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math.h: numerical values in question
- From: Denis Excoffier <cygwin at Denis-Excoffier dot org>
- To: newlib at sourceware dot org
- Date: Sat, 9 Aug 2014 07:40:57 +0200
- Subject: math.h: numerical values in question
- Authentication-results: sourceware.org; auth=none
Hello,
Perhaps some numerical values stored in math.h are not as accurate as they could be,
for example
diff -uNr a/math.h a/math.h
--- a/math.h 2014-08-07 18:26:21.000000000 +0200
+++ b/math.h 2014-08-07 19:31:51.000000000 +0200
@@ -569,14 +569,14 @@
#ifndef __STRICT_ANSI__
#define M_TWOPI (M_PI * 2.0)
-#define M_3PI_4 2.3561944901923448370E0
-#define M_SQRTPI 1.77245385090551602792981
+#define M_3PI_4 2.3561944901923449288E0
+#define M_SQRTPI 1.77245385090551602729817
#define M_LN2LO 1.9082149292705877000E-10
#define M_LN2HI 6.9314718036912381649E-1
-#define M_SQRT3 1.73205080756887719000
+#define M_SQRT3 1.73205080756887729353
#define M_IVLN10 0.43429448190325182765 /* 1 / log(10) */
#define M_LOG2_E _M_LN2
-#define M_INVLN2 1.4426950408889633870E0 /* 1 / log(2) */
+#define M_INVLN2 1.4426950408889634074E0 /* 1 / log(2) */
/* Global control over fdlibm error handling. */
On the other hand, if some value is not "as one would expect", please
add a comment.
Regards,
Denis Excoffier.