Meta: Add OpenLibm

src/openlibm/ld80/s_floorl.c

@@ -0,0 +1,80 @@
+/* @(#)s_floor.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+/*
+ * 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 <openlibm_math.h>
+
+#include "math_private.h"
+
+static const long double huge = 1.0e4930L;
+
+long double
+floorl(long double x)
+{
+	int32_t i1,jj0;
+	u_int32_t i,j,se,i0,sx;
+	GET_LDOUBLE_WORDS(se,i0,i1,x);
+	sx = (se>>15)&1;
+	jj0 = (se&0x7fff)-0x3fff;
+	if(jj0<31) {
+	    if(jj0<0) {	/* raise inexact if x != 0 */
+		if(huge+x>0.0) {
+		    if(sx==0)
+			return 0.0L;
+		    else if(((se&0x7fff)|i0|i1)!=0)
+			return -1.0L;
+		}
+	    } else {
+		i = (0x7fffffff)>>jj0;
+		if(((i0&i)|i1)==0) return x; /* x is integral */
+		if(huge+x>0.0) {	/* raise inexact flag */
+		    if(sx) {
+			if (jj0>0 && (i0+(0x80000000>>jj0))>i0)
+			  i0 += (0x80000000)>>jj0;
+			else
+			  {
+			    i = 0x7fffffff;
+			    ++se;
+			  }
+		    }
+		    i0 &= (~i); i1=0;
+		}
+	    }
+	} else if (jj0>62) {
+	    if(jj0==0x4000) return x+x;	/* inf or NaN */
+	    else return x;		/* x is integral */
+	} else {
+	    i = ((u_int32_t)(0xffffffff))>>(jj0-31);
+	    if((i1&i)==0) return x;	/* x is integral */
+	    if(huge+x>0.0) {		/* raise inexact flag */
+		if(sx) {
+		    if(jj0==31) i0+=1;
+		    else {
+			j = i1+(1<<(63-jj0));
+			if(j<i1) i0 +=1 ;	/* got a carry */
+			i1=j;
+		    }
+		}
+		i1 &= (~i);
+	    }
+	}
+	SET_LDOUBLE_WORDS(x,se,i0,i1);
+	return x;
+}