[gcc r13-6441] gimple-fold: Fix up fputs -> fwrite folding [PR108988]

[Jakub Jelinek <jakub@gcc.gnu.org>]

https://gcc.gnu.org/g:dbeccab7a1f5dcc1876c854f17816047ba1ef137

commit r13-6441-gdbeccab7a1f5dcc1876c854f17816047ba1ef137
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Mar 3 11:13:40 2023 +0100

    gimple-fold: Fix up fputs -> fwrite folding [PR108988]
    
    gimple_fold_builtin_fputs when folding fputs into fwrite emits the third
    argument (INTEGER_CST) with incorrect type - get_maxval_strlen or c_strlen
    return ssizetype, while fwrite argument is size_type_node.
    The following patch fixes that, I've skimmed through the rest of
    gimple-fold.cc and in all other places get_maxval_strlen/c_strlen result
    was fold_converted to size_type_node already (or GIMPLE cast stmt has been
    emitted directly etc.).
    
    2023-03-03  Jakub Jelinek  <jakub@redhat.com>
    
            PR tree-optimization/108988
            * gimple-fold.cc (gimple_fold_builtin_fputs): Fold len to
            size_type_node before passing it as argument to fwrite.  Formatting
            fixes.

Diff:
---
 gcc/gimple-fold.cc | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/gcc/gimple-fold.cc b/gcc/gimple-fold.cc
index f2b3e4bebc3..2b6855d1205 100644
--- a/gcc/gimple-fold.cc
+++ b/gcc/gimple-fold.cc
@@ -2954,8 +2954,7 @@ gimple_fold_builtin_fputs (gimple_stmt_iterator *gsi,
   /* Get the length of the string passed to fputs.  If the length
      can't be determined, punt.  */
   tree len = get_maxval_strlen (arg0, SRK_STRLEN);
-  if (!len
-      || TREE_CODE (len) != INTEGER_CST)
+  if (!len || TREE_CODE (len) != INTEGER_CST)
     return false;
 
   switch (compare_tree_int (len, 1))
@@ -2972,9 +2971,10 @@ gimple_fold_builtin_fputs (gimple_stmt_iterator *gsi,
 	    if (!fn_fputc)
 	      return false;
 
-	    gimple *repl = gimple_build_call (fn_fputc, 2,
-					     build_int_cst
-					     (integer_type_node, p[0]), arg1);
+	    gimple *repl
+	      = gimple_build_call (fn_fputc, 2,
+				   build_int_cst (integer_type_node, p[0]),
+				   arg1);
 	    replace_call_with_call_and_fold (gsi, repl);
 	    return true;
 	  }
@@ -2990,8 +2990,9 @@ gimple_fold_builtin_fputs (gimple_stmt_iterator *gsi,
 	if (!fn_fwrite)
 	  return false;
 
-	gimple *repl = gimple_build_call (fn_fwrite, 4, arg0,
-					 size_one_node, len, arg1);
+	gimple *repl
+	  = gimple_build_call (fn_fwrite, 4, arg0, size_one_node,
+			       fold_convert (size_type_node, len), arg1);
 	replace_call_with_call_and_fold (gsi, repl);
 	return true;
       }