Date: Sat, 30 Aug 2014 17:14:47 +0000 (UTC) From: Steve Kargl <kargl@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r270845 - head/lib/msun/src Message-ID: <201408301714.s7UHEl0R043670@svn.freebsd.org>
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Author: kargl Date: Sat Aug 30 17:14:47 2014 New Revision: 270845 URL: http://svnweb.freebsd.org/changeset/base/270845 Log: Make tiny volatile to prevent the compiler(s) from constant folding expressions of the form "1 - tiny", which are used to raise FE_INEXACT. Modified: head/lib/msun/src/s_tanh.c head/lib/msun/src/s_tanhf.c Modified: head/lib/msun/src/s_tanh.c ============================================================================== --- head/lib/msun/src/s_tanh.c Sat Aug 30 15:41:07 2014 (r270844) +++ head/lib/msun/src/s_tanh.c Sat Aug 30 17:14:47 2014 (r270845) @@ -42,7 +42,8 @@ __FBSDID("$FreeBSD$"); #include "math.h" #include "math_private.h" -static const double one = 1.0, two = 2.0, tiny = 1.0e-300, huge = 1.0e300; +static volatile const double tiny = 1.0e-300; +static const double one = 1.0, two = 2.0, huge = 1.0e300; double tanh(double x) Modified: head/lib/msun/src/s_tanhf.c ============================================================================== --- head/lib/msun/src/s_tanhf.c Sat Aug 30 15:41:07 2014 (r270844) +++ head/lib/msun/src/s_tanhf.c Sat Aug 30 17:14:47 2014 (r270845) @@ -19,7 +19,9 @@ __FBSDID("$FreeBSD$"); #include "math.h" #include "math_private.h" -static const float one=1.0, two=2.0, tiny = 1.0e-30, huge = 1.0e30; +static volatile const float tiny = 1.0e-30; +static const float one=1.0, two=2.0, huge = 1.0e30; + float tanhf(float x) {
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