(emit_unop_insn): Don't do -fforce-mem for SIGN_EXTEND.

[pf3gnuchains/gcc-fork.git] / gcc / optabs.c

diff --git a/gcc/optabs.c b/gcc/optabs.c
index c0bf959..cae4c4e 100644 (file)
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -15,7 +15,8 @@ GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
 
 
 #include "config.h"
@@ -2373,7 +2374,9 @@ emit_unop_insn (icode, target, op0, code)
 
   op0 = protect_from_queue (op0, 0);
 
-  if (flag_force_mem)
+  /* Sign extension from memory is often done specially on RISC
+     machines, so forcing into a register here can pessimize code.  */
+  if (flag_force_mem && code != SIGN_EXTEND)
     op0 = force_not_mem (op0);
 
   /* Now, if insn does not accept our operands, put them into pseudos.  */
@@ -2744,12 +2747,17 @@ emit_cmp_insn (x, y, comparison, size, mode, unsignedp, align)
          emit_library_call (memcmp_libfunc, 0,
                             TYPE_MODE (integer_type_node), 3,
                             XEXP (x, 0), Pmode, XEXP (y, 0), Pmode,
-                            size, Pmode);
+                            convert_to_mode (TYPE_MODE (sizetype), size,
+                                             TREE_UNSIGNED (sizetype)),
+                            TYPE_MODE (sizetype));
 #else
          emit_library_call (bcmp_libfunc, 0,
                             TYPE_MODE (integer_type_node), 3,
                             XEXP (x, 0), Pmode, XEXP (y, 0), Pmode,
-                            size, Pmode);
+                            convert_to_mode (TYPE_MODE (integer_type_node),
+                                             size,
+                                             TREE_UNSIGNED (integer_type_node)),
+                            TYPE_MODE (integer_type_node));
 #endif
          emit_cmp_insn (hard_libcall_value (TYPE_MODE (integer_type_node)),
                         const0_rtx, comparison, NULL_RTX,
@@ -3510,6 +3518,7 @@ expand_float (to, from, unsignedp)
              /* The sign bit is not set.  Convert as signed.  */
              expand_float (target, from, 0);
              emit_jump_insn (gen_jump (label));
+             emit_barrier ();
 
              /* The sign bit is set.
                 Convert to a usable (positive signed) value by shifting right
@@ -4077,6 +4086,7 @@ init_optabs ()
   for (i = 0; i < NUM_MACHINE_MODES; i++)
     {
       movstr_optab[i] = CODE_FOR_nothing;
+      clrstr_optab[i] = CODE_FOR_nothing;
 
 #ifdef HAVE_SECONDARY_RELOADS
       reload_in_optab[i] = reload_out_optab[i] = CODE_FOR_nothing;