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? 2023-03-03 Jakub Jelinek <ja...@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