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8152840: aarch64: improve _unsafe_arraycopy stub routine

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Aarch64: improve StubRoutines::_unsafe_arraycopy stub routine

Reviewed-by: aph
This commit is contained in:
Fei Yang 2016-03-28 21:21:41 +08:00
parent 586f496119
commit 755b6af36e
1 changed files with 33 additions and 8 deletions
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41
hotspot/src/cpu/aarch64/vm/stubGenerator_aarch64.cpp
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@ -1711,20 +1711,42 @@ class StubGenerator: public StubCodeGenerator {
// to a long, int, short, or byte copy loop.
//
address generate_unsafe_copy(const char *name,
address byte_copy_entry) {
#ifdef PRODUCT
return StubRoutines::_jbyte_arraycopy;
#else
address byte_copy_entry,
address short_copy_entry,
address int_copy_entry,
address long_copy_entry) {
Label L_long_aligned, L_int_aligned, L_short_aligned;
Register s = c_rarg0, d = c_rarg1, count = c_rarg2;
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", name);
address start = __ pc();
__ enter(); // required for proper stackwalking of RuntimeStub frame
// bump this on entry, not on exit:
__ lea(rscratch2, ExternalAddress((address)&SharedRuntime::_unsafe_array_copy_ctr));
__ incrementw(Address(rscratch2));
inc_counter_np(SharedRuntime::_unsafe_array_copy_ctr);
__ orr(rscratch1, s, d);
__ orr(rscratch1, rscratch1, count);
__ andr(rscratch1, rscratch1, BytesPerLong-1);
__ cbz(rscratch1, L_long_aligned);
__ andr(rscratch1, rscratch1, BytesPerInt-1);
__ cbz(rscratch1, L_int_aligned);
__ tbz(rscratch1, 0, L_short_aligned);
__ b(RuntimeAddress(byte_copy_entry));
__ BIND(L_short_aligned);
__ lsr(count, count, LogBytesPerShort); // size => short_count
__ b(RuntimeAddress(short_copy_entry));
__ BIND(L_int_aligned);
__ lsr(count, count, LogBytesPerInt); // size => int_count
__ b(RuntimeAddress(int_copy_entry));
__ BIND(L_long_aligned);
__ lsr(count, count, LogBytesPerLong); // size => long_count
__ b(RuntimeAddress(long_copy_entry));
return start;
#endif
}
//
@ -2090,7 +2112,10 @@ class StubGenerator: public StubCodeGenerator {
/*dest_uninitialized*/true);
StubRoutines::_unsafe_arraycopy = generate_unsafe_copy("unsafe_arraycopy",
entry_jbyte_arraycopy);
entry_jbyte_arraycopy,
entry_jshort_arraycopy,
entry_jint_arraycopy,
entry_jlong_arraycopy);
StubRoutines::_generic_arraycopy = generate_generic_copy("generic_arraycopy",
entry_jbyte_arraycopy,