2007-04-24 Hui-May Chang <hm.chang@apple.com>

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

diff --git a/gcc/reload1.c b/gcc/reload1.c
index f29f079..9ee046a 100644 (file)
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -6323,15 +6323,23 @@ merge_assigned_reloads (rtx insn)
                transfer_replacements (i, j);
              }
 
-         /* If this is now RELOAD_OTHER, look for any reloads that load
-            parts of this operand and set them to RELOAD_FOR_OTHER_ADDRESS
-            if they were for inputs, RELOAD_OTHER for outputs.  Note that
-            this test is equivalent to looking for reloads for this operand
-            number.  */
-         /* We must take special care with RELOAD_FOR_OUTPUT_ADDRESS; it may
-            share registers with a RELOAD_FOR_INPUT, so we can not change it
-            to RELOAD_FOR_OTHER_ADDRESS.  We should never need to, since we
-            do not modify RELOAD_FOR_OUTPUT.  */
+         /* If this is now RELOAD_OTHER, look for any reloads that
+            load parts of this operand and set them to
+            RELOAD_FOR_OTHER_ADDRESS if they were for inputs,
+            RELOAD_OTHER for outputs.  Note that this test is
+            equivalent to looking for reloads for this operand
+            number.
+
+            We must take special care with RELOAD_FOR_OUTPUT_ADDRESS;
+            it may share registers with a RELOAD_FOR_INPUT, so we can
+            not change it to RELOAD_FOR_OTHER_ADDRESS.  We should
+            never need to, since we do not modify RELOAD_FOR_OUTPUT.
+
+            It is possible that the RELOAD_FOR_OPERAND_ADDRESS
+            instruction is assigned the same register as the earlier
+            RELOAD_FOR_OTHER_ADDRESS instruction.  Merging these two
+            instructions will cause the RELOAD_FOR_OTHER_ADDRESS
+            instruction to be deleted later on.  */
 
          if (rld[i].when_needed == RELOAD_OTHER)
            for (j = 0; j < n_reloads; j++)
@@ -6339,6 +6347,7 @@ merge_assigned_reloads (rtx insn)
                  && rld[j].when_needed != RELOAD_OTHER
                  && rld[j].when_needed != RELOAD_FOR_OTHER_ADDRESS
                  && rld[j].when_needed != RELOAD_FOR_OUTPUT_ADDRESS
+                 && rld[j].when_needed != RELOAD_FOR_OPERAND_ADDRESS
                  && (! conflicting_input
                      || rld[j].when_needed == RELOAD_FOR_INPUT_ADDRESS
                      || rld[j].when_needed == RELOAD_FOR_INPADDR_ADDRESS)