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/truncl.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 lib/libc/src/musl-math/truncl.c (limited to 'lib/libc/src/musl-math/truncl.c') diff --git a/lib/libc/src/musl-math/truncl.c b/lib/libc/src/musl-math/truncl.c new file mode 100644 index 0000000..f07b193 --- /dev/null +++ b/lib/libc/src/musl-math/truncl.c @@ -0,0 +1,34 @@ +#include "libm.h" + +#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 +long double truncl(long double x) +{ + return trunc(x); +} +#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384 + +static const long double toint = 1/LDBL_EPSILON; + +long double truncl(long double x) +{ + union ldshape u = {x}; + int e = u.i.se & 0x7fff; + int s = u.i.se >> 15; + long double y; + + if (e >= 0x3fff+LDBL_MANT_DIG-1) + return x; + if (e <= 0x3fff-1) { + FORCE_EVAL(x + 0x1p120f); + return x*0; + } + /* y = int(|x|) - |x|, where int(|x|) is an integer neighbor of |x| */ + if (s) + x = -x; + y = x + toint - toint - x; + if (y > 0) + y -= 1; + x += y; + return s ? -x : x; +} +#endif -- cgit v1.2.3