regrename: Use PC instead of CC0 to hide operands

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.

	* regrename.c (hide_operands): Use pc_rtx instead of cc0_rtx.
	(build_def_use): Use PC instead of CC0 in a comment.

From-SVN: r276401

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2c515e156fc29e193ca628f15e142891328b7fc9..4d0ce47913da7781edad15bc16d94c937e1d54ac 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2019-10-01  Segher Boessenkool  <segher@kernel.crashing.org>
+
+       * regrename.c (hide_operands): Use pc_rtx instead of cc0_rtx.
+       (build_def_use): Use PC instead of CC0 in a comment.
+
 2019-10-01  Richard Sandiford  <richard.sandiford@arm.com>
 
        * rtl.def (CLOBBER_HIGH): Delete.

diff --git a/gcc/regrename.c b/gcc/regrename.c
index 8c3bae8998c4decc788f940d265f7449f604571b..408bccc7c70403e4767ebf2e3bcab5345cb1f011 100644 (file)
--- 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;
     }
 }
 
@@ -1754,7 +1754,7 @@ build_def_use (basic_block bb)
 
          /* Step 2: Mark chains for which we have reads outside operands
             as unrenamable.
-            We do this by munging all operands into CC0, and closing
+            We do this by munging all operands into PC, and closing
             everything remaining.  */
 
          hide_operands (n_ops, old_operands, old_dups, untracked_operands,