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feat(libc): implement nearbyint 

The float helper is already on main. The double helper rounds with the current mode and does not raise the inexact flag.
This commit is contained in:
ivica00 2026-10-12 22:51:11 +02:00
parent 7940cacd83
commit 5883c25552
2 changed files with 16 additions and 0 deletions
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1
core/libs/prx/libc/src/Math.cpp
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@ -183,6 +183,7 @@ int APS5_VABI __isnormalf_nid_postfix(float x) { return std::isnormal(x) ? 1 : 0
int APS5_VABI __isinff_nid_postfix(float x) { return std::isinf(x) ? 1 : 0; }
float APS5_VABI nearbyintf_nid_postfix(float x) { return std::nearbyintf(x); }
long double APS5_VABI nearbyintl_nid_postfix(long double x) { return std::nearbyint(x); }
double APS5_VABI nearbyint_nid_postfix(double x) { return std::nearbyint(x); }
double APS5_VABI cbrt_nid_postfix(double x) { return std::cbrt(x); }
double APS5_VABI asin_nid_postfix(double x) {

15
core/libs/tests/GuestMath.cpp
View File

@ -34,6 +34,7 @@ double APS5_VABI fabs_nid_postfix(double);
int APS5_VABI abs_nid_postfix(int);
double APS5_VABI trunc_nid_postfix(double);
double APS5_VABI ceil_nid_postfix(double);
double APS5_VABI nearbyint_nid_postfix(double);
double APS5_VABI fma_nid_postfix(double, double, double);
long double APS5_VABI acosl_nid_postfix(long double);
long double APS5_VABI asinl_nid_postfix(long double);
@ -152,6 +153,19 @@ static void CheckExactOperations() {
Require(std::isnan(fma_nid_postfix(INFINITY, 0., 1.)));
}
static void CheckNearbyint() {
std::feclearexcept(FE_ALL_EXCEPT);
const double zero = nearbyint_nid_postfix(0.5);
Require(zero == 0.0 && !std::signbit(zero));
Require(nearbyint_nid_postfix(1.5) == 2.0 && nearbyint_nid_postfix(2.5) == 2.0);
Require(nearbyint_nid_postfix(2.7) == 3.0 && nearbyint_nid_postfix(-2.7) == -3.0);
Require(std::bit_cast<std::uint64_t>(nearbyint_nid_postfix(-0.5)) == 0x8000000000000000ull);
Require(nearbyint_nid_postfix(0x1p53) == 0x1p53);
Require(nearbyint_nid_postfix(INFINITY) == INFINITY && nearbyint_nid_postfix(-INFINITY) == -INFINITY);
Require(std::isnan(nearbyint_nid_postfix(NAN)));
Require(std::fetestexcept(FE_INEXACT) == 0);
}
static bool ExtendedBits(long double value, std::uint64_t mantissa, std::uint16_t signExponent) {
unsigned char bytes[sizeof(long double)]{};
std::memcpy(bytes, &value, sizeof(value));
@ -709,6 +723,7 @@ int main() {
CheckSquareRoot();
CheckExp2Errno();
CheckExactOperations();
CheckNearbyint();
CheckLongDouble();
CheckNearbyintl();
CheckAsinl();