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Diffstat (limited to 'gcc/fixed-value.c')
| -rw-r--r-- | gcc/fixed-value.c | 1120 |
1 files changed, 0 insertions, 1120 deletions
diff --git a/gcc/fixed-value.c b/gcc/fixed-value.c deleted file mode 100644 index 655edd3..0000000 --- a/gcc/fixed-value.c +++ /dev/null @@ -1,1120 +0,0 @@ -/* Fixed-point arithmetic support. - Copyright (C) 2006-2022 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/>. */ - -#include "config.h" -#include "system.h" -#include "coretypes.h" -#include "tm.h" -#include "tree.h" -#include "diagnostic-core.h" - -/* Compare two fixed objects for bitwise identity. */ - -bool -fixed_identical (const FIXED_VALUE_TYPE *a, const FIXED_VALUE_TYPE *b) -{ - return (a->mode == b->mode - && a->data.high == b->data.high - && a->data.low == b->data.low); -} - -/* Calculate a hash value. */ - -unsigned int -fixed_hash (const FIXED_VALUE_TYPE *f) -{ - return (unsigned int) (f->data.low ^ f->data.high); -} - -/* Define the enum code for the range of the fixed-point value. */ -enum fixed_value_range_code { - FIXED_OK, /* The value is within the range. */ - FIXED_UNDERFLOW, /* The value is less than the minimum. */ - FIXED_GT_MAX_EPS, /* The value is greater than the maximum, but not equal - to the maximum plus the epsilon. */ - FIXED_MAX_EPS /* The value equals the maximum plus the epsilon. */ -}; - -/* Check REAL_VALUE against the range of the fixed-point mode. - Return FIXED_OK, if it is within the range. - FIXED_UNDERFLOW, if it is less than the minimum. - FIXED_GT_MAX_EPS, if it is greater than the maximum, but not equal to - the maximum plus the epsilon. - FIXED_MAX_EPS, if it is equal to the maximum plus the epsilon. */ - -static enum fixed_value_range_code -check_real_for_fixed_mode (REAL_VALUE_TYPE *real_value, machine_mode mode) -{ - REAL_VALUE_TYPE max_value, min_value, epsilon_value; - - real_2expN (&max_value, GET_MODE_IBIT (mode), VOIDmode); - real_2expN (&epsilon_value, -GET_MODE_FBIT (mode), VOIDmode); - - if (SIGNED_FIXED_POINT_MODE_P (mode)) - min_value = real_value_negate (&max_value); - else - real_from_string (&min_value, "0.0"); - - if (real_compare (LT_EXPR, real_value, &min_value)) - return FIXED_UNDERFLOW; - if (real_compare (EQ_EXPR, real_value, &max_value)) - return FIXED_MAX_EPS; - real_arithmetic (&max_value, MINUS_EXPR, &max_value, &epsilon_value); - if (real_compare (GT_EXPR, real_value, &max_value)) - return FIXED_GT_MAX_EPS; - return FIXED_OK; -} - - -/* Construct a CONST_FIXED from a bit payload and machine mode MODE. - The bits in PAYLOAD are sign-extended/zero-extended according to MODE. */ - -FIXED_VALUE_TYPE -fixed_from_double_int (double_int payload, scalar_mode mode) -{ - FIXED_VALUE_TYPE value; - - gcc_assert (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_DOUBLE_INT); - - if (SIGNED_SCALAR_FIXED_POINT_MODE_P (mode)) - value.data = payload.sext (1 + GET_MODE_IBIT (mode) + GET_MODE_FBIT (mode)); - else if (UNSIGNED_SCALAR_FIXED_POINT_MODE_P (mode)) - value.data = payload.zext (GET_MODE_IBIT (mode) + GET_MODE_FBIT (mode)); - else - gcc_unreachable (); - - value.mode = mode; - - return value; -} - - -/* Initialize from a decimal or hexadecimal string. */ - -void -fixed_from_string (FIXED_VALUE_TYPE *f, const char *str, scalar_mode mode) -{ - REAL_VALUE_TYPE real_value, fixed_value, base_value; - unsigned int fbit; - enum fixed_value_range_code temp; - bool fail; - - f->mode = mode; - fbit = GET_MODE_FBIT (mode); - - real_from_string (&real_value, str); - temp = check_real_for_fixed_mode (&real_value, f->mode); - /* We don't want