[llvm] [LLVM][SelectionDAG] Align poison/undef binop folds with IR. (PR #149334)

[Paul Walker via llvm-commits]

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@@ -0,0 +1,454 @@
+//===---- llvm/unittest/CodeGen/SelectionDAGPatternMatchTest.cpp  ---------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/OptimizationRemarkEmitter.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/AsmParser/Parser.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/SDPatternMatch.h"
+#include "llvm/CodeGen/TargetLowering.h"
+#include "llvm/IR/Module.h"
+#include "llvm/MC/TargetRegistry.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Target/TargetMachine.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+class SelectionDAGnodeConstructionTest : public testing::Test {
+protected:
+  static void SetUpTestCase() {
+    InitializeAllTargets();
+    InitializeAllTargetMCs();
+  }
+
+  void SetUp() override {
+    StringRef Assembly = "@g = global i32 0\n"
+                         "@g_alias = alias i32, i32* @g\n"
+                         "define i32 @f() {\n"
+                         "  %1 = load i32, i32* @g\n"
+                         "  ret i32 %1\n"
+                         "}";
+
+    Triple TargetTriple("riscv64--");
+    std::string Error;
+    const Target *T = TargetRegistry::lookupTarget("", TargetTriple, Error);
+    // FIXME: These tests do not depend on RISCV specifically, but we have to
+    // initialize a target. A skeleton Target for unittests would allow us to
+    // always run these tests.
+    if (!T)
+      GTEST_SKIP();
+
+    TargetOptions Options;
+    TM = std::unique_ptr<TargetMachine>(T->createTargetMachine(
+        TargetTriple, "", "+m,+f,+d,+v", Options, std::nullopt, std::nullopt,
+        CodeGenOptLevel::Aggressive));
+    if (!TM)
+      GTEST_SKIP();
+
+    SMDiagnostic SMError;
+    M = parseAssemblyString(Assembly, SMError, Context);
+    if (!M)
+      report_fatal_error(SMError.getMessage());
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paulwalker-arm wrote:

I've converted them to ASSERT_TRUE.

https://github.com/llvm/llvm-project/pull/149334