[gcc r12-8229] fortran: Generate an array temporary reference [PR102043]

[Mikael Morin <mikael@gcc.gnu.org>]

https://gcc.gnu.org/g:761dda57482295f9c41fcf87e5defa2ac1959f03

commit r12-8229-g761dda57482295f9c41fcf87e5defa2ac1959f03
Author: Mikael Morin <mikael@gcc.gnu.org>
Date:   Fri Apr 22 22:52:38 2022 +0200

    fortran: Generate an array temporary reference [PR102043]
    
    This avoids regressing on char_cast_1.f90 and char_cast_2.f90 later in
    the patch series when the code generation for array references is
    changed to use pointer arithmetic.
    
    The regressing testcases match part of an array reference in the
    generated tree dump and it’s not clear how the pattern should be
    rewritten to match the equivalent with pointer arithmetic.
    
    This change uses a method specific to array temporaries to generate
    array-references, so that these array references are flagged as safe
    for array indexing and will not be updated to use pointer arithmetic.
    
            PR fortran/102043
    
    gcc/fortran/ChangeLog:
            * trans-array.cc (gfc_conv_expr_descriptor): Use
            gfc_conv_tmp_array_ref.

Diff:
---
 gcc/fortran/trans-array.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/fortran/trans-array.cc b/gcc/fortran/trans-array.cc
index b3f8871ff22..11e47c0c1ca 100644
--- a/gcc/fortran/trans-array.cc
+++ b/gcc/fortran/trans-array.cc
@@ -7723,7 +7723,7 @@ gfc_conv_expr_descriptor (gfc_se *se, gfc_expr *expr)
       lse.ss = loop.temp_ss;
       rse.ss = ss;
 
-      gfc_conv_scalarized_array_ref (&lse, NULL);
+      gfc_conv_tmp_array_ref (&lse);
       if (expr->ts.type == BT_CHARACTER)
 	{
 	  gfc_conv_expr (&rse, expr);