/* Support for fully folding sub-trees of an expression for C compiler.
- Copyright (C) 1992-2018 Free Software Foundation, Inc.
+ Copyright (C) 1992-2021 Free Software Foundation, Inc.
This file is part of GCC.
tree orig_op0, orig_op1, orig_op2;
bool op0_const = true, op1_const = true, op2_const = true;
bool op0_const_self = true, op1_const_self = true, op2_const_self = true;
- bool nowarning = TREE_NO_WARNING (expr);
+ bool nowarning = warning_suppressed_p (expr, OPT_Woverflow);
bool unused_p;
bool op0_lval = false;
source_range old_range;
case UNGT_EXPR:
case UNGE_EXPR:
case UNEQ_EXPR:
+ case MEM_REF:
/* Binary operations evaluating both arguments (increment and
decrement are binary internally in GCC). */
orig_op0 = op0 = TREE_OPERAND (expr, 0);
ret = fold (expr);
if (TREE_OVERFLOW_P (ret)
&& !TREE_OVERFLOW_P (op0)
+ && !(BINARY_CLASS_P (op0) && TREE_OVERFLOW_P (TREE_OPERAND (op0, 1)))
&& !TREE_OVERFLOW_P (op1))
overflow_warning (EXPR_LOC_OR_LOC (expr, input_location), ret, expr);
if (code == LSHIFT_EXPR
|| TREE_CODE (TREE_TYPE (orig_op0)) == FIXED_POINT_TYPE)
&& TREE_CODE (TREE_TYPE (orig_op1)) == INTEGER_TYPE)
warn_for_div_by_zero (loc, op1);
+ if (code == MEM_REF
+ && ret != expr
+ && TREE_CODE (ret) == MEM_REF)
+ {
+ TREE_READONLY (ret) = TREE_READONLY (expr);
+ TREE_SIDE_EFFECTS (ret) = TREE_SIDE_EFFECTS (expr);
+ TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr);
+ }
goto out;
case ADDR_EXPR:
&& (op1 = get_base_address (op0)) != NULL_TREE
&& INDIRECT_REF_P (op1)
&& TREE_CONSTANT (TREE_OPERAND (op1, 0)))
- ret = fold_convert_loc (loc, TREE_TYPE (expr), fold_offsetof_1 (op0));
+ ret = fold_offsetof (op0, TREE_TYPE (expr));
else if (op0 != orig_op0 || in_init)
ret = in_init
? fold_build1_initializer_loc (loc, code, TREE_TYPE (expr), op0)
out:
/* Some folding may introduce NON_LVALUE_EXPRs; all lvalue checks
have been done by this point, so remove them again. */
- nowarning |= TREE_NO_WARNING (ret);
+ nowarning |= warning_suppressed_p (ret, OPT_Woverflow);
STRIP_TYPE_NOPS (ret);
- if (nowarning && !TREE_NO_WARNING (ret))
+ if (nowarning && !warning_suppressed_p (ret, OPT_Woverflow))
{
if (!CAN_HAVE_LOCATION_P (ret))
ret = build1 (NOP_EXPR, TREE_TYPE (ret), ret);
- TREE_NO_WARNING (ret) = 1;
+ suppress_warning (ret, OPT_Woverflow);
}
if (ret != expr)
{