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7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()

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Use shorter instruction sequences for atomic add and atomic exchange when possible.

Reviewed-by: kvn, jrose
This commit is contained in:
Roland Westrelin 2012-09-20 16:49:17 +02:00
parent 25f18c20d9
commit 302540691b
38 changed files with 880 additions and 124 deletions
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11
hotspot/src/share/vm/runtime/vm_version.hpp
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@ -37,6 +37,10 @@ class Abstract_VM_Version: AllStatic {
static const char* _s_internal_vm_info_string;
// These are set by machine-dependent initializations
static bool _supports_cx8;
static bool _supports_atomic_getset4;
static bool _supports_atomic_getset8;
static bool _supports_atomic_getadd4;
static bool _supports_atomic_getadd8;
static unsigned int _logical_processors_per_package;
static int _vm_major_version;
static int _vm_minor_version;
@ -75,6 +79,13 @@ class Abstract_VM_Version: AllStatic {
// does HW support an 8-byte compare-exchange operation?
static bool supports_cx8() {return _supports_cx8;}
// does HW support atomic get-and-set or atomic get-and-add? Used
// to guide intrinsification decisions for Unsafe atomic ops
static bool supports_atomic_getset4() {return _supports_atomic_getset4;}
static bool supports_atomic_getset8() {return _supports_atomic_getset8;}
static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;}
static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;}
static unsigned int logical_processors_per_package() {
return _logical_processors_per_package;
}