[PATCH] regrename: Use PC instead of CC0 to hide operands

[Segher Boessenkool]

The regrename pass temporarily changes some operand RTL to CC0 so that
note_stores and scan_rtx don't see those operands.  CC0 is deprecated
and we want to remove it, so we need to use something else here.
PC fits the bill fine.

Tested on powerpc64-linux {-m32,-m64}.  Is this okay for trunk?


Segher


2019-10-01  Segher Boessenkool  <seg...@kernel.crashing.org>

        * regrename.c (hide_operands): Use pc_rtx instead of cc0_rtx.

---
 gcc/regrename.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/gcc/regrename.c b/gcc/regrename.c
index 8c3bae8..ed1dcde 100644
--- a/gcc/regrename.c
+++ b/gcc/regrename.c
@@ -1517,7 +1517,7 @@ scan_rtx (rtx_insn *insn, rtx *loc, enum reg_class cl, 
enum scan_actions action,
 }
 
 /* Hide operands of the current insn (of which there are N_OPS) by
-   substituting cc0 for them.
+   substituting pc for them.
    Previous values are stored in the OLD_OPERANDS and OLD_DUPS.
    For every bit set in DO_NOT_HIDE, we leave the operand alone.
    If INOUT_AND_EC_ONLY is set, we only do this for OP_INOUT type operands
@@ -1541,7 +1541,7 @@ hide_operands (int n_ops, rtx *old_operands, rtx 
*old_dups,
        continue;
       if (!inout_and_ec_only || recog_data.operand_type[i] == OP_INOUT
          || op_alt[i].earlyclobber)
-       *recog_data.operand_loc[i] = cc0_rtx;
+       *recog_data.operand_loc[i] = pc_rtx;
     }
   for (i = 0; i < recog_data.n_dups; i++)
     {
@@ -1551,7 +1551,7 @@ hide_operands (int n_ops, rtx *old_operands, rtx 
*old_dups,
        continue;
       if (!inout_and_ec_only || recog_data.operand_type[opn] == OP_INOUT
          || op_alt[opn].earlyclobber)
-       *recog_data.dup_loc[i] = cc0_rtx;
+       *recog_data.dup_loc[i] = pc_rtx;
     }
 }
 
-- 
1.8.3.1