/* Operations with long integers.
- Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
-
+ Copyright (C) 2006-2020 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 DOUBLE_INT_H
#define DOUBLE_INT_H
-#ifndef GENERATOR_FILE
-#include <gmp.h>
-#endif
-#include "coretypes.h"
-
/* A large integer is currently represented as a pair of HOST_WIDE_INTs.
It therefore represents a number with precision of
2 * HOST_BITS_PER_WIDE_INT bits (it is however possible that the
numbers with precision higher than HOST_WIDE_INT). It might be less
confusing to have them both signed or both unsigned. */
-typedef struct
+struct double_int
{
+ /* Normally, we would define constructors to create instances.
+ Two things prevent us from doing so.
+ First, defining a constructor makes the class non-POD in C++03,
+ and we certainly want double_int to be a POD.
+ Second, the GCC conding conventions prefer explicit conversion,
+ and explicit conversion operators are not available until C++11. */
+
+ static double_int from_uhwi (unsigned HOST_WIDE_INT cst);
+ static double_int from_shwi (HOST_WIDE_INT cst);
+ static double_int from_pair (HOST_WIDE_INT high, unsigned HOST_WIDE_INT low);
+
+ /* Construct from a fuffer of length LEN. BUFFER will be read according
+ to byte endianness and word endianness. */
+ static double_int from_buffer (const unsigned char *buffer, int len);
+
+ /* No copy assignment operator or destructor to keep the type a POD. */
+
+ /* There are some special value-creation static member functions. */
+
+ static double_int mask (unsigned prec);
+ static double_int max_value (unsigned int prec, bool uns);
+ static double_int min_value (unsigned int prec, bool uns);
+
+ /* The following functions are mutating operations. */
+
+ double_int &operator ++ (); // prefix
+ double_int &operator -- (); // prefix
+ double_int &operator *= (double_int);
+ double_int &operator += (double_int);
+ double_int &operator -= (double_int);
+ double_int &operator &= (double_int);
+ double_int &operator ^= (double_int);
+ double_int &operator |= (double_int);
+
+ /* The following functions are non-mutating operations. */
+
+ /* Conversion functions. */
+
+ HOST_WIDE_INT to_shwi () const;
+ unsigned HOST_WIDE_INT to_uhwi () const;
+
+ /* Conversion query functions. */
+
+ bool fits_uhwi () const;
+ bool fits_shwi () const;
+ bool fits_hwi (bool uns) const;
+
+ /* Attribute query functions. */
+
+ int trailing_zeros () const;
+ int popcount () const;
+
+ /* Arithmetic query operations. */
+
+ bool multiple_of (double_int, bool, double_int *) const;
+
+ /* Arithmetic operation functions. */
+
+ /* The following operations perform arithmetics modulo 2^precision, so you
+ do not need to call .ext between them, even if you are representing
+ numbers with precision less than HOST_BITS_PER_DOUBLE_INT bits. */
+
+ double_int set_bit (unsigned) const;
+ double_int mul_with_sign (double_int, bool unsigned_p, bool *overflow) const;
+ double_int wide_mul_with_sign (double_int, bool unsigned_p,
+ double_int *higher, bool *overflow) const;
+ double_int add_with_sign (double_int, bool unsigned_p, bool *overflow) const;
+ double_int sub_with_overflow (double_int, bool *overflow) const;
+ double_int neg_with_overflow (bool *overflow) const;
+
+ double_int operator * (double_int) const;
+ double_int operator + (double_int) const;
+ double_int operator - (double_int) const;
+ double_int operator - () const;
+ double_int operator ~ () const;
