Contributed by Axis Communications.
Written by Hans-Peter Nilsson <hp@axis.se>, c:a 1992.
- Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999, 2000, 2001, 2002,
+ 2005, 2009 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
-Free Software Foundation; either version 2, or (at your option) any
+Free Software Foundation; either version 3, or (at your option) any
later version.
-In addition to the permissions in the GNU General Public License, the
-Free Software Foundation gives you unlimited permission to link the
-compiled version of this file with other programs, and to distribute
-those programs without any restriction coming from the use of this
-file. (The General Public License restrictions do apply in other
-respects; for example, they cover modification of the file, and
-distribution when not linked into another program.)
-
This file is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
- As a special exception, if you link this library with files, some of
- which are compiled with GCC, this library does not by itself cause
- the resulting object or executable to be covered by the GNU General
- Public License.
- This exception does not however invalidate any other reasons why
- the executable file or object might be covered by the GNU General
- Public License. */
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
/* Note that we provide prototypes for all "const" functions, to attach
#include "config.h"
#if defined (__CRIS_arch_version) && __CRIS_arch_version >= 3
-#define LZ(v) __extension__ \
- ({ int tmp_; __asm__ ("lz %1,%0" : "=r" (tmp_) : "r" (v)); tmp_; })
+#define LZ(v) __builtin_clz (v)
#endif
};
/* This is the worker function for div and mod. It is inlined into the
- respective library function. */
+ respective library function. Parameter A must have bit 31 == 0. */
+
static __inline__ struct quot_rem
-do_31div (unsigned long a, unsigned long b) __attribute__ ((__const__));
+do_31div (unsigned long a, unsigned long b)
+ __attribute__ ((__const__, __always_inline__));
static __inline__ struct quot_rem
do_31div (unsigned long a, unsigned long b)
}
}
-/* Note that unsigned and signed division both build when L_divsi3, but
- the unsigned variant is then inlined, as with do_31div above. */
-#if defined (L_udivsi3) || defined (L_divsi3)
-#ifndef L_udivsi3
-static __inline__
-#endif
+#ifdef L_udivsi3
unsigned long
__Udiv (unsigned long a, unsigned long b) __attribute__ ((__const__));
-#ifndef L_udivsi3
-static __inline__
-#endif
unsigned long
__Udiv (unsigned long a, unsigned long b)
{
return do_31div (a, b).quot+extra;
}
-
+#endif /* L_udivsi3 */
#ifdef L_divsi3
long
long
__Div (long a, long b)
{
- long sign;
- long result;
-
- /* Do *not* call do_31div since abs (-2147483648) == 2147483648
- <=> abs (-0x80000000) == 0x80000000
- which is still 32 bits. */
+ long extra = 0;
+ long sign = (b < 0) ? -1 : 1;
+
+ /* We need to handle a == -2147483648 as expected and must while
+ doing that avoid producing a sequence like "abs (a) < 0" as GCC
+ may optimize out the test. That sequence may not be obvious as
+ we call inline functions. Testing for a being negative and
+ handling (presumably much rarer than positive) enables us to get
+ a bit of optimization for an (accumulated) reduction of the
+ penalty of the 0x80000000 special-case. */
+ if (a < 0)
+ {
+ sign = -sign;
- sign = a ^ b;
- result = __Udiv (__builtin_labs (a), __builtin_labs (b));
+ if ((a & 0x7fffffff) == 0)
+ {
+ /* We're at 0x80000000. Tread carefully. */
+ a -= b * sign;
+ extra = sign;
+ }
+ a = -a;
+ }
- return (sign < 0) ? -result : result;
+ /* We knowingly penalize pre-v10 models by multiplication with the
+ sign. */
+ return sign * do_31div (a, __builtin_labs (b)).quot + extra;
}
#endif /* L_divsi3 */
-#endif /* L_udivsi3 || L_divsi3 */
-/* Note that unsigned and signed modulus both build when L_modsi3, but
- then the unsigned variant is inlined, as with do_31div above. */
-#if defined (L_umodsi3) || defined (L_modsi3)
-#ifndef L_umodsi3
-static __inline__
-#endif
+#ifdef L_umodsi3
unsigned long
__Umod (unsigned long a, unsigned long b) __attribute__ ((__const__));
-#ifndef L_umodsi3
-static __inline__
-#endif
unsigned long
__Umod (unsigned long a, unsigned long b)
{
return do_31div (a, b).rem;
}
+#endif /* L_umodsi3 */
#ifdef L_modsi3
long
long
__Mod (long a, long b)
{
- long result;
-
- result = __Umod (__builtin_labs (a), __builtin_labs (b));
+ long sign = 1;
+
+ /* We need to handle a == -2147483648 as expected and must while
+ doing that avoid producing a sequence like "abs (a) < 0" as GCC
+ may optimize out the test. That sequence may not be obvious as
+ we call inline functions. Testing for a being negative and
+ handling (presumably much rarer than positive) enables us to get
+ a bit of optimization for an (accumulated) reduction of the
+ penalty of the 0x80000000 special-case. */
+ if (a < 0)
+ {
+ sign = -1;
+ if ((a & 0x7fffffff) == 0)
+ /* We're at 0x80000000. Tread carefully. */
+ a += __builtin_labs (b);
+ a = -a;
+ }
- return (a < 0) ? -result : result;
+ return sign * do_31div (a, __builtin_labs (b)).rem;
}
#endif /* L_modsi3 */
-#endif /* L_umodsi3 || L_modsi3 */
#endif /* L_udivsi3 || L_divsi3 || L_umodsi3 || L_modsi3 */
/*
projects / msp430-gcc.git / blobdiff