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math/math.h (HUGE_VAL): Improve commentary.

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Zack Weinberg
2017-09-01 11:19:47 -04:00
parent ce870587d5
commit a617bd119f
2 changed files with 11 additions and 2 deletions
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ChangeLog
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@@ -1,3 +1,7 @@
2017-09-01 Zack Weinberg <zackw@panix.com>
* math/math.h (HUGE_VAL): Improve commentary.
2017-09-01 Adhemerval Zanella <adhemerval.zanella@linaro.org>
Andreas Schwab <schwab@suse.de>

9
math/math.h
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@@ -37,11 +37,16 @@ __BEGIN_DECLS
/* Gather machine dependent type support. */
#include <bits/floatn.h>
/* Value returned on overflow. On all IEEE754 machines, this is
+Infinity. */
/* Value returned on overflow. With IEEE 754 floating point, this is
+Infinity, otherwise the largest representable positive value. */
#if __GNUC_PREREQ (3, 3)
# define HUGE_VAL (__builtin_huge_val ())
#else
/* This may provoke compiler warnings, and may not be rounded to
+Infinity in all IEEE 754 rounding modes, but is the best that can
be done in ISO C while remaining a constant expression. 10,000 is
greater than the maximum (decimal) exponent for all supported
floating-point formats and widths. */
# define HUGE_VAL 1e10000
#endif
#ifdef __USE_ISOC99