https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58372
--- Comment #40 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Terry Guo from comment #39)
> (In reply to Uroš Bizjak from comment #38)
> > (In reply to Terry Guo from comment #36)
> >
> > > OK. Do it right now.
> >
> > I think that latest attachment is the one that should be tested.
> > Functionally it is the same, but avoids unnecessary variable updates before
> > expand_stack_alignment is called. expand_stack_alignment will do everything
> > for us.
>
> Yes. The latest one works perfectly. Bootstrap and regression test on x86_64
> show no problem. I also managed to build a gcc for i686-w64-mingw32 with
> SJLJ enabled, the case can be compiled successfully.
Then we can just move the call to finish_eh_generation in pass_expand::execute
in front of expand_stack_alignment:
--cut here--
Index: cfgexpand.c
===================================================================
--- cfgexpand.c (revision 265582)
+++ cfgexpand.c (working copy)
@@ -6510,6 +6510,12 @@ pass_expand::execute (function *fun)
find_many_sub_basic_blocks (blocks);
purge_all_dead_edges ();
+ /* After initial rtl generation, call back to finish generating
+ exception support code. We need to do this before cleaning up
+ the CFG as the code does not expect dead landing pads. */
+ if (fun->eh->region_tree != NULL)
+ finish_eh_generation ();
+
expand_stack_alignment ();
/* Fixup REG_EQUIV notes in the prologue if there are tailcalls in this
@@ -6517,12 +6523,6 @@ pass_expand::execute (function *fun)
if (crtl->tail_call_emit)
fixup_tail_calls ();
- /* After initial rtl generation, call back to finish generating
- exception support code. We need to do this before cleaning up
- the CFG as the code does not expect dead landing pads. */
- if (fun->eh->region_tree != NULL)
- finish_eh_generation ();
-
/* BB subdivision may have created basic blocks that are are only reachable
from unlikely bbs but not marked as such in the profile. */
if (optimize)
--cut here--
And indeed, the above patch works without problems for me.
