From 7450f4f2bd19b1c6de0218a44aaba53639985768 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/scalbnf.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 lib/libc/src/musl-math/scalbnf.c (limited to 'lib/libc/src/musl-math/scalbnf.c') diff --git a/lib/libc/src/musl-math/scalbnf.c b/lib/libc/src/musl-math/scalbnf.c new file mode 100644 index 0000000..a5ad208 --- /dev/null +++ b/lib/libc/src/musl-math/scalbnf.c @@ -0,0 +1,31 @@ +#include +#include + +float scalbnf(float x, int n) +{ + union {float f; uint32_t i;} u; + float_t y = x; + + if (n > 127) { + y *= 0x1p127f; + n -= 127; + if (n > 127) { + y *= 0x1p127f; + n -= 127; + if (n > 127) + n = 127; + } + } else if (n < -126) { + y *= 0x1p-126f * 0x1p24f; + n += 126 - 24; + if (n < -126) { + y *= 0x1p-126f * 0x1p24f; + n += 126 - 24; + if (n < -126) + n = -126; + } + } + u.i = (uint32_t)(0x7f+n)<<23; + x = y * u.f; + return x; +} -- cgit v1.2.3