+ double_int operator & (double_int) const;
+ double_int operator | (double_int) const;
+ double_int operator ^ (double_int) const;
+ double_int and_not (double_int) const;
+
+ double_int lshift (HOST_WIDE_INT count) const;
+ double_int lshift (HOST_WIDE_INT count, unsigned int prec, bool arith) const;
+ double_int rshift (HOST_WIDE_INT count) const;
+ double_int rshift (HOST_WIDE_INT count, unsigned int prec, bool arith) const;
+ double_int alshift (HOST_WIDE_INT count, unsigned int prec) const;
+ double_int arshift (HOST_WIDE_INT count, unsigned int prec) const;
+ double_int llshift (HOST_WIDE_INT count, unsigned int prec) const;
+ double_int lrshift (HOST_WIDE_INT count, unsigned int prec) const;
+ double_int lrotate (HOST_WIDE_INT count, unsigned int prec) const;
+ double_int rrotate (HOST_WIDE_INT count, unsigned int prec) const;
+
+ /* You must ensure that double_int::ext is called on the operands
+ of the following operations, if the precision of the numbers
+ is less than HOST_BITS_PER_DOUBLE_INT bits. */
+
+ double_int div (double_int, bool, unsigned) const;
+ double_int sdiv (double_int, unsigned) const;
+ double_int udiv (double_int, unsigned) const;
+ double_int mod (double_int, bool, unsigned) const;
+ double_int smod (double_int, unsigned) const;
+ double_int umod (double_int, unsigned) const;
+ double_int divmod_with_overflow (double_int, bool, unsigned,
+ double_int *, bool *) const;
+ double_int divmod (double_int, bool, unsigned, double_int *) const;
+ double_int sdivmod (double_int, unsigned, double_int *) const;
+ double_int udivmod (double_int, unsigned, double_int *) const;
+
+ /* Precision control functions. */
+
+ double_int ext (unsigned prec, bool uns) const;
+ double_int zext (unsigned prec) const;
+ double_int sext (unsigned prec) const;
+
+ /* Comparative functions. */
+
+ bool is_zero () const;
+ bool is_one () const;
+ bool is_minus_one () const;
+ bool is_negative () const;
+
+ int cmp (double_int b, bool uns) const;
+ int ucmp (double_int b) const;
+ int scmp (double_int b) const;
+
+ bool ult (double_int b) const;
+ bool ule (double_int b) const;
+ bool ugt (double_int b) const;
+ bool slt (double_int b) const;
+ bool sle (double_int b) const;
+ bool sgt (double_int b) const;
+
+ double_int max (double_int b, bool uns);
+ double_int smax (double_int b);
+ double_int umax (double_int b);
+
+ double_int min (double_int b, bool uns);
+ double_int smin (double_int b);
+ double_int umin (double_int b);
+
+ bool operator == (double_int cst2) const;
+ bool operator != (double_int cst2) const;
+
+ /* Please migrate away from using these member variables publicly. */
+
unsigned HOST_WIDE_INT low;
HOST_WIDE_INT high;
-} double_int;
-union tree_node;
+};
-/* Constructors and conversions. */
+#define HOST_BITS_PER_DOUBLE_INT (2 * HOST_BITS_PER_WIDE_INT)
-union tree_node *double_int_to_tree (union tree_node *, double_int);
-bool double_int_fits_to_tree_p (const union tree_node *, double_int);
-double_int tree_to_double_int (const union tree_node *);
+/* Constructors and conversions. */
/* Constructs double_int from integer CST. The bits over the precision of
HOST_WIDE_INT are filled with the sign bit. */
-static inline double_int
-shwi_to_double_int (HOST_WIDE_INT cst)
+inline double_int
+double_int::from_shwi (HOST_WIDE_INT cst)
{
double_int r;
-
r.low = (unsigned HOST_WIDE_INT) cst;
r.high = cst < 0 ? -1 : 0;
-
return r;
}
/* Some useful constants. */
+/* FIXME(crowl): Maybe remove after converting callers?
