[libc][math] add smoke tests to shared/math.h (#149741)

Adding smoke tests for shared math header.

part of #147386

Author: bassiounix

libc/shared/math/exp10f16.h

@@ -10,10 +10,10 @@
 #define LLVM_LIBC_SHARED_MATH_EXP10F_H
 
 #include "include/llvm-libc-macros/float16-macros.h"
+#include "shared/libc_common.h"
 
 #ifdef LIBC_TYPES_HAS_FLOAT16
 
-#include "shared/libc_common.h"
 #include "src/__support/math/exp10f16.h"
 
 namespace LIBC_NAMESPACE_DECL {

libc/src/__support/math/acos.h

@@ -24,10 +24,10 @@ namespace LIBC_NAMESPACE_DECL {
 
 namespace math {
 
-using DoubleDouble = fputil::DoubleDouble;
-using Float128 = fputil::DyadicFloat<128>;
-
 static constexpr double acos(double x) {
+  using DoubleDouble = fputil::DoubleDouble;
+  using Float128 = fputil::DyadicFloat<128>;
+  using namespace asin_internal;
   using FPBits = fputil::FPBits<double>;
 
   FPBits xbits(x);

libc/src/__support/math/acosf.h

@@ -22,7 +22,10 @@ namespace LIBC_NAMESPACE_DECL {
 
 namespace math {
 
+namespace acosf_internal {
+
 #ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+
 static constexpr size_t N_EXCEPTS = 4;
 
 // Exceptional values when |x| <= 0.5
@@ -37,9 +40,14 @@ static constexpr fputil::ExceptValues<float, N_EXCEPTS> ACOSF_EXCEPTS = {{
     // x = -0x1.04c444p-12, acosf(x) = 0x1.923p0 (RZ)
     {0xb9826222, 0x3fc91800, 1, 0, 1},
 }};
+
 #endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
 
+} // namespace acosf_internal
+
 static constexpr float acosf(float x) {
+  using namespace acosf_internal;
+  using namespace inv_trigf_utils_internal;
   using FPBits = typename fputil::FPBits<float>;
 
   FPBits xbits(x);

libc/src/__support/math/asin_utils.h

@@ -19,7 +19,7 @@
 
 namespace LIBC_NAMESPACE_DECL {
 
-namespace {
+namespace asin_internal {
 
 using DoubleDouble = fputil::DoubleDouble;
 using Float128 = fputil::DyadicFloat<128>;
@@ -567,7 +567,7 @@ LIBC_INLINE static constexpr Float128 asin_eval(const Float128 &u,
 
 #endif // LIBC_MATH_HAS_SKIP_ACCURATE_PASS
 
-} // anonymous namespace
+} // namespace asin_internal
 
 } // namespace LIBC_NAMESPACE_DECL
 

libc/src/__support/math/inv_trigf_utils.h

@@ -16,6 +16,8 @@
 
 namespace LIBC_NAMESPACE_DECL {
 
+namespace inv_trigf_utils_internal {
+
 // PI and PI / 2
 static constexpr double M_MATH_PI = 0x1.921fb54442d18p+1;
 static constexpr double M_MATH_PI_2 = 0x1.921fb54442d18p+0;
@@ -175,6 +177,8 @@ LIBC_INLINE static double asin_eval(double xsq) {
   return fputil::multiply_add(xsq, r2, r1);
 }
 
+} // namespace inv_trigf_utils_internal
+
 } // namespace LIBC_NAMESPACE_DECL
 
 #endif // LLVM_LIBC_SRC___SUPPORT_MATH_INV_TRIGF_UTILS_H

libc/src/math/generic/asin.cpp

@@ -25,6 +25,7 @@ using DoubleDouble = fputil::DoubleDouble;
 using Float128 = fputil::DyadicFloat<128>;
 
 LLVM_LIBC_FUNCTION(double, asin, (double x)) {
+  using namespace asin_internal;
   using FPBits = fputil::FPBits<double>;
 
   FPBits xbits(x);

libc/src/math/generic/asinf.cpp

@@ -44,6 +44,7 @@ static constexpr fputil::ExceptValues<float, N_EXCEPTS> ASINF_EXCEPTS_HI = {{
 #endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
 
 LLVM_LIBC_FUNCTION(float, asinf, (float x)) {
+  using namespace inv_trigf_utils_internal;
   using FPBits = typename fputil::FPBits<float>;
 
   FPBits xbits(x);

libc/src/math/generic/atan2f.cpp

@@ -236,6 +236,7 @@ float atan2f_double_double(double num_d, double den_d, double q_d, int idx,
 // which is about rounding errors of double-double (2^-104).
 
 LLVM_LIBC_FUNCTION(float, atan2f, (float y, float x)) {
+  using namespace inv_trigf_utils_internal;
   using FPBits = typename fputil::FPBits<float>;
   constexpr double IS_NEG[2] = {1.0, -1.0};
   constexpr double PI = 0x1.921fb54442d18p1;

libc/src/math/generic/atanf.cpp

@@ -20,6 +20,7 @@
 namespace LIBC_NAMESPACE_DECL {
 
 LLVM_LIBC_FUNCTION(float, atanf, (float x)) {
+  using namespace inv_trigf_utils_internal;
   using FPBits = typename fputil::FPBits<float>;
 
   constexpr double FINAL_SIGN[2] = {1.0, -1.0};

libc/test/CMakeLists.txt

@@ -20,6 +20,7 @@ endif()
 
 add_subdirectory(src)
 add_subdirectory(utils)
+add_subdirectory(shared)
 
 if(NOT LLVM_LIBC_FULL_BUILD)
   return()