96 bit long double floorl implementation. See sysdeps/libm-ieee754/s_floorl.c for...
authordrepper <drepper>
Wed, 14 Jul 1999 00:13:38 +0000 (00:13 +0000)
committerdrepper <drepper>
Wed, 14 Jul 1999 00:13:38 +0000 (00:13 +0000)
sysdeps/ieee754/ldbl-96/s_floorl.c [new file with mode: 0644]

diff --git a/sysdeps/ieee754/ldbl-96/s_floorl.c b/sysdeps/ieee754/ldbl-96/s_floorl.c
new file mode 100644 (file)
index 0000000..fb0c37e
--- /dev/null
@@ -0,0 +1,90 @@
+/* s_floorl.c -- long double version of s_floor.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
+
+/*
+ * floorl(x)
+ * Return x rounded toward -inf to integral value
+ * Method:
+ *     Bit twiddling.
+ * Exception:
+ *     Inexact flag raised if x not equal to floor(x).
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+static const long double huge = 1.0e4930;
+#else
+static long double huge = 1.0e4930;
+#endif
+
+#ifdef __STDC__
+       long double __floorl(long double x)
+#else
+       long double __floorl(x)
+       long double x;
+#endif
+{
+       int32_t i1,j0;
+       u_int32_t i,j,se,i0,sx;
+       GET_LDOUBLE_WORDS(se,i0,i1,x);
+       sx = (se>>15)&1;
+       j0 = (se&0x7fff)-0x3fff;
+       if(j0<31) {
+           if(j0<0) {  /* raise inexact if x != 0 */
+               if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
+                   if(sx==0) {se=0;i0=i1=0;}
+                   else if(((se&0x7fff)|i0|i1)!=0)
+                       { se=0xbfff;i0=i1=0;}
+               }
+           } else {
+               i = (0x7fffffff)>>j0;
+               if(((i0&i)|i1)==0) return x; /* x is integral */
+               if(huge+x>0.0) {        /* raise inexact flag */
+                   if(sx) {
+                       if (j0>0) i0 += (0x80000000)>>j0;
+                       else ++se;
+                   }
+                   i0 &= (~i); i1=0;
+               }
+           }
+       } else if (j0>62) {
+           if(j0==0x4000) return x+x;  /* inf or NaN */
+           else return x;              /* x is integral */
+       } else {
+           i = ((u_int32_t)(0xffffffff))>>(j0-31);
+           if((i1&i)==0) return x;     /* x is integral */
+           if(huge+x>0.0) {            /* raise inexact flag */
+               if(sx) {
+                   if(j0==31) i0+=1;
+                   else {
+                       j = i1+(1<<(63-j0));
+                       if(j<i1) i0 +=1 ;       /* got a carry */
+                       i1=j;
+                   }
+               }
+               i1 &= (~i);
+           }
+       }
+       SET_LDOUBLE_WORDS(x,se,i0,i1);
+       return x;
+}
+weak_alias (__floorl, floorl)