[gcc r16-1286] cselim: Move else_vdef definition to the usage

[Andrew Pinski]

https://gcc.gnu.org/g:31b724864467d82888994b15b266c53db3f991d6

commit r16-1286-g31b724864467d82888994b15b266c53db3f991d6
Author: Andrew Pinski <quic_apinski@quicinc.com>
Date:   Sun Jun 8 13:01:41 2025 -0700

    cselim: Move else_vdef definition to the usage
    
    This is based on the review of cond_if_else_store_replacement_limited
    (https://gcc.gnu.org/pipermail/gcc-patches/2025-June/686076.html).
    
    Moves else_vdef definition/assignment to be next to the usage in
    single_trailing_store_in_bb.
    
    Pushed as obvious after test on x86_64-linux-gnu.
    
    gcc/ChangeLog:
    
            * tree-ssa-phiopt.cc (cond_if_else_store_replacement): Move
            definitin of else_vdef to right before the usage. Reformat
            slightly.
    
    Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

Diff:
---
 gcc/tree-ssa-phiopt.cc | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/gcc/tree-ssa-phiopt.cc b/gcc/tree-ssa-phiopt.cc
index c4e05966924f..faecab6ab7aa 100644
--- a/gcc/tree-ssa-phiopt.cc
+++ b/gcc/tree-ssa-phiopt.cc
@@ -3823,14 +3823,16 @@ cond_if_else_store_replacement (basic_block then_bb, basic_block else_bb,
   if (!vphi)
     return false;
   tree then_vdef = PHI_ARG_DEF_FROM_EDGE (vphi, single_succ_edge (then_bb));
-  tree else_vdef = PHI_ARG_DEF_FROM_EDGE (vphi, single_succ_edge (else_bb));
   gimple *then_assign = single_trailing_store_in_bb (then_bb, then_vdef, vphi);
   if (then_assign)
     {
-      gimple *else_assign = single_trailing_store_in_bb (else_bb, else_vdef, vphi);
+      tree else_vdef = PHI_ARG_DEF_FROM_EDGE (vphi, single_succ_edge (else_bb));
+      gimple *else_assign = single_trailing_store_in_bb (else_bb, else_vdef,
+							 vphi);
       if (else_assign)
 	return cond_if_else_store_replacement_1 (then_bb, else_bb, join_bb,
-						 then_assign, else_assign, vphi);
+						 then_assign, else_assign,
+						 vphi);
     }
 
   /* If either vectorization or if-conversion is disabled then do