From 30634165980deaeead9f4e71e0ff6a5c9d897776 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Mon, 14 Jul 2025 22:39:34 -0400 Subject: usr: libc: Add math.h + musl math impl port Signed-off-by: Ian Moffett --- lib/libc/src/musl-math/lrintl.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 lib/libc/src/musl-math/lrintl.c (limited to 'lib/libc/src/musl-math/lrintl.c') diff --git a/lib/libc/src/musl-math/lrintl.c b/lib/libc/src/musl-math/lrintl.c new file mode 100644 index 0000000..b2a8106 --- /dev/null +++ b/lib/libc/src/musl-math/lrintl.c @@ -0,0 +1,36 @@ +#include +#include +#include "libm.h" + + +#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 +long lrintl(long double x) +{ + return lrint(x); +} +#elif defined(FE_INEXACT) +/* +see comments in lrint.c + +Note that if LONG_MAX == 0x7fffffffffffffff && LDBL_MANT_DIG == 64 +then x == 2**63 - 0.5 is the only input that overflows and +raises inexact (with tonearest or upward rounding mode) +*/ +long lrintl(long double x) +{ + #pragma STDC FENV_ACCESS ON + int e; + + e = fetestexcept(FE_INEXACT); + x = rintl(x); + if (!e && (x > LONG_MAX || x < LONG_MIN)) + feclearexcept(FE_INEXACT); + /* conversion */ + return x; +} +#else +long lrintl(long double x) +{ + return rintl(x); +} +#endif -- cgit v1.2.3