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8026049: (bf) Intrinsify ByteBuffer.put{Int, Double, Float, ...} methods

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Use unaligned Unsafe loads and stores for ByteBuffer access on platforms which support unaligned access. Add intrinsics for Unsafe.{get,put}-X-Unaligned methods.

Reviewed-by: dholmes, jrose, psandoz, kvn
This commit is contained in:
Andrew Haley 2015-03-31 12:31:18 -07:00
parent 61aa1cfdef
commit 1dfbc44c1f
11 changed files with 486 additions and 7 deletions
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21
hotspot/src/share/vm/prims/unsafe.cpp
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@ -324,6 +324,24 @@ UNSAFE_END
#endif // not SUPPORTS_NATIVE_CX8
UNSAFE_ENTRY(jboolean, Unsafe_isBigEndian0(JNIEnv *env, jobject unsafe))
UnsafeWrapper("Unsafe_IsBigEndian0");
{
#ifdef VM_LITTLE_ENDIAN
return false;
#else
return true;
#endif
}
UNSAFE_END
UNSAFE_ENTRY(jint, Unsafe_unalignedAccess0(JNIEnv *env, jobject unsafe))
UnsafeWrapper("Unsafe_UnalignedAccess0");
{
return UseUnalignedAccesses;
}
UNSAFE_END
#define DEFINE_GETSETOOP(jboolean, Boolean) \
\
UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
@ -1261,6 +1279,9 @@ static JNINativeMethod methods[] = {
{CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
{CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
{CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
{CC"isBigEndian0", CC"()Z", FN_PTR(Unsafe_isBigEndian0)},
{CC"unalignedAccess0", CC"()Z", FN_PTR(Unsafe_unalignedAccess0)}
};
#undef CC