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fix(libc): match FreeBSD asinf errno 

asinf returned 0xffc00000 (errno 33) for 2.0 (0x40000000), where FreeBSD
lib/msun/src/math.h returns 0xffc00000 (errno 0).

It now returns the FreeBSD result for that case. A guest test covers it
and fails on main.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
This commit is contained in:
Alex 2026-10-11 11:22:51 -04:00
parent a11c8f7f70
commit 1a6f6a9f13
2 changed files with 13 additions and 1 deletions
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7
core/libs/prx/libc/src/Math.cpp
View File

@ -36,7 +36,12 @@ std::lldiv_t APS5_VABI ldiv_nid_postfix(std::int64_t numerator, std::int64_t den
}
float APS5_VABI fmodf_nid_postfix(float x, float y) { return std::fmod(x, y); }
float APS5_VABI asinf_nid_postfix(float x) { return std::asin(x); }
float APS5_VABI asinf_nid_postfix(float x) {
const int saved_errno = errno;
const float result = std::asin(x);
errno = saved_errno;
return result;
}
float APS5_VABI acosf_nid_postfix(float x) { return std::acos(x); }
float APS5_VABI atan2f_nid_postfix(float y, float x) { return std::atan2(y, x); }
float APS5_VABI hypotf_nid_postfix(float x, float y) { return static_cast<float>(std::hypot(static_cast<double>(x), static_cast<double>(y))); }

7
core/libs/tests/GuestMath.cpp
View File

@ -128,6 +128,12 @@ static void CheckHypotSpecialValue() {
Require(std::bit_cast<std::uint64_t>(hypot_nid_postfix(std::bit_cast<double>(0x7ff0000000000001ull), -INFINITY)) == 0x7ff0000000000000ull);
}
static void CheckAsinfErrno() {
errno = 0;
(void)asinf_nid_postfix(2.0f);
Require(errno == 0);
}
static void CheckLongDouble() {
Require(ExtendedBits(acosl_nid_postfix(-1.0L), 0xc90fdaa22168c235ull, 0x4000));
Require(ExtendedBits(acosl_nid_postfix(0.0L), 0xc90fdaa22168c235ull, 0x3fff));
@ -479,6 +485,7 @@ int main() {
Require(__isnormal_nid_postfix(1.) == 1 && __isnormal_nid_postfix(0.) == 0);
Require(__isnormal_nid_postfix(std::numeric_limits<double>::denorm_min()) == 0);
const auto quotient = div_nid_postfix(7, 2);
CheckAsinfErrno();
Require(quotient.quot == 3 && quotient.rem == 1);
const auto negativeNumerator = div_nid_postfix(-7, 2);
Require(negativeNumerator.quot == -3 && negativeNumerator.rem == -1);