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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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2
ChangeLog
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@ -1,5 +1,7 @@
1999-05-15 Ulrich Drepper <drepper@cygnus.com>
* stdlib/strtol.c: Optimize inner loop of long long versions.
* sysdeps/gnu/utmpx.h: Add needed type definitions according to
Unix98. Add forward declaration of struct utmp.

34
FAQ
View File

@ -226,8 +226,8 @@ to use EGCS. Comparing the sizes of glibc on Intel compiled with a recent
EGCS and gcc 2.8.1 shows this:
text data bss dec hex filename
egcs-2.93.10 862897 15944 12824 891665 d9b11 libc.so
gcc-2.8.1 959965 16468 12152 988585 f15a9 libc.so
egcs-2.93.10 862897 15944 12824 891665 d9b11 libc.so
gcc-2.8.1 959965 16468 12152 988585 f15a9 libc.so
Make up your own decision.
@ -838,7 +838,7 @@ ypbind. ypbind 3.3 and older versions don't always remove these files, so
glibc will continue to use them. Other BSD versions seem to work correctly.
Until ypbind 3.4 is released, you can find a patch at
ftp://ftp.kernel.org/pub/linux/utils/net/NIS/ypbind-3.3-glibc4.diff.gz
<ftp://ftp.kernel.org/pub/linux/utils/net/NIS/ypbind-3.3-glibc4.diff.gz>
2.14. Under Linux/Alpha, I always get "do_ypcall: clnt_call:
@ -929,7 +929,7 @@ gcc-2.8.1 together with libstdc++ 2.8.1.1. egcs 1.1 has the better C++
support and works directly with glibc 2.1. If you use gcc-2.8.1 with
libstdc++ 2.8.1.1, you need to modify libstdc++ a bit. A patch is available
as:
ftp://alpha.gnu.org/gnu/libstdc++-2.8.1.1-glibc2.1-diff.gz
<ftp://alpha.gnu.org/gnu/libstdc++-2.8.1.1-glibc2.1-diff.gz>
Please note that libg++ 2.7.2 (and the Linux Versions 2.7.2.x) doesn't work
very well with the GNU C library due to vtable thunks. If you're upgrading
@ -1071,7 +1071,7 @@ The glibc-compat add-on will provide the libcompat.a library, the older
nss modules, and a few other files. Together, they should make it
possible to do development with old static libraries on a glibc 2.1
system. This add-on is still in development. You can get it from
ftp://alpha.gnu.org/gnu/glibc-compat-2.1.tar.gz
<ftp://alpha.gnu.org/gnu/glibc-compat-2.1.tar.gz>
but please keep in mind that it is experimental.
@ -1346,7 +1346,7 @@ This disables the optimization for that specific call.
stdin/stdout/stderr. Why?
{RM,AJ} Constructs like:
static FILE *InPtr = stdin;
static FILE *InPtr = stdin;
lead to this message. This is correct behaviour with glibc since stdin is
not a constant expression. Please note that a strict reading of ISO C does
@ -1361,17 +1361,17 @@ this way were versioning problems with the size of the FILE structure.
To fix those programs you've got to initialize the variable at run time.
This can be done, e.g. in main, like:
static FILE *InPtr;
int main(void)
{
InPtr = stdin;
}
static FILE *InPtr;
int main(void)
{
InPtr = stdin;
}
or by constructors (beware this is gcc specific):
static FILE *InPtr;
static void inPtr_construct (void) __attribute__((constructor));
static void inPtr_construct (void) { InPtr = stdin; }
static FILE *InPtr;
static void inPtr_construct (void) __attribute__((constructor));
static void inPtr_construct (void) { InPtr = stdin; }
3.10. I can't compile with gcc -traditional (or
@ -1380,9 +1380,9 @@ static void inPtr_construct (void) { InPtr = stdin; }
{AJ} glibc2 does break -traditional and -traditonal-cpp - and will continue
to do so. For example constructs of the form:
enum {foo
#define foo foo
}
enum {foo
#define foo foo
}
are useful for debugging purposes (you can use foo with your debugger that's
why we need the enum) and for compatibility (other systems use defines and

