except.c (emit_eh_context): Make the EH context register stay alive at -O0 so…

except.c (emit_eh_context): Make the EH context register stay alive at -O0 so stupid.c doesn't get confused.

Thu Oct 29 14:10:22 EST 1998  Andrew MacLeod  <amacleod@cygnus.com>
        * except.c (emit_eh_context): Make the EH context register stay alive
        at -O0 so stupid.c doesn't get confused.

From-SVN: r23423

gcc/ChangeLog

+Thu Oct 29 14:10:22 EST 1998  Andrew MacLeod  <amacleod@cygnus.com>
+
+	* except.c (emit_eh_context): Make the EH context register stay alive
+	at -O0 so stupid.c doesn't get confused.
+
 1998-10-29 Herman A.J. ten Brugge <Haj.Ten.Brugge@net.HCC.nl>
 
 	* emit-rtl.c (try_split): Do not try to split a BARRIER.

gcc/except.c

@@ -2094,6 +2094,14 @@ emit_eh_context ()
 	    end_sequence ();
 
 	    emit_insns_before (insns, insn);
+
+            /* At -O0, we must make the context register stay alive so
+               that the stupid.c register allocator doesn't get confused. */
+            if (obey_regdecls != 0)
+              {
+                insns = gen_rtx_USE (GET_MODE (XEXP (reg,0)), XEXP (reg,0));
+                emit_insn_before (insns, get_last_insn ());
+              }
 	  }
       }
 }