docs/probe_math_exception.c:

	update example
libc/sysdeps/linux/i386/bits/mathinline.h:
	improve __finite() macro, add __finitef macro
	(why they aren't always macros? why aren't they arch independent?)
libm/math_private.h:
	much better comments on math_opt_barrier() and math_force_eval()
libm/s_finite[f].c:
	improve out-of-line __finite[f]() too (one byte less, yay...)

1 files changed, 14 insertions, 3 deletions

diff --git a/libc/sysdeps/linux/i386/bits/mathinline.h b/libc/sysdeps/linux/i386/bits/mathinline.h
index ca7277d76..5caf73353 100644
--- a/libc/sysdeps/linux/i386/bits/mathinline.h
+++ b/libc/sysdeps/linux/i386/bits/mathinline.h
@@ -713,11 +713,22 @@ __inline_mathcodeNP2 (drem, __x, __y, \
 __MATH_INLINE int
 __NTH (__finite (double __x))
 {
-  return (__extension__
-	  (((((union { double __d; int __i[2]; }) {__d: __x}).__i[1]
-	     | 0x800fffffu) + 1) >> 31));
+  union { double __d; int __i[2]; } u;
+  u.__d = __x;
+  /* Finite numbers have at least one zero bit in exponent. */
+  /* All other numbers will result in 0xffffffff after OR: */
+  return (u.__i[1] | 0x800fffff) != 0xffffffff;
 }
 
+__MATH_INLINE int
+__NTH (__finitef (float __x))
+{
+  union { float __d; int __i; } u;
+  u.__d = __x;
+  return (u.__i | 0x807fffff) != 0xffffffff;
+}
+
+
 /* Miscellaneous functions */
 # ifdef __FAST_MATH__
 __inline_mathcode (__coshm1, __x, \