34
FAQ.in
View File

@ -68,8 +68,8 @@ to use EGCS. Comparing the sizes of glibc on Intel compiled with a recent
EGCS and gcc 2.8.1 shows this:
text data bss dec hex filename
egcs-2.93.10 862897 15944 12824 891665 d9b11 libc.so
gcc-2.8.1 959965 16468 12152 988585 f15a9 libc.so
egcs-2.93.10 862897 15944 12824 891665 d9b11 libc.so
gcc-2.8.1 959965 16468 12152 988585 f15a9 libc.so
Make up your own decision.
@ -651,7 +651,7 @@ ypbind. ypbind 3.3 and older versions don't always remove these files, so
glibc will continue to use them. Other BSD versions seem to work correctly.
Until ypbind 3.4 is released, you can find a patch at
ftp://ftp.kernel.org/pub/linux/utils/net/NIS/ypbind-3.3-glibc4.diff.gz
<ftp://ftp.kernel.org/pub/linux/utils/net/NIS/ypbind-3.3-glibc4.diff.gz>
?? Under Linux/Alpha, I always get "do_ypcall: clnt_call:
RPC: Unable to receive; errno = Connection refused" when using NIS.
@ -736,7 +736,7 @@ gcc-2.8.1 together with libstdc++ 2.8.1.1. egcs 1.1 has the better C++
support and works directly with glibc 2.1. If you use gcc-2.8.1 with
libstdc++ 2.8.1.1, you need to modify libstdc++ a bit. A patch is available
as:
ftp://alpha.gnu.org/gnu/libstdc++-2.8.1.1-glibc2.1-diff.gz
<ftp://alpha.gnu.org/gnu/libstdc++-2.8.1.1-glibc2.1-diff.gz>
Please note that libg++ 2.7.2 (and the Linux Versions 2.7.2.x) doesn't work
very well with the GNU C library due to vtable thunks. If you're upgrading
@ -872,7 +872,7 @@ The glibc-compat add-on will provide the libcompat.a library, the older
nss modules, and a few other files. Together, they should make it
possible to do development with old static libraries on a glibc 2.1
system. This add-on is still in development. You can get it from
ftp://alpha.gnu.org/gnu/glibc-compat-2.1.tar.gz
<ftp://alpha.gnu.org/gnu/glibc-compat-2.1.tar.gz>
but please keep in mind that it is experimental.
?? Why is extracting files via tar so slow?
@ -1135,7 +1135,7 @@ This disables the optimization for that specific call.
stdin/stdout/stderr. Why?
{RM,AJ} Constructs like:
static FILE *InPtr = stdin;
static FILE *InPtr = stdin;
lead to this message. This is correct behaviour with glibc since stdin is
not a constant expression. Please note that a strict reading of ISO C does
@ -1150,17 +1150,17 @@ this way were versioning problems with the size of the FILE structure.
To fix those programs you've got to initialize the variable at run time.
This can be done, e.g. in main, like:
static FILE *InPtr;
int main(void)
{
InPtr = stdin;
}
static FILE *InPtr;
int main(void)
{
InPtr = stdin;
}
or by constructors (beware this is gcc specific):
static FILE *InPtr;
static void inPtr_construct (void) __attribute__((constructor));
static void inPtr_construct (void) { InPtr = stdin; }
static FILE *InPtr;
static void inPtr_construct (void) __attribute__((constructor));
static void inPtr_construct (void) { InPtr = stdin; }
?? I can't compile with gcc -traditional (or
@ -1169,9 +1169,9 @@ static void inPtr_construct (void) { InPtr = stdin; }
{AJ} glibc2 does break -traditional and -traditonal-cpp - and will continue
to do so. For example constructs of the form:
enum {foo
#define foo foo
}
enum {foo
#define foo foo
}
are useful for debugging purposes (you can use foo with your debugger that's
why we need the enum) and for compatibility (other systems use defines and

72
stdlib/strtol.c
View File

@ -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)