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/* Support routines for range operations on wide ints.
Copyright (C) 2018-2019 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_WIDE_INT_RANGE_H
#define GCC_WIDE_INT_RANGE_H
extern bool wide_int_range_cross_product (wide_int &res_lb, wide_int &res_ub,
enum tree_code code, signop sign,
const wide_int &, const wide_int &,
const wide_int &, const wide_int &,
bool overflow_undefined);
extern bool wide_int_range_mult_wrapping (wide_int &res_lb,
wide_int &res_ub,
signop sign,
unsigned prec,
const wide_int &min0_,
const wide_int &max0_,
const wide_int &min1_,
const wide_int &max1_);
extern bool wide_int_range_multiplicative_op (wide_int &res_lb,
wide_int &res_ub,
enum tree_code code,
signop sign,
unsigned prec,
const wide_int &vr0_lb,
const wide_int &vr0_ub,
const wide_int &vr1_lb,
const wide_int &vr1_ub,
bool overflow_undefined);
extern bool wide_int_range_lshift (wide_int &res_lb, wide_int &res_ub,
signop sign, unsigned prec,
const wide_int &, const wide_int &,
const wide_int &, const wide_int &,
bool overflow_undefined);
extern void wide_int_range_set_zero_nonzero_bits (signop,
const wide_int &lb,
const wide_int &ub,
wide_int &may_be_nonzero,
wide_int &must_be_nonzero);
extern bool wide_int_range_optimize_bit_op (wide_int &res_lb, wide_int &res_ub,
enum tree_code code,
signop sign,
const wide_int &vr0_lb,
const wide_int &vr0_ub,
const wide_int &vr1_lb,
const wide_int &vr1_ub);
extern bool wide_int_range_get_mask_and_bounds (wide_int &mask,
wide_int &lower_bound,
wide_int &upper_bound,
const wide_int &vr0_min,
const wide_int &vr0_max,
const wide_int &vr1_min,
const wide_int &vr1_max);
extern bool wide_int_range_bit_xor (wide_int &wmin, wide_int &wmax,
signop sign,
unsigned prec,
const wide_int &must_be_nonzero0,
const wide_int &may_be_nonzero0,
const wide_int &must_be_nonzero1,
const wide_int &may_be_nonzero1);
extern bool wide_int_range_bit_ior (wide_int &wmin, wide_int &wmax,
signop sign,
const wide_int &vr0_min,
const wide_int &vr0_max,
const wide_int &vr1_min,
const wide_int &vr1_max,
const wide_int &must_be_nonzero0,
const wide_int &may_be_nonzero0,
const wide_int &must_be_nonzero1,
const wide_int &may_be_nonzero1);
extern bool wide_int_range_bit_and (wide_int &wmin, wide_int &wmax,
signop sign,
unsigned prec,
const wide_int &vr0_min,
const wide_int &vr0_max,
const wide_int &vr1_min,
const wide_int &vr1_max,
const wide_int &must_be_nonzero0,
const wide_int &may_be_nonzero0,
const wide_int &must_be_nonzero1,
const wide_int &may_be_nonzero1);
extern void wide_int_range_trunc_mod (wide_int &wmin, wide_int &wmax,
signop sign,
unsigned prec,
const wide_int &vr0_min,
const wide_int &vr0_max,
const wide_int &vr1_min,
const wide_int &vr1_max);
extern bool wide_int_range_abs (wide_int &min, wide_int &max,
signop sign, unsigned prec,
const wide_int &vr0_min,
const wide_int &vr0_max,
bool overflow_undefined);
extern bool wide_int_range_convert (wide_int &min, wide_int &max,
signop inner_sign,
unsigned inner_prec,
signop outer_sign,
unsigned outer_prec,
const wide_int &vr0_min,
const wide_int &vr0_max);
extern bool wide_int_range_div (wide_int &wmin, wide_int &wmax,
enum tree_code code,
signop sign, unsigned prec,
const wide_int ÷nd_min,
const wide_int ÷nd_max,
const wide_int &divisor_min,
const wide_int &divisor_max,
bool overflow_undefined,
bool &extra_range_p,
wide_int &extra_min, wide_int &extra_max);
/* Return TRUE if shifting by range [MIN, MAX] is undefined behavior,
interpreting MIN and MAX according to SIGN. */
inline bool
wide_int_range_shift_undefined_p (signop sign, unsigned prec,
const wide_int &min, const wide_int &max)
{
/* ?? Note: The original comment said this only applied to
RSHIFT_EXPR, but it was being applied to both left and right
shifts. */
/* Shifting by any values outside [0..prec-1], gets undefined
behavior from the shift operation. We cannot even trust
SHIFT_COUNT_TRUNCATED at this stage, because that applies to rtl
shifts, and the operation at the tree level may be widened. */
return wi::lt_p (min, 0, sign) || wi::ge_p (max, prec, sign);
}
/* Calculate MIN/MAX_EXPR of two ranges and store the result in [MIN, MAX]. */
inline bool
wide_int_range_min_max (wide_int &min, wide_int &max,
tree_code code,
signop sign, unsigned prec,
const wide_int &vr0_min, const wide_int &vr0_max,
const wide_int &vr1_min, const wide_int &vr1_max)
{
wi::overflow_type overflow;
wide_int_binop (min, code, vr0_min, vr1_min, sign, &overflow);
wide_int_binop (max, code, vr0_max, vr1_max, sign, &overflow);
/* If the new range covers the entire domain, that's really no range
at all. */
if (min == wi::min_value (prec, sign)
&& max == wi::max_value (prec, sign))
return false;
return true;
}
/* Return TRUE if 0 is within [WMIN, WMAX]. */
inline bool
wide_int_range_includes_zero_p (const wide_int &wmin, const wide_int &wmax,
signop sign)
{
return wi::le_p (wmin, 0, sign) && wi::ge_p (wmax, 0, sign);
}
/* Return TRUE if [WMIN, WMAX] is the singleton 0. */
inline bool
wide_int_range_zero_p (const wide_int &wmin, const wide_int &wmax,
unsigned prec)
{
return wmin == wmax && wi::eq_p (wmin, wi::zero (prec));
}
#endif /* GCC_WIDE_INT_RANGE_H */
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