/* Operations with long integers.
- Copyright (C) 2006 Free Software Foundation, Inc.
-
+ Copyright (C) 2006-2015 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 2, or (at your option) any
+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 COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
-#include "tm.h"
+#include "tm.h" /* For BITS_PER_UNIT and *_BIG_ENDIAN. */
+#include "hash-set.h"
+#include "machmode.h"
+#include "vec.h"
+#include "double-int.h"
+#include "input.h"
+#include "alias.h"
+#include "symtab.h"
+#include "wide-int.h"
+#include "inchash.h"
+#include "real.h"
#include "tree.h"
+static int add_double_with_sign (unsigned HOST_WIDE_INT, HOST_WIDE_INT,
+ unsigned HOST_WIDE_INT, HOST_WIDE_INT,
+ unsigned HOST_WIDE_INT *, HOST_WIDE_INT *,
+ bool);
+
+#define add_double(l1,h1,l2,h2,lv,hv) \
+ add_double_with_sign (l1, h1, l2, h2, lv, hv, false)
+
+static int neg_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT,
+ unsigned HOST_WIDE_INT *, HOST_WIDE_INT *);
+
+static int mul_double_wide_with_sign (unsigned HOST_WIDE_INT, HOST_WIDE_INT,
+ unsigned HOST_WIDE_INT, HOST_WIDE_INT,
+ unsigned HOST_WIDE_INT *, HOST_WIDE_INT *,
+ unsigned HOST_WIDE_INT *, HOST_WIDE_INT *,
+ bool);
+
+#define mul_double(l1,h1,l2,h2,lv,hv) \
+ mul_double_wide_with_sign (l1, h1, l2, h2, lv, hv, NULL, NULL, false)
+
+static int div_and_round_double (unsigned, int, unsigned HOST_WIDE_INT,
+ HOST_WIDE_INT, unsigned HOST_WIDE_INT,
+ HOST_WIDE_INT, unsigned HOST_WIDE_INT *,
+ HOST_WIDE_INT *, unsigned HOST_WIDE_INT *,
+ HOST_WIDE_INT *);
+
+/* We know that A1 + B1 = SUM1, using 2's complement arithmetic and ignoring
+ overflow. Suppose A, B and SUM have the same respective signs as A1, B1,
+ and SUM1. Then this yields nonzero if overflow occurred during the
+ addition.
+
+ Overflow occurs if A and B have the same sign, but A and SUM differ in
+ sign. Use `^' to test whether signs differ, and `< 0' to isolate the
+ sign. */
+#define OVERFLOW_SUM_SIGN(a, b, sum) ((~((a) ^ (b)) & ((a) ^ (sum))) < 0)
+
+/* To do constant folding on INTEGER_CST nodes requires two-word arithmetic.
+ We do that by representing the two-word integer in 4 words, with only
+ HOST_BITS_PER_WIDE_INT / 2 bits stored in each word, as a positive
+ number. The value of the word is LOWPART + HIGHPART * BASE. */
+
+#define LOWPART(x) \
+ ((x) & (((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2)) - 1))
+#define HIGHPART(x) \
+ ((unsigned HOST_WIDE_INT) (x) >> HOST_BITS_PER_WIDE_INT / 2)
+#define BASE ((unsigned HOST_WIDE_INT) 1 << HOST_BITS_PER_WIDE_INT / 2)
+
+/* Unpack a two-word integer into 4 words.
+ LOW and HI are the integer, as two `HOST_WIDE_INT' pieces.
+ WORDS points to the array of HOST_WIDE_INTs. */
+
+static void
+encode (HOST_WIDE_INT *words, unsigned HOST_WIDE_INT low, HOST_WIDE_INT hi)
+{
+ words[0] = LOWPART (low);
+ words[1] = HIGHPART (low);
+ words[2] = LOWPART (hi);
+ words[3] = HIGHPART (hi);
+}
+
+/* Pack an array of 4 words into a two-word integer.
+ WORDS points to the array of words.
+ The integer is stored into *LOW and *HI as two `HOST_WIDE_INT' pieces. */
+
+static void
+decode (HOST_WIDE_INT *words, unsigned HOST_WIDE_INT *low,
+ HOST_WIDE_INT *hi)
+{
+ *low = words[0] + words[1] * BASE;
+ *hi = words[2] + words[3] * BASE;
+}
+
+/* Add two doubleword integers with doubleword result.
+ Return nonzero if the operation overflows according to UNSIGNED_P.
+ Each argument is given as two `HOST_WIDE_INT' pieces.
+ One argument is L1 and H1; the other, L2 and H2.
+ The value is stored as two `HOST_WIDE_INT' pieces in *LV and *HV. */
+
+static int
+add_double_with_sign (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ unsigned HOST_WIDE_INT l2, HOST_WIDE_INT h2,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv,
+ bool unsigned_p)
+{
+ unsigned HOST_WIDE_INT l;
+ HOST_WIDE_INT h;
+
+ l = l1 + l2;
+ h = (HOST_WIDE_INT) ((unsigned HOST_WIDE_INT) h1
+ + (unsigned HOST_WIDE_INT) h2
+ + (l < l1));
+
+ *lv = l;
+ *hv = h;
+
+ if (unsigned_p)
+ return ((unsigned HOST_WIDE_INT) h < (unsigned HOST_WIDE_INT) h1
+ || (h == h1
+ && l < l1));
+ else
+ return OVERFLOW_SUM_SIGN (h1, h2, h);
+}
+
+/* Negate a doubleword integer with doubleword result.
+ Return nonzero if the operation overflows, assuming it's signed.
+ The argument is given as two `HOST_WIDE_INT' pieces in L1 and H1.
+ The value is stored as two `HOST_WIDE_INT' pieces in *LV and *HV. */
+
+static int
+neg_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv)
+{
+ if (l1 == 0)
+ {
+ *lv = 0;
+ *hv = - (unsigned HOST_WIDE_INT) h1;
+ return (*hv & h1) < 0;
+ }
+ else
+ {
+ *lv = -l1;
+ *hv = ~h1;
+ return 0;
+ }
+}
+
+/* Multiply two doubleword integers with quadword result.
+ Return nonzero if the operation overflows according to UNSIGNED_P.
+ Each argument is given as two `HOST_WIDE_INT' pieces.
+ One argument is L1 and H1; the other, L2 and H2.
+ The value is stored as four `HOST_WIDE_INT' pieces in *LV and *HV,
+ *LW and *HW.
