[TLI] Add getLibFunc that accepts an Opcode and scalar Type. (#75919)

It sets a LibFunc similarly with the other two getLibFunc methods.
Currently, it supports only the FRem Instruction.

Add tests for FRem.

1 files changed, 35 insertions, 0 deletions

diff --git a/llvm/unittests/Analysis/TargetLibraryInfoTest.cpp b/llvm/unittests/Analysis/TargetLibraryInfoTest.cpp
index 292b5ca..34b06fe 100644
--- a/llvm/unittests/Analysis/TargetLibraryInfoTest.cpp
+++ b/llvm/unittests/Analysis/TargetLibraryInfoTest.cpp
@@ -621,3 +621,38 @@ TEST_F(TargetLibraryInfoTest, ValidProto) {
     EXPECT_TRUE(isLibFunc(F, LF));
   }
 }
+
+namespace {
+
+/// Creates TLI for AArch64 and uses it to get the LibFunc names for the given
+/// Instruction opcode and Type.
+class TLITestAarch64 : public ::testing::Test {
+private:
+  const Triple TargetTriple;
+
+protected:
+  LLVMContext Ctx;
+  std::unique_ptr<TargetLibraryInfoImpl> TLII;
+  std::unique_ptr<TargetLibraryInfo> TLI;
+
+  /// Create TLI for AArch64
+  TLITestAarch64() : TargetTriple(Triple("aarch64-unknown-linux-gnu")) {
+    TLII = std::make_unique<TargetLibraryInfoImpl>(
+        TargetLibraryInfoImpl(TargetTriple));
+    TLI = std::make_unique<TargetLibraryInfo>(TargetLibraryInfo(*TLII));
+  }
+
+  /// Returns the TLI function name for the given \p Opcode and type \p Ty.
+  StringRef getScalarName(unsigned int Opcode, Type *Ty) {
+    LibFunc Func;
+    if (!TLI->getLibFunc(Opcode, Ty, Func))
+      return "";
+    return TLI->getName(Func);
+  }
+};
+} // end anonymous namespace
+
+TEST_F(TLITestAarch64, TestFrem) {
+  EXPECT_EQ(getScalarName(Instruction::FRem, Type::getDoubleTy(Ctx)), "fmod");
+  EXPECT_EQ(getScalarName(Instruction::FRem, Type::getFloatTy(Ctx)), "fmodf");
+}
\ No newline at end of file