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

[ubizjak at gmail dot com]

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:



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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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