+ If lw is NULL then only the low part and no overflow is computed. */
+
+static int
+mul_double_wide_with_sign (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ unsigned HOST_WIDE_INT l2, HOST_WIDE_INT h2,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv,
+ unsigned HOST_WIDE_INT *lw, HOST_WIDE_INT *hw,
+ bool unsigned_p)
+{
+ HOST_WIDE_INT arg1[4];
+ HOST_WIDE_INT arg2[4];
+ HOST_WIDE_INT prod[4 * 2];
+ unsigned HOST_WIDE_INT carry;
+ int i, j, k;
+ unsigned HOST_WIDE_INT neglow;
+ HOST_WIDE_INT neghigh;
+
+ encode (arg1, l1, h1);
+ encode (arg2, l2, h2);
+
+ memset (prod, 0, sizeof prod);
+
+ for (i = 0; i < 4; i++)
+ {
+ carry = 0;
+ for (j = 0; j < 4; j++)
+ {
+ k = i + j;
+ /* This product is <= 0xFFFE0001, the sum <= 0xFFFF0000. */
+ carry += (unsigned HOST_WIDE_INT) arg1[i] * arg2[j];
+ /* Since prod[p] < 0xFFFF, this sum <= 0xFFFFFFFF. */
+ carry += prod[k];
+ prod[k] = LOWPART (carry);
+ carry = HIGHPART (carry);
+ }
+ prod[i + 4] = carry;
+ }
+
+ decode (prod, lv, hv);
+
+ /* We are not interested in the wide part nor in overflow. */
+ if (lw == NULL)
+ return 0;
+
+ decode (prod + 4, lw, hw);
+
+ /* Unsigned overflow is immediate. */
+ if (unsigned_p)
+ return (*lw | *hw) != 0;
+
+ /* Check for signed overflow by calculating the signed representation of the
+ top half of the result; it should agree with the low half's sign bit. */
+ if (h1 < 0)
+ {
+ neg_double (l2, h2, &neglow, &neghigh);
+ add_double (neglow, neghigh, *lw, *hw, lw, hw);
+ }
+ if (h2 < 0)
+ {
+ neg_double (l1, h1, &neglow, &neghigh);
+ add_double (neglow, neghigh, *lw, *hw, lw, hw);
+ }
+ return (*hv < 0 ? ~(*lw & *hw) : *lw | *hw) != 0;
+}
+
+/* Shift the doubleword integer in L1, H1 right by COUNT places
+ keeping only PREC bits of result. ARITH nonzero specifies
+ arithmetic shifting; otherwise use logical shift.
+ Store the value as two `HOST_WIDE_INT' pieces in *LV and *HV. */
+
+static void
+rshift_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ unsigned HOST_WIDE_INT count, unsigned int prec,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv,
+ bool arith)
+{
+ unsigned HOST_WIDE_INT signmask;
+
+ signmask = (arith
+ ? -((unsigned HOST_WIDE_INT) h1 >> (HOST_BITS_PER_WIDE_INT - 1))
+ : 0);
+
+ if (count >= HOST_BITS_PER_DOUBLE_INT)
+ {
+ /* Shifting by the host word size is undefined according to the
+ ANSI standard, so we must handle this as a special case. */
+ *hv = 0;
+ *lv = 0;
+ }
+ else if (count >= HOST_BITS_PER_WIDE_INT)
+ {
+ *hv = 0;
+ *lv = (unsigned HOST_WIDE_INT) h1 >> (count - HOST_BITS_PER_WIDE_INT);
+ }
+ else
+ {
+ *hv = (unsigned HOST_WIDE_INT) h1 >> count;
+ *lv = ((l1 >> count)
+ | ((unsigned HOST_WIDE_INT) h1
+ << (HOST_BITS_PER_WIDE_INT - count - 1) << 1));
+ }
+
+ /* Zero / sign extend all bits that are beyond the precision. */
+
+ if (count >= prec)
+ {
+ *hv = signmask;
+ *lv = signmask;
+ }
+ else if ((prec - count) >= HOST_BITS_PER_DOUBLE_INT)
+ ;
+ else if ((prec - count) >= HOST_BITS_PER_WIDE_INT)
+ {
+ *hv &= ~(HOST_WIDE_INT_M1U << (prec - count - HOST_BITS_PER_WIDE_INT));
+ *hv |= signmask << (prec - count - HOST_BITS_PER_WIDE_INT);
+ }
+ else
+ {
+ *hv = signmask;
+ *lv &= ~(HOST_WIDE_INT_M1U << (prec - count));
+ *lv |= signmask << (prec - count);
+ }
+}
+
+/* Shift the doubleword integer in L1, H1 left by COUNT places
+ keeping only PREC bits of result.
+ Shift right if COUNT is negative.
+ ARITH nonzero specifies arithmetic shifting; otherwise use logical shift.
+ Store the value as two `HOST_WIDE_INT' pieces in *LV and *HV. */
+
+static void
+lshift_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1,
+ unsigned HOST_WIDE_INT count, unsigned int prec,
+ unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv)
+{
+ unsigned HOST_WIDE_INT signmask;
+
+ if (count >= HOST_BITS_PER_DOUBLE_INT)
+ {
+ /* Shifting by the host word size is undefined according to the
+ ANSI standard, so we must handle this as a special case. */
+ *hv = 0;
+ *lv = 0;
+ }
+ else if (count >= HOST_BITS_PER_WIDE_INT)
+ {
+ *hv = l1 << (count - HOST_BITS_PER_WIDE_INT);
+ *lv = 0;
+ }
+ else
+ {
+ *hv = (((unsigned HOST_WIDE_INT) h1 << count)
+ | (l1 >> (HOST_BITS_PER_WIDE_INT - count - 1) >> 1));
+ *lv = l1 << count;
+ }
+
+ /* Sign extend all bits that are beyond the precision. */
+
+ signmask = -((prec > HOST_BITS_PER_WIDE_INT
+ ? ((unsigned HOST_WIDE_INT) *hv
+ >> (prec - HOST_BITS_PER_WIDE_INT - 1))
+ : (*lv >> (prec - 1))) & 1);
+
+ if (prec >= HOST_BITS_PER_DOUBLE_INT)
+ ;
+ else if (prec >= HOST_BITS_PER_WIDE_INT)
+ {
+ *hv &= ~(HOST_WIDE_INT_M1U << (prec - HOST_BITS_PER_WIDE_INT));
+ *hv |= signmask << (prec - HOST_BITS_PER_WIDE_INT);
+ }
+ else
+ {
+ *hv = signmask;
+ *lv &= ~(HOST_WIDE_INT_M1U << prec);
+ *lv |= signmask << prec;
+ }
+}
+
+/* Divide doubleword integer LNUM, HNUM by doubleword integer LDEN, HDEN
+ for a quotient (stored in *LQUO, *HQUO) and remainder (in *LREM, *HREM).
