ObjFW  Check-in [bd2eef5fe1]

Overview
Comment:Assembly implementation for atomic operations (x86 and AMD64).
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SHA3-256: bd2eef5fe165d729bfbbc117edfdf559b839d99c67678121ef15b37a1701626c
User & Date: js on 2010-08-25 21:35:11
Other Links: manifest | tags
Context
2010-08-25
22:05
Better way to cache OFAutoreleasePool.
This way, the tests work again with static linking. check-in: f2f4062b53 user: js tags: trunk
21:35
Assembly implementation for atomic operations (x86 and AMD64). check-in: bd2eef5fe1 user: js tags: trunk
11:33
-[setObject:forKey:] and -[removeObjectForKey:] now return void. check-in: eea73f8d37 user: js tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Modified configure.ac from [bb9d2ee4c5] to [7b44bd66cf].

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	AC_CHECK_FUNC(objc_sync_enter,, [
		AC_SUBST(OBJC_SYNC_M, "objc_sync.m")
		AC_DEFINE(NEED_OBJC_SYNC_INIT, 1,
			[Whether objc_sync_init needs to be called])])

	atomic_ops="none"

	AC_MSG_CHECKING(whether __sync_* works)
	AC_TRY_LINK([#include <stdint.h>], [
		int32_t i, j;
		if (__sync_add_and_fetch(&i, 1))
			j = __sync_sub_and_fetch(&i, 1);
		while (!__sync_bool_compare_and_swap(&i, 0, 1));
		], [
		AC_MSG_RESULT(yes)
		atomic_ops="gcc builtins"
		AC_DEFINE(OF_HAVE_GCC_ATOMIC_OPS, 1,
			[Whether gcc atomic operations are available])
		], [
		old_OBJCFLAGS="$OBJCFLAGS"
		OBJCFLAGS="$OBJCFLAGS -march=i486"


		AC_TRY_LINK([#include <stdint.h>], [
			int32_t i, j;
			if (__sync_add_and_fetch(&i, 1))
				j = __sync_sub_and_fetch(&i, 1);
			while (!__sync_bool_compare_and_swap(&i, 0, 1));
			], [
			AC_MSG_RESULT([yes, with -march=i486])
			atomic_ops="gcc builtins (with -march=i486)"
			AC_DEFINE(OF_HAVE_GCC_ATOMIC_OPS, 1,
				[Whether gcc atomic operations are available])
			AC_SUBST(ATOMIC_OBJCFLAGS, "-march=i486")
			], [
			AC_MSG_RESULT(no)
			OBJCFLAGS="$old_OBJCFLAGS"])])


	if test x"$atomic_ops" = x"none"; then
		AC_CHECK_HEADER(libkern/OSAtomic.h, [
			atomic_ops="libkern/OSAtomic.h"
			AC_DEFINE(OF_HAVE_LIBKERN_OSATOMIC_H, 1,
				[Whether we have libkern/OSAtomic.h])])
	fi








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	AC_CHECK_FUNC(objc_sync_enter,, [
		AC_SUBST(OBJC_SYNC_M, "objc_sync.m")
		AC_DEFINE(NEED_OBJC_SYNC_INIT, 1,
			[Whether objc_sync_init needs to be called])])

	atomic_ops="none"

	AC_MSG_CHECKING(whether we have an atomic ops assembly implementation)
	AC_EGREP_CPP(yes, [
		#if defined(__GNUC__) && (defined(__i386__) || \
		    defined(__amd64__) || defined(__x86_64__))
		yes
		#endif
		], [
		AC_MSG_RESULT(yes)
		atomic_ops="assembly implementation"


		], [AC_MSG_RESULT(no)])


	if test x"$atomic_ops" = x"none"; then
		AC_MSG_CHECKING(whether __sync_* works)
		AC_TRY_LINK([#include <stdint.h>], [
			int32_t i, j;
			if (__sync_add_and_fetch(&i, 1))
				j = __sync_sub_and_fetch(&i, 1);
			while (!__sync_bool_compare_and_swap(&i, 0, 1));
			], [
			AC_MSG_RESULT(yes)
			atomic_ops="gcc builtins"
			AC_DEFINE(OF_HAVE_GCC_ATOMIC_OPS, 1,
				[Whether gcc atomic operations are available])


			], [AC_MSG_RESULT(no)])

	fi

	if test x"$atomic_ops" = x"none"; then
		AC_CHECK_HEADER(libkern/OSAtomic.h, [
			atomic_ops="libkern/OSAtomic.h"
			AC_DEFINE(OF_HAVE_LIBKERN_OSATOMIC_H, 1,
				[Whether we have libkern/OSAtomic.h])])
	fi
︙︙

Modified src/atomic.h from [dece28bae9] to [527e2eb067]. 

