fixup! [libc][math][c23] Add f16subf C23 math function

Author: overmighty

libc/test/src/math/SubTest.h

@@ -36,9 +36,10 @@ class SubTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
       InFPBits::min_subnormal().uintval();
 
 public:
-  typedef OutType (*AddFunc)(InType, InType);
+  using SubFunc = OutType (*)(InType, InType);
 
-  void test_subnormal_range(AddFunc func) {
+  void test_subnormal_range(SubFunc func) {
+    constexpr InStorageType COUNT = 100'001;
     constexpr InStorageType STEP =
         (IN_MAX_SUBNORMAL_U - IN_MIN_SUBNORMAL_U) / COUNT;
     for (InStorageType i = 0, v = 0, w = IN_MAX_SUBNORMAL_U; i <= COUNT;
@@ -51,7 +52,7 @@ class SubTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
     }
   }
 
-  void test_normal_range(AddFunc func) {
+  void test_normal_range(SubFunc func) {
     constexpr InStorageType COUNT = 100'001;
     constexpr InStorageType STEP = (IN_MAX_NORMAL_U - IN_MIN_NORMAL_U) / COUNT;
     for (InStorageType i = 0, v = 0, w = IN_MAX_NORMAL_U; i <= COUNT;
@@ -70,4 +71,4 @@ class SubTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   TEST_F(LlvmLibcSubTest, SubnormalRange) { test_subnormal_range(&func); }     \
   TEST_F(LlvmLibcSubTest, NormalRange) { test_normal_range(&func); }
 
-#endif // LLVM_LIBC_TEST_SRC_MATH_ADDTEST_H
+#endif // LLVM_LIBC_TEST_SRC_MATH_SUBTEST_H

libc/test/src/math/smoke/SubTest.h

@@ -155,4 +155,4 @@ class SubTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   TEST_F(LlvmLibcSubTest, RangeErrors) { test_range_errors(&func); }           \
   TEST_F(LlvmLibcSubTest, InexactResults) { test_inexact_results(&func); }
 
-#endif // LLVM_LIBC_TEST_SRC_MATH_SMOKE_ADDTEST_H
+#endif // LLVM_LIBC_TEST_SRC_MATH_SMOKE_SUBTEST_H