fixed float16 cast, nit formatting

Author: wldfngrs

libc/src/math/generic/CMakeLists.txt

@@ -541,6 +541,7 @@ add_entrypoint_object(
     libc.src.__support.FPUtil.multiply_add
     libc.src.__support.FPUtil.nearest_integer
     libc.src.__support.FPUtil.polyeval
+    libc.src.__support.FPUtil.cast
     libc.src.__support.macros.properties.types
   COMPILE_OPTIONS
     -O3

libc/src/math/generic/sinpif16.cpp

@@ -10,6 +10,7 @@
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/PolyEval.h"
+#include "src/__support/FPUtil/cast.h"
 #include "src/__support/FPUtil/multiply_add.h"
 #include "src/__support/FPUtil/nearest_integer.h"
 #include "src/__support/common.h"
@@ -129,7 +130,7 @@ LLVM_LIBC_FUNCTION(float16, sinpif16, (float16 x)) {
 
   // Since, cosm1_y = cos_y - 1, therefore:
   // 	sin(x * pi) = cos_k * sin_y + sin_k + (cosm1_y * sin_k)
-  return static_cast<float16>(fputil::multiply_add(
+  return fputil::cast<float16>(fputil::multiply_add(
       sin_y, cos_k, fputil::multiply_add(cosm1_y, sin_k, sin_k)));
 }
 } // namespace LIBC_NAMESPACE_DECL

libc/test/src/math/sinpif16_test.cpp

@@ -4,7 +4,7 @@
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
-//===--------------------------------------------------------------------- ===//
+//===---------------------------------------------------------------------===//
 
 #include "src/math/sinpif16.h"
 #include "test/UnitTest/FPMatcher.h"

libc/test/src/math/smoke/sinpif16_test.cpp

@@ -4,7 +4,7 @@
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
-// ===----------------------------------------------------------------------==//
+//===----------------------------------------------------------------------===//
 
 #include "src/errno/libc_errno.h"
 #include "src/math/sinpif16.h"
@@ -19,10 +19,10 @@ TEST_F(LlvmLibcSinpif16Test, SpecialNumbers) {
   EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpif16(aNaN));
   EXPECT_MATH_ERRNO(0);
 
-  EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpif16(0.0f));
+  EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpif16(zero));
   EXPECT_MATH_ERRNO(0);
 
-  EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpif16(-0.0f));
+  EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpif16(neg_zero));
   EXPECT_MATH_ERRNO(0);
 
   EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpif16(inf));