Add performance test

Author: overmighty

libc/test/src/math/performance_testing/CMakeLists.txt

@@ -153,6 +153,17 @@ add_perf_binary(
     -fno-builtin
 )
 
+add_perf_binary(
+  exp10f16_perf
+  SRCS
+    exp10f16_perf.cpp
+  DEPENDS
+    .single_input_single_output_diff
+    libc.src.math.exp10f16
+  COMPILE_OPTIONS
+    -fno-builtin
+)
+
 add_perf_binary(
   exp2f_perf
   SRCS

libc/test/src/math/performance_testing/exp10f16_perf.cpp

@@ -0,0 +1,22 @@
+//===-- Performance test for exp10f16 -------------------------------------===//
+//
+// 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 "SingleInputSingleOutputPerf.h"
+
+#include "src/math/exp10f16.h"
+
+// LLVM libc might be the only libc implementation with support for float16 math
+// functions currently. We can't compare our float16 functions against the
+// system libc, so we compare them against this placeholder function.
+static float16 placeholderf16(float16 x) { return x; }
+
+int main() {
+  SINGLE_INPUT_SINGLE_OUTPUT_PERF_EX(float16, LIBC_NAMESPACE::exp10f16,
+                                     ::placeholderf16, 20'000,
+                                     "exp10f16_perf.log")
+}