[llvm] [IPSCCP] Variable not visible at Og. (PR #66745)

[Carlos Alberto Enciso via llvm-commits]

================
@@ -3074,6 +3074,44 @@ void llvm::hoistAllInstructionsInto(BasicBlock *DomBlock, Instruction *InsertPt,
                    BB->getTerminator()->getIterator());
 }
 
+DIExpression *llvm::getExpressionForConstant(DIBuilder &DIB, const Constant &C,
+                                             Type &Ty) {
+
+  // Create integer constant expression.
+  auto createIntegerExpression = [&DIB](const Constant &CV) -> DIExpression * {
+    const APInt &API = cast<ConstantInt>(&CV)->getValue();
+    std::optional<int64_t> InitIntOpt = API.trySExtValue();
+    return InitIntOpt ? DIB.createConstantValueExpression(
+                            static_cast<uint64_t>(*InitIntOpt))
+                      : nullptr;
+  };
+
+  if (Ty.isIntegerTy())
+    return createIntegerExpression(C);
+
+  if (Ty.isFloatTy() || Ty.isDoubleTy()) {
+    const APFloat &APF = cast<ConstantFP>(&C)->getValueAPF();
+    return DIB.createConstantValueExpression(
+        APF.bitcastToAPInt().getZExtValue());
+  }
+
+  if (!Ty.isPointerTy())
+    return nullptr;
+
+  if (isa<ConstantPointerNull>(C))
+    return DIB.createConstantValueExpression(0);
+
+  if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(&C)) {
+    if (CE->getNumOperands() == 1) {
----------------
CarlosAlbertoEnciso wrote:

Very good suggestion.

https://github.com/llvm/llvm-project/pull/66745