %0,4(%0)\n"
" brct %1,0b\n"
"1:\n"
#else
" aghi %1,63\n"
" srlg %1,%1,6\n"
" aghi %1,-1\n"
" srag %1,%1,6\n"
" jz 1f\n"
"0: cg %2,0(%0,%3)\n"
" jne 1f\n"
" la %0,8(%0)\n"