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/*
 * Copyright (c) 2008 - 2010
 *   Jonathan Schleifer <js@webkeks.org>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE included in
 * the packaging of this file.
 */

#import "macros.h"

#if defined(OF_THREADS) && !defined(OF_HAVE_GCC_ATOMIC_OPS) && \
    !defined(OF_HAVE_LIBKERN_OSATOMIC_H)
# error No atomic operations available!
#endif

#ifdef OF_HAVE_LIBKERN_OSATOMIC_H
# include <libkern/OSAtomic.h>
#endif

static OF_INLINE int32_t
of_atomic_add_32(volatile int32_t *p, int32_t i)
{
#if !defined(OF_THREADS)
	return (*p += i);









#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_add_and_fetch(p, i);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicAdd32Barrier(i, p);
#endif
}

static OF_INLINE int32_t
of_atomic_sub_32(volatile int32_t *p, int32_t i)
{
#if !defined(OF_THREADS)
	return (*p -= i);









#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_sub_and_fetch(p, i);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicAdd32Barrier(-i, p);
#endif
}

static OF_INLINE int32_t
of_atomic_inc_32(volatile int32_t *p)
{
#if !defined(OF_THREADS)
	return ++*p;









#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_add_and_fetch(p, 1);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicIncrement32Barrier(p);
#endif
}

static OF_INLINE int32_t
of_atomic_dec_32(volatile int32_t *p)
{
#if !defined(OF_THREADS)
	return --*p;









#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_sub_and_fetch(p, 1);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicDecrement32Barrier(p);
#endif
}

static OF_INLINE uint32_t
of_atomic_or_32(volatile uint32_t *p, uint32_t i)
{
#if !defined(OF_THREADS)
	return (*p |= i);









#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_or_and_fetch(p, i);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicOr32Barrier(i, p);
#endif
}

static OF_INLINE uint32_t
of_atomic_and_32(volatile uint32_t *p, uint32_t i)
{
#if !defined(OF_THREADS)
	return (*p &= i);









#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_and_and_fetch(p, i);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicAnd32Barrier(i, p);
#endif
}

static OF_INLINE uint32_t
of_atomic_xor_32(volatile uint32_t *p, uint32_t i)
{
#if !defined(OF_THREADS)
	return (*p ^= i);









#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_xor_and_fetch(p, i);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicXor32Barrier(i, p);
#endif
}

static OF_INLINE BOOL
of_atomic_cmpswap_32(volatile int32_t *p, int32_t o, int32_t n)
{
#if !defined(OF_THREADS)
	if (*p == o) {
		*p = n;
		return YES;
	}

	return NO;












#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_bool_compare_and_swap(p, o, n);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicCompareAndSwap32Barrier(o, n, p);
#endif
}

static OF_INLINE BOOL
of_atomic_cmpswap_ptr(void* volatile *p, void *o, void *n)
{
#if !defined(OF_THREADS)
	if (*p == o) {
		*p = n;
		return YES;
	}

	return NO;












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














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/*
 * Copyright (c) 2008 - 2010
 *   Jonathan Schleifer <js@webkeks.org>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE included in
 * the packaging of this file.
 */

#import "macros.h"

#if defined(OF_THREADS) && !defined(OF_X86_ASM) && !defined(OF_AMD64_ASM) && \
    !defined(OF_HAVE_GCC_ATOMIC_OPS) && !defined(OF_HAVE_LIBKERN_OSATOMIC_H)
# error No atomic operations available!
#endif

#ifdef OF_HAVE_LIBKERN_OSATOMIC_H
# include <libkern/OSAtomic.h>
#endif

static OF_INLINE int32_t
of_atomic_add_32(volatile int32_t *p, int32_t i)
{
#if !defined(OF_THREADS)
	return (*p += i);
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	int32_t r = *p + i;
	__asm__ volatile (
	    "lock\n\t"
	    "addl %0, (%1)"
	    :
	    : "r"(i), "r"(p), "m"(*p)
	);
	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_add_and_fetch(p, i);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicAdd32Barrier(i, p);
#endif
}