+ The problem is that a named constant would not be as optimizable,
+ while the functional syntax is more verbose. */
-#define double_int_minus_one (shwi_to_double_int (-1))
-#define double_int_zero (shwi_to_double_int (0))
-#define double_int_one (shwi_to_double_int (1))
-#define double_int_two (shwi_to_double_int (2))
-#define double_int_ten (shwi_to_double_int (10))
+#define double_int_minus_one (double_int::from_shwi (-1))
+#define double_int_zero (double_int::from_shwi (0))
+#define double_int_one (double_int::from_shwi (1))
+#define double_int_two (double_int::from_shwi (2))
+#define double_int_ten (double_int::from_shwi (10))
/* Constructs double_int from unsigned integer CST. The bits over the
precision of HOST_WIDE_INT are filled with zeros. */
-static inline double_int
-uhwi_to_double_int (unsigned HOST_WIDE_INT cst)
+inline double_int
+double_int::from_uhwi (unsigned HOST_WIDE_INT cst)
{
double_int r;
-
r.low = cst;
r.high = 0;
+ return r;
+}
+inline double_int
+double_int::from_pair (HOST_WIDE_INT high, unsigned HOST_WIDE_INT low)
+{
+ double_int r;
+ r.low = low;
+ r.high = high;
return r;
}
-/* The following operations perform arithmetics modulo 2^precision,
- so you do not need to call double_int_ext between them, even if
- you are representing numbers with precision less than
- 2 * HOST_BITS_PER_WIDE_INT bits. */
-
-double_int double_int_mul (double_int, double_int);
-double_int double_int_add (double_int, double_int);
-double_int double_int_neg (double_int);
-
-/* You must ensure that double_int_ext is called on the operands
- of the following operations, if the precision of the numbers
- is less than 2 * HOST_BITS_PER_WIDE_INT bits. */
-bool double_int_fits_in_hwi_p (double_int, bool);
-bool double_int_fits_in_shwi_p (double_int);
-bool double_int_fits_in_uhwi_p (double_int);
-HOST_WIDE_INT double_int_to_shwi (double_int);
-unsigned HOST_WIDE_INT double_int_to_uhwi (double_int);
-double_int double_int_div (double_int, double_int, bool, unsigned);
-double_int double_int_sdiv (double_int, double_int, unsigned);
-double_int double_int_udiv (double_int, double_int, unsigned);
-double_int double_int_mod (double_int, double_int, bool, unsigned);
-double_int double_int_smod (double_int, double_int, unsigned);
-double_int double_int_umod (double_int, double_int, unsigned);
-double_int double_int_divmod (double_int, double_int, bool, unsigned, double_int *);
-double_int double_int_sdivmod (double_int, double_int, unsigned, double_int *);
-double_int double_int_udivmod (double_int, double_int, unsigned, double_int *);
-bool double_int_negative_p (double_int);
-int double_int_cmp (double_int, double_int, bool);
-int double_int_scmp (double_int, double_int);
-int double_int_ucmp (double_int, double_int);
-void dump_double_int (FILE *, double_int, bool);
+inline double_int &
+double_int::operator ++ ()
+{
+ *this += double_int_one;
+ return *this;
+}
+
+inline double_int &
+double_int::operator -- ()
+{
+ *this -= double_int_one;
+ return *this;
+}
+
+inline double_int &
+double_int::operator &= (double_int b)
+{
+ *this = *this & b;
+ return *this;
+}
+
+inline double_int &
+double_int::operator ^= (double_int b)
+{
+ *this = *this ^ b;
+ return *this;
+}
+
+inline double_int &
+double_int::operator |= (double_int b)
+{
+ *this = *this | b;
+ return *this;
+}
+
+/* Returns value of CST as a signed number. CST must satisfy
+ double_int::fits_signed. */
-/* Zero and sign extension of numbers in smaller precisions. */
+inline HOST_WIDE_INT
+double_int::to_shwi () const
+{
+ return (HOST_WIDE_INT) low;
+}
+
+/* Returns value of CST as an unsigned number. CST must satisfy
+ double_int::fits_unsigned. */
-double_int double_int_ext (double_int, unsigned, bool);
-double_int double_int_sext (double_int, unsigned);
-double_int double_int_zext (double_int, unsigned);
-double_int double_int_mask (unsigned);
+inline unsigned HOST_WIDE_INT
+double_int::to_uhwi () const
+{
+ return low;
