Merge branch 'carg' into mpc_testing_infra

Author: Sh0g0-1758

libc/config/linux/x86_64/entrypoints.txt

@@ -373,6 +373,7 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.complex.cproj
     libc.src.complex.cprojf
     libc.src.complex.cprojl
+    libc.src.complex.cargf
 
     # fenv.h entrypoints
     libc.src.fenv.feclearexcept

libc/src/complex/CMakeLists.txt

@@ -36,3 +36,5 @@ add_complex_entrypoint_object(cprojf)
 add_complex_entrypoint_object(cprojl)
 add_complex_entrypoint_object(cprojf16)
 add_complex_entrypoint_object(cprojf128)
+
+add_complex_entrypoint_object(cargf)

libc/src/complex/cargf.h

@@ -0,0 +1,20 @@
+//===-- Implementation header for cargf -------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_COMPLEX_CARGF_H
+#define LLVM_LIBC_SRC_COMPLEX_CARGF_H
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+float cargf(_Complex float x);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_COMPLEX_CARGF_H

libc/src/complex/generic/CMakeLists.txt

@@ -1,3 +1,16 @@
+add_entrypoint_object(
+  cargf
+  SRCS
+    cargf.cpp
+  HDRS
+    ../cargf.h
+  COMPILE_OPTIONS
+    ${libc_opt_high_flag}
+  DEPENDS
+    libc.src.__support.complex_type
+    libc.src.math.atan2f
+)
+
 add_entrypoint_object(
   cproj
   SRCS

libc/src/complex/generic/cargf.cpp

@@ -0,0 +1,21 @@
+//===-- Implementation of cargf function ----------------------------------===//
+//
+// 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 "src/complex/cargf.h"
+#include "src/__support/common.h"
+#include "src/__support/complex_type.h"
+#include "src/math/atan2f.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(float, cargf, (_Complex float x)) {
+    Complex<float> x_c = cpp::bit_cast<Complex<float>>(x);
+    return atan2f(x_c.imag, x_c.real);
+}
+
+} // namespace LIBC_NAMESPACE_DECL

libc/test/src/complex/CMakeLists.txt

@@ -1,5 +1,17 @@
 add_custom_target(libc-complex-unittests)
 
+add_libc_test(
+  cargf_test
+  SUITE
+    libc-complex-unittests
+  SRCS
+    cargf_test.cpp
+  DEPENDS
+    libc.src.complex.cargf
+  LINK_LIBRARIES
+    LibcFPTestHelpers
+)
+
 add_libc_test(
   conj_test
   SUITE

libc/test/src/complex/CargTest.h

@@ -0,0 +1,35 @@
+//===-- Utility class to test different flavors of carg ---------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TEST_SRC_COMPLEX_CARGTEST_H
+#define LLVM_LIBC_TEST_SRC_COMPLEX_CARGTEST_H
+
+#include "test/UnitTest/FEnvSafeTest.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+#include "hdr/math_macros.h"
+
+template <typename CFPT, typename FPT>
+class CargTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
+
+  DECLARE_SPECIAL_CONSTANTS(FPT)
+
+public:
+  typedef FPT (*CargFunc)(CFPT);
+
+  void testRoundedNumbers(CargFunc func) {
+    EXPECT_FP_EQ((FPT)(1.10714871762320399284), func((CFPT)(1.0 + 2.0i)));
+  }
+};
+
+#define LIST_CARG_TESTS(U, T, func)                                          \
+  using LlvmLibcCargTest = CargTest<U, T>;                                   \
+  TEST_F(LlvmLibcCargTest, RoundedNumbers) { testRoundedNumbers(&func); }
+
+#endif // LLVM_LIBC_TEST_SRC_COMPLEX_CARGTEST_H

libc/test/src/complex/cargf_test.cpp

@@ -0,0 +1,13 @@
+//===-- Unittests for cargf -----------------------------------------------===//
+//
+// 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 "CargTest.h"
+
+#include "src/complex/cargf.h"
+
+LIST_CARG_TESTS(_Complex float, float, LIBC_NAMESPACE::cargf)