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8385915: RISC-V: Remove unused cmpxchg* methods

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Reviewed-by: fyang, dzhang
This commit is contained in:
Gui Cao 2026-06-04 01:48:51 +00:00 committed by Dingli Zhang
parent 7ebfc031bc
commit 19146ad7ca
2 changed files with 0 additions and 46 deletions
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44
src/hotspot/cpu/riscv/macroAssembler_riscv.cpp
View File

@ -4176,50 +4176,6 @@ void MacroAssembler::safepoint_poll(Label& slow_path, bool at_return, bool in_nm
}
}
void MacroAssembler::cmpxchgptr(Register oldv, Register newv, Register addr, Register tmp,
Label &succeed, Label *fail) {
assert_different_registers(addr, tmp, t0);
assert_different_registers(newv, tmp, t0);
assert_different_registers(oldv, tmp, t0);
// oldv holds comparison value
// newv holds value to write in exchange
// addr identifies memory word to compare against/update
if (UseZacas) {
mv(tmp, oldv);
atomic_cas(tmp, newv, addr, Assembler::int64, Assembler::aq, Assembler::rl);
beq(tmp, oldv, succeed);
} else {
Label retry_load, nope;
bind(retry_load);
// Load reserved from the memory location
load_reserved(tmp, addr, int64, Assembler::aqrl);
// Fail and exit if it is not what we expect
bne(tmp, oldv, nope);
// If the store conditional succeeds, tmp will be zero
store_conditional(tmp, newv, addr, int64, Assembler::rl);
beqz(tmp, succeed);
// Retry only when the store conditional failed
j(retry_load);
bind(nope);
}
// neither amocas nor lr/sc have an implied barrier in the failing case
membar(AnyAny);
mv(oldv, tmp);
if (fail != nullptr) {
j(*fail);
}
}
void MacroAssembler::cmpxchg_obj_header(Register oldv, Register newv, Register obj, Register tmp,
Label &succeed, Label *fail) {
assert(oopDesc::mark_offset_in_bytes() == 0, "assumption");
cmpxchgptr(oldv, newv, obj, tmp, succeed, fail);
}
void MacroAssembler::load_reserved(Register dst,
Register addr,
Assembler::operand_size size,

2
src/hotspot/cpu/riscv/macroAssembler_riscv.hpp
View File

@ -1203,8 +1203,6 @@ public:
#undef INSN_ENTRY_RELOC
void cmpxchg_obj_header(Register oldv, Register newv, Register obj, Register tmp, Label &succeed, Label *fail);
void cmpxchgptr(Register oldv, Register newv, Register addr, Register tmp, Label &succeed, Label *fail);
void cmpxchg(Register addr, Register expected,
Register new_val,
Assembler::operand_size size,