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Update.
2003-03-20 Ulrich Drepper <drepper@redhat.com> * include/atomic.h: Define atomic_exchange and atomic_decrement_if_positive if not already defined. Add some __builtin_expect. * sysdeps/i386/i486/bits/atomic.h: Define atomic_exchange. * sysdeps/x86_64/bits/atomic.h: Likewise. * sysdeps/ia64/bits/atomic.h: Pretty printing. Define atomic_exchange. * sysdeps/powerpc/bits/atomic.h: Pretty printing. Define atomic_exchange, atomic_exchange_and_add, and atomic_decrement_if_positive
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Ulrich Drepper
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ChangeLog
12
ChangeLog
@ -1,3 +1,15 @@
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2003-03-20 Ulrich Drepper <drepper@redhat.com>
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* include/atomic.h: Define atomic_exchange and
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atomic_decrement_if_positive if not already defined. Add some
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__builtin_expect.
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* sysdeps/i386/i486/bits/atomic.h: Define atomic_exchange.
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* sysdeps/x86_64/bits/atomic.h: Likewise.
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* sysdeps/ia64/bits/atomic.h: Pretty printing. Define atomic_exchange.
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* sysdeps/powerpc/bits/atomic.h: Pretty printing. Define
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atomic_exchange, atomic_exchange_and_add, and
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atomic_decrement_if_positive
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2003-03-20 Alexandre Oliva <aoliva@redhat.com>
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* sysdeps/unix/sysv/linux/mips/mips64/n64/ioctl.S: Sign-extend
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@ -119,6 +119,29 @@ typedef uintmax_t uatomic_max_t;
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#endif
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/* Note that we need no lock prefix. */
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#define atomic_exchange(mem, newvalue) \
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({ __typeof (*mem) result; \
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if (sizeof (*mem) == 1) \
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__asm __volatile ("xchgb %b0, %1" \
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: "=r" (result), "=m" (*mem) \
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: "0" (newvalue), "1" (*mem)); \
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else if (sizeof (*mem) == 2) \
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__asm __volatile ("xchgw %w0, %1" \
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: "=r" (result), "=m" (*mem) \
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: "0" (newvalue), "1" (*mem)); \
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else if (sizeof (*mem) == 4) \
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__asm __volatile ("xchgl %0, %1" \
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: "=r" (result), "=m" (*mem) \
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: "0" (newvalue), "1" (*mem)); \
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else \
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{ \
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result = 0; \
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abort (); \
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} \
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result; })
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#define atomic_exchange_and_add(mem, value) \
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({ __typeof (*mem) result; \
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__typeof (value) addval = (value); \
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@ -55,7 +55,7 @@ typedef uintmax_t uatomic_max_t;
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(!__sync_bool_compare_and_swap_si ((int *) (mem), (int) (long) (oldval), \
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(int) (long) (newval)))
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# define __arch_compare_and_exchange_64_acq(mem, newval, oldval) \
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#define __arch_compare_and_exchange_64_acq(mem, newval, oldval) \
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(!__sync_bool_compare_and_swap_di ((long *) (mem), (long) (oldval), \
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(long) (newval)))
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@ -63,11 +63,15 @@ typedef uintmax_t uatomic_max_t;
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__sync_val_compare_and_swap_si ((int *) (mem), (int) (long) (oldval), \
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(int) (long) (newval))
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# define __arch_compare_and_exchange_64_val_acq(mem, newval, oldval) \
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#define __arch_compare_and_exchange_64_val_acq(mem, newval, oldval) \
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__sync_val_compare_and_swap_di ((long *) (mem), (long) (oldval), \
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(long) (newval))
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# define atomic_exchange_and_add(mem, value) \
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/* Atomically store newval and return the old value. */
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#define atomic_exchange(mem, value) \
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__sync_lock_test_and_set_si (mem, value)
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#define atomic_exchange_and_add(mem, value) \
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({ \
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__typeof (*mem) __oldval, __val; \
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__typeof (mem) __memp = (mem); \
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@ -53,11 +53,11 @@ typedef uintmax_t uatomic_max_t;
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(abort (), 0)
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#ifdef UP
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#define __ARCH_ACQ_INSTR ""
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#define __ARCH_REL_INSTR ""
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# define __ARCH_ACQ_INSTR ""
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# define __ARCH_REL_INSTR ""
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#else
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#define __ARCH_ACQ_INSTR "isync"
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#define __ARCH_REL_INSTR "sync"
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# define __ARCH_ACQ_INSTR "isync"
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# define __ARCH_REL_INSTR "sync"
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#endif
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/*
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@ -86,7 +86,7 @@ typedef uintmax_t uatomic_max_t;
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})
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#ifdef __powerpc64__
