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8317575: AArch64: C2_MacroAssembler::fast_lock uses rscratch1 for cmpxchg result

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Reviewed-by: thartmann, kvn, aph
This commit is contained in:
Stefan Karlsson 2023-10-20 07:05:30 +00:00
parent d9ce525a1c
commit 387504c9e4
1 changed files with 2 additions and 2 deletions

4
src/hotspot/cpu/aarch64/c2_MacroAssembler_aarch64.cpp

@ -117,7 +117,7 @@ void C2_MacroAssembler::fast_lock(Register objectReg, Register boxReg, Register
// Try to CAS m->owner from NULL to current thread.
add(tmp, disp_hdr, (in_bytes(ObjectMonitor::owner_offset())-markWord::monitor_value));
cmpxchg(tmp, zr, rthread, Assembler::xword, /*acquire*/ true,
/*release*/ true, /*weak*/ false, rscratch1); // Sets flags for result
/*release*/ true, /*weak*/ false, tmp3Reg); // Sets flags for result
if (LockingMode != LM_LIGHTWEIGHT) {
// Store a non-null value into the box to avoid looking like a re-entrant
@ -129,7 +129,7 @@ void C2_MacroAssembler::fast_lock(Register objectReg, Register boxReg, Register
}
br(Assembler::EQ, cont); // CAS success means locking succeeded
cmp(rscratch1, rthread);
cmp(tmp3Reg, rthread);
br(Assembler::NE, cont); // Check for recursive locking
// Recursive lock case