[gcc r13-4743] middle-end/108086 - avoid unshare_expr when remapping SSA names

[gcc r13-4743] middle-end/108086 - avoid unshare_expr when remapping SSA names

[Richard Biener]

https://gcc.gnu.org/g:da85bfc75024a92b97e60e4436863dd5789786ec

commit r13-4743-gda85bfc75024a92b97e60e4436863dd5789786ec
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Dec 16 13:01:40 2022 +0100

    middle-end/108086 - avoid unshare_expr when remapping SSA names
    
    r0-89280-g129a37fc319db8 added unsharing to remap_ssa_name but
    that wasn't in the version of the patch posted.  That has some
    non-trivial cost through mostly_copy_tree_r and copy_tree_r but
    more importantly it doesn't seem to be necessary.  I've successfully
    bootstrapped and tested with an assert we only get
    tree_node_can_be_shared trees here.
    
    Bootstrapped and tested on x86_64-unknown-linux-gnu with all
    languages.
    
            PR middle-end/108086
            * tree-inline.cc (remap_ssa_name): Do not unshare the
            result from the decl_map.

Diff:
---
 gcc/tree-inline.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/tree-inline.cc b/gcc/tree-inline.cc
index 9fd971a034c..c6c86af6c4e 100644
--- a/gcc/tree-inline.cc
+++ b/gcc/tree-inline.cc
@@ -183,7 +183,7 @@ remap_ssa_name (tree name, copy_body_data *id)
 	  return name;
 	}
 
-      return unshare_expr (*n);
+      return *n;
     }
 
   if (processing_debug_stmt)