+ CODE is a tree code for a kind of division, one of
+ TRUNC_DIV_EXPR, FLOOR_DIV_EXPR, CEIL_DIV_EXPR, ROUND_DIV_EXPR
+ or EXACT_DIV_EXPR
+ It controls how the quotient is rounded to an integer.
+ Return nonzero if the operation overflows.
+ UNS nonzero says do unsigned division. */
+
+static int
+div_and_round_double (unsigned code, int uns,
+ /* num == numerator == dividend */
+ unsigned HOST_WIDE_INT lnum_orig,
+ HOST_WIDE_INT hnum_orig,
+ /* den == denominator == divisor */
+ unsigned HOST_WIDE_INT lden_orig,
+ HOST_WIDE_INT hden_orig,
+ unsigned HOST_WIDE_INT *lquo,
+ HOST_WIDE_INT *hquo, unsigned HOST_WIDE_INT *lrem,
+ HOST_WIDE_INT *hrem)
+{
+ int quo_neg = 0;
+ HOST_WIDE_INT num[4 + 1]; /* extra element for scaling. */
+ HOST_WIDE_INT den[4], quo[4];
+ int i, j;
+ unsigned HOST_WIDE_INT work;
+ unsigned HOST_WIDE_INT carry = 0;
+ unsigned HOST_WIDE_INT lnum = lnum_orig;
+ HOST_WIDE_INT hnum = hnum_orig;
+ unsigned HOST_WIDE_INT lden = lden_orig;
+ HOST_WIDE_INT hden = hden_orig;
+ int overflow = 0;
+
+ if (hden == 0 && lden == 0)
+ overflow = 1, lden = 1;
+
+ /* Calculate quotient sign and convert operands to unsigned. */
+ if (!uns)
+ {
+ if (hnum < 0)
+ {
+ quo_neg = ~ quo_neg;
+ /* (minimum integer) / (-1) is the only overflow case. */
+ if (neg_double (lnum, hnum, &lnum, &hnum)
+ && ((HOST_WIDE_INT) lden & hden) == -1)
+ overflow = 1;
+ }
+ if (hden < 0)
+ {
+ quo_neg = ~ quo_neg;
+ neg_double (lden, hden, &lden, &hden);
+ }
+ }
+
+ if (hnum == 0 && hden == 0)
+ { /* single precision */
+ *hquo = *hrem = 0;
+ /* This unsigned division rounds toward zero. */
+ *lquo = lnum / lden;
+ goto finish_up;
+ }
+
+ if (hnum == 0)
+ { /* trivial case: dividend < divisor */
+ /* hden != 0 already checked. */
+ *hquo = *lquo = 0;
+ *hrem = hnum;
+ *lrem = lnum;
+ goto finish_up;
+ }
+
+ memset (quo, 0, sizeof quo);
+
+ memset (num, 0, sizeof num); /* to zero 9th element */
+ memset (den, 0, sizeof den);
+
+ encode (num, lnum, hnum);
+ encode (den, lden, hden);
+
+ /* Special code for when the divisor < BASE. */
+ if (hden == 0 && lden < (unsigned HOST_WIDE_INT) BASE)
+ {
+ /* hnum != 0 already checked. */
+ for (i = 4 - 1; i >= 0; i--)
+ {
+ work = num[i] + carry * BASE;
+ quo[i] = work / lden;
+ carry = work % lden;
+ }
+ }
+ else
+ {
+ /* Full double precision division,
+ with thanks to Don Knuth's "Seminumerical Algorithms". */
+ int num_hi_sig, den_hi_sig;
+ unsigned HOST_WIDE_INT quo_est, scale;
+
+ /* Find the highest nonzero divisor digit. */
+ for (i = 4 - 1;; i--)
+ if (den[i] != 0)
+ {
+ den_hi_sig = i;
+ break;
+ }
+
+ /* Insure that the first digit of the divisor is at least BASE/2.
+ This is required by the quotient digit estimation algorithm. */
+
+ scale = BASE / (den[den_hi_sig] + 1);
+ if (scale > 1)
+ { /* scale divisor and dividend */
+ carry = 0;
+ for (i = 0; i <= 4 - 1; i++)
+ {
+ work = (num[i] * scale) + carry;
+ num[i] = LOWPART (work);
+ carry = HIGHPART (work);
+ }
+
+ num[4] = carry;
+ carry = 0;
+ for (i = 0; i <= 4 - 1; i++)
+ {
+ work = (den[i] * scale) + carry;
+ den[i] = LOWPART (work);
+ carry = HIGHPART (work);
+ if (den[i] != 0) den_hi_sig = i;
+ }
+ }
+
+ num_hi_sig = 4;
+
+ /* Main loop */
+ for (i = num_hi_sig - den_hi_sig - 1; i >= 0; i--)
+ {
+ /* Guess the next quotient digit, quo_est, by dividing the first
+ two remaining dividend digits by the high order quotient digit.
+ quo_est is never low and is at most 2 high. */
+ unsigned HOST_WIDE_INT tmp;
+
+ num_hi_sig = i + den_hi_sig + 1;
+ work = num[num_hi_sig] * BASE + num[num_hi_sig - 1];
+ if (num[num_hi_sig] != den[den_hi_sig])
+ quo_est = work / den[den_hi_sig];
+ else
+ quo_est = BASE - 1;
+
+ /* Refine quo_est so it's usually correct, and at most one high. */
+ tmp = work - quo_est * den[den_hi_sig];
+ if (tmp < BASE
+ && (den[den_hi_sig - 1] * quo_est
+ > (tmp * BASE + num[num_hi_sig - 2])))
+ quo_est--;
+
+ /* Try QUO_EST as the quotient digit, by multiplying the
+ divisor by QUO_EST and subtracting from the remaining dividend.
