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Re: [PATCH] Use -frounding-math for math testsuite
On Wednesday, May 02, 2012 16:32:23 Joseph S. Myers wrote:
> 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).
Do you really mean all libraries - or just the math subdirectory?
Andreas
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