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8316186: RISC-V: Remove PlatformCmpxchg<4>

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Reviewed-by: fyang, mli
This commit is contained in:
Robbin Ehn 2023-10-01 16:33:54 +00:00
parent fb055e7e53
commit b8fa6c23f5
1 changed files with 2 additions and 35 deletions

37
src/hotspot/os_cpu/linux_riscv/atomic_linux_riscv.hpp

@ -152,50 +152,17 @@ inline T Atomic::PlatformCmpxchg<byte_size>::operator()(T volatile* dest __attri
#endif
STATIC_ASSERT(byte_size == sizeof(T));
T value = compare_value;
if (order != memory_order_relaxed) {
FULL_MEM_BARRIER;
}
__atomic_compare_exchange(dest, &value, &exchange_value, /* weak */ false,
__atomic_compare_exchange(dest, &compare_value, &exchange_value, /* weak */ false,
__ATOMIC_RELAXED, __ATOMIC_RELAXED);
if (order != memory_order_relaxed) {
FULL_MEM_BARRIER;
}
return value;
}
template<>
template<typename T>
inline T Atomic::PlatformCmpxchg<4>::operator()(T volatile* dest __attribute__((unused)),
T compare_value,
T exchange_value,
atomic_memory_order order) const {
STATIC_ASSERT(4 == sizeof(T));
T old_value;
long rc;
if (order != memory_order_relaxed) {
FULL_MEM_BARRIER;
}
__asm__ __volatile__ (
"1: sext.w %1, %3 \n\t" // sign-extend compare_value
" lr.w %0, %2 \n\t"
" bne %0, %1, 2f \n\t"
" sc.w %1, %4, %2 \n\t"
" bnez %1, 1b \n\t"
"2: \n\t"
: /*%0*/"=&r" (old_value), /*%1*/"=&r" (rc), /*%2*/"+A" (*dest)
: /*%3*/"r" (compare_value), /*%4*/"r" (exchange_value)
: "memory" );
if (order != memory_order_relaxed) {
FULL_MEM_BARRIER;
}
return old_value;
return compare_value;
}
template<size_t byte_size>