2011-11-07 Terry Guo <terry.guo@arm.com>

[pf3gnuchains/gcc-fork.git] / gcc / emit-rtl.c

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index ee38d3c..c2bc56b 100644 (file)
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -93,9 +93,10 @@ static GTY(()) int label_num = 1;
 
 /* We record floating-point CONST_DOUBLEs in each floating-point mode for
    the values of 0, 1, and 2.  For the integer entries and VOIDmode, we
-   record a copy of const[012]_rtx.  */
+   record a copy of const[012]_rtx and constm1_rtx.  CONSTM1_RTX
+   is set only for MODE_INT and MODE_VECTOR_INT modes.  */
 
-rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
+rtx const_tiny_rtx[4][(int) MAX_MACHINE_MODE];
 
 rtx const_true_rtx;
 
@@ -1695,6 +1696,12 @@ set_mem_attributes_minus_bitpos (rtx ref, tree t, int objectp,
          && !TREE_THIS_VOLATILE (base))
        MEM_READONLY_P (ref) = 1;
 
+      /* Mark static const strings readonly as well.  */
+      if (base && TREE_CODE (base) == STRING_CST
+         && TREE_READONLY (base)
+         && TREE_STATIC (base))
+       MEM_READONLY_P (ref) = 1;
+
       /* If this expression uses it's parent's alias set, mark it such
         that we won't change it.  */
       if (component_uses_parent_alias_set (t))
@@ -3323,21 +3330,6 @@ next_label (rtx insn)
   return insn;
 }
 
-/* Return the last CODE_LABEL before the insn INSN, or 0 if there is none.  */
-
-rtx
-prev_label (rtx insn)
-{
-  while (insn)
-    {
-      insn = PREV_INSN (insn);
-      if (insn == 0 || LABEL_P (insn))
-       break;
-    }
-
-  return insn;
-}
-
 /* Return the last label to mark the same position as LABEL.  Return LABEL
    itself if it is null or any return rtx.  */
 
@@ -5514,6 +5506,8 @@ gen_rtx_CONST_VECTOR (enum machine_mode mode, rtvec v)
        return CONST0_RTX (mode);
       else if (x == CONST1_RTX (inner))
        return CONST1_RTX (mode);
+      else if (x == CONSTM1_RTX (inner))
+       return CONSTM1_RTX (mode);
     }
 
   return gen_rtx_raw_CONST_VECTOR (mode, v);
@@ -5674,7 +5668,7 @@ init_emit_once (void)
   dconsthalf = dconst1;
   SET_REAL_EXP (&dconsthalf, REAL_EXP (&dconsthalf) - 1);
 
-  for (i = 0; i < (int) ARRAY_SIZE (const_tiny_rtx); i++)
+  for (i = 0; i < 3; i++)
     {
       const REAL_VALUE_TYPE *const r =
        (i == 0 ? &dconst0 : i == 1 ? &dconst1 : &dconst2);
@@ -5704,6 +5698,13 @@ init_emit_once (void)
        const_tiny_rtx[i][(int) mode] = GEN_INT (i);
     }
 
+  const_tiny_rtx[3][(int) VOIDmode] = constm1_rtx;
+
+  for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
+       mode != VOIDmode;
+       mode = GET_MODE_WIDER_MODE (mode))
+    const_tiny_rtx[3][(int) mode] = constm1_rtx;
+
   for (mode = GET_CLASS_NARROWEST_MODE (MODE_COMPLEX_INT);
        mode != VOIDmode;
        mode = GET_MODE_WIDER_MODE (mode))
@@ -5726,6 +5727,7 @@ init_emit_once (void)
     {
       const_tiny_rtx[0][(int) mode] = gen_const_vector (mode, 0);
       const_tiny_rtx[1][(int) mode] = gen_const_vector (mode, 1);
+      const_tiny_rtx[3][(int) mode] = gen_const_vector (mode, 3);
     }
 
   for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);