================
@@ -1001,6 +1004,72 @@ bool AArch64ExpandPseudo::expandStoreSwiftAsyncContext(
return true;
}
+bool AArch64ExpandPseudo::expandSTSHHAtomicStore(
+ MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI) {
+ MachineInstr &MI = *MBBI;
+ DebugLoc DL(MI.getDebugLoc());
+
+ unsigned Order = MI.getOperand(2).getImm();
+ uint64_t Policy = MI.getOperand(3).getImm();
+ unsigned Size = MI.getOperand(4).getImm();
+
+ bool IsRelaxed = Order == 0;
+ unsigned StoreOpc = 0;
+
+ // __ATOMIC_RELAXED uses STR. __ATOMIC_{RELEASE/SEQ_CST} use STLR.
----------------
CarolineConcatto wrote:
I cannot find the documentation about this in here:
https://developer.arm.com/documentation/ddi0602/2025-09/Base-Instructions/STSHH--Store-shared-hint-?lang=en
Do you mind sharing where this is coming from.
https://github.com/llvm/llvm-project/pull/181386
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