diff options
Diffstat (limited to 'contrib/libstdc++/std/bastring.h')
| -rw-r--r-- | contrib/libstdc++/std/bastring.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/contrib/libstdc++/std/bastring.h b/contrib/libstdc++/std/bastring.h index f188628..7089126 100644 --- a/contrib/libstdc++/std/bastring.h +++ b/contrib/libstdc++/std/bastring.h @@ -73,7 +73,41 @@ private: charT* data () { return reinterpret_cast<charT *>(this + 1); } charT& operator[] (size_t s) { return data () [s]; } charT* grab () { if (selfish) return clone (); ++ref; return data (); } +#if defined __i486__ || defined __i586__ || defined __i686__ + void release () + { + size_t __val; + // This opcode exists as a .byte instead of as a mnemonic for the + // benefit of SCO OpenServer 5. The system assembler (which is + // essentially required on this target) can't assemble xaddl in + //COFF mode. + asm (".byte 0xf0, 0x0f, 0xc1, 0x02" // lock; xaddl %eax, (%edx) + : "=a" (__val) + : "0" (-1), "m" (ref), "d" (&ref) + : "memory"); + + if (__val == 1) + delete this; + } +#elif defined __sparcv9__ + void release () + { + size_t __newval, __oldval = ref; + do + { + __newval = __oldval - 1; + __asm__ ("cas [%4], %2, %0" + : "=r" (__oldval), "=m" (ref) + : "r" (__oldval), "m" (ref), "r"(&(ref)), "0" (__newval)); + } + while (__newval != __oldval); + + if (__oldval == 0) + delete this; + } +#else void release () { if (--ref == 0) delete this; } +#endif inline static void * operator new (size_t, size_t); inline static void operator delete (void *); |
