The attached patch fixes a problem identified in PR66870 with
split stack on ppc64 and ppc64le.  If flag_split_stack is true, but
the function being processed has the no_split_stack attribute, then
the split stack prologue should not be generated.

Bootstrapped on ppc64le-linux and ppc64-linux, passed the
go and libgo testsuites (where split stack is enabled by default).


gcc/ChangeLog

2015-07-30    Lynn Boger <laboger@linux.vnet.ibm.com>

                 PR66870
                 * gcc/config/rs6000/rs6000.c:  Add check for no_split_stack
                 function attribute along with flag_split_stack check to
                 determine when to generate split stack prologue for
                 ppc64 and ppc64le.