[llvm-branch-commits] [clang] [AllocToken, Clang] Implement TypeHashPointerSplit mode (PR #156840)

[Oliver Hunt via llvm-branch-commits]

================
@@ -183,12 +201,20 @@ class TypeHashMode : public ModeBase {
   using ModeBase::ModeBase;
 
   uint64_t operator()(const CallBase &CB, OptimizationRemarkEmitter &ORE) {
+    const auto [N, H] = getHash(CB, ORE);
+    return N ? boundedToken(H) : H;
+  }
+
+protected:
+  std::pair<MDNode *, uint64_t> getHash(const CallBase &CB,
+                                        OptimizationRemarkEmitter &ORE) {
     if (MDNode *N = getAllocTokenMetadata(CB)) {
       MDString *S = cast<MDString>(N->getOperand(0));
-      return boundedToken(xxHash64(S->getString()));
+      return {N, xxHash64(S->getString())};
----------------
ojhunt wrote:

You could use SipHash - we use that for ptrauth so it's necessarily abi stable

https://github.com/llvm/llvm-project/pull/156840
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