From 382cd8fc4f16f1d24f71798a14da3244f837ae22 Mon Sep 17 00:00:00 2001
From: ckormanyos <ckormanyos@yahoo.com>
Date: Tue, 14 Jan 2025 20:04:31 +0100
Subject: [PATCH] More tests and minor corrections

---
 .../boost/multiprecision/cpp_double_fp.hpp    | 19 ++--
 test/test_various_edges.cpp                   | 89 ++++++++++++++++---
 2 files changed, 90 insertions(+), 18 deletions(-)

diff --git a/include/boost/multiprecision/cpp_double_fp.hpp b/include/boost/multiprecision/cpp_double_fp.hpp
index e120def03..db6b2237c 100644
--- a/include/boost/multiprecision/cpp_double_fp.hpp
+++ b/include/boost/multiprecision/cpp_double_fp.hpp
@@ -2030,14 +2030,18 @@ constexpr void eval_convert_to(int128_type* result, const cpp_double_fp_backend<
 
    using c_type = typename std::common_type<int128_type, FloatingPointType>::type;
 
-   constexpr c_type my_max = static_cast<c_type>(my_max_val);
-   const     c_type ct     = cpp_df_qf_detail::ccmath::fabs(backend.crep().first);
+   constexpr c_type my_max { static_cast<c_type>(my_max_val) };
+   constexpr c_type my_min { static_cast<c_type>(my_min_val) };
+
+   const c_type ct { static_cast<c_type>(backend.crep().first) };
 
    if (ct > my_max)
    {
-      *result = backend.crep().first >= typename cpp_double_fp_backend<FloatingPointType>::float_type(0U)
-         ? my_max_val
-         : my_min_val;
+      *result = my_max_val;
+   }
+   if (ct < my_min)
+   {
+      *result = my_min_val;
    }
    else
    {
@@ -2091,8 +2095,9 @@ constexpr void eval_convert_to(uint128_type* result, const cpp_double_fp_backend
 
    using c_type = typename std::common_type<uint128_type, FloatingPointType>::type;
 
-   const c_type my_max = static_cast<c_type>(my_max_val);
-   const c_type ct     = cpp_df_qf_detail::ccmath::fabs(backend.crep().first);
+   constexpr c_type my_max { static_cast<c_type>(my_max_val) };
+
+   const c_type ct { static_cast<c_type>(backend.crep().first) };
 
    if (ct > my_max)
    {
diff --git a/test/test_various_edges.cpp b/test/test_various_edges.cpp
index 5617605c8..97d256673 100644
--- a/test/test_various_edges.cpp
+++ b/test/test_various_edges.cpp
@@ -85,9 +85,7 @@ namespace local
     using float_type = FloatType;
     using ctrl_type  = boost::multiprecision::number<boost::multiprecision::cpp_dec_float<100>, boost::multiprecision::et_off>;
 
-    std::mt19937_64 gen;
-
-    gen.seed(time_point<typename std::mt19937_64::result_type>());
+    std::mt19937_64 gen { time_point<typename std::mt19937_64::result_type>() };
 
     auto dis =
       std::uniform_real_distribution<float>
@@ -285,6 +283,77 @@ namespace local
       BOOST_TEST(result_is_ok = ((conversion_result_min == (std::numeric_limits<signed long long>::min)()) && result_is_ok));
     }
 
+    {
+      for(auto i = static_cast<unsigned>(UINT8_C(0)); i < static_cast<unsigned>(UINT8_C(16)); ++i)
+      {
+        static_cast<void>(i);
+
+        const float_type flt_factor_inf_pos { std::numeric_limits<float_type>::infinity() * dis(gen) };
+        const float_type flt_factor_inf_neg { std::numeric_limits<float_type>::infinity() * -dis(gen) };
+
+        {
+          const float_type val_inf_pos_neg_add { flt_factor_inf_pos + flt_factor_inf_neg };
+
+          const bool result_inf_pos_neg_add_is_ok { isnan(val_inf_pos_neg_add) };
+
+          BOOST_TEST(result_inf_pos_neg_add_is_ok);
+
+          result_is_ok = (result_inf_pos_neg_add_is_ok && result_is_ok);
+        }
+
+        {
+          const float_type val_inf_pos_pos_add { flt_factor_inf_pos + -flt_factor_inf_neg };
+
+          const bool result_inf_pos_pos_add_is_ok { isinf(val_inf_pos_pos_add) };
+
+          BOOST_TEST(result_inf_pos_pos_add_is_ok);
+
+          result_is_ok = (result_inf_pos_pos_add_is_ok && result_is_ok);
+        }
+
+        {
+          const float_type val_inf_neg_neg_add { -flt_factor_inf_pos + (flt_factor_inf_neg) };
+
+          const bool result_inf_neg_neg_add_is_ok { isinf(val_inf_neg_neg_add) && signbit(val_inf_neg_neg_add) };
+
+          BOOST_TEST(result_inf_neg_neg_add_is_ok);
+
+          result_is_ok = (result_inf_neg_neg_add_is_ok && result_is_ok);
+        }
+
+        {
+          const float_type val_inf_pos_neg_sub { flt_factor_inf_pos - flt_factor_inf_neg };
+
+          const bool result_inf_pos_neg_sub_is_ok { isinf(val_inf_pos_neg_sub) };
+
+          BOOST_TEST(result_inf_pos_neg_sub_is_ok);
+
+          result_is_ok = (result_inf_pos_neg_sub_is_ok && result_is_ok);
+        }
+
+        {
+          const float_type val_inf_pos_pos_sub { flt_factor_inf_pos - (-flt_factor_inf_neg) };
+
+          const bool result_inf_pos_pos_sub_is_ok { isnan(val_inf_pos_pos_sub) };
+
+          BOOST_TEST(result_inf_pos_pos_sub_is_ok);
+
+          result_is_ok = (result_inf_pos_pos_sub_is_ok && result_is_ok);
+        }
+
+        {
+          const float_type val_inf_neg_neg_sub { -flt_factor_inf_pos - (flt_factor_inf_neg) };
+
+          const bool result_inf_neg_neg_sub_is_ok { isnan(val_inf_neg_neg_sub) };
+
+          BOOST_TEST(result_inf_neg_neg_sub_is_ok);
+
+          result_is_ok = (result_inf_neg_neg_sub_is_ok && result_is_ok);
+        }
+
+      }
+    }
+
     return result_is_ok;
   }
 
@@ -293,9 +362,7 @@ namespace local
   {
     using float_type = FloatType;
 
-    std::mt19937_64 gen;
-
-    gen.seed(time_point<typename std::mt19937_64::result_type>());
+    std::mt19937_64 gen { time_point<typename std::mt19937_64::result_type>() };
 
     auto dis =
       std::uniform_real_distribution<float>
@@ -325,9 +392,7 @@ namespace local
   {
     using float_type = FloatType;
 
-    std::mt19937_64 gen;
-
-    gen.seed(time_point<typename std::mt19937_64::result_type>());
+    std::mt19937_64 gen { time_point<typename std::mt19937_64::result_type>() };
 
     std::uniform_real_distribution<float>
       dist
@@ -723,11 +788,13 @@ namespace local
     {
       static_cast<void>(index);
 
-      float_type arg_one_minus =
+      float_type arg_one_minus
+      {
         static_cast<float_type>
         (
           -static_cast<int>(::my_one<float_type>() * static_cast<float_type>(dist(gen)))
-        );
+        )
+      };
 
       const auto log_one_minus = log(arg_one_minus);