/* Primitive operations on floating point for GNU Emacs Lisp interpreter.
- Copyright (C) 1988, 1993 Free Software Foundation, Inc.
+ Copyright (C) 1988, 1993, 1994 Free Software Foundation, Inc.
This file is part of GNU Emacs.
#ifdef LISP_FLOAT_TYPE
+#ifdef MSDOS
+/* These are redefined (correctly, but differently) in values.h. */
+#undef INTBITS
+#undef LONGBITS
+#undef SHORTBITS
+#endif
+
+/* Work around a problem that happens because math.h on hpux 7
+ defines two static variables--which, in Emacs, are not really static,
+ because `static' is defined as nothing. The problem is that they are
+ defined both here and in lread.c.
+ These macros prevent the name conflict. */
+#if defined (HPUX) && !defined (HPUX8)
+#define _MAXLDBL floatfns_maxldbl
+#define _NMAXLDBL floatfns_nmaxldbl
+#endif
+
#include <math.h>
-#ifndef hpux
-/* These declarations are omitted on some systems, like Ultrix. */
+/* This declaration is omitted on some systems, like Ultrix. */
+#if !defined (HPUX) && defined (HAVE_LOGB) && !defined (logb)
extern double logb ();
-#endif
+#endif /* not HPUX and HAVE_LOGB and no logb macro */
#if defined(DOMAIN) && defined(SING) && defined(OVERFLOW)
/* If those are defined, then this is probably a `matherr' machine. */
#define IN_FLOAT2(d, name, num, num2) (in_float = 1, (d), in_float = 0)
#endif
+/* Convert float to Lisp_Int if it fits, else signal a range error
+ using the given arguments. */
+#define FLOAT_TO_INT(x, i, name, num) \
+ do \
+ { \
+ if ((x) >= (1 << (VALBITS-1)) || (x) <= - (1 << (VALBITS-1)) - 1) \
+ range_error (name, num); \
+ XSET (i, Lisp_Int, (int)(x)); \
+ } \
+ while (0)
+#define FLOAT_TO_INT2(x, i, name, num1, num2) \
+ do \
+ { \
+ if ((x) >= (1 << (VALBITS-1)) || (x) <= - (1 << (VALBITS-1)) - 1) \
+ range_error2 (name, num1, num2); \
+ XSET (i, Lisp_Int, (int)(x)); \
+ } \
+ while (0)
+
#define arith_error(op,arg) \
Fsignal (Qarith_error, Fcons (build_string ((op)), Fcons ((arg), Qnil)))
#define range_error(op,arg) \
Fsignal (Qrange_error, Fcons (build_string ((op)), Fcons ((arg), Qnil)))
+#define range_error2(op,a1,a2) \
+ Fsignal (Qrange_error, Fcons (build_string ((op)), \
+ Fcons ((a1), Fcons ((a2), Qnil))))
#define domain_error(op,arg) \
Fsignal (Qdomain_error, Fcons (build_string ((op)), Fcons ((arg), Qnil)))
#define domain_error2(op,a1,a2) \
- Fsignal (Qdomain_error, Fcons (build_string ((op)), Fcons ((a1), Fcons ((a2), Qnil))))
+ Fsignal (Qdomain_error, Fcons (build_string ((op)), \
+ Fcons ((a1), Fcons ((a2), Qnil))))
/* Extract a Lisp number as a `double', or signal an error. */
}
else
{
- for (; y > 0; y--)
while (y > 0)
{
if (y & 1)
int value;
double f = extract_float (arg);
+ if (f == 0.0)
+ value = -(VALMASK >> 1);
+ else
+ {
#ifdef HAVE_LOGB
- IN_FLOAT (value = logb (f), "logb", arg);
