[gcc r13-2532] rs6000: allow constant splitter run in split1 pass

[gcc r13-2532] rs6000: allow constant splitter run in split1 pass

[Jiu Fu Guo]

https://gcc.gnu.org/g:fbb550359beb904f00f22b86b64a47313c0ae45a

commit r13-2532-gfbb550359beb904f00f22b86b64a47313c0ae45a
Author: Jiufu Guo <guojiufu@linux.ibm.com>
Date:   Thu Sep 8 13:55:53 2022 +0800

    rs6000: allow constant splitter run in split1 pass
    
    Currently, these two splitters (touched in this patch) are using predicate
    `int_reg_operand_not_pseudo`, then they work in split2 pass after RA in
    most times, and can not run before RA.
    
    It would not be a bad idea to allow these splitters before RA.  Then more
    passes (e.g. combine, sched...) could optimize the emitted instructions.
    
    And if splitting before RA, for current constant splitter, we may have more
    freedom to create pseduo to help to generate more parallel instructions.
    For the example in the leading patch [PATCH 1/2]: pli+plit+rldimi would be
    better than pli+sldi+paddi.
    
    Test this patch with spec, we could see performance gain some times; while
    the improvement is not stable and woud caused by the patch indirectly.
    
    gcc/ChangeLog:
    
            * config/rs6000/rs6000.md (splitter for set to and_mask constants):
            Use int_reg_operand (instead of int_reg_operand_not_pseudo).
            (splitter for multi-insn constant loads): Ditto.

Diff:
---
 gcc/config/rs6000/rs6000.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 959fad23091..ad5a4cf2ef8 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -9683,7 +9683,7 @@
 ; Some DImode loads are best done as a load of -1 followed by a mask
 ; instruction.
 (define_split
-  [(set (match_operand:DI 0 "int_reg_operand_not_pseudo")
+  [(set (match_operand:DI 0 "int_reg_operand")
 	(match_operand:DI 1 "const_int_operand"))]
   "TARGET_POWERPC64
    && num_insns_constant (operands[1], DImode) > 1
@@ -9701,7 +9701,7 @@
 ;; When non-easy constants can go in the TOC, this should use
 ;; easy_fp_constant predicate.
 (define_split
-  [(set (match_operand:DI 0 "int_reg_operand_not_pseudo")
+  [(set (match_operand:DI 0 "int_reg_operand")
 	(match_operand:DI 1 "const_int_operand"))]
   "TARGET_POWERPC64 && num_insns_constant (operands[1], DImode) > 1"
   [(pc)]