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Use increment macro

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This commit is contained in:
Chad Rakoczy 2026-01-22 00:43:25 +00:00
parent ba4f422263
commit 555e0afa58
1 changed files with 15 additions and 18 deletions
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33
src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
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@ -2160,13 +2160,11 @@ void MacroAssembler::profile_receiver_type(Register recv, Register mdp, int mdp_
// Corner case: no profile table. Increment poly counter and exit.
if (ReceiverTypeData::row_limit() == 0) {
ldr(rscratch1, Address(mdp, poly_count_offset));
add(rscratch1, rscratch1, DataLayout::counter_increment);
str(rscratch1, Address(mdp, poly_count_offset));
increment(Address(mdp, poly_count_offset), DataLayout::counter_increment);
return;
}
Register offset = rscratch1;
Register offset = rscratch2;
Label L_loop_search_receiver, L_loop_search_empty;
Label L_restart, L_found_recv, L_found_empty, L_polymorphic, L_count_update;
@ -2223,21 +2221,21 @@ void MacroAssembler::profile_receiver_type(Register recv, Register mdp, int mdp_
// Fastest: receiver is already installed
mov(offset, base_receiver_offset);
bind(L_loop_search_receiver);
ldr(rscratch2, Address(mdp, offset));
cmp(rscratch2, recv);
ldr(rscratch1, Address(mdp, offset));
cmp(rscratch1, recv);
br(Assembler::EQ, L_found_recv);
add(offset, offset, receiver_step);
sub(rscratch2, offset, end_receiver_offset);
cbnz(rscratch2, L_loop_search_receiver);
sub(rscratch1, offset, end_receiver_offset);
cbnz(rscratch1, L_loop_search_receiver);
// Fast: no receiver, but profile is full
mov(offset, base_receiver_offset);
bind(L_loop_search_empty);
ldr(rscratch2, Address(mdp, offset));
cbz(rscratch2, L_found_empty);
ldr(rscratch1, Address(mdp, offset));
cbz(rscratch1, L_found_empty);
add(offset, offset, receiver_step);
sub(rscratch2, offset, end_receiver_offset);
cbnz(rscratch2, L_loop_search_empty);
sub(rscratch1, offset, end_receiver_offset);
cbnz(rscratch1, L_loop_search_empty);
b(L_polymorphic);
// Slow: try to install receiver
@ -2245,12 +2243,13 @@ void MacroAssembler::profile_receiver_type(Register recv, Register mdp, int mdp_
// Atomically swing receiver slot: null -> recv.
//
// The update code uses CAS, which clobbers rscratch1. However we
// will no longer need this value so we do not need to save it.
// The update uses CAS, which clobbers rscratch1. Therefore, rscratch2
// is used to hold the destination address. This is safe because the
// offset is no longer needed after the address is computed.
lea(rscratch2, Address(mdp, offset));
cmpxchg(/*addr*/ rscratch2, /*expected*/ zr, /*new*/ recv, Assembler::xword,
/*acquire*/ false, /*release*/ false, /*weak*/ false, noreg);
/*acquire*/ false, /*release*/ false, /*weak*/ true, noreg);
// CAS success means the slot now has the receiver we want. CAS failure means
// something had claimed the slot concurrently: it can be the same receiver we want,
@ -2270,9 +2269,7 @@ void MacroAssembler::profile_receiver_type(Register recv, Register mdp, int mdp_
add(offset, offset, receiver_to_count_step);
bind(L_count_update);
ldr(rscratch2, Address(mdp, offset));
add(rscratch2, rscratch2, DataLayout::counter_increment);
str(rscratch2, Address(mdp, offset));
increment(Address(mdp, offset), DataLayout::counter_increment);
}