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8252311: AArch64: save two words in itable lookup stub

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Reviewed-by: adinn, aph
This commit is contained in:
Boris Ulasevich 2020-09-19 07:47:37 +00:00
parent 22f7af7fcf
commit 224a30f12c
1 changed files with 14 additions and 19 deletions
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33
src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
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@ -1004,27 +1004,22 @@ void MacroAssembler::lookup_interface_method(Register recv_klass,
// }
Label search, found_method;
for (int peel = 1; peel >= 0; peel--) {
ldr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset_in_bytes()));
cmp(intf_klass, method_result);
if (peel) {
br(Assembler::EQ, found_method);
} else {
br(Assembler::NE, search);
// (invert the test to fall through to found_method...)
}
if (!peel) break;
bind(search);
// Check that the previous entry is non-null. A null entry means that
// the receiver class doesn't implement the interface, and wasn't the
// same as when the caller was compiled.
cbz(method_result, L_no_such_interface);
ldr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset_in_bytes()));
cmp(intf_klass, method_result);
br(Assembler::EQ, found_method);
bind(search);
// Check that the previous entry is non-null. A null entry means that
// the receiver class doesn't implement the interface, and wasn't the
// same as when the caller was compiled.
cbz(method_result, L_no_such_interface);
if (itableOffsetEntry::interface_offset_in_bytes() != 0) {
add(scan_temp, scan_temp, scan_step);
ldr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset_in_bytes()));
} else {
ldr(method_result, Address(pre(scan_temp, scan_step)));
}
cmp(intf_klass, method_result);
br(Assembler::NE, search);
bind(found_method);