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/modff.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 lib/libc/src/musl-math/modff.c (limited to 'lib/libc/src/musl-math/modff.c') diff --git a/lib/libc/src/musl-math/modff.c b/lib/libc/src/musl-math/modff.c new file mode 100644 index 0000000..639514e --- /dev/null +++ b/lib/libc/src/musl-math/modff.c @@ -0,0 +1,34 @@ +#include "libm.h" + +float modff(float x, float *iptr) +{ + union {float f; uint32_t i;} u = {x}; + uint32_t mask; + int e = (int)(u.i>>23 & 0xff) - 0x7f; + + /* no fractional part */ + if (e >= 23) { + *iptr = x; + if (e == 0x80 && u.i<<9 != 0) { /* nan */ + return x; + } + u.i &= 0x80000000; + return u.f; + } + /* no integral part */ + if (e < 0) { + u.i &= 0x80000000; + *iptr = u.f; + return x; + } + + mask = 0x007fffff>>e; + if ((u.i & mask) == 0) { + *iptr = x; + u.i &= 0x80000000; + return u.f; + } + u.i &= ~mask; + *iptr = u.f; + return x - u.f; +} -- cgit v1.2.3