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* stdlib/strtol.c: Optimize inner loop of long long versions.
This commit is contained in:
Ulrich Drepper
1999-05-15 23:31:55 +00:00
parent 26262bc29e
commit 66f6a52b79
4 changed files with 90 additions and 52 deletions
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72
stdlib/strtol.c
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@ -1,5 +1,5 @@
/* Convert string representation of a number into an integer value.
Copyright (C) 1991, 92, 94, 95, 96, 97, 98 Free Software Foundation, Inc.
Copyright (C) 1991,92,94,95,96,97,98,99 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -344,27 +344,63 @@ INTERNAL (strtol) (nptr, endptr, base, group LOCALE_PARAM)
overflow = 0;
i = 0;
for (c = *s; c != L_('\0'); c = *++s)
c = *s;
if (sizeof (long int) != sizeof (LONG int))
{
if (s == end)
break;
if (c >= L_('0') && c <= L_('9'))
c -= L_('0');
else if (ISALPHA (c))
c = TOUPPER (c) - L_('A') + 10;
else
break;
if ((int) c >= base)
break;
/* Check for overflow. */
if (i > cutoff || (i == cutoff && c > cutlim))
overflow = 1;
else
unsigned long int j = 0;
for (;c != L_('\0'); c = *++s)
{
i *= (unsigned LONG int) base;
i += c;
if (s == end)
break;
if (c >= L_('0') && c <= L_('9'))
c -= L_('0');
else if (ISALPHA (c))
c = TOUPPER (c) - L_('A') + 10;
else
break;
if ((int) c >= base)
break;
/* Note that we never can have an overflow. */
else
{
unsigned long int jj = j * (unsigned long int) base;
if (jj < j)
{
/* We have an overflow. Now use the long representation. */
i = (unsigned LONG int) j;
goto use_long;
}
j = jj;
j += c;
}
}
i = (unsigned LONG int) j;
}
else
for (;c != L_('\0'); c = *++s)
{
if (s == end)
break;
if (c >= L_('0') && c <= L_('9'))
c -= L_('0');
else if (ISALPHA (c))
c = TOUPPER (c) - L_('A') + 10;
else
break;
if ((int) c >= base)
break;
/* Check for overflow. */
if (i > cutoff || (i == cutoff && c > cutlim))
overflow = 1;
else
{
use_long:
i *= (unsigned LONG int) base;
i += c;
}
}
/* Check if anything actually happened. */
if (s == save)