static OF_INLINE int32_t
of_atomic_sub_32(volatile int32_t *p, int32_t i)
{
#if !defined(OF_THREADS)
	return (*p -= i);
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	int32_t r = *p - i;
	__asm__ volatile (
	    "lock\n\t"
	    "subl %0, (%1)"
	    :
	    : "r"(i), "r"(p), "m"(*p)
	);
	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_sub_and_fetch(p, i);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicAdd32Barrier(-i, p);
#endif
}

static OF_INLINE int32_t
of_atomic_inc_32(volatile int32_t *p)
{
#if !defined(OF_THREADS)
	return ++*p;
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	int32_t r = *p + 1;
	__asm__ volatile (
	    "lock\n\t"
	    "incl (%0)"
	    :
	    : "r"(p), "m"(*p)
	);
	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_add_and_fetch(p, 1);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicIncrement32Barrier(p);
#endif
}

static OF_INLINE int32_t
of_atomic_dec_32(volatile int32_t *p)
{
#if !defined(OF_THREADS)
	return --*p;
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	int32_t r = *p - 1;
	__asm__ volatile (
	    "lock\n\t"
	    "decl (%0)"
	    :
	    : "r"(p), "m"(*p)
	);
	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_sub_and_fetch(p, 1);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicDecrement32Barrier(p);
#endif
}

static OF_INLINE uint32_t
of_atomic_or_32(volatile uint32_t *p, uint32_t i)
{
#if !defined(OF_THREADS)
	return (*p |= i);
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	uint32_t r = *p | i;
	__asm__ volatile (
	    "lock\n\t"
	    "orl %0, (%1)"
	    :
	    : "r"(i), "r"(p), "m"(*p)
	);
	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_or_and_fetch(p, i);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicOr32Barrier(i, p);
#endif
}

static OF_INLINE uint32_t
of_atomic_and_32(volatile uint32_t *p, uint32_t i)
{
#if !defined(OF_THREADS)
	return (*p &= i);
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	uint32_t r = *p & i;
	__asm__ volatile (
	    "lock\n\t"
	    "andl %0, (%1)"
	    :
	    : "r"(i), "r"(p), "m"(*p)
	);
	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_and_and_fetch(p, i);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicAnd32Barrier(i, p);
#endif
}

static OF_INLINE uint32_t
of_atomic_xor_32(volatile uint32_t *p, uint32_t i)
{
#if !defined(OF_THREADS)
	return (*p ^= i);
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	uint32_t r = *p ^ i;
	__asm__ volatile (
	    "lock\n\t"
	    "xorl %0, (%1)"
	    :
	    : "r"(i), "r"(p), "m"(*p)
	);
	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_xor_and_fetch(p, i);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicXor32Barrier(i, p);
#endif
}

static OF_INLINE BOOL
of_atomic_cmpswap_32(volatile int32_t *p, int32_t o, int32_t n)
{
#if !defined(OF_THREADS)
	if (*p == o) {
		*p = n;
		return YES;
	}

	return NO;
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	uint32_t r;
	__asm__ volatile (
	    "lock; cmpxchg %2, (%3)\n\t"
	    "lahf\n\t"
	    "andb	$64, %%ah\n\t"
	    "shrb	$6, %%ah\n\t"
	    "movzx	%%ah, %0\n\t"
	    : "=a"(r)
	    : "a"(o), "r"(n), "r"(p), "m"(*p)
	);
	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_bool_compare_and_swap(p, o, n);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicCompareAndSwap32Barrier(o, n, p);
#endif
}

static OF_INLINE BOOL
of_atomic_cmpswap_ptr(void* volatile *p, void *o, void *n)
{
#if !defined(OF_THREADS)
	if (*p == o) {
		*p = n;
		return YES;
	}

	return NO;
#elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	uint32_t r;
	__asm__ volatile (
	    "lock; cmpxchg %2, (%3)\n\t"
	    "lahf\n\t"
	    "andb	$64, %%ah\n\t"
	    "shrb	$6, %%ah\n\t"
	    "movzx	%%ah, %0\n\t"
	    : "=a"(r)
	    : "a"(o), "q"(n), "q"(p), "m"(*p)
	);
	return r;
#elif defined(OF_HAVE_GCC_ATOMIC_OPS)
	return __sync_bool_compare_and_swap(p, o, n);
#elif defined(OF_HAVE_LIBKERN_OSATOMIC_H)
	return OSAtomicCompareAndSwapPtrBarrier(o, n, p);
#endif
}

Modified src/macros.h from [4ed7c72a5b] to [d5b97d5660].

