diff options
| -rw-r--r-- | sysdeps/s390/memchr-z900.S | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/sysdeps/s390/memchr-z900.S b/sysdeps/s390/memchr-z900.S index 90b8a32dd6..72fd9e023f 100644 --- a/sysdeps/s390/memchr-z900.S +++ b/sysdeps/s390/memchr-z900.S @@ -44,12 +44,25 @@ ENTRY(MEMCHR_Z900_G5) LGHI %r0,0xff NGR %r0,%r3 LGR %r1,%r2 +# if ! defined __s390x__ + tmlh %r4,32768 + jo 3f /* Jump away if n >= 0x80000000 */ +# endif la %r2,0(%r4,%r1) 0: srst %r2,%r1 jo 0b brc 13,1f SLGR %r2,%r2 1: br %r14 +# if ! defined __s390x__ + /* On s390 (31bit), the pointer to the first byte after s (stored in + r2) always wraps around with n >= 0x80000000 and can lead to stop + searching before end of s. Thus just use r2=0 in this case. + If r2 < r1, the srst instruction stops searching with cc=2 "not + found" when wrapping around from top address to zero. */ +3: SLGR %r2,%r2 + j 0b +# endif END(MEMCHR_Z900_G5) # if ! HAVE_MEMCHR_IFUNC |