Richard Biener via Gcc-patches <gcc-patches@gcc.gnu.org> writes: > Currently we diagnose vector lowering of V1mode operations that > are not natively supported into V_C_E, scalar op plus CTOR with > -Wvector-operation-performance but that's hardly useful behavior > even though the way we lower things can be improved. > > The following disables the diagnostics for the cases the vect.exp > testsuite runs into, on x86 that are vect-cond-11.c and > vect-singleton_1.c. > > Bootstrap / regtest pending on x86_64-unknown-linux-gnu. > > Comments?
Makes sense to me FWIW. Thanks, Richard > Thanks, > Richard. > > 2022-01-19 Richard Biener <rguent...@suse.de> > > PR tree-optimization/104114 > * tree-vect-generic.c (expand_vector_piecewise): Do not diagnose > single element vector decomposition. > --- > gcc/tree-vect-generic.cc | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/gcc/tree-vect-generic.cc b/gcc/tree-vect-generic.cc > index 5814a71a5bb..f4fc7d16119 100644 > --- a/gcc/tree-vect-generic.cc > +++ b/gcc/tree-vect-generic.cc > @@ -317,7 +317,10 @@ expand_vector_piecewise (gimple_stmt_iterator *gsi, > elem_op_func f, > int i; > location_t loc = gimple_location (gsi_stmt (*gsi)); > > - if (ret_type || !parallel_p) > + if (nunits == 1) > + /* Do not diagnose decomposing single element vectors. */ > + ; > + else if (ret_type || !parallel_p) > warning_at (loc, OPT_Wvector_operation_performance, > "vector operation will be expanded piecewise"); > else
