[Analysis] add unit test file for VectorUtils; NFC

llvm-svn: 362972

Author: rotateright

llvm/unittests/Analysis/CMakeLists.txt

@@ -34,4 +34,5 @@ add_llvm_unittest(AnalysisTests
   UnrollAnalyzerTest.cpp
   ValueLatticeTest.cpp
   ValueTrackingTest.cpp
+  VectorUtilsTest.cpp
   )

llvm/unittests/Analysis/VectorUtilsTest.cpp

@@ -0,0 +1,91 @@
+//===- VectorUtilsTest.cpp - VectorUtils tests ------------------------===//
+//
+// 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/VectorUtils.h"
+#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/AsmParser/Parser.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/InstIterator.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/KnownBits.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+namespace {
+
+class VectorUtilsTest : public testing::Test {
+protected:
+  void parseAssembly(const char *Assembly) {
+    SMDiagnostic Error;
+    M = parseAssemblyString(Assembly, Error, Context);
+
+    std::string errMsg;
+    raw_string_ostream os(errMsg);
+    Error.print("", os);
+
+    // A failure here means that the test itself is buggy.
+    if (!M)
+      report_fatal_error(os.str());
+
+    Function *F = M->getFunction("test");
+    if (F == nullptr)
+      report_fatal_error("Test must have a function named @test");
+
+    A = nullptr;
+    for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
+      if (I->hasName()) {
+        if (I->getName() == "A")
+          A = &*I;
+      }
+    }
+    if (A == nullptr)
+      report_fatal_error("@test must have an instruction %A");
+  }
+
+  LLVMContext Context;
+  std::unique_ptr<Module> M;
+  Instruction *A;
+};
+
+} // namespace
+
+TEST_F(VectorUtilsTest, getSplatValueElt0) {
+  parseAssembly(
+      "define <2 x i8> @test(i8 %x) {\n"
+      "  %ins = insertelement <2 x i8> undef, i8 %x, i32 0\n"
+      "  %A = shufflevector <2 x i8> %ins, <2 x i8> undef, <2 x i32> zeroinitializer\n"
+      "  ret <2 x i8> %A\n"
+      "}\n");
+  EXPECT_EQ(getSplatValue(A)->getName(), "x");
+}
+
+TEST_F(VectorUtilsTest, getSplatValueEltMismatch) {
+  parseAssembly(
+      "define <2 x i8> @test(i8 %x) {\n"
+      "  %ins = insertelement <2 x i8> undef, i8 %x, i32 1\n"
+      "  %A = shufflevector <2 x i8> %ins, <2 x i8> undef, <2 x i32> zeroinitializer\n"
+      "  ret <2 x i8> %A\n"
+      "}\n");
+  EXPECT_EQ(getSplatValue(A), nullptr);
+}
+
+// TODO: This is a splat, but we don't recognize it.
+
+TEST_F(VectorUtilsTest, getSplatValueElt1) {
+  parseAssembly(
+      "define <2 x i8> @test(i8 %x) {\n"
+      "  %ins = insertelement <2 x i8> undef, i8 %x, i32 1\n"
+      "  %A = shufflevector <2 x i8> %ins, <2 x i8> undef, <2 x i32> <i32 1, i32 1>\n"
+      "  ret <2 x i8> %A\n"
+      "}\n");
+  EXPECT_EQ(getSplatValue(A), nullptr);
+}