+ Keep in mind that QUO_EST is the I - 1st digit. */
+
+ carry = 0;
+ for (j = 0; j <= den_hi_sig; j++)
+ {
+ work = quo_est * den[j] + carry;
+ carry = HIGHPART (work);
+ work = num[i + j] - LOWPART (work);
+ num[i + j] = LOWPART (work);
+ carry += HIGHPART (work) != 0;
+ }
+
+ /* If quo_est was high by one, then num[i] went negative and
+ we need to correct things. */
+ if (num[num_hi_sig] < (HOST_WIDE_INT) carry)
+ {
+ quo_est--;
+ carry = 0; /* add divisor back in */
+ for (j = 0; j <= den_hi_sig; j++)
+ {
+ work = num[i + j] + den[j] + carry;
+ carry = HIGHPART (work);
+ num[i + j] = LOWPART (work);
+ }
+
+ num [num_hi_sig] += carry;
+ }
+
+ /* Store the quotient digit. */
+ quo[i] = quo_est;
+ }
+ }
+
+ decode (quo, lquo, hquo);
+
+ finish_up:
+ /* If result is negative, make it so. */
+ if (quo_neg)
+ neg_double (*lquo, *hquo, lquo, hquo);
+
+ /* Compute trial remainder: rem = num - (quo * den) */
+ mul_double (*lquo, *hquo, lden_orig, hden_orig, lrem, hrem);
+ neg_double (*lrem, *hrem, lrem, hrem);
+ add_double (lnum_orig, hnum_orig, *lrem, *hrem, lrem, hrem);
+
+ switch (code)
+ {
+ case TRUNC_DIV_EXPR:
+ case TRUNC_MOD_EXPR: /* round toward zero */
+ case EXACT_DIV_EXPR: /* for this one, it shouldn't matter */
+ return overflow;
+
+ case FLOOR_DIV_EXPR:
+ case FLOOR_MOD_EXPR: /* round toward negative infinity */
+ if (quo_neg && (*lrem != 0 || *hrem != 0)) /* ratio < 0 && rem != 0 */
+ {
+ /* quo = quo - 1; */
+ add_double (*lquo, *hquo, (HOST_WIDE_INT) -1, (HOST_WIDE_INT) -1,
+ lquo, hquo);
+ }
+ else
+ return overflow;
+ break;
+
+ case CEIL_DIV_EXPR:
+ case CEIL_MOD_EXPR: /* round toward positive infinity */
+ if (!quo_neg && (*lrem != 0 || *hrem != 0)) /* ratio > 0 && rem != 0 */
+ {
+ add_double (*lquo, *hquo, (HOST_WIDE_INT) 1, (HOST_WIDE_INT) 0,
+ lquo, hquo);
+ }
+ else
+ return overflow;
+ break;
+
+ case ROUND_DIV_EXPR:
+ case ROUND_MOD_EXPR: /* round to closest integer */
+ {
+ unsigned HOST_WIDE_INT labs_rem = *lrem;
+ HOST_WIDE_INT habs_rem = *hrem;
+ unsigned HOST_WIDE_INT labs_den = lden, lnegabs_rem, ldiff;
+ HOST_WIDE_INT habs_den = hden, hnegabs_rem, hdiff;
+
+ /* Get absolute values. */
+ if (!uns && *hrem < 0)
+ neg_double (*lrem, *hrem, &labs_rem, &habs_rem);
+ if (!uns && hden < 0)
+ neg_double (lden, hden, &labs_den, &habs_den);
+
+ /* If abs(rem) >= abs(den) - abs(rem), adjust the quotient. */
+ neg_double (labs_rem, habs_rem, &lnegabs_rem, &hnegabs_rem);
+ add_double (labs_den, habs_den, lnegabs_rem, hnegabs_rem,
+ &ldiff, &hdiff);
+
+ if (((unsigned HOST_WIDE_INT) habs_rem
+ > (unsigned HOST_WIDE_INT) hdiff)
+ || (habs_rem == hdiff && labs_rem >= ldiff))
+ {
+ if (quo_neg)
+ /* quo = quo - 1; */
+ add_double (*lquo, *hquo,
+ (HOST_WIDE_INT) -1, (HOST_WIDE_INT) -1, lquo, hquo);
+ else
+ /* quo = quo + 1; */
+ add_double (*lquo, *hquo, (HOST_WIDE_INT) 1, (HOST_WIDE_INT) 0,
+ lquo, hquo);
+ }
+ else
+ return overflow;
+ }
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+
+ /* Compute true remainder: rem = num - (quo * den) */
+ mul_double (*lquo, *hquo, lden_orig, hden_orig, lrem, hrem);
+ neg_double (*lrem, *hrem, lrem, hrem);
+ add_double (lnum_orig, hnum_orig, *lrem, *hrem, lrem, hrem);
+ return overflow;
+}
+
+
+/* Construct from a buffer of length LEN. BUFFER will be read according
+ to byte endianess and word endianess. Only the lower LEN bytes
+ of the result are set; the remaining high bytes are cleared. */
+
+double_int
+double_int::from_buffer (const unsigned char *buffer, int len)
+{
+ double_int result = double_int_zero;
+ int words = len / UNITS_PER_WORD;
+
+ gcc_assert (len * BITS_PER_UNIT <= HOST_BITS_PER_DOUBLE_INT);
+
+ for (int byte = 0; byte < len; byte++)
+ {
+ int offset;
+ int bitpos = byte * BITS_PER_UNIT;
+ unsigned HOST_WIDE_INT value;
+
+ if (len > UNITS_PER_WORD)
+ {
+ int word = byte / UNITS_PER_WORD;
+
+ if (WORDS_BIG_ENDIAN)
+ word = (words - 1) - word;
+
+ offset = word * UNITS_PER_WORD;
+
+ if (BYTES_BIG_ENDIAN)
+ offset += (UNITS_PER_WORD - 1) - (byte % UNITS_PER_WORD);
+ else
+ offset += byte % UNITS_PER_WORD;
+ }
+ else
+ offset = BYTES_BIG_ENDIAN ? (len - 1) - byte : byte;
+
+ value = (unsigned HOST_WIDE_INT) buffer[offset];
+
+ if (bitpos < HOST_BITS_PER_WIDE_INT)
+ result.low |= value << bitpos;
+ else
+ result.high |= value << (bitpos - HOST_BITS_PER_WIDE_INT);
+ }
+
+ return result;
+}
+
+
/* Returns mask for PREC bits. */
-static inline double_int
-double_int_mask (unsigned prec)
+double_int
+double_int::mask (unsigned prec)
{
unsigned HOST_WIDE_INT m;
double_int mask;
else
{
mask.high = 0;
- mask.low = ((unsigned HOST_WIDE_INT) 2 << (prec - 1)) - 1;
+ mask.low = prec ? ((unsigned HOST_WIDE_INT) 2 << (prec - 1)) - 1 : 0;
}
return mask;
}
+/* Returns a maximum value for signed or unsigned integer
+ of precision PREC. */
+
+double_int
+double_int::max_value (unsigned int prec, bool uns)
+{
+ return double_int::mask (prec - (uns ? 0 : 1));
+}
+
+/* Returns a minimum value for signed or unsigned integer
+ of precision PREC. */
+
+double_int
+double_int::min_value (unsigned int prec, bool uns)
+{
+ if (uns)
+ return double_int_zero;
+ return double_int_one.lshift (prec - 1, prec, false);
+}
+
/* Clears the bits of CST over the precision PREC. If UNS is false, the bits
outside of the precision are set to the sign bit (i.e., the PREC-th one),
otherwise they are set to zero.
