[Bug target/55672] [4.8 Regression] -fstack-check=generic ICEs in print_reg, at config/i386/i386.c:13868

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55672



--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> 2012-12-18 15:11:38 
UTC ---

This is what we changed in reload for stack realignment:



diff --git a/gcc/reload1.c b/gcc/reload1.c

index f28b01c..9b81062 100644

--- a/gcc/reload1.c

+++ b/gcc/reload1.c

@@ -3663,8 +3663,11 @@ update_eliminables (HARD_REG_SET *pset)

   frame_pointer_needed = 1;

   for (ep = reg_eliminate; ep < &reg_eliminate[NUM_ELIMINABLE_REGS]; ep++)

     {

-      if (ep->can_eliminate && ep->from == FRAME_POINTER_REGNUM

-         && ep->to != HARD_FRAME_POINTER_REGNUM)

+      if (ep->can_eliminate

+         && ep->from == FRAME_POINTER_REGNUM

+         && ep->to != HARD_FRAME_POINTER_REGNUM

+         && (! SUPPORTS_STACK_ALIGNMENT

+             || ! crtl->stack_realign_needed))

        frame_pointer_needed = 0;



       if (! ep->can_eliminate && ep->can_eliminate_previous)

@@ -3720,7 +3723,10 @@ init_elim_table (void)

       ep->to = ep1->to;

       ep->can_eliminate = ep->can_eliminate_previous

        = (CAN_ELIMINATE (ep->from, ep->to)

-          && ! (ep->to == STACK_POINTER_REGNUM && frame_pointer_needed));

+          && ! (ep->to == STACK_POINTER_REGNUM

+                && frame_pointer_needed 

+                && (! SUPPORTS_STACK_ALIGNMENT

+                    || ! stack_realign_fp)));

     }

 #else

   reg_eliminate[0].from = reg_eliminate_1[0].from;





LRA should have similar codes.