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/scalbf.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 lib/libc/src/musl-math/scalbf.c (limited to 'lib/libc/src/musl-math/scalbf.c') diff --git a/lib/libc/src/musl-math/scalbf.c b/lib/libc/src/musl-math/scalbf.c new file mode 100644 index 0000000..f44ed5b --- /dev/null +++ b/lib/libc/src/musl-math/scalbf.c @@ -0,0 +1,32 @@ +/* origin: FreeBSD /usr/src/lib/msun/src/e_scalbf.c */ +/* + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#define _GNU_SOURCE +#include + +float scalbf(float x, float fn) +{ + if (isnan(x) || isnan(fn)) return x*fn; + if (!isfinite(fn)) { + if (fn > 0.0f) + return x*fn; + else + return x/(-fn); + } + if (rintf(fn) != fn) return (fn-fn)/(fn-fn); + if ( fn > 65000.0f) return scalbnf(x, 65000); + if (-fn > 65000.0f) return scalbnf(x,-65000); + return scalbnf(x,(int)fn); +} -- cgit v1.2.3