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Diffstat (limited to 'sysdeps/ieee754/ldbl-96/s_ilogbl.c')
-rw-r--r--sysdeps/ieee754/ldbl-96/s_ilogbl.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-96/s_ilogbl.c b/sysdeps/ieee754/ldbl-96/s_ilogbl.c
new file mode 100644
index 0000000000..d44229dcda
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-96/s_ilogbl.c
@@ -0,0 +1,56 @@
+/* s_ilogbl.c -- long double version of s_ilogb.c.
+ * Conversion to long double by Ulrich Drepper,
+ * Cygnus Support, drepper@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.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: $";
+#endif
+
+/* ilogbl(long double x)
+ * return the binary exponent of non-zero x
+ * ilogbl(0) = 0x80000001
+ * ilogbl(inf/NaN) = 0x7fffffff (no signal is raised)
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+ int __ilogbl(long double x)
+#else
+ int __ilogbl(x)
+ long double x;
+#endif
+{
+ int32_t es,hx,lx,ix;
+
+ GET_LDOUBLE_EXP(es,x);
+ es &= 0x7fff;
+ if(es==0) {
+ GET_LDOUBLE_WORDS(es,hx,lx,x);
+ if((hx|lx)==0)
+ return FP_ILOGB0; /* ilogbl(0) = FP_ILOGB0 */
+ else /* subnormal x */
+ if(hx==0) {
+ for (ix = -16415; lx>0; lx<<=1) ix -=1;
+ } else {
+ for (ix = -16383; hx>0; hx<<=1) ix -=1;
+ }
+ return ix;
+ }
+ else if (es<0x7fff) return es-0x3fff;
+ else return FP_ILOGBNAN;
+}
+weak_alias (__ilogbl, ilogbl)