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#define __arch_compare_and_exchange_64_acq(mem, newval, oldval) \
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# define __arch_compare_and_exchange_64_acq(mem, newval, oldval)\
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({ \
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unsigned long __tmp; \
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__asm __volatile (__ARCH_REL_INSTR "\n" \
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@ -103,14 +103,64 @@ typedef uintmax_t uatomic_max_t;
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})
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#else /* powerpc32 */
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#define __arch_compare_and_exchange_64_acq(mem, newval, oldval) \
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# define __arch_compare_and_exchange_64_acq(mem, newval, oldval) \
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(abort (), 0)
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#endif
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#define atomic_exchange(mem, value) \
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({ if (sizeof (*mem) != 4) \
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abort (); \
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int __val, __tmp; \
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__asm __volatile (__ARCH_REL_INSTR "\n" \
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"1: lwarx %0,0,%2\n" \
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" stwcx. %3,0,%2\n" \
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" bne- 1b" \
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: "=&r" (__val), "=m" (*mem) \
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: "r" (mem), "r" (value), "1" (*mem) \
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: "cr0", "memory"); \
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__val; })
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#define atomic_exchange_and_add(mem, value) \
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({ if (sizeof (*mem) != 4) \
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abort (); \
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int __val, __tmp; \
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__asm __volatile ("1: lwarx %0,0,%3\n" \
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" addi %1,%0,%4\n" \
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" stwcx. %1,0,%3\n" \
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" bne- 1b" \
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: "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \
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: "r" (mem), "I" (value), "2" (*mem) \
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: "cr0"); \
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__val; \
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})
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/* Decrement *MEM if it is > 0, and return the old value. */
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#define atomic_decrement_if_positive(mem) \
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({ if (sizeof (*mem) != 4) \
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abort (); \
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int __val, __tmp; \
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__asm __volatile ("1: lwarx %0,0,%3\n" \
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" cmpwi 0,%0,0\n" \
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" addi %1,%0,-1\n" \
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" ble 2f\n" \
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" stwcx. %1,0,%3\n" \
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" bne- 1b\n" \
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"2: " __ARCH_ACQ_INSTR \
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: "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \
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: "r" (mem), "2" (*mem) \
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: "cr0"); \
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__val; \
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})
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#define atomic_full_barrier() __asm ("sync" ::: "memory")
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#ifdef __powerpc64__
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#define atomic_read_barrier() __asm ("lwsync" ::: "memory")
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# define atomic_read_barrier() __asm ("lwsync" ::: "memory")
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#else
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#define atomic_read_barrier() __asm ("sync" ::: "memory")
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# define atomic_read_barrier() __asm ("sync" ::: "memory")
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#endif
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#define atomic_write_barrier() __asm ("eieio" ::: "memory")
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@ -1,4 +1,4 @@
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/* Copyright (C) 2002 Free Software Foundation, Inc.
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/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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@ -84,6 +84,28 @@ typedef uintmax_t uatomic_max_t;
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ret; })
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/* Note that we need no lock prefix. */
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#define atomic_exchange(mem, newvalue) \
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({ __typeof (*mem) result; \
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if (sizeof (*mem) == 1) \
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__asm __volatile ("xchgb %b0, %1" \
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: "=r" (result), "=m" (*mem) \
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: "0" (newvalue), "1" (*mem)); \
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else if (sizeof (*mem) == 2) \
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__asm __volatile ("xchgw %w0, %1" \
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: "=r" (result), "=m" (*mem) \
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: "0" (newvalue), "1" (*mem)); \
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else if (sizeof (*mem) == 4) \
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__asm __volatile ("xchgl %0, %1" \
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: "=r" (result), "=m" (*mem) \
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: "0" (newvalue), "1" (*mem)); \
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else \
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__asm __volatile ("xchgq %q0, %1" \
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: "=r" (result), "=m" (*mem) \
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: "0" (newvalue), "1" (*mem)); \
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result; })
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#define atomic_exchange_and_add(mem, value) \
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({ __typeof (*mem) result; \
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if (sizeof (*mem) == 1) \
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