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Re: [PATCH] Use -frounding-math for math testsuite
On Wed, 2 May 2012, Joseph S. Myers wrote:
> Please commit this. Strictly we should compile all the libraries with
> -frounding-math as well, since library functions may be called in any
> rounding mode (and without -frounding-math, round-to-nearest is assumed);
> the only things for which it's not needed are the miscellaneous
> executables, and those testcases (i.e. all except the ones this patch
> addresses) that don't change the rounding mode.
Incidentally, compiling libraries with -frounding-math should fix bugs
such as <http://sourceware.org/bugzilla/show_bug.cgi?id=10846> with
missing underflow exceptions (it's still a GCC bug that it folds these
underflowing operations with -ftrapping-math -fno-rounding-math, but
-frounding-math works around the GCC bug by disabling that folding since
the result is inexact).
--
Joseph S. Myers
joseph@codesourcery.com