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atomicity.h (__compare_and_swap): Remove unused function.

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2001-10-05  Phil Edwards  <pme@gcc.gnu.org>

	* config/cpu/alpha/bits/atomicity.h (__compare_and_swap):  Remove
	unused function.
	* config/cpu/arm/bits/atomicity.h:  Likewise.
	* config/cpu/generic/bits/atomicity.h:  Likewise.
	* config/cpu/i486/bits/atomicity.h:  Likewise.
	* config/cpu/ia64/bits/atomicity.h:  Likewise.
	* config/cpu/mips/bits/atomicity.h:  Likewise.
	* config/cpu/powerpc/bits/atomicity.h:  Likewise.
	* config/cpu/sparc/sparc32/bits/atomicity.h:  Likewise.
	* config/cpu/sparc/sparc64/bits/atomicity.h:  Likewise.

From-SVN: r46038
This commit is contained in:
Phil Edwards 2001-10-05 18:43:43 +00:00
parent 27d95cbe50
commit 744ee8b72b
10 changed files with 13 additions and 210 deletions
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13
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,16 @@
2001-10-05 Phil Edwards <pme@gcc.gnu.org>
* config/cpu/alpha/bits/atomicity.h (__compare_and_swap): Remove
unused function.
* config/cpu/arm/bits/atomicity.h: Likewise.
* config/cpu/generic/bits/atomicity.h: Likewise.
* config/cpu/i486/bits/atomicity.h: Likewise.
* config/cpu/ia64/bits/atomicity.h: Likewise.
* config/cpu/mips/bits/atomicity.h: Likewise.
* config/cpu/powerpc/bits/atomicity.h: Likewise.
* config/cpu/sparc/sparc32/bits/atomicity.h: Likewise.
* config/cpu/sparc/sparc64/bits/atomicity.h: Likewise.
2001-10-04 Phil Edwards <pme@gcc.gnu.org>
* docs/html/faq/index.html: Describe DR #22, and a workaround.

21
libstdc++-v3/config/cpu/alpha/bits/atomicity.h
View File

@ -73,25 +73,4 @@ __atomic_add (volatile _Atomic_word* __mem, int __val)
: "m" (*__mem), "r"(__val));
}
static inline int
__attribute__ ((__unused__))
__compare_and_swap (volatile long *__p, long __oldval, long __newval)
{
int __ret;
__asm__ __volatile__ (
"\n$Lcas_%=:\n\t"
"ldq_l %0,%4\n\t"
"cmpeq %0,%2,%0\n\t"
"beq %0,3f\n\t"
"mov %3,%0\n\t"
"stq_c %0,%1\n\t"
"beq %0,$Lcas_%=\n\t"
"mb"
: "=&r"(__ret), "=m"(*__p)
: "r"(__oldval), "r"(__newval), "m"(*__p));
return __ret;
}
#endif /* atomicity.h */

57
libstdc++-v3/config/cpu/arm/bits/atomicity.h
View File

@ -127,63 +127,6 @@ __atomic_add (volatile _Atomic_word *__mem, int __val)
#endif
}
static inline int
__attribute__ ((__unused__))
__compare_and_swap (volatile long *__p, long __oldval, long __newval)
{
int __result;
long __tmp;
#ifdef __thumb__
/* Since this function is inlined, we can't be sure of the alignment. */
__asm__ __volatile__ (
"ldr %0, 4f \n\t"
"bx %0 \n\t"
".align 0 \n"
"4:\t"
".word 0f \n\t"
".code 32 \n"
"0:\t"
"ldr %1, [%2] \n\t"
"mov %0, #0 \n\t"
"cmp %1, %4 \n\t"
"bne 1f \n\t"
"swp %0, %3, [%2] \n\t"
"cmp %1, %0 \n\t"
"swpne %1, %0, [%2] \n\t"
"bne 0b \n\t"
"mov %0, #1 \n"
"1:\t"
"ldr %1, 2f \n\t"
"bx %1 \n"
"2:\t"
".word 3f \n\t"
".code 16\n"
"3:\n"
: "=&l"(__result), "=&r"(__tmp)
: "r" (__p), "r" (__newval), "r" (__oldval)
: "cc", "memory");
#else
__asm__ __volatile__ (
"\n"
"0:\t"
"ldr %1, [%2] \n\t"
"mov %0, #0 \n\t"
"cmp %1, %4 \n\t"
"bne 1f \n\t"
"swp %0, %3, [%2] \n\t"
"cmp %1, %0 \n\t"
"swpne %1, %0, [%2] \n\t"
"bne 0b \n\t"
"mov %0, #1 \n"
"1:\n\t"
""
: "=&r"(__result), "=&r"(__tmp)
: "r" (__p), "r" (__newval), "r" (__oldval)
: "cc", "memory");
#endif
return __result;
}
static inline long
__attribute__ ((__unused__))
__always_swap (volatile long *__p, long __newval)

11
libstdc++-v3/config/cpu/generic/bits/atomicity.h
View File

@ -48,15 +48,4 @@ __atomic_add (_Atomic_word* __mem, int __val)
*__mem += __val;
}
static inline int
__attribute__ ((__unused__))
__compare_and_swap (long *__p, long __oldval, long __newval)
{
if (*__p != __oldval)
return 0;
*__p = __newval;
return 1;
}
#endif /* atomicity.h */

