On Tue, Oct 6, 2015 at 1:43 PM, H.J. Lu <hongjiu...@intel.com> wrote: > Since targetm.expand_to_rtl_hook may be called to switch ABI, it should > be called for each function before expanding to RTL. Otherwise, we may > use the stale information from compilation of the previous function. > aggregate_value_p uses call_used_regs. aggregate_value_p is used by > IPA and return value optimization, which are called before > pass_expand::execute after RTL expansion starts. We need to call > targetm.expand_to_rtl_hook early enough in cgraph_node::expand to make > sure that everything is in sync when RTL expansion starts. > > Tested on Linux/x86-64. OK for trunk?
Hmm, I think set_cfun hook should handle this. expand_to_rtl_hook shouldn't mess with per-function stuff. Richard. > > H.J. > --- > PR middle-end/67850 > * cfgexpand.c (pass_expand::execute): Don't call > targetm.expand_to_rtl_hook here. > * cgraphunit.c (cgraph_node::expand): Call > targetm.expand_to_rtl_hook here. > --- > gcc/cfgexpand.c | 1 - > gcc/cgraphunit.c | 3 +++ > 2 files changed, 3 insertions(+), 1 deletion(-) > > diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c > index 58e55d2..6891750 100644 > --- a/gcc/cfgexpand.c > +++ b/gcc/cfgexpand.c > @@ -6150,7 +6150,6 @@ pass_expand::execute (function *fun) > /* Mark arrays indexed with non-constant indices with TREE_ADDRESSABLE. */ > discover_nonconstant_array_refs (); > > - targetm.expand_to_rtl_hook (); > crtl->stack_alignment_needed = STACK_BOUNDARY; > crtl->max_used_stack_slot_alignment = STACK_BOUNDARY; > crtl->stack_alignment_estimated = 0; > diff --git a/gcc/cgraphunit.c b/gcc/cgraphunit.c > index 04a4d3f..537a089 100644 > --- a/gcc/cgraphunit.c > +++ b/gcc/cgraphunit.c > @@ -1973,6 +1973,9 @@ cgraph_node::expand (void) > > bitmap_obstack_initialize (®_obstack); /* FIXME, only at RTL > generation*/ > > + /* It may update call_used_regs, which is used by aggregate_value_p. */ > + targetm.expand_to_rtl_hook (); > + > execute_all_ipa_transforms (); > > /* Perform all tree transforms and optimizations. */ > -- > 2.4.3 >