-
+
This corresponds to returning the value represented by PREC lowermost bits
of CST, with the given signedness. */
double_int
-double_int_ext (double_int cst, unsigned prec, bool uns)
+double_int::ext (unsigned prec, bool uns) const
{
if (uns)
- return double_int_zext (cst, prec);
+ return this->zext (prec);
else
- return double_int_sext (cst, prec);
+ return this->sext (prec);
}
-/* The same as double_int_ext with UNS = true. */
+/* The same as double_int::ext with UNS = true. */
double_int
-double_int_zext (double_int cst, unsigned prec)
+double_int::zext (unsigned prec) const
{
- double_int mask = double_int_mask (prec);
+ const double_int &cst = *this;
+ double_int mask = double_int::mask (prec);
double_int r;
- r.low = cst.low & ~mask.low;
- r.high = cst.high & ~mask.high;
+ r.low = cst.low & mask.low;
+ r.high = cst.high & mask.high;
return r;
}
-/* The same as double_int_ext with UNS = false. */
+/* The same as double_int::ext with UNS = false. */
double_int
-double_int_sext (double_int cst, unsigned prec)
+double_int::sext (unsigned prec) const
{
- double_int mask = double_int_mask (prec);
+ const double_int &cst = *this;
+ double_int mask = double_int::mask (prec);
double_int r;
unsigned HOST_WIDE_INT snum;
}
if (((snum >> (prec - 1)) & 1) == 1)
{
- r.low = cst.low | mask.low;
- r.high = cst.high | mask.high;
+ r.low = cst.low | ~mask.low;
+ r.high = cst.high | ~mask.high;
}
else
{
- r.low = cst.low & ~mask.low;
- r.high = cst.high & ~mask.high;
- }
+ r.low = cst.low & mask.low;
+ r.high = cst.high & mask.high;
+ }
return r;
}
-/* Constructs long integer from tree CST. The extra bits over the precision of
- the number are filled with sign bit if CST is signed, and with zeros if it
- is unsigned. */
-
-double_int
-tree_to_double_int (tree cst)
-{
- /* We do not need to call double_int_restrict here to ensure the semantics as
- described, as this is the default one for trees. */
- return TREE_INT_CST (cst);
-}
-
-/* Returns true if CST fits in unsigned HOST_WIDE_INT. */
-
-bool
-double_int_fits_in_uhwi_p (double_int cst)
-{
- return cst.high == 0;
-}
-
/* Returns true if CST fits in signed HOST_WIDE_INT. */
bool
-double_int_fits_in_shwi_p (double_int cst)
+double_int::fits_shwi () const
{
+ const double_int &cst = *this;
if (cst.high == 0)
return (HOST_WIDE_INT) cst.low >= 0;
else if (cst.high == -1)
unsigned HOST_WIDE_INT if UNS is true. */
bool
-double_int_fits_in_hwi_p (double_int cst, bool uns)
+double_int::fits_hwi (bool uns) const
{
if (uns)
- return double_int_fits_in_uhwi_p (cst);
+ return this->fits_uhwi ();
else
- return double_int_fits_in_shwi_p (cst);
+ return this->fits_shwi ();
}
-/* Returns value of CST as a signed number. CST must satisfy
- double_int_fits_in_shwi_p. */
+/* Returns A * B. */
-HOST_WIDE_INT
-double_int_to_shwi (double_int cst)
+double_int
+double_int::operator * (double_int b) const
{
- return (HOST_WIDE_INT) cst.low;
+ const double_int &a = *this;
+ double_int ret;
+ mul_double (a.low, a.high, b.low, b.high, &ret.low, &ret.high);
+ return ret;
}
-/* Returns value of CST as an unsigned number. CST must satisfy
- double_int_fits_in_uhwi_p. */
+/* Multiplies *this with B and returns a reference to *this. */
-unsigned HOST_WIDE_INT
-double_int_to_uhwi (double_int cst)
+double_int &
+double_int::operator *= (double_int b)
{
- return cst.low;
+ mul_double (low, high, b.low, b.high, &low, &high);
+ return *this;
}
-/* Returns A * B. */
+/* Returns A * B. If the operation overflows according to UNSIGNED_P,
+ *OVERFLOW is set to nonzero. */
double_int
-double_int_mul (double_int a, double_int b)
+double_int::mul_with_sign (double_int b, bool unsigned_p, bool *overflow) const
{
- double_int ret;
- mul_double (a.low, a.high, b.low, b.high, &ret.low, &ret.high);
+ const double_int &a = *this;
+ double_int ret, tem;
+ *overflow = mul_double_wide_with_sign (a.low, a.high, b.low, b.high,
+ &ret.low, &ret.high,
+ &tem.low, &tem.high, unsigned_p);
return ret;
}
+double_int
+double_int::wide_mul_with_sign (double_int b, bool unsigned_p,
+ double_int *higher, bool *overflow) const
+
+{
+ double_int lower;
+ *overflow = mul_double_wide_with_sign (low, high, b.low, b.high,
+ &lower.low, &lower.high,
+ &higher->low, &higher->high,
+ unsigned_p);
+ return lower;
+}
+
/* Returns A + B. */
double_int
-double_int_add (double_int a, double_int b)
+double_int::operator + (double_int b) const
{
+ const double_int &a = *this;
double_int ret;
add_double (a.low, a.high, b.low, b.high, &ret.low, &ret.high);
return ret;
}
+/* Adds B to *this and returns a reference to *this. */
+
+double_int &
+double_int::operator += (double_int b)
+{
+ add_double (low, high, b.low, b.high, &low, &high);
+ return *this;
+}
+
+
+/* Returns A + B. If the operation overflows according to UNSIGNED_P,
+ *OVERFLOW is set to nonzero. */
+
+double_int
+double_int::add_with_sign (double_int b, bool unsigned_p, bool *overflow) const
+{
+ const double_int &a = *this;
+ double_int ret;
+ *overflow = add_double_with_sign (a.low, a.high, b.low, b.high,
+ &ret.low, &ret.high, unsigned_p);
+ return ret;
+}
+
+/* Returns A - B. */