︙︙
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	    (i & UINT64_C(0x00000000000000FF)) << 56;
}

static OF_INLINE uint16_t
OF_BSWAP16_NONCONST(uint16_t i)
{
#if defined(OF_X86_ASM) || defined(OF_AMD64_ASM)

	__asm__ ("xchgb	%h0, %b0" : "=Q"(i) : "0"(i));



#elif defined(OF_PPC_ASM)

	__asm__ ("lhbrx	%0, 0, %1" : "=r"(i) : "r"(&i), "m"(i));



#elif defined(OF_ARM_ASM)
	__asm__ ("rev16	%0, %0" : "=r"(i) : "0"(i));




#else
	i = (i & UINT16_C(0xFF00)) >> 8 |
	    (i & UINT16_C(0x00FF)) << 8;
#endif
	return i;
}

static OF_INLINE uint32_t
OF_BSWAP32_NONCONST(uint32_t i)
{
#if defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	__asm__ ("bswap	%0" : "=q"(i) : "0"(i));




#elif defined(OF_PPC_ASM)

	__asm__ ("lwbrx	%0, 0, %1" : "=r"(i) : "r"(&i), "m"(i));



#elif defined(OF_ARM_ASM)
	__asm__ ("rev	%0, %0" : "=r"(i) : "0"(i));




#else
	i = (i & UINT32_C(0xFF000000)) >> 24 |
	    (i & UINT32_C(0x00FF0000)) >>  8 |
	    (i & UINT32_C(0x0000FF00)) <<  8 |
	    (i & UINT32_C(0x000000FF)) << 24;
#endif
	return i;
}

static OF_INLINE uint64_t
OF_BSWAP64_NONCONST(uint64_t i)
{
#if defined(OF_AMD64_ASM)
	__asm__ ("bswap	%0" : "=r"(i) : "0"(i));




#elif defined(OF_X86_ASM)

	__asm__ ("bswap	%%eax\n\t"
		 "bswap	%%edx\n\t"
		 "xchgl	%%eax, %%edx" : "=A"(i) : "0"(i));



#else
	i = (uint64_t)OF_BSWAP32_NONCONST(i & 0xFFFFFFFF) << 32 |
	    OF_BSWAP32_NONCONST(i >> 32);
#endif
	return i;
}









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	    (i & UINT64_C(0x00000000000000FF)) << 56;
}

static OF_INLINE uint16_t
OF_BSWAP16_NONCONST(uint16_t i)
{
#if defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	__asm__ (
	    "xchgb	%h0, %b0"
	    : "=Q"(i)
	    : "0"(i)
	);
#elif defined(OF_PPC_ASM)
	__asm__ (
	    "lhbrx	%0, 0, %1"
	    : "=r"(i)
	    : "r"(&i), "m"(i)
	);
#elif defined(OF_ARM_ASM)
	__asm__ (
	    "rev16	%0, %0"
	    : "=r"(i)
	    : "0"(i)
	);
#else
	i = (i & UINT16_C(0xFF00)) >> 8 |
	    (i & UINT16_C(0x00FF)) << 8;
#endif
	return i;
}

static OF_INLINE uint32_t
OF_BSWAP32_NONCONST(uint32_t i)
{
#if defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	__asm__ (
	    "bswap	%0"
	    : "=q"(i)
	    : "0"(i)
	);
#elif defined(OF_PPC_ASM)
	__asm__ (
	    "lwbrx	%0, 0, %1"
	    : "=r"(i)
	    : "r"(&i), "m"(i)
	);
#elif defined(OF_ARM_ASM)
	__asm__ (
	    "rev	%0, %0"
	    : "=r"(i)
	    : "0"(i)
	);
#else
	i = (i & UINT32_C(0xFF000000)) >> 24 |
	    (i & UINT32_C(0x00FF0000)) >>  8 |
	    (i & UINT32_C(0x0000FF00)) <<  8 |
	    (i & UINT32_C(0x000000FF)) << 24;
#endif
	return i;
}

static OF_INLINE uint64_t
OF_BSWAP64_NONCONST(uint64_t i)
{
#if defined(OF_AMD64_ASM)
	__asm__ (
	    "bswap	%0"
	    : "=r"(i)
	    : "0"(i)
	);
#elif defined(OF_X86_ASM)
	__asm__ (
	    "bswap	%%eax\n\t"
	    "bswap	%%edx\n\t"
	    "xchgl	%%eax, %%edx"
	    : "=A"(i)
	    : "0"(i)
	);
#else
	i = (uint64_t)OF_BSWAP32_NONCONST(i & 0xFFFFFFFF) << 32 |
	    OF_BSWAP32_NONCONST(i >> 32);
#endif
	return i;
}
︙︙

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