[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 #12 from Uros Bizjak <ubizjak at gmail dot com> 2012-12-06 20:14:06 
UTC ---

(In reply to comment #11)

 > It works.  Thanks.

> 

> Unfortunately it creates GC garbage often unnecessary, when it won't be used 
> at

> all.



I agree. Let's keep zext together with their users:



--cut here--

Index: i386.c

===================================================================

--- i386.c      (revision 194263)

+++ i386.c      (working copy)

@@ -12785,6 +12785,9 @@

          tp = get_thread_pointer (Pmode, true);

          dest = force_reg (Pmode, gen_rtx_PLUS (Pmode, tp, dest));



+         if (GET_MODE (x) != Pmode)

+           x = gen_rtx_ZERO_EXTEND (Pmode, x);

+

          set_unique_reg_note (get_last_insn (), REG_EQUAL, x);

        }

       else

@@ -12793,15 +12796,20 @@



          if (TARGET_64BIT)

            {

-             rtx rax = gen_rtx_REG (Pmode, AX_REG), insns;

+             rtx rax = gen_rtx_REG (Pmode, AX_REG);

+             rtx insns;



              start_sequence ();

-             emit_call_insn (ix86_gen_tls_global_dynamic_64 (rax, x,

-                                                             caddr));

+             emit_call_insn

+               (ix86_gen_tls_global_dynamic_64 (rax, x, caddr));

              insns = get_insns ();

              end_sequence ();



              RTL_CONST_CALL_P (insns) = 1;

+

+             if (GET_MODE (x) != Pmode)

+               x = gen_rtx_ZERO_EXTEND (Pmode, x);

+

              emit_libcall_block (insns, dest, rax, x);

            }

          else

@@ -12842,11 +12850,12 @@



          if (TARGET_64BIT)

            {

-             rtx rax = gen_rtx_REG (Pmode, AX_REG), insns, eqv;

+             rtx rax = gen_rtx_REG (Pmode, AX_REG);

+             rtx insns, eqv;



              start_sequence ();

-             emit_call_insn (ix86_gen_tls_local_dynamic_base_64 (rax,

-                                                                 caddr));

+             emit_call_insn

+               (ix86_gen_tls_local_dynamic_base_64 (rax, caddr));

              insns = get_insns ();

              end_sequence ();



@@ -12871,6 +12880,9 @@

        {

          dest = force_reg (Pmode, gen_rtx_PLUS (Pmode, dest, tp));



+         if (GET_MODE (x) != Pmode)

+           x = gen_rtx_ZERO_EXTEND (Pmode, x);

+

          set_unique_reg_note (get_last_insn (), REG_EQUAL, x);

        }

       break;

--cut here--