- XSET (val, Lisp_Int, value);
+ IN_FLOAT (value = logb (f), "logb", arg);
#else
#ifdef HAVE_FREXP
- {
- int exp;
-
- IN_FLOAT (frexp (f, &exp), "logb", arg);
- XSET (val, Lisp_Int, exp-1);
- }
+ IN_FLOAT (frexp (f, &value), "logb", arg);
+ value--;
#else
- /* Would someone like to write code to emulate logb? */
- error ("`logb' not implemented on this operating system");
+ int i;
+ double d;
+ if (f < 0.0)
+ f = -f;
+ value = -1;
+ while (f < 0.5)
+ {
+ for (i = 1, d = 0.5; d * d >= f; i += i)
+ d *= d;
+ f /= d;
+ value -= i;
+ }
+ while (f >= 1.0)
+ {
+ for (i = 1, d = 2.0; d * d <= f; i += i)
+ d *= d;
+ f /= d;
+ value += i;
+ }
#endif
#endif
-
+ }
+ XSET (val, Lisp_Int, value);
return val;
}
CHECK_NUMBER_OR_FLOAT (arg, 0);
if (XTYPE (arg) == Lisp_Float)
- IN_FLOAT (XSET (arg, Lisp_Int, ceil (XFLOAT (arg)->data)), "ceiling", arg);
+ {
+ double d;
+
+ IN_FLOAT (d = ceil (XFLOAT (arg)->data), "ceiling", arg);
+ FLOAT_TO_INT (d, arg, "ceiling", arg);
+ }
return arg;
}
if (f2 == 0)
Fsignal (Qarith_error, Qnil);
- IN_FLOAT2 (XSET (arg, Lisp_Int, floor (f1 / f2)),
- "floor", arg, divisor);
+ IN_FLOAT2 (f1 = floor (f1 / f2), "floor", arg, divisor);
+ FLOAT_TO_INT2 (f1, arg, "floor", arg, divisor);
return arg;
}
#endif
#ifdef LISP_FLOAT_TYPE
if (XTYPE (arg) == Lisp_Float)
- IN_FLOAT (XSET (arg, Lisp_Int, floor (XFLOAT (arg)->data)), "floor", arg);
+ {
+ double d;
+ IN_FLOAT (d = floor (XFLOAT (arg)->data), "floor", arg);
+ FLOAT_TO_INT (d, arg, "floor", arg);
+ }
#endif
return arg;
CHECK_NUMBER_OR_FLOAT (arg, 0);
if (XTYPE (arg) == Lisp_Float)
- /* Screw the prevailing rounding mode. */
- IN_FLOAT (XSET (arg, Lisp_Int, rint (XFLOAT (arg)->data)), "round", arg);
+ {
+ double d;
+
+ /* Screw the prevailing rounding mode. */
+ IN_FLOAT (d = rint (XFLOAT (arg)->data), "round", arg);
+ FLOAT_TO_INT (d, arg, "round", arg);
+ }
return arg;
}
CHECK_NUMBER_OR_FLOAT (arg, 0);
if (XTYPE (arg) == Lisp_Float)
- XSET (arg, Lisp_Int, (int) XFLOAT (arg)->data);
+ {
+ double d;
+
+ d = XFLOAT (arg)->data;
+ FLOAT_TO_INT (d, arg, "truncate", arg);
+ }
return arg;
}
\f
-#if 0
/* It's not clear these are worth adding. */
DEFUN ("fceiling", Ffceiling, Sfceiling, 1, 1, 0,
register Lisp_Object arg;
{
double d = extract_float (arg);
- IN_FLOAT (d = rint (XFLOAT (arg)->data), "fround", arg);
+ IN_FLOAT (d = rint (d), "fround", arg);
return make_float (d);
}
if (d >= 0.0)
IN_FLOAT (d = floor (d), "ftruncate", arg);
else
- IN_FLOAT (d = ceil (d), arg);
+ IN_FLOAT (d = ceil (d), "ftruncate", arg);
return make_float (d);
}
-#endif
\f
#ifdef FLOAT_CATCH_SIGILL
static SIGTYPE
defsubr (&Serfc);
defsubr (&Slog_gamma);
defsubr (&Scube_root);
+#endif
defsubr (&Sfceiling);
defsubr (&Sffloor);
defsubr (&Sfround);
defsubr (&Sftruncate);
-#endif
defsubr (&Sexp);
defsubr (&Sexpt);
defsubr (&Slog);