* reload1.c (reg_set_luid): Fix a comment typo.

[pf3gnuchains/gcc-fork.git] / gcc / reload1.c

diff --git a/gcc/reload1.c b/gcc/reload1.c
index c70694b..edfd5d5 100644 (file)
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -8025,6 +8025,9 @@ static int
 reload_cse_noop_set_p (set)
      rtx set;
 {
+  if (cselib_reg_set_mode (SET_DEST (set)) != GET_MODE (SET_DEST (set)))
+    return 0;
+
   return rtx_equal_for_cselib_p (SET_DEST (set), SET_SRC (set));
 }
 
@@ -9062,7 +9065,7 @@ reload_combine_note_use (xp, insn)
    use move2add_last_label_luid to note where the label is and then
    later disable any optimization that would cross it.
    reg_offset[n] / reg_base_reg[n] / reg_mode[n] are only valid if
-   reg_set_luid[n] is greater than last_label_luid[n] .  */
+   reg_set_luid[n] is greater than move2add_last_label_luid.  */
 static int reg_set_luid[FIRST_PSEUDO_REGISTER];
 
 /* If reg_base_reg[n] is negative, register n has been set to
@@ -9162,8 +9165,16 @@ reload_cse_move2add (first)
                    validate_change (insn, &SET_SRC (pat), reg, 0);
                  else if (rtx_cost (new_src, PLUS) < rtx_cost (src, SET)
                           && have_add2_insn (reg, new_src))
-                   validate_change (insn, &PATTERN (insn),
-                                    gen_add2_insn (reg, new_src), 0);
+                   {
+                     rtx newpat = gen_add2_insn (reg, new_src);
+                     if (INSN_P (newpat) && NEXT_INSN (newpat) == NULL_RTX)
+                       newpat = PATTERN (newpat);
+                     /* If it was the first insn of a sequence or
+                        some other emitted insn, validate_change will
+                        reject it.  */
+                     validate_change (insn, &PATTERN (insn),
+                                      newpat, 0);
+                   }
                  else
                    {
                      enum machine_mode narrow_mode;
@@ -9243,9 +9254,15 @@ reload_cse_move2add (first)
                      else if ((rtx_cost (new_src, PLUS)
                                < COSTS_N_INSNS (1) + rtx_cost (src3, SET))
                               && have_add2_insn (reg, new_src))
-                       success
-                         = validate_change (next, &PATTERN (next),
-                                            gen_add2_insn (reg, new_src), 0);
+                       {
+                         rtx newpat = gen_add2_insn (reg, new_src);
+                         if (INSN_P (newpat)
+                             && NEXT_INSN (newpat) == NULL_RTX)
+                           newpat = PATTERN (newpat);
+                         success
+                           = validate_change (next, &PATTERN (next),
+                                              newpat, 0);
+                       }
                      if (success)
                        delete_insn (insn);
                      insn = next;