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Fix CAS and improve branch check

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This commit is contained in:
Chad Rakoczy 2026-01-19 19:04:59 +00:00
parent 0ea660840a
commit ba4f422263
1 changed files with 6 additions and 9 deletions
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15
src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
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@ -2227,20 +2227,17 @@ void MacroAssembler::profile_receiver_type(Register recv, Register mdp, int mdp_
cmp(rscratch2, recv);
br(Assembler::EQ, L_found_recv);
add(offset, offset, receiver_step);
mov(rscratch2, end_receiver_offset);
cmp(offset, rscratch2);
br(Assembler::NE, L_loop_search_receiver);
sub(rscratch2, offset, end_receiver_offset);
cbnz(rscratch2, 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));
cmp(rscratch2, (u1)NULL_WORD);
br(Assembler::EQ, L_found_empty);
cbz(rscratch2, L_found_empty);
add(offset, offset, receiver_step);
mov(rscratch2, end_receiver_offset);
cmp(offset, rscratch2);
br(Assembler::NE, L_loop_search_empty);
sub(rscratch2, offset, end_receiver_offset);
cbnz(rscratch2, L_loop_search_empty);
b(L_polymorphic);
// Slow: try to install receiver
@ -2253,7 +2250,7 @@ void MacroAssembler::profile_receiver_type(Register recv, Register mdp, int mdp_
lea(rscratch2, Address(mdp, offset));
cmpxchg(/*addr*/ rscratch2, /*expected*/ zr, /*new*/ recv, Assembler::xword,
/*acquire*/ true, /*release*/ false, /*weak*/ false, noreg);
/*acquire*/ false, /*release*/ false, /*weak*/ false, 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,