+
+double_int
+double_int::operator - (double_int b) const
+{
+ const double_int &a = *this;
+ double_int ret;
+ neg_double (b.low, b.high, &b.low, &b.high);
+ add_double (a.low, a.high, b.low, b.high, &ret.low, &ret.high);
+ return ret;
+}
+
+/* Subtracts B from *this and returns a reference to *this. */
+
+double_int &
+double_int::operator -= (double_int b)
+{
+ neg_double (b.low, b.high, &b.low, &b.high);
+ add_double (low, high, b.low, b.high, &low, &high);
+ return *this;
+}
+
+
+/* Returns A - B. If the operation overflows via inconsistent sign bits,
+ *OVERFLOW is set to nonzero. */
+
+double_int
+double_int::sub_with_overflow (double_int b, bool *overflow) const
+{
+ double_int ret;
+ neg_double (b.low, b.high, &ret.low, &ret.high);
+ add_double (low, high, ret.low, ret.high, &ret.low, &ret.high);
+ *overflow = OVERFLOW_SUM_SIGN (ret.high, b.high, high);
+ return ret;
+}
+
/* Returns -A. */
double_int
-double_int_neg (double_int a)
+double_int::operator - () const
{
+ const double_int &a = *this;
double_int ret;
neg_double (a.low, a.high, &ret.low, &ret.high);
return ret;
}
+double_int
+double_int::neg_with_overflow (bool *overflow) const
+{
+ double_int ret;
+ *overflow = neg_double (low, high, &ret.low, &ret.high);
+ return ret;
+}
+
/* Returns A / B (computed as unsigned depending on UNS, and rounded as
specified by CODE). CODE is enum tree_code in fact, but double_int.h
- must be included before tree.h. */
+ must be included before tree.h. The remainder after the division is
+ stored to MOD. */
double_int
-double_int_div (double_int a, double_int b, bool uns, unsigned code)
+double_int::divmod_with_overflow (double_int b, bool uns, unsigned code,
+ double_int *mod, bool *overflow) const
{
- unsigned HOST_WIDE_INT rem_lo;
- HOST_WIDE_INT rem_hi;
+ const double_int &a = *this;
double_int ret;
- div_and_round_double (code, uns, a.low, a.high, b.low, b.high,
- &ret.low, &ret.high, &rem_lo, &rem_hi);
+ *overflow = div_and_round_double (code, uns, a.low, a.high,
+ b.low, b.high, &ret.low, &ret.high,
+ &mod->low, &mod->high);
return ret;
}
-/* The same as double_int_div with UNS = false. */
+double_int
+double_int::divmod (double_int b, bool uns, unsigned code,
+ double_int *mod) const
+{
+ const double_int &a = *this;
+ double_int ret;
+
+ div_and_round_double (code, uns, a.low, a.high,
+ b.low, b.high, &ret.low, &ret.high,
+ &mod->low, &mod->high);
+ return ret;
+}
+
+/* The same as double_int::divmod with UNS = false. */
+
+double_int
+double_int::sdivmod (double_int b, unsigned code, double_int *mod) const
+{
+ return this->divmod (b, false, code, mod);
+}
+
+/* The same as double_int::divmod with UNS = true. */
double_int
-double_int_sdiv (double_int a, double_int b, unsigned code)
+double_int::udivmod (double_int b, unsigned code, double_int *mod) const
{
- return double_int_div (a, b, false, code);
+ return this->divmod (b, true, code, mod);
}
-/* The same as double_int_div with UNS = true. */
+/* Returns A / B (computed as unsigned depending on UNS, and rounded as
+ specified by CODE). CODE is enum tree_code in fact, but double_int.h
+ must be included before tree.h. */
double_int
-double_int_udiv (double_int a, double_int b, unsigned code)
+double_int::div (double_int b, bool uns, unsigned code) const
{
- return double_int_div (a, b, true, code);
+ double_int mod;
+
+ return this->divmod (b, uns, code, &mod);
}
-/* Constructs tree in type TYPE from with value given by CST. */
+/* The same as double_int::div with UNS = false. */
+
+double_int
+double_int::sdiv (double_int b, unsigned code) const
+{
+ return this->div (b, false, code);
+}
-tree
-double_int_to_tree (tree type, double_int cst)
+/* The same as double_int::div with UNS = true. */
+
+double_int
+double_int::udiv (double_int b, unsigned code) const
+{
+ return this->div (b, true, code);
+}
+
+/* Returns A % B (computed as unsigned depending on UNS, and rounded as
+ specified by CODE). CODE is enum tree_code in fact, but double_int.h
+ must be included before tree.h. */
+
+double_int
+double_int::mod (double_int b, bool uns, unsigned code) const
+{
+ double_int mod;
+
+ this->divmod (b, uns, code, &mod);
+ return mod;
+}
+
+/* The same as double_int::mod with UNS = false. */
+
+double_int
+double_int::smod (double_int b, unsigned code) const
{
- cst = double_int_ext (cst, TYPE_PRECISION (type), TYPE_UNSIGNED (type));
+ return this->mod (b, false, code);
+}
+
+/* The same as double_int::mod with UNS = true. */
- return build_int_cst_wide (type, cst.low, cst.high);
+double_int
+double_int::umod (double_int b, unsigned code) const
+{
+ return this->mod (b, true, code);
}
-/* Returns true if CST is negative. Of course, CST is considered to
- be signed. */
+/* Return TRUE iff PRODUCT is an integral multiple of FACTOR, and return
+ the multiple in *MULTIPLE. Otherwise return FALSE and leave *MULTIPLE
+ unchanged. */
bool
-double_int_negative_p (double_int cst)
+double_int::multiple_of (double_int factor,
+ bool unsigned_p, double_int *multiple) const
+{
+ double_int remainder;
+ double_int quotient = this->divmod (factor, unsigned_p,
