[clang] [CIR] Upstream basic alloca and load support (PR #128792)

[Erich Keane via cfe-commits]

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@@ -0,0 +1,128 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This contains code to emit Expr nodes as CIR code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Address.h"
+#include "CIRGenFunction.h"
+#include "CIRGenValue.h"
+#include "clang/AST/Attr.h"
+#include "clang/AST/CharUnits.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/Expr.h"
+#include "clang/CIR/Dialect/IR/CIRDialect.h"
+#include "clang/CIR/MissingFeatures.h"
+
+using namespace clang;
+using namespace clang::CIRGen;
+using namespace cir;
+
+mlir::Value CIRGenFunction::emitLoadOfScalar(LValue lvalue,
+                                             SourceLocation loc) {
+  assert(!cir::MissingFeatures::opLoadThreadLocal());
+  assert(!cir::MissingFeatures::opLoadEmitScalarRangeCheck());
+  assert(!cir::MissingFeatures::opLoadBooleanRepresentation());
+
+  Address addr = lvalue.getAddress();
+  mlir::Type eltTy = addr.getElementType();
+
+  auto ptr = addr.getPointer();
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erichkeane wrote:

I think this is a case where we're not supposed to use 'auto'?

https://github.com/llvm/llvm-project/pull/128792