[llvm] [GlobalOpt] Add range metadata to loads from constant global variables (PR #127695)

[Nikita Popov via llvm-commits]

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@@ -2498,6 +2499,102 @@ OptimizeGlobalAliases(Module &M,
   return Changed;
 }
 
+static bool AddRangeMetadata(Module &M) {
+  const DataLayout &DL = M.getDataLayout();
+  bool Changed = false;
+
+  for (GlobalValue &Global : M.global_values()) {
+
+    auto *GV = dyn_cast<GlobalVariable>(&Global);
+    if (!GV || !GV->hasDefinitiveInitializer())
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nikic wrote:

Missing check that the global is constant? Please add a negative test with non-constant global.

https://github.com/llvm/llvm-project/pull/127695