reload.c (find_reloads): Emit a USE for a pseudo register without a hard register...

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        * reload.c (find_reloads): Emit a USE for a pseudo register without
        a hard register if we could not create an optional reload for the
        pseudo.

From-SVN: r28103

diff --git a/gcc/reload.c b/gcc/reload.c
index 011f899..d8b4136 100644 (file)
--- a/gcc/reload.c
+++ b/gcc/reload.c
@@ -3803,11 +3803,16 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p)
                           (insn_code_number < 0 ? 0
                            : insn_operand_strict_low[insn_code_number][i]),
                           1, i, operand_type[i]);
-       /* If a memory reference remains, yet we can't make an optional
+       /* If a memory reference remains (either as a MEM or a pseudo that
+          did not get a hard register), yet we can't make an optional
           reload, check if this is actually a pseudo register reference;
           we then need to emit a USE and/or a CLOBBER so that reload
           inheritance will do the right thing.  */
-       else if (replace && GET_CODE (operand) == MEM)
+       else if (replace
+                && (GET_CODE (operand) == MEM
+                    || (GET_CODE (operand) == REG
+                        && REGNO (operand) >= FIRST_PSEUDO_REGISTER
+                        && reg_renumber [REGNO (operand)] < 0)))
          {
            operand = *recog_operand_loc[i];