================
@@ -18521,7 +18522,25 @@ AArch64TargetLowering::getTargetMMOFlags(const
Instruction &I) const {
if (Subtarget->getProcFamily() == AArch64Subtarget::Falkor &&
I.hasMetadata(FALKOR_STRIDED_ACCESS_MD))
return MOStridedAccess;
- return MachineMemOperand::MONone;
+
+ auto Flags = MachineMemOperand::MONone;
+ const MDNode *AtomicStHint = I.getMetadata(AARCH64_ATOMIC_STORE_HINT_MD);
+ if (AtomicStHint) {
+ unsigned HintVal =
+ cast<ConstantInt>(
+ cast<ConstantAsMetadata>(AtomicStHint->getOperand(0))->getValue())
+ ->getZExtValue();
+ AArch64AtomicStoreHint Hint = getAtomicStoreHintFromMD(HintVal);
+ assert(Hint != AArch64AtomicStoreHint::HINT_NONE &&
+ "Unrecognised atomic hint value requested.");
----------------
kmclaughlin-arm wrote:
Unfortunately I can't just use `HintVal` here, because the immediate values
from the metadata don't exactly match the values represented in
`AArch64AtomicStoreHint`.
i.e. the docs specify that the hint values allowed are 0 (`HINT_STSHH_KEEP`)
and 1 (`HINT_STSHH_STRM`). However, the value of `AArch64AtomicStoreHint`
represented by 0 is `HINT_NONE`, meaning that neither `MOAtomicHintBit0` or
`MOAtomicHintBit1` were set. I can try to change the LLVM intrinsic to use
different immediate values to the builtin, but I'm not sure that makes sense.
https://github.com/llvm/llvm-project/pull/198316
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