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Side by Side Diff: src/base/atomicops_internals_mips_gcc.h

Issue 857303003: Version 3.30.33.16 (cherry-pick) (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@3.30
Patch Set: Created 5 years, 11 months ago
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1 // Copyright 2010 the V8 project authors. All rights reserved. 1 // Copyright 2010 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 // This file is an internal atomic implementation, use atomicops.h instead. 5 // This file is an internal atomic implementation, use atomicops.h instead.
6 6
7 #ifndef V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_ 7 #ifndef V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_
8 #define V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_ 8 #define V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_
9 9
10 namespace v8 { 10 namespace v8 {
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29 "1:\n" 29 "1:\n"
30 "ll %0, 0(%4)\n" // prev = *ptr 30 "ll %0, 0(%4)\n" // prev = *ptr
31 "bne %0, %2, 2f\n" // if (prev != old_value) goto 2 31 "bne %0, %2, 2f\n" // if (prev != old_value) goto 2
32 "move %1, %3\n" // tmp = new_value 32 "move %1, %3\n" // tmp = new_value
33 "sc %1, 0(%4)\n" // *ptr = tmp (with atomic check) 33 "sc %1, 0(%4)\n" // *ptr = tmp (with atomic check)
34 "beqz %1, 1b\n" // start again on atomic error 34 "beqz %1, 1b\n" // start again on atomic error
35 "nop\n" // delay slot nop 35 "nop\n" // delay slot nop
36 "2:\n" 36 "2:\n"
37 ".set pop\n" 37 ".set pop\n"
38 : "=&r" (prev), "=&r" (tmp) 38 : "=&r" (prev), "=&r" (tmp)
39 : "Ir" (old_value), "r" (new_value), "r" (ptr) 39 : "r" (old_value), "r" (new_value), "r" (ptr)
40 : "memory"); 40 : "memory");
41 return prev; 41 return prev;
42 } 42 }
43 43
44 // Atomically store new_value into *ptr, returning the previous value held in 44 // Atomically store new_value into *ptr, returning the previous value held in
45 // *ptr. This routine implies no memory barriers. 45 // *ptr. This routine implies no memory barriers.
46 inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr, 46 inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
47 Atomic32 new_value) { 47 Atomic32 new_value) {
48 Atomic32 temp, old; 48 Atomic32 temp, old;
49 __asm__ __volatile__(".set push\n" 49 __asm__ __volatile__(".set push\n"
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151 } 151 }
152 152
153 inline Atomic32 Release_Load(volatile const Atomic32* ptr) { 153 inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
154 MemoryBarrier(); 154 MemoryBarrier();
155 return *ptr; 155 return *ptr;
156 } 156 }
157 157
158 } } // namespace v8::base 158 } } // namespace v8::base
159 159
160 #endif // V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_ 160 #endif // V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_
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