[gcc r13-2506] rs6000: fix misleading new patterns of splitters

[gcc r13-2506] rs6000: fix misleading new patterns of splitters

[Jiu Fu Guo]

https://gcc.gnu.org/g:34ea461fdb471b4d9afa555da69dbc6d02713c54

commit r13-2506-g34ea461fdb471b4d9afa555da69dbc6d02713c54
Author: Jiufu Guo <guojiufu@linux.ibm.com>
Date:   Thu Aug 11 20:01:28 2022 +0800

    rs6000: fix misleading new patterns of splitters
    
    As a comment in
    https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599556.html
    
    Those splitters call rs6000_emit_set_const directly, and the replacements
    are never used.  Using (pc) would be less misleading.
    
    gcc/ChangeLog:
    
            * config/rs6000/rs6000.md: (constant splitters): Use "(pc)" as the
            replacements.

Diff:
---
 gcc/config/rs6000/rs6000.md | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index e9e5cd1e54d..85b97389d82 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -7773,11 +7773,7 @@
   [(set (match_operand:SI 0 "gpc_reg_operand")
 	(match_operand:SI 1 "const_int_operand"))]
   "num_insns_constant (operands[1], SImode) > 1"
-  [(set (match_dup 0)
-	(match_dup 2))
-   (set (match_dup 0)
-	(ior:SI (match_dup 0)
-		(match_dup 3)))]
+  [(pc)]
 {
   if (rs6000_emit_set_const (operands[0], operands[1]))
     DONE;
@@ -9708,8 +9704,7 @@
   [(set (match_operand:DI 0 "int_reg_operand_not_pseudo")
 	(match_operand:DI 1 "const_int_operand"))]
   "TARGET_POWERPC64 && num_insns_constant (operands[1], DImode) > 1"
-  [(set (match_dup 0) (match_dup 2))
-   (set (match_dup 0) (plus:DI (match_dup 0) (match_dup 3)))]
+  [(pc)]
 {
   if (rs6000_emit_set_const (operands[0], operands[1]))
     DONE;
@@ -9721,8 +9716,7 @@
   [(set (match_operand:DI 0 "int_reg_operand_not_pseudo")
 	(match_operand:DI 1 "const_scalar_int_operand"))]
   "TARGET_POWERPC64 && num_insns_constant (operands[1], DImode) > 1"
-  [(set (match_dup 0) (match_dup 2))
-   (set (match_dup 0) (plus:DI (match_dup 0) (match_dup 3)))]
+  [(pc)]
 {
   if (rs6000_emit_set_const (operands[0], operands[1]))
     DONE;