13
libstdc++-v3/config/cpu/i486/bits/atomicity.h
View File

@ -52,19 +52,6 @@ __atomic_add (volatile _Atomic_word* __mem, int __val)
: : "ir" (__val), "m" (*__mem) : "memory");
}
static inline char
__attribute__ ((__unused__))
__compare_and_swap (volatile long* __p, long __oldval, long __newval)
{
char __ret;
long __readval;
__asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
: "=q" (__ret), "=m" (*__p), "=a" (__readval)
: "r" (__newval), "m" (*__p), "a" (__oldval));
return __ret;
}
#endif /* atomicity.h */

7
libstdc++-v3/config/cpu/ia64/bits/atomicity.h
View File

@ -48,11 +48,4 @@ __atomic_add (volatile _Atomic_word* __mem, int __val)
__sync_fetch_and_add (__mem, __val);
}
static inline int
__attribute__ ((__unused__))
__compare_and_swap (volatile long *__p, long __oldval, long __newval)
{
return __sync_bool_compare_and_swap (__p, __oldval, __newval);
}
#endif /* atomicity.h */

27
libstdc++-v3/config/cpu/mips/bits/atomicity.h
View File

@ -75,31 +75,4 @@ __atomic_add (volatile _Atomic_word *__mem, int __val)
: "memory");
}
static inline int
__attribute__ ((unused))
__compare_and_swap (volatile long int *__p, long int __oldval,
long int __newval)
{
long int __ret;
__asm__ __volatile__
("/* Inline compare & swap */\n\t"
"1:\n\t"
"ll %0,%4\n\t"
".set push\n"
".set noreorder\n\t"
"bne %0,%2,2f\n\t"
"move %0,%3\n\t"
".set pop\n\t"
"sc %0,%1\n\t"
"beqz %0,1b\n"
"2:\n\t"
"/* End compare & swap */"
: "=&r" (__ret), "=m" (*__p)
: "r" (__oldval), "r" (__newval), "m" (*__p)
: "memory");
return __ret;
}
#endif /* atomicity.h */

22
libstdc++-v3/config/cpu/powerpc/bits/atomicity.h
View File

@ -69,28 +69,6 @@ __atomic_add (volatile _Atomic_word *__mem, int __val)
: "cr0", "memory");
}
static inline int
__attribute__ ((__unused__))
__compare_and_swap (volatile long *__p, long int __oldval, long int __newval)
{
int __res;
__asm__ __volatile__ (
"/* Inline compare & swap */\n"
"0:\t"
"lwarx %0,0,%1 \n\t"
"sub%I2c. %0,%0,%2 \n\t"
"cntlzw %0,%0 \n\t"
"bne- 1f \n\t"
"stwcx. %3,0,%1 \n\t"
"bne- 0b \n"
"1:\n\t"
"/* End compare & swap */"
: "=&b"(__res)
: "r"(__p), "Ir"(__oldval), "r"(__newval)
: "cr0", "memory");
return __res >> 5;
}
static inline long
__attribute__ ((__unused__))
__always_swap (volatile long *__p, long int __newval)

29
libstdc++-v3/config/cpu/sparc/sparc32/bits/atomicity.h
View File

@ -76,33 +76,4 @@ __atomic_add (volatile _Atomic_word* __mem, int __val)
: "memory");
}
static int
__attribute__ ((__unused__))
__compare_and_swap (volatile long *__p, long __oldval, long __newval)
{
static unsigned char __lock;
long __ret, __tmp;
__asm__ __volatile__("1: ldstub [%1], %0\n\t"
" cmp %0, 0\n\t"
" bne 1b\n\t"
" nop"
: "=&r" (__tmp)
: "r" (&__lock)
: "memory");
if (*__p != __oldval)
__ret = 0;
else
{
*__p = __newval;
__ret = 1;
}
__asm__ __volatile__("stb %%g0, [%0]"
: /* no outputs */
: "r" (&__lock)
: "memory");
return __ret;
}
#endif /* atomicity.h */

23
libstdc++-v3/config/cpu/sparc/sparc64/bits/atomicity.h
View File

@ -67,27 +67,4 @@ __atomic_add (volatile _Atomic_word* __mem, int __val)
: "memory");
}
static inline int
__attribute__ ((__unused__))
__compare_and_swap (volatile long *__p, long __oldval, long __newval)
{
register int __tmp;
register long __tmp2;
__asm__ __volatile__("1: ldx [%4], %0\n\t"
" mov %2, %1\n\t"
" cmp %0, %3\n\t"
" bne,a,pn %%xcc, 2f\n\t"
" mov 0, %0\n\t"
" casx [%4], %0, %1\n\t"
" sub %0, %1, %0\n\t"
" brnz,pn %0, 1b\n\t"
" mov 1, %0\n\t"
"2:"
: "=&r" (__tmp), "=&r" (__tmp2)
: "r" (__newval), "r" (__oldval), "r" (__p)
: "memory");
return __tmp;
}
#endif /* atomicity.h */