[Bug rtl-optimization/56195] [4.8 Regression] Error: incorrect register `%rdi' used with `l' suffix (at -O2)

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56195



--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-07 
19:47:04 UTC ---

So something like:



--- lra-constraints.c.jj    2013-02-07 18:34:39.000000000 +0100

+++ lra-constraints.c    2013-02-07 20:41:17.051986353 +0100

@@ -421,7 +421,21 @@ get_reload_reg (enum op_type type, enum

       if (rtx_equal_p (curr_insn_input_reloads[i].input, original)

       && in_class_p (curr_insn_input_reloads[i].reg, rclass, &new_class))

     {

-      *result_reg = curr_insn_input_reloads[i].reg;

+      rtx reg = curr_insn_input_reloads[i].reg;

+      /* If input is equal to original and both are VOIDmode,

+         GET_MODE (reg) might be still different from mode.

+         Ensure we don't return *result_reg with wrong mode.  */

+      if (GET_MODE (reg) != mode)

+        {

+          if (GET_MODE_SIZE (GET_MODE (reg)) < GET_MODE_SIZE (mode))

+        continue;

+          reg = simplify_subreg (mode, reg, GET_MODE (reg),

+                     subreg_lowpart_offset (mode,

+                                GET_MODE (reg)));

+          if (reg == NULL_RTX || !REG_P (reg))

+        continue;

+        }

+      *result_reg = reg;

       regno = REGNO (*result_reg);

       if (lra_dump_file != NULL)

         {



?