+}
-#define ALL_ONES (~((unsigned HOST_WIDE_INT) 0))
+/* Returns true if CST fits in unsigned HOST_WIDE_INT. */
+
+inline bool
+double_int::fits_uhwi () const
+{
+ return high == 0;
+}
+
+/* Logical operations. */
+
+/* Returns ~A. */
+
+inline double_int
+double_int::operator ~ () const
+{
+ double_int result;
+ result.low = ~low;
+ result.high = ~high;
+ return result;
+}
+
+/* Returns A | B. */
+
+inline double_int
+double_int::operator | (double_int b) const
+{
+ double_int result;
+ result.low = low | b.low;
+ result.high = high | b.high;
+ return result;
+}
+
+/* Returns A & B. */
+
+inline double_int
+double_int::operator & (double_int b) const
+{
+ double_int result;
+ result.low = low & b.low;
+ result.high = high & b.high;
+ return result;
+}
+
+/* Returns A & ~B. */
+
+inline double_int
+double_int::and_not (double_int b) const
+{
+ double_int result;
+ result.low = low & ~b.low;
+ result.high = high & ~b.high;
+ return result;
+}
+
+/* Returns A ^ B. */
+
+inline double_int
+double_int::operator ^ (double_int b) const
+{
+ double_int result;
+ result.low = low ^ b.low;
+ result.high = high ^ b.high;
+ return result;
+}
+
+void dump_double_int (FILE *, double_int, bool);
+
+#define ALL_ONES HOST_WIDE_INT_M1U
/* The operands of the following comparison functions must be processed
with double_int_ext, if their precision is less than
- 2 * HOST_BITS_PER_WIDE_INT bits. */
+ HOST_BITS_PER_DOUBLE_INT bits. */
/* Returns true if CST is zero. */
-static inline bool
-double_int_zero_p (double_int cst)
+inline bool
+double_int::is_zero () const
{
- return cst.low == 0 && cst.high == 0;
+ return low == 0 && high == 0;
}
/* Returns true if CST is one. */
-static inline bool
-double_int_one_p (double_int cst)
+inline bool
+double_int::is_one () const
{
- return cst.low == 1 && cst.high == 0;
+ return low == 1 && high == 0;
}
/* Returns true if CST is minus one. */
-static inline bool
-double_int_minus_one_p (double_int cst)
+inline bool
+double_int::is_minus_one () const
{
- return (cst.low == ALL_ONES && cst.high == -1);
+ return low == ALL_ONES && high == -1;
+}
+
+/* Returns true if CST is negative. */
+
+inline bool
+double_int::is_negative () const
+{
+ return high < 0;
}
/* Returns true if CST1 == CST2. */
-static inline bool
-double_int_equal_p (double_int cst1, double_int cst2)
+inline bool
+double_int::operator == (double_int cst2) const
+{
+ return low == cst2.low && high == cst2.high;
+}
+
+/* Returns true if CST1 != CST2. */
+
+inline bool
+double_int::operator != (double_int cst2) const
+{
+ return low != cst2.low || high != cst2.high;
+}
+
+/* Return number of set bits of CST. */
+
+inline int
+double_int::popcount () const
{
- return cst1.low == cst2.low && cst1.high == cst2.high;
+ return popcount_hwi (high) + popcount_hwi (low);
}
+
#ifndef GENERATOR_FILE
/* Conversion to and from GMP integer representations. */
double_int mpz_get_double_int (const_tree, mpz_t, bool);
#endif
+namespace wi
+{
+ template <>
+ struct int_traits <double_int>
+ {
+ static const enum precision_type precision_type = CONST_PRECISION;
+ static const bool host_dependent_precision = true;
+ static const unsigned int precision = HOST_BITS_PER_DOUBLE_INT;
+ static unsigned int get_precision (const double_int &);
+ static wi::storage_ref decompose (HOST_WIDE_INT *, unsigned int,
+ const double_int &);
+ };
+}
+
+inline unsigned int
+wi::int_traits <double_int>::get_precision (const double_int &)
+{
+ return precision;
+}
+
+inline wi::storage_ref
+wi::int_traits <double_int>::decompose (HOST_WIDE_INT *scratch, unsigned int p,
+ const double_int &x)
+{
+ gcc_checking_assert (precision == p);
+ scratch[0] = x.low;
+ if ((x.high == 0 && scratch[0] >= 0) || (x.high == -1 && scratch[0] < 0))
+ return wi::storage_ref (scratch, 1, precision);
+ scratch[1] = x.high;
+ return wi::storage_ref (scratch, 2, precision);
+}
+
#endif /* DOUBLE_INT_H */
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