|
@@ -0,0 +1,71 @@
|
|
|
+
|
|
|
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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: s_floorf.c,v 1.4 1995/05/10 20:47:22 jtc Exp $";
|
|
|
+#endif
|
|
|
+
|
|
|
+
|
|
|
+ * floorf(x)
|
|
|
+ * Return x rounded toward -inf to integral value
|
|
|
+ * Method:
|
|
|
+ * Bit twiddling.
|
|
|
+ * Exception:
|
|
|
+ * Inexact flag raised if x not equal to floorf(x).
|
|
|
+ */
|
|
|
+
|
|
|
+#include "math.h"
|
|
|
+#include "math_private.h"
|
|
|
+
|
|
|
+#ifdef __STDC__
|
|
|
+static const float huge = 1.0e30;
|
|
|
+#else
|
|
|
+static float huge = 1.0e30;
|
|
|
+#endif
|
|
|
+
|
|
|
+#ifdef __STDC__
|
|
|
+ float __floorf(float x)
|
|
|
+#else
|
|
|
+ float __floorf(x)
|
|
|
+ float x;
|
|
|
+#endif
|
|
|
+{
|
|
|
+ int32_t i0,j0;
|
|
|
+ u_int32_t i;
|
|
|
+ GET_FLOAT_WORD(i0,x);
|
|
|
+ j0 = ((i0>>23)&0xff)-0x7f;
|
|
|
+ if(j0<23) {
|
|
|
+ if(j0<0) {
|
|
|
+ if(huge+x>(float)0.0) {
|
|
|
+ if(i0>=0) {i0=0;}
|
|
|
+ else if((i0&0x7fffffff)!=0)
|
|
|
+ { i0=0xbf800000;}
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ i = (0x007fffff)>>j0;
|
|
|
+ if((i0&i)==0) return x;
|
|
|
+ if(huge+x>(float)0.0) {
|
|
|
+ if(i0<0) i0 += (0x00800000)>>j0;
|
|
|
+ i0 &= (~i);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ if(j0==0x80) return x+x;
|
|
|
+ else return x;
|
|
|
+ }
|
|
|
+ SET_FLOAT_WORD(x,i0);
|
|
|
+ return x;
|
|
|
+}
|
|
|
+weak_alias (__floorf, floorf)
|