OK.
On Thu, Dec 29, 2016 at 10:19 AM, Jakub Jelinek <ja...@redhat.com> wrote: > Hi! > > For integral arg, mark_exp_read is called during > cp_perform_integral_promotions, for complex type it is called during > cp_default_conversion, but for vector types nothing actually calls it. > > Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux, ok for > trunk? > > 2016-12-29 Jakub Jelinek <ja...@redhat.com> > > PR c++/78949 > * typeck.c (cp_build_unary_op): Call mark_rvalue_use on arg if it has > vector type. > > * c-c++-common/Wunused-var-16.c: New test. > > --- gcc/cp/typeck.c.jj 2016-12-21 23:12:01.000000000 +0100 > +++ gcc/cp/typeck.c 2016-12-29 13:48:58.363469890 +0100 > @@ -5907,6 +5907,8 @@ cp_build_unary_op (enum tree_code code, > inform (location, "did you mean to use logical not (%<!%>)?"); > arg = cp_perform_integral_promotions (arg, complain); > } > + else if (!noconvert && VECTOR_TYPE_P (TREE_TYPE (arg))) > + arg = mark_rvalue_use (arg); > break; > > case ABS_EXPR: > --- gcc/testsuite/c-c++-common/Wunused-var-16.c.jj 2016-12-29 > 13:51:07.143825569 +0100 > +++ gcc/testsuite/c-c++-common/Wunused-var-16.c 2016-12-29 13:50:42.000000000 > +0100 > @@ -0,0 +1,15 @@ > +/* PR c++/78949 */ > +/* { dg-do compile } */ > +/* { dg-options "-Wunused" } */ > + > +typedef unsigned char V __attribute__((vector_size(16))); > +V v; > + > +void > +foo () > +{ > + V y = {}; > + V x = {}; // { dg-bogus "set but not used" } > + y &= ~x; > + v = y; > +} > > Jakub