[gcc r13-2507] rs6000: remove unused splitter on const_scalar_int_operand

[gcc r13-2507] rs6000: remove unused splitter on const_scalar_int_operand

[Jiu Fu Guo]

https://gcc.gnu.org/g:ea6e89e07f4223c8ac7877508c62bba368084999

commit r13-2507-gea6e89e07f4223c8ac7877508c62bba368084999
Author: Jiufu Guo <guojiufu@linux.ibm.com>
Date:   Wed Sep 7 13:32:55 2022 +0800

    rs6000: remove unused splitter on const_scalar_int_operand
    
    There are two splitters, both are calling rs6000_emit_set_const to emit
    instructions for constant building.
    One splitter checks `const_int_operand`, this splitter is always used.
    Another spitter checks `const_scalar_int_operand`, this one is never
    used now.
    
    Checking the history, that splitter is introduced around 1999 for
    HOST_BITS_PER_WIDE_INT=32, as below:
    
    (define_split
      [(set (match_operand:DI 0 "gpc_reg_operand" "")
            (match_operand:DI 1 "const_double_operand" ""))]
      "HOST_BITS_PER_WIDE_INT == 32 && TARGET_POWERPC64
       && num_insns_constant (operands[1], DImode) > 1"
    
    And `HOST_BITS_PER_WIDE_INT == 32` is eliminated later, since it is
    `const_double_operand` can cover it.
    When wide_int is introduced, `const_double_operand` is replaced by
    `const_scalar_int_operand`.
    
    Now, HOST_BITS_PER_WIDE_INT is forced to 64, this splitter is safe
    to remove.
    
    gcc/ChangeLog:
    
            * config/rs6000/rs6000.md (const_scalar_int splitter): Remove.

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

diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 85b97389d82..959fad23091 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -9712,18 +9712,6 @@
     FAIL;
 })
 
-(define_split
-  [(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"
-  [(pc)]
-{
-  if (rs6000_emit_set_const (operands[0], operands[1]))
-    DONE;
-  else
-    FAIL;
-})
-
 (define_split
   [(set (match_operand:DI 0 "altivec_register_operand")
 	(match_operand:DI 1 "s5bit_cint_operand"))]