On Wed, Jul 20, 2016 at 11:14 AM, Aurelien Jarno <aurel...@aurel32.net> wrote: > On 2016-07-20 11:04, Ramana Radhakrishnan wrote: >> On Wed, Jul 20, 2016 at 10:56 AM, Aurelien Jarno <aurel...@aurel32.net> >> wrote: >> > On 2016-07-20 10:10, Ramana Radhakrishnan wrote: >> >> On Wed, Jul 20, 2016 at 8:48 AM, Aurelien Jarno <aurel...@aurel32.net> >> >> wrote: >> >> > On ARM soft-float, the float to double conversion doesn't convert a sNaN >> >> > to qNaN as the IEEE Std 754 standard mandates: >> >> > >> >> > "Under default exception handling, any operation signaling an invalid >> >> > operation exception and for which a floating-point result is to be >> >> > delivered shall deliver a quiet NaN." >> >> > >> >> > Given the soft float ARM code ignores exceptions and always provides a >> >> > result, a float to double conversion of a signaling NaN should return a >> >> > quiet NaN. Fix this in extendsfdf2. >> >> > >> >> > gcc/ChangeLog: >> >> > >> >> > PR target/59833 >> >> > * config/arm/ieee754-df.S (extendsfdf2): Convert sNaN to qNaN. >> >> > >> >> > gcc/testsuite/ChangeLog: >> >> > >> >> > * gcc.dg/pr59833.c: New testcase. >> >> >> >> >> >> Ok - assuming this was tested appropriately with no regressions. >> > >> > Given it only touches arm code, I only tested it on arm and I have seen >> > no regression. That said I wouldn't be surprised if the new testcase >> > fails on some other architectures. >> >> I was assuming you tested it on ARM :) In this case given the change >> is only in the backend I would have expected this patch to have been >> tested for soft-float ARM or an appropriate multilib. Saying what >> configuration the patch was tested on is useful for the audit trail. >> For e.g. it's no use testing this patch on armhf ( i.e. >> --with-float=hard --with-fpu=vfpv3/neon --with-arch=armv7-a) as by >> default the test would never generate the call to the library function >> but I'm sure you know all that anyway. > > Indeed I should have given more details. I tested it on a Debian armel > machine, and I configured GCC the same way as the Debian package, that > is using --with-arch=armv4t --with-float=soft. > > I built it once with the new test but without the fix and a second time > with both the test and the fix. I have verified that the test fails in > the first case and pass in the second case.
Thanks for the info - what about all the other regression tests ? Did you do a full make check and ensure that no other tests regressed in comparison ? Patches need to be tested against the entire regression testsuite and not just what was added. regards Ramana
