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alpha: Use saturating arithmetic in memchr

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Richard Henderson 2017-02-01 14:37:58 -08:00
parent 4283b38725
commit 9c8e644853
2 changed files with 9 additions and 1 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2017-02-01 Richard Henderson <rth@twiddle.net>
* sysdeps/alpha/memchr.c (__memchr): Use saturating arithmetic
adjusting the byte count.
2017-02-01 Andreas Schwab <schwab@linux-m68k.org> 2017-02-01 Andreas Schwab <schwab@linux-m68k.org>
* conform/Makefile (linknamespace-libs): Define. * conform/Makefile (linknamespace-libs): Define.

5
sysdeps/alpha/memchr.c
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@ -53,7 +53,10 @@ __memchr (const void *s, int xc, size_t n)
/* Align the source, and decrement the count by the number /* Align the source, and decrement the count by the number
of bytes searched in the first word. */ of bytes searched in the first word. */
s_align = (const word *)((word)s & -8); s_align = (const word *)((word)s & -8);
n += ((word)s & 7); {
size_t inc = n + ((word)s & 7);
n = inc | -(inc < n);
}
/* Deal with misalignment in the first word for the comparison. */ /* Deal with misalignment in the first word for the comparison. */
mask = (1ul << ((word)s & 7)) - 1; mask = (1ul << ((word)s & 7)) - 1;