[llvm] [LLVM] Add a C API for creating instructions with custom syncscopes. (PR #104775)

[Tim Besard via llvm-commits]

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@@ -4309,6 +4332,22 @@ LLVMValueRef LLVMBuildAtomicRMW(LLVMBuilderRef B,LLVMAtomicRMWBinOp op,
       singleThread ? SyncScope::SingleThread : SyncScope::System));
 }
 
+LLVMValueRef LLVMBuildAtomicRMWSyncScope(LLVMBuilderRef B,
+                                         LLVMAtomicRMWBinOp op,
+                                         LLVMValueRef PTR, LLVMValueRef Val,
+                                         LLVMAtomicOrdering ordering,
+                                         unsigned SSID) {
+  AtomicRMWInst::BinOp intop = mapFromLLVMRMWBinOp(op);
+
+  SmallVector<StringRef> SSNs;
+  unwrap(B)->getContext().getSyncScopeNames(SSNs);
+  assert(SSID < SSNs.size() && "Invalid SyncScopeID");
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maleadt wrote:

Oh sorry, didn't mean to commit this, this was just for debugging.

https://github.com/llvm/llvm-project/pull/104775