+ TRUNC_DIV_EXPR, &remainder);
+ if (remainder.is_zero ())
+ {
+ *multiple = quotient;
+ return true;
+ }
+
+ return false;
+}
+
+/* Set BITPOS bit in A. */
+double_int
+double_int::set_bit (unsigned bitpos) const
{
- return cst.high < 0;
+ double_int a = *this;
+ if (bitpos < HOST_BITS_PER_WIDE_INT)
+ a.low |= (unsigned HOST_WIDE_INT) 1 << bitpos;
+ else
+ a.high |= (HOST_WIDE_INT) 1 << (bitpos - HOST_BITS_PER_WIDE_INT);
+
+ return a;
+}
+
+/* Count trailing zeros in A. */
+int
+double_int::trailing_zeros () const
+{
+ const double_int &a = *this;
+ unsigned HOST_WIDE_INT w = a.low ? a.low : (unsigned HOST_WIDE_INT) a.high;
+ unsigned bits = a.low ? 0 : HOST_BITS_PER_WIDE_INT;
+ if (!w)
+ return HOST_BITS_PER_DOUBLE_INT;
+ bits += ctz_hwi (w);
+ return bits;
+}
+
+/* Shift A left by COUNT places. */
+
+double_int
+double_int::lshift (HOST_WIDE_INT count) const
+{
+ double_int ret;
+
+ gcc_checking_assert (count >= 0);
+
+ if (count >= HOST_BITS_PER_DOUBLE_INT)
+ {
+ /* Shifting by the host word size is undefined according to the
+ ANSI standard, so we must handle this as a special case. */
+ ret.high = 0;
+ ret.low = 0;
+ }
+ else if (count >= HOST_BITS_PER_WIDE_INT)
+ {
+ ret.high = low << (count - HOST_BITS_PER_WIDE_INT);
+ ret.low = 0;
+ }
+ else
+ {
+ ret.high = (((unsigned HOST_WIDE_INT) high << count)
+ | (low >> (HOST_BITS_PER_WIDE_INT - count - 1) >> 1));
+ ret.low = low << count;
+ }
+
+ return ret;
+}
+
+/* Shift A right by COUNT places. */
+
+double_int
+double_int::rshift (HOST_WIDE_INT count) const
+{
+ double_int ret;
+
+ gcc_checking_assert (count >= 0);
+
+ if (count >= HOST_BITS_PER_DOUBLE_INT)
+ {
+ /* Shifting by the host word size is undefined according to the
+ ANSI standard, so we must handle this as a special case. */
+ ret.high = 0;
+ ret.low = 0;
+ }
+ else if (count >= HOST_BITS_PER_WIDE_INT)
+ {
+ ret.high = 0;
+ ret.low
+ = (unsigned HOST_WIDE_INT) (high >> (count - HOST_BITS_PER_WIDE_INT));
+ }
+ else
+ {
+ ret.high = high >> count;
+ ret.low = ((low >> count)
+ | ((unsigned HOST_WIDE_INT) high
+ << (HOST_BITS_PER_WIDE_INT - count - 1) << 1));
+ }
+
+ return ret;
+}
+
+/* Shift A left by COUNT places keeping only PREC bits of result. Shift
+ right if COUNT is negative. ARITH true specifies arithmetic shifting;
+ otherwise use logical shift. */
+
+double_int
+double_int::lshift (HOST_WIDE_INT count, unsigned int prec, bool arith) const
+{
+ double_int ret;
+ if (count > 0)
+ lshift_double (low, high, count, prec, &ret.low, &ret.high);
+ else
+ rshift_double (low, high, absu_hwi (count), prec, &ret.low, &ret.high, arith);
+ return ret;
+}
+
+/* Shift A right by COUNT places keeping only PREC bits of result. Shift
+ left if COUNT is negative. ARITH true specifies arithmetic shifting;
+ otherwise use logical shift. */
+
+double_int
+double_int::rshift (HOST_WIDE_INT count, unsigned int prec, bool arith) const
+{
+ double_int ret;
+ if (count > 0)
+ rshift_double (low, high, count, prec, &ret.low, &ret.high, arith);
+ else
+ lshift_double (low, high, absu_hwi (count), prec, &ret.low, &ret.high);
+ return ret;
+}
+
+/* Arithmetic shift A left by COUNT places keeping only PREC bits of result.
+ Shift right if COUNT is negative. */
+
+double_int
+double_int::alshift (HOST_WIDE_INT count, unsigned int prec) const
+{
+ double_int r;
+ if (count > 0)
+ lshift_double (low, high, count, prec, &r.low, &r.high);
+ else
+ rshift_double (low, high, absu_hwi (count), prec, &r.low, &r.high, true);
+ return r;
+}
+
+/* Arithmetic shift A right by COUNT places keeping only PREC bits of result.
+ Shift left if COUNT is negative. */
+
+double_int
+double_int::arshift (HOST_WIDE_INT count, unsigned int prec) const
+{
+ double_int r;
+ if (count > 0)
+ rshift_double (low, high, count, prec, &r.low, &r.high, true);
+ else
+ lshift_double (low, high, absu_hwi (count), prec, &r.low, &r.high);
+ return r;
+}
+
+/* Logical shift A left by COUNT places keeping only PREC bits of result.
+ Shift right if COUNT is negative. */
+
+double_int
+double_int::llshift (HOST_WIDE_INT count, unsigned int prec) const
+{
+ double_int r;
+ if (count > 0)
+ lshift_double (low, high, count, prec, &r.low, &r.high);
+ else
+ rshift_double (low, high, absu_hwi (count), prec, &r.low, &r.high, false);
+ return r;
+}
+
+/* Logical shift A right by COUNT places keeping only PREC bits of result.
+ Shift left if COUNT is negative. */
+
+double_int
+double_int::lrshift (HOST_WIDE_INT count, unsigned int prec) const
+{
+ double_int r;
+ if (count > 0)
+ rshift_double (low, high, count, prec, &r.low, &r.high, false);
+ else
+ lshift_double (low, high, absu_hwi (count), prec, &r.low, &r.high);
+ return r;
+}
+
+/* Rotate A left by COUNT places keeping only PREC bits of result.
+ Rotate right if COUNT is negative. */
+
+double_int
+double_int::lrotate (HOST_WIDE_INT count, unsigned int prec) const
+{
+ double_int t1, t2;
+
+ count %= prec;
+ if (count < 0)
+ count += prec;
+
+ t1 = this->llshift (count, prec);
+ t2 = this->lrshift (prec - count, prec);
+
+ return t1 | t2;
+}
+
+/* Rotate A rigth by COUNT places keeping only PREC bits of result.
