[Bug middle-end/55597] [4.8 Regression] internal compiler error: in plus_constant, at explow.c:88

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55597

--- Comment #9 from Uros Bizjak <ubizjak at gmail dot com> 2012-12-05 20:45:40 UTC ---
I think it is better to fixup all sites where equivalent is used:

--cut here--
Index: i386.c
===================================================================
--- i386.c      (revision 194226)
+++ i386.c      (working copy)
@@ -12754,11 +12754,17 @@ ix86_tls_module_base (void)
 static rtx
 legitimize_tls_address (rtx x, enum tls_model model, bool for_mov)
 {
+  rtx xeq;
   rtx dest, base, off;
   rtx pic = NULL_RTX, tp = NULL_RTX;
   enum machine_mode tp_mode = Pmode;
   int type;

+  if (GET_MODE (x) != Pmode)
+    xeq = gen_rtx_ZERO_EXTEND (Pmode, x);
+  else
+    xeq = x;
+
   switch (model)
     {
     case TLS_MODEL_GLOBAL_DYNAMIC:
@@ -12785,7 +12791,7 @@ legitimize_tls_address (rtx x, enum tls_model mode
          tp = get_thread_pointer (Pmode, true);
          dest = force_reg (Pmode, gen_rtx_PLUS (Pmode, tp, dest));

-         set_unique_reg_note (get_last_insn (), REG_EQUAL, x);
+         set_unique_reg_note (get_last_insn (), REG_EQUAL, xeq);
        }
       else
        {
@@ -12802,7 +12808,7 @@ legitimize_tls_address (rtx x, enum tls_model mode
              end_sequence ();

              RTL_CONST_CALL_P (insns) = 1;
-             emit_libcall_block (insns, dest, rax, x);
+             emit_libcall_block (insns, dest, rax, xeq);
            }
          else
            emit_insn (gen_tls_global_dynamic_32 (dest, x, pic, caddr));
@@ -12871,7 +12877,7 @@ legitimize_tls_address (rtx x, enum tls_model mode
        {
          dest = force_reg (Pmode, gen_rtx_PLUS (Pmode, dest, tp));

-         set_unique_reg_note (get_last_insn (), REG_EQUAL, x);
+         set_unique_reg_note (get_last_insn (), REG_EQUAL, xeq);
        }
       break;

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