Re: [PATCH] gimple-fold: Fix up fputs -> fwrite folding [PR108988]

[Richard Biener <rguenther@suse.de>]

On Fri, 3 Mar 2023, Jakub Jelinek wrote:

> Hi!
> 
> 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.).
> 
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

OK.

> 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.
> 
> --- gcc/gimple-fold.cc.jj	2023-02-28 11:38:28.957868160 +0100
> +++ gcc/gimple-fold.cc	2023-03-02 10:34:42.791504589 +0100
> @@ -2954,8 +2954,7 @@ gimple_fold_builtin_fputs (gimple_stmt_i
>    /* 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_i
>  	    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_i
>  	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;
>        }
> 
> 	Jakub
> 
> 

-- 
Richard Biener <rguenther@suse.de>
SUSE Software Solutions Germany GmbH, Frankenstrasse 146, 90461 Nuernberg,
Germany; GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman;
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