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float.rounds_to_nearest

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This commit is contained in:
Anders Dalvander 2024-12-02 16:30:37 +01:00
parent b3acae22ea
commit c62b853648
1 changed files with 9 additions and 9 deletions
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18
tests/basictest.cpp
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@ -127,32 +127,32 @@ TEST_CASE("system_info") {
std::cout << std::endl; std::cout << std::endl;
} }
TEST_CASE("rounds_to_nearest") { TEST_CASE("float.rounds_to_nearest") {
// //
// If this function fails, we may be left in a non-standard rounding state. // If this function fails, we may be left in a non-standard rounding state.
// //
static float volatile fmin = std::numeric_limits<float>::min(); static float volatile fmin = std::numeric_limits<float>::min();
fesetround(FE_UPWARD); fesetround(FE_UPWARD);
std::cout << "FE_UPWARD: fmin + 1.0f = " << iHexAndDec(fmin + 1.0f) std::cout << "FE_UPWARD: fmin + 1.0f = " << fHexAndDec(fmin + 1.0f)
<< " 1.0f - fmin = " << iHexAndDec(1.0f - fmin) << std::endl; << " 1.0f - fmin = " << fHexAndDec(1.0f - fmin) << std::endl;
CHECK(fegetround() == FE_UPWARD); CHECK(fegetround() == FE_UPWARD);
CHECK(fast_float::detail::rounds_to_nearest() == false); CHECK(fast_float::detail::rounds_to_nearest() == false);
fesetround(FE_DOWNWARD); fesetround(FE_DOWNWARD);
std::cout << "FE_DOWNWARD: fmin + 1.0f = " << iHexAndDec(fmin + 1.0f) std::cout << "FE_DOWNWARD: fmin + 1.0f = " << fHexAndDec(fmin + 1.0f)
<< " 1.0f - fmin = " << iHexAndDec(1.0f - fmin) << std::endl; << " 1.0f - fmin = " << fHexAndDec(1.0f - fmin) << std::endl;
CHECK(fegetround() == FE_DOWNWARD); CHECK(fegetround() == FE_DOWNWARD);
CHECK(fast_float::detail::rounds_to_nearest() == false); CHECK(fast_float::detail::rounds_to_nearest() == false);
fesetround(FE_TOWARDZERO); fesetround(FE_TOWARDZERO);
std::cout << "FE_TOWARDZERO: fmin + 1.0f = " << iHexAndDec(fmin + 1.0f) std::cout << "FE_TOWARDZERO: fmin + 1.0f = " << fHexAndDec(fmin + 1.0f)
<< " 1.0f - fmin = " << iHexAndDec(1.0f - fmin) << std::endl; << " 1.0f - fmin = " << fHexAndDec(1.0f - fmin) << std::endl;
CHECK(fegetround() == FE_TOWARDZERO); CHECK(fegetround() == FE_TOWARDZERO);
CHECK(fast_float::detail::rounds_to_nearest() == false); CHECK(fast_float::detail::rounds_to_nearest() == false);
fesetround(FE_TONEAREST); fesetround(FE_TONEAREST);
std::cout << "FE_TONEAREST: fmin + 1.0f = " << iHexAndDec(fmin + 1.0f) std::cout << "FE_TONEAREST: fmin + 1.0f = " << fHexAndDec(fmin + 1.0f)
<< " 1.0f - fmin = " << iHexAndDec(1.0f - fmin) << std::endl; << " 1.0f - fmin = " << fHexAndDec(1.0f - fmin) << std::endl;
CHECK(fegetround() == FE_TONEAREST); CHECK(fegetround() == FE_TONEAREST);
#if (FLT_EVAL_METHOD == 1) || (FLT_EVAL_METHOD == 0) #if (FLT_EVAL_METHOD == 1) || (FLT_EVAL_METHOD == 0)
CHECK(fast_float::detail::rounds_to_nearest() == true); CHECK(fast_float::detail::rounds_to_nearest() == true);