+ Rotate right if COUNT is negative. */
+
+double_int
+double_int::rrotate (HOST_WIDE_INT count, unsigned int prec) const
+{
+ double_int t1, t2;
+
+ count %= prec;
+ if (count < 0)
+ count += prec;
+
+ t1 = this->lrshift (count, prec);
+ t2 = this->llshift (prec - count, prec);
+
+ return t1 | t2;
}
/* Returns -1 if A < B, 0 if A == B and 1 if A > B. Signedness of the
comparison is given by UNS. */
int
-double_int_cmp (double_int a, double_int b, bool uns)
+double_int::cmp (double_int b, bool uns) const
{
if (uns)
- return double_int_ucmp (a, b);
+ return this->ucmp (b);
else
- return double_int_scmp (a, b);
+ return this->scmp (b);
}
/* Compares two unsigned values A and B. Returns -1 if A < B, 0 if A == B,
and 1 if A > B. */
int
-double_int_ucmp (double_int a, double_int b)
+double_int::ucmp (double_int b) const
{
+ const double_int &a = *this;
if ((unsigned HOST_WIDE_INT) a.high < (unsigned HOST_WIDE_INT) b.high)
return -1;
if ((unsigned HOST_WIDE_INT) a.high > (unsigned HOST_WIDE_INT) b.high)
and 1 if A > B. */
int
-double_int_scmp (double_int a, double_int b)
+double_int::scmp (double_int b) const
{
+ const double_int &a = *this;
if (a.high < b.high)
return -1;
if (a.high > b.high)
return 1;
- if ((HOST_WIDE_INT) a.low < (HOST_WIDE_INT) b.low)
+ if (a.low < b.low)
return -1;
- if ((HOST_WIDE_INT) a.low > (HOST_WIDE_INT) b.low)
+ if (a.low > b.low)
return 1;
return 0;
}
+/* Compares two unsigned values A and B for less-than. */
+
+bool
+double_int::ult (double_int b) const
+{
+ if ((unsigned HOST_WIDE_INT) high < (unsigned HOST_WIDE_INT) b.high)
+ return true;
+ if ((unsigned HOST_WIDE_INT) high > (unsigned HOST_WIDE_INT) b.high)
+ return false;
+ if (low < b.low)
+ return true;
+ return false;
+}
+
+/* Compares two unsigned values A and B for less-than or equal-to. */
+
+bool
+double_int::ule (double_int b) const
+{
+ if ((unsigned HOST_WIDE_INT) high < (unsigned HOST_WIDE_INT) b.high)
+ return true;
+ if ((unsigned HOST_WIDE_INT) high > (unsigned HOST_WIDE_INT) b.high)
+ return false;
+ if (low <= b.low)
+ return true;
+ return false;
+}
+
+/* Compares two unsigned values A and B for greater-than. */
+
+bool
+double_int::ugt (double_int b) const
+{
+ if ((unsigned HOST_WIDE_INT) high > (unsigned HOST_WIDE_INT) b.high)
+ return true;
+ if ((unsigned HOST_WIDE_INT) high < (unsigned HOST_WIDE_INT) b.high)
+ return false;
+ if (low > b.low)
+ return true;
+ return false;
+}
+
+/* Compares two signed values A and B for less-than. */
+
+bool
+double_int::slt (double_int b) const
+{
+ if (high < b.high)
+ return true;
+ if (high > b.high)
+ return false;
+ if (low < b.low)
+ return true;
+ return false;
+}
+
+/* Compares two signed values A and B for less-than or equal-to. */
+
+bool
+double_int::sle (double_int b) const
+{
+ if (high < b.high)
+ return true;
+ if (high > b.high)
+ return false;
+ if (low <= b.low)
+ return true;
+ return false;
+}
+
+/* Compares two signed values A and B for greater-than. */
+
+bool
+double_int::sgt (double_int b) const
+{
+ if (high > b.high)
+ return true;
+ if (high < b.high)
+ return false;
+ if (low > b.low)
+ return true;
+ return false;
+}
+
+
+/* Compares two values A and B. Returns max value. Signedness of the
+ comparison is given by UNS. */
+
+double_int
+double_int::max (double_int b, bool uns)
+{
+ return (this->cmp (b, uns) == 1) ? *this : b;
+}
+
+/* Compares two signed values A and B. Returns max value. */
+
+double_int
+double_int::smax (double_int b)
+{
+ return (this->scmp (b) == 1) ? *this : b;
+}
+
+/* Compares two unsigned values A and B. Returns max value. */
+
+double_int
+double_int::umax (double_int b)
+{
+ return (this->ucmp (b) == 1) ? *this : b;
+}
+
+/* Compares two values A and B. Returns mix value. Signedness of the
+ comparison is given by UNS. */
+
+double_int
+double_int::min (double_int b, bool uns)
+{
+ return (this->cmp (b, uns) == -1) ? *this : b;
+}
+
+/* Compares two signed values A and B. Returns min value. */
+
+double_int
+double_int::smin (double_int b)
+{
+ return (this->scmp (b) == -1) ? *this : b;
+}
+
+/* Compares two unsigned values A and B. Returns min value. */
+
+double_int
+double_int::umin (double_int b)
+{
+ return (this->ucmp (b) == -1) ? *this : b;
+}
+
/* Splits last digit of *CST (taken as unsigned) in BASE and returns it. */
static unsigned
unsigned digits[100], n;
int i;
- if (double_int_zero_p (cst))
+ if (cst.is_zero ())
{
fprintf (file, "0");
return;
}
- if (!uns && double_int_negative_p (cst))
+ if (!uns && cst.is_negative ())
{
fprintf (file, "-");
- cst = double_int_neg (cst);
+ cst = -cst;
}
- for (n = 0; !double_int_zero_p (cst); n++)
+ for (n = 0; !cst.is_zero (); n++)
digits[n] = double_int_split_digit (&cst, 10);
for (i = n - 1; i >= 0; i--)
fprintf (file, "%u", digits[i]);
}
+
+
+/* Sets RESULT to VAL, taken unsigned if UNS is true and as signed
+ otherwise. */
+
+void
+mpz_set_double_int (mpz_t result, double_int val, bool uns)
+{
+ bool negate = false;
+ unsigned HOST_WIDE_INT vp[2];
+
+ if (!uns && val.is_negative ())
+ {
+ negate = true;
+ val = -val;
+ }
+
+ vp[0] = val.low;
+ vp[1] = (unsigned HOST_WIDE_INT) val.high;
+ mpz_import (result, 2, -1, sizeof (HOST_WIDE_INT), 0, 0, vp);
+
+ if (negate)
+ mpz_neg (result, result);
+}
+
+/* Returns VAL converted to TYPE. If WRAP is true, then out-of-range
+ values of VAL will be wrapped; otherwise, they will be set to the
+ appropriate minimum or maximum TYPE bound. */
+
+double_int
+mpz_get_double_int (const_tree type, mpz_t val, bool wrap)
+{
+ unsigned HOST_WIDE_INT *vp;
+ size_t count, numb;
+ double_int res;
+
+ if (!wrap)
+ {
+ mpz_t min, max;
+
+ mpz_init (min);
+ mpz_init (max);
+ get_type_static_bounds (type, min, max);
+
+ if (mpz_cmp (val, min) < 0)
+ mpz_set (val, min);
+ else if (mpz_cmp (val, max) > 0)
+ mpz_set (val, max);
+
+ mpz_clear (min);
+ mpz_clear (max);
+ }
+
+ /* Determine the number of unsigned HOST_WIDE_INT that are required
+ for representing the value. The code to calculate count is
+ extracted from the GMP manual, section "Integer Import and Export":
+ http://gmplib.org/manual/Integer-Import-and-Export.html */
+ numb = 8 * sizeof (HOST_WIDE_INT);
+ count = (mpz_sizeinbase (val, 2) + numb-1) / numb;
+ if (count < 2)
+ count = 2;
+ vp = (unsigned HOST_WIDE_INT *) alloca (count * sizeof (HOST_WIDE_INT));
+
+ vp[0] = 0;
+ vp[1] = 0;
+ mpz_export (vp, &count, -1, sizeof (HOST_WIDE_INT), 0, 0, val);
+
+ gcc_assert (wrap || count <= 2);
+
+ res.low = vp[0];
+ res.high = (HOST_WIDE_INT) vp[1];
+
+ res = res.ext (TYPE_PRECISION (type), TYPE_UNSIGNED (type));
+ if (mpz_sgn (val) < 0)
+ res = -res;
+
+ return res;
+}
projects / gcc.git / blobdiff