[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.