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src/os_cpu/linux_s390/vm/atomic_linux_s390.hpp

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rev 13452 : [mq]: coleen_review1
rev 13453 : [mq]: dholmes_review1

*** 476,494 **** --- 476,496 ---- // The s390 processors always fence before and after the csg instructions. // Thus we ignore the memory ordering argument. The docu says: "A serialization // function is performed before the operand is fetched and again after the // operation is completed." + // No direct support for cmpxchg of bytes; emulate using int. template<> struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {}; template<> template<typename T> inline T Atomic::PlatformCmpxchg<4>::operator()(T xchg_val, T volatile* dest, T cmp_val, cmpxchg_memory_order unused) const { + STATIC_ASSERT(4 == sizeof(T)); unsigned long old; __asm__ __volatile__ ( " CS %[old],%[upd],%[mem] \n\t" // Try to xchg upd with mem. // outputs
*** 508,518 **** template<typename T> inline T Atomic::PlatformCmpxchg<8>::operator()(T xchg_val, T volatile* dest, T cmp_val, cmpxchg_memory_order unused) const { ! unsigned long old; __asm__ __volatile__ ( " CSG %[old],%[upd],%[mem] \n\t" // Try to xchg upd with mem. // outputs : [old] "=&d" (old) // Write-only, prev value irrelevant. --- 510,521 ---- template<typename T> inline T Atomic::PlatformCmpxchg<8>::operator()(T xchg_val, T volatile* dest, T cmp_val, cmpxchg_memory_order unused) const { ! STATIC_ASSERT(8 == sizeof(T)); ! T old; __asm__ __volatile__ ( " CSG %[old],%[upd],%[mem] \n\t" // Try to xchg upd with mem. // outputs : [old] "=&d" (old) // Write-only, prev value irrelevant.
*** 522,532 **** , "0" (cmp_val) // Read-only, initial value for [old] (operand #0). // clobbered : "cc" ); ! return IntegerTypes::cast<T>(old); } inline jlong Atomic::load(const volatile jlong* src) { return *src; } #endif // OS_CPU_LINUX_S390_VM_ATOMIC_LINUX_S390_INLINE_HPP --- 525,535 ---- , "0" (cmp_val) // Read-only, initial value for [old] (operand #0). // clobbered : "cc" ); ! return old; } inline jlong Atomic::load(const volatile jlong* src) { return *src; } #endif // OS_CPU_LINUX_S390_VM_ATOMIC_LINUX_S390_INLINE_HPP
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