ObjFW  Check-in [0272a8686f]

Overview
Comment:Don't use the lahf instruction.
Some early AMD64 CPUs don't support it.
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SHA3-256: 0272a8686f7caa0b0653164cae6048adf81e16d92c5607aa797d08159bceb278
User & Date: js on 2010-12-05 21:32:28
Other Links: manifest | tags
Context
2010-12-06
13:24
Add -[description] to OFNumber. check-in: b965dad5f8 user: js tags: trunk
2010-12-05
21:32
Don't use the lahf instruction.
Some early AMD64 CPUs don't support it. check-in: 0272a8686f user: js tags: trunk
12:32
Make subclassing OFTCPSocket easier. check-in: efa6d95aad user: js tags: trunk
Changes
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Modified src/atomic.h from [9f0732f9a3] to [c57a56dcf7].

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	}

	return NO;
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	int r;

	__asm__ (
	    "xorl	%0, %0\n\t"
	    "lock\n\t"
	    "cmpxchg	%2, %3\n\t"
	    "lahf\n\t"
	    "jne	.1\n\t"
	    "andb	$64, %%ah\n\t"
	    "shrb	$6, %%ah\n\t"
	    "movzx	%%ah, %0\n\t"
	    : "=a"(r)
	    "incl	%0\n"
	    ".1:"
	    : "=&r"(r)
	    : "a"(o), "r"(n), "m"(*p)
	);

	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_bool_compare_and_swap(p, o, n);
#elif defined(OF_HAVE_OSATOMIC)
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	if (*p == o) {
		*p = n;
		return YES;
	}

	return NO;
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	uint32_t r;
	int r;

	__asm__ (
	    "xorl	%0, %0\n\t"
	    "lock\n\t"
	    "cmpxchg	%2, %3\n\t"
	    "lahf\n\t"
	    "jne	.1\n\t"
	    "andb	$64, %%ah\n\t"
	    "shrb	$6, %%ah\n\t"
	    "movzx	%%ah, %0\n\t"
	    : "=a"(r)
	    "incl	%0\n"
	    ".1:"
	    : "=&r"(r)
	    : "a"(o), "r"(n), "m"(*p)
	);

	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_bool_compare_and_swap(p, o, n);
#elif defined(OF_HAVE_OSATOMIC)
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	if (*p == o) {
		*p = n;
		return YES;
	}

	return NO;
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	uint32_t r;
	int r;

	__asm__ (
	    "xorl	%0, %0\n\t"
	    "lock\n\t"
	    "cmpxchg	%2, %3\n\t"
	    "lahf\n\t"
	    "jne	.1\n\t"
	    "andb	$64, %%ah\n\t"
	    "shrb	$6, %%ah\n\t"
	    "movzx	%%ah, %0\n\t"
	    : "=a"(r)
	    : "a"(o), "q"(n), "m"(*p)
	    "incl	%0\n"
	    ".1:"
	    : "=&r"(r)
	    : "a"(o), "r"(n), "m"(*p)
	);

	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_bool_compare_and_swap(p, o, n);
#elif defined(OF_HAVE_OSATOMIC)
	return OSAtomicCompareAndSwapPtrBarrier(o, n, p);
#endif
}

Fossil 2.23 [47362306a7] 2023-11-01 18:56:47
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