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8138894: C1: Support IRIW on weak memory platforms

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Reviewed-by: twisti, goetz
This commit is contained in:
Martin Doerr 2015-10-21 10:37:50 +02:00
parent 26f02e4686
commit 9a5f4d56ff
4 changed files with 22 additions and 6 deletions
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12
hotspot/src/share/vm/c1/c1_LIRGenerator.cpp
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@ -1761,7 +1761,7 @@ void LIRGenerator::do_StoreField(StoreField* x) {
post_barrier(object.result(), value.result());
}
if (is_volatile && os::is_MP()) {
if (!support_IRIW_for_not_multiple_copy_atomic_cpu && is_volatile && os::is_MP()) {
__ membar();
}
}
@ -1822,6 +1822,10 @@ void LIRGenerator::do_LoadField(LoadField* x) {
address = generate_address(object.result(), x->offset(), field_type);
}
if (support_IRIW_for_not_multiple_copy_atomic_cpu && is_volatile && os::is_MP()) {
__ membar();
}
bool needs_atomic_access = is_volatile || AlwaysAtomicAccesses;
if (needs_atomic_access && !needs_patching) {
volatile_field_load(address, reg, info);
@ -2238,6 +2242,10 @@ void LIRGenerator::do_UnsafeGetObject(UnsafeGetObject* x) {
LIR_Opr value = rlock_result(x, x->basic_type());
if (support_IRIW_for_not_multiple_copy_atomic_cpu && x->is_volatile() && os::is_MP()) {
__ membar();
}
get_Object_unsafe(value, src.result(), off.result(), type, x->is_volatile());
#if INCLUDE_ALL_GCS
@ -2395,7 +2403,7 @@ void LIRGenerator::do_UnsafePutObject(UnsafePutObject* x) {
if (x->is_volatile() && os::is_MP()) __ membar_release();
put_Object_unsafe(src.result(), off.result(), data.result(), type, x->is_volatile());
if (x->is_volatile() && os::is_MP()) __ membar();
if (!support_IRIW_for_not_multiple_copy_atomic_cpu && x->is_volatile() && os::is_MP()) __ membar();
}