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Reimplement isinf/isnan/fpclassify.

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Also move isinf and isnan into libc like everyone else.

Also move fpclassify to libc like the BSDs (but unlike glibc). We need
this to be able to upgrade our float/double/long double parsing to gdtoa.

Also add some missing aliases. We now have all of:

  isnan, __isnan, isnanf, __isnanf, isnanl, __isnanl,
  isinf, __isinf, isinff, __isinff, isinfl, __isinfl,
  __fpclassify, __fpclassifyd, __fpclassifyf, __fpclassifyl.

Bug: 13469877
Change-Id: I407ffbac06c765a6c5fffda8106c37d7db04f27d
This commit is contained in:
Elliott Hughes
2014-04-11 17:02:20 -07:00
parent 0558906866
commit 02c78a3867
13 changed files with 300 additions and 296 deletions
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35
libc/stdio/vfprintf.c
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@@ -154,12 +154,6 @@ static int exponent(char *, int, int);
#define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */
/* BIONIC: do not link libm for only two rather simple functions */
#ifdef FLOATING_POINT
static int _my_isinf(double);
static int _my_isnan(double);
#endif
/*
* Macros for converting digits to letters and vice versa
*/
@@ -543,14 +537,14 @@ reswitch: switch (ch) {
}
/* do this before tricky precision changes */
if (_my_isinf(_double)) {
if (isinf(_double)) {
if (_double < 0)
sign = '-';
cp = "Inf";
size = 3;
break;
}
if (_my_isnan(_double)) {
if (isnan(_double)) {
cp = "NaN";
size = 3;
break;
@@ -1331,29 +1325,4 @@ exponent(char *p0, int exp, int fmtch)
return (p - p0);
}
/* BIONIC */
#include <machine/ieee.h>
typedef union {
double d;
struct ieee_double i;
} ieee_u;
static int
_my_isinf (double value)
{
ieee_u u;
u.d = value;
return (u.i.dbl_exp == 2047 && u.i.dbl_frach == 0 && u.i.dbl_fracl == 0);
}
static int
_my_isnan (double value)
{
ieee_u u;
u.d = value;
return (u.i.dbl_exp == 2047 && (u.i.dbl_frach != 0 || u.i.dbl_fracl != 0));
}
#endif /* FLOATING_POINT */