On Wed, 2015-01-14 at 13:36 -0700, Jeff Law wrote: > On 01/14/15 13:32, David Edelsohn wrote: > > The PPC64LE ABI specifies POWER8 ISA as the minimum hardware > > requierment. Currently, Linux distributions are building the > > toolchain using --with-cpu=power7 or power8, as they wish. GCC > > defaults to essentially the POWER4 ISA. > > > > The appended patch changes the default for PPC64LE to POWER8 (ISA > > 2.7). 32-bit PPC SVR4 is not really defined, but it is left unchanged > > with no minimum ISA. > > > > The default ISA can be overridden using --with-cpu= and we presume > > that Linux distributions and users will continue to configure as they > > require for their deployment. > > > > * config/rs6000/default64.h (TARGET_DEFAULT) [LITTLE_ENDIAN]: Use ISA > > 2.7 (POWER8). > Given you've got a new ABI in play here, seems like the perfect time to > bump the default ISA to something reasonable.
Agreed. Given the new ABI requires POWER8 as the minimum, I think this patch is a no brainer. Peter
