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atomicity.h (__exchange_and_add): Use TAS on __mcf5400__.

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* config/cpu/m68k/atomicity.h (__exchange_and_add): Use TAS on
	__mcf5400__. Don't rely on __mc68000__ to detect a bare 68000.
	Document SMP safeness of asm macros.

From-SVN: r72570
This commit is contained in:
Bernardo Innocenti 2003-10-16 21:47:45 +02:00 committed by Bernardo Innocenti
parent 1e8a52484b
commit 068c84e3b5
2 changed files with 16 additions and 7 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2003-10-16 Bernardo Innocenti <bernie@develer.com>
* config/cpu/m68k/atomicity.h (__exchange_and_add): Use TAS on
__mcf5400__. Don't rely on __mc68000__ to detect a bare 68000.
Document SMP safeness of asm macros.
2003-10-16 Paolo Carlini <pcarlini@suse.de>
* src/locale.cc (locale::locale(const char*)): Tweak

17
libstdc++-v3/config/cpu/m68k/atomicity.h
View File

@ -94,22 +94,25 @@ __exchange_and_add (volatile _Atomic_word *__mem, int __val)
{
_Atomic_word __result;
// bset with no immediate addressing
#if defined(__mcf5200__) || defined(__mcf5300__) || defined(__mcf5400__)
// bset with no immediate addressing (not SMP-safe)
#if defined(__mcf5200__) || defined(__mcf5300__)
__asm__ __volatile__("1: bset.b #7,%0@\n\tjbne 1b"
: /* no outputs */
: "a"(&__Atomicity_lock<0>::_S_atomicity_lock)
: "cc", "memory");
// bset with immediate addressing
#elif defined(__mc68000__)
__asm__ __volatile__("1: bset.b #7,%0\n\tjbne 1b"
// CPU32 and MCF5400 support test-and-set (SMP-safe).
#elif defined(__mcpu32__) || defined(__mcf5400__)
__asm__ __volatile__("1: tas %0\n\tjbne 1b"
: "+m"(__Atomicity_lock<0>::_S_atomicity_lock)
: /* none */
: "cc");
#else // 680x0, cpu32, 5400 support test-and-set.
__asm__ __volatile__("1: tas %0\n\tjbne 1b"
// Use bset with immediate addressing for 68000/68010 (not SMP-safe)
// NOTE: TAS is available on the 68000, but unsupported by some Amiga
// memory controllers.
#else
__asm__ __volatile__("1: bset.b #7,%0\n\tjbne 1b"
: "+m"(__Atomicity_lock<0>::_S_atomicity_lock)
: /* none */
: "cc");