to warn the case when the _Fract value is 1.0. */ - if (temp == FIXED_UNDERFLOW - || temp == FIXED_GT_MAX_EPS - || (temp == FIXED_MAX_EPS && ALL_ACCUM_MODE_P (f->mode))) - warning (OPT_Woverflow, - "large fixed-point constant implicitly truncated to fixed-point type"); - real_2expN (&base_value, fbit, VOIDmode); - real_arithmetic (&fixed_value, MULT_EXPR, &real_value, &base_value); - wide_int w = real_to_integer (&fixed_value, &fail, - GET_MODE_PRECISION (mode)); - f->data.low = w.ulow (); - f->data.high = w.elt (1); - - if (temp == FIXED_MAX_EPS && ALL_FRACT_MODE_P (f->mode)) - { - /* From the spec, we need to evaluate 1 to the maximal value. */ - f->data.low = -1; - f->data.high = -1; - f->data = f->data.zext (GET_MODE_FBIT (f->mode) - + GET_MODE_IBIT (f->mode)); - } - else - f->data = f->data.ext (SIGNED_FIXED_POINT_MODE_P (f->mode) - + GET_MODE_FBIT (f->mode) - + GET_MODE_IBIT (f->mode), - UNSIGNED_FIXED_POINT_MODE_P (f->mode)); -} - -/* Render F as a decimal floating point constant. */ - -void -fixed_to_decimal (char *str, const FIXED_VALUE_TYPE *f_orig, - size_t buf_size) -{ - REAL_VALUE_TYPE real_value, base_value, fixed_value; - - signop sgn = UNSIGNED_FIXED_POINT_MODE_P (f_orig->mode) ? UNSIGNED : SIGNED; - real_2expN (&base_value, GET_MODE_FBIT (f_orig->mode), VOIDmode); - real_from_integer (&real_value, VOIDmode, - wide_int::from (f_orig->data, - GET_MODE_PRECISION (f_orig->mode), sgn), - sgn); - real_arithmetic (&fixed_value, RDIV_EXPR, &real_value, &base_value); - real_to_decimal (str, &fixed_value, buf_size, 0, 1); -} - -/* If SAT_P, saturate A to the maximum or the minimum, and save to *F based on - the machine mode MODE. - Do not modify *F otherwise. - This function assumes the width of double_int is greater than the width - of the fixed-point value (the sum of a possible sign bit, possible ibits, - and fbits). - Return true, if !SAT_P and overflow. */ - -static bool -fixed_saturate1 (machine_mode mode, double_int a, double_int *f, - bool sat_p) -{ - bool overflow_p = false; - bool unsigned_p = UNSIGNED_FIXED_POINT_MODE_P (mode); - int i_f_bits = GET_MODE_IBIT (mode) + GET_MODE_FBIT (mode); - - if (unsigned_p) /* Unsigned type. */ - { - double_int max; - max.low = -1; - max.high = -1; - max = max.zext (i_f_bits); - if (a.ugt (max)) - { - if (sat_p) - *f = max; - else - overflow_p = true; - } - } - else /* Signed type. */ - { - double_int max, min; - max.high = -1; - max.low = -1; - max = max.zext (i_f_bits); - min.high = 0; - min.low = 1; - min = min.alshift (i_f_bits, HOST_BITS_PER_DOUBLE_INT); - min = min.sext (1 + i_f_bits); - if (a.sgt (max)) - { - if (sat_p) - *f = max; - else - overflow_p = true; - } - else if (a.slt (min)) - { - if (sat_p) - *f = min; - else - overflow_p = true; - } - } - return overflow_p; -} - -/* If SAT_P, saturate {A_HIGH, A_LOW} to the maximum or the minimum, and - save to *F based on the machine mode MODE. - Do not modify *F otherwise. - This function assumes the width of two double_int is greater than the width - of the fixed-point value (the sum of a possible sign bit, possible ibits, - and fbits). - Return true, if !SAT_P and overflow. */ - -static bool -fixed_saturate2 (machine_mode mode, double_int a_high, double_int a_low, - double_int *f, bool sat_p) -{ - bool overflow_p = false; - bool unsigned_p = UNSIGNED_FIXED_POINT_MODE_P (mode); - int i_f_bits = GET_MODE_IBIT (mode) + GET_MODE_FBIT (mode); - - if (unsigned_p) /* Unsigned type. */ - { - double_int max_r, max_s; - max_r.high = 0; - max_r.low = 0; - max_s.high = -1; - max_s.low = -1; - max_s = max_s.zext (i_f_bits); - if (a_high.ugt (max_r) - || (a_high == max_r && - a_low.ugt (max_s))) - { - if (sat_p) - *f = max_s; - else - overflow_p = true; - } - } - else /* Signed type. */ - { - double_int max_r, max_s, min_r, min_s; - max_r.high = 0; - max_r.low = 0; - max_s.high = -1; - max_s.low = -1; - max_s = max_s.zext (i_f_bits); - min_r.high = -1; - min_r.low = -1; - min_s.high = 0; - min_s.low = 1; - min_s = min_s.alshift (i_f_bits, HOST_BITS_PER_DOUBLE_INT); - min_s = min_s.sext (1 + i_f_bits); - if (a_high.sgt (max_r) - || (a_high == max_r && - a_low.ugt (max_s))) - { - if (sat_p) - *f = max_s; - else - overflow_p = true; - } - else if (a_high.slt (min_r) - || (a_high == min_r && - a_low.ult (min_s))) - { - if (sat_p) - *f = min_s; - else - overflow_p = true; - } - } - return overflow_p; -} - -/* Return the sign bit based on I_F_BITS. */ - -static inline int -get_fixed_sign_bit (double_int a, int i_f_bits) -{ - if (i_f_bits < HOST_BITS_PER_WIDE_INT) - return (a.low >> i_f_bits) & 1; - else - return (a.high >> (i_f_bits - HOST_BITS_PER_WIDE_INT)) & 1; -} - -/* Calculate F = A + (SUBTRACT_P ? -B : B). - If SAT_P, saturate the result to the max or the min. - Return true, if !SAT_P and overflow. */ - -static bool -do_fixed_add (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a, - const FIXED_VALUE_TYPE *b, bool subtract_p, bool sat_p) -{ - bool overflow_p = false; - bool unsigned_p; - double_int temp; - int i_f_bits; - - /* This was a conditional expression but it triggered a bug in - Sun C 5.5. */ - if (subtract_p) - temp = -b->data; - else - temp = b->data; - - unsigned_p = UNSIGNED_FIXED_POINT_MODE_P (a->mode); - i_f_bits = GET_MODE_IBIT (a->mode) + GET_MODE_FBIT (a->mode); - f->mode = a->mode; - f->data = a->data + temp; - if (unsigned_p) /* Unsigned type. */ - { - if (subtract_p) /* Unsigned subtraction. */ - { - if (a->data.ult (b->data)) - { - if (sat_p) - { - f->data.high = 0; - f->data.low = 0; - } - else - overflow_p = true; - } - } - else /* Unsigned addition. */ - { - f->data = f->data.zext (i_f_bits); - if (f->data.ult (a->data) - || f->data.ult (b->data)) - { - if (sat_p) - { - f->data.high = -1; - f->data.low = -1; - } - else - overflow_p = true; - } - } - } - else /* Signed type. */ - { - if ((!subtract_p - && (get_fixed_sign_bit (a->data, i_f_bits) - == get_fixed_sign_bit (b->data, i_f_bits)) - && (get_fixed_sign_bit (a->data, i_f_bits) - != get_fixed_sign_bit (f->data, i_f_bits))) - || (subtract_p - && (get_fixed_sign_bit (a->data, i_f_bits) - != get_fixed_sign_bit (b->data, i_f_bits)) - && (get_fixed_sign_bit (a->data, i_f_bits) - != get_fixed_sign_bit (f->data, i_f_bits)))) - { - if (sat_p) - { - f->data.low = 1; - f->data.high = 0; - f->data = f->data.alshift (i_f_bits, HOST_BITS_PER_DOUBLE_INT); - if (get_fixed_sign_bit (a->data, i_f_bits) == 0) - { - --f->data; - } - } - else - overflow_p = true; - } - } - f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p); - return overflow_p; -} - -/* Calculate F = A * B. - If SAT_P, saturate the result to the max or the min. - Return true, if !SAT_P and overflow. */ - -static bool -do_fixed_multiply (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a, - const FIXED_VALUE_TYPE *b, bool sat_p) -{ - bool overflow_p = false; - bool unsigned_p = UNSIGNED_FIXED_POINT_MODE_P (a->mode); - int i_f_bits = GET_MODE_IBIT (a->mode) + GET_MODE_FBIT (a->mode); - f->mode = a->mode; - if (GET_MODE_PRECISION (f->mode) <= HOST_BITS_PER_WIDE_INT) - { - f->data = a->data * b->data; - f->data = f->data.lshift (-GET_MODE_FBIT (f->mode), - HOST_BITS_PER_DOUBLE_INT, !unsigned_p); - overflow_p = fixed_saturate1 (f->mode, f->data, &f->data, sat_p); - } - else - { - /* The result of multiplication expands to two double_int. */ - double_int a_high, a_low, b_high, b_low; - double_int high_high, high_low, low_high, low_low; - double_int r, s, temp1, temp2; - int carry = 0; - - /* Decompose a and b to four double_int. */ - a_high.low = a->data.high; - a_high.high = 0; - a_low.low = a->data.low; - a_low.high = 0; - b_high.low = b->data.high; - b_high.high = 0; - b_low.low = b->data.low; - b_low.high = 0; - - /* Perform four multiplications. */ - low_low = a_low * b_low; - low_high = a_low * b_high; - high_low = a_high * b_low; - high_high = a_high * b_high; - - /* Accumulate four results to {r, s}. */ - temp1.high = high_low.low; - temp1.low = 0; - s = low_low + temp1; - if (s.ult (low_low) - || s.ult (temp1)) - carry ++; /* Carry */ - temp1.high = s.high; - temp1.low = s.low; - temp2.high = low_high.low; - temp2.low = 0; - s = temp1 + temp2; - if (s.ult (temp1) - || s.ult (temp2)) - carry ++; /* Carry */ - - temp1.low = high_low.high; - temp1.high = 0; - r = high_high + temp1; - temp1.low = low_high.high; - temp1.high = 0; - r += temp1; - temp1.low = carry; - temp1.high = 0; - r += temp1; - - /* We need to subtract b from r, if a < 0. */ - if (!unsigned_p && a->data.high < 0) - r -= b->data; - /* We need to subtract a from r, if b < 0. */ - if (!unsigned_p && b->data.high < 0) - r -= a->data; - - /* Shift right the result by FBIT. */ - if (GET_MODE_FBIT (f->mode) == HOST_BITS_PER_DOUBLE_INT) - { - s.low = r.low; - s.high = r.high; - if (unsigned_p) - { - r.low = 0; - r.high = 0; - } - else - { - r.low = -1; - r.high = -1; - } - f->data.low = s.low; - f->data.high = s.high; - } - else - { - s = s.llshift ((-GET_MODE_FBIT (f->mode)), HOST_BITS_PER_DOUBLE_INT); - f->data = r.llshift ((HOST_BITS_PER_DOUBLE_INT - - GET_MODE_FBIT (f->mode)), - HOST_BITS_PER_DOUBLE_INT); - f->data.low = f->data.low | s.low; - f->data.high = f->data.high | s.high; - s.low = f->data.low; - s.high = f->data.high; - r = r.lshift (-GET_MODE_FBIT (f->mode), - HOST_BITS_PER_DOUBLE_INT, !unsigned_p); - } - - overflow_p = fixed_saturate2 (f->mode, r, s, &f->data, sat_p); - } - - f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p); - return overflow_p; -} - -/* Calculate F = A / B. - If SAT_P, saturate the result to the max or the min. - Return true, if !SAT_P and overflow. */ - -static bool -do_fixed_divide (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a, - const FIXED_VALUE_TYPE *b, bool sat_p) -{ - bool overflow_p = false; - bool unsigned_p = UNSIGNED_FIXED_POINT_MODE_P (a->mode); - int i_f_bits = GET_MODE_IBIT (a->mode) + GET_MODE_FBIT (a->mode); - f->mode = a->mode; - if (GET_MODE_PRECISION (f->mode) <= HOST_BITS_PER_WIDE_INT) - { - f->data = a->data.lshift (GET_MODE_FBIT (f->mode), - HOST_BITS_PER_DOUBLE_INT, !unsigned_p); - f->data = f->data.div (b->data, unsigned_p, TRUNC_DIV_EXPR); - overflow_p = fixed_saturate1 (f->mode, f->data, &f->data, sat_p); - } - else - { - double_int pos_a, pos_b, r, s; - double_int quo_r, quo_s, mod, temp; - int num_of_neg = 0; - int i; - - /* If a < 0, negate a. */ - if (!unsigned_p && a->data.high < 0) - { - pos_a = -a->data; - num_of_neg ++; - } - else - pos_a = a->data; - - /* If b < 0, negate b. */ - if (!unsigned_p && b->data.high < 0) - { - pos_b = -b->data; - num_of_neg ++; - } - else - pos_b = b->data; - - /* Left shift pos_a to {r, s} by FBIT. */ - if (GET_MODE_FBIT (f->mode) == HOST_BITS_PER_DOUBLE_INT) - { - r = pos_a; - s.high = 0; - s.low = 0; - } - else - { - s = pos_a.llshift (GET_MODE_FBIT (f->mode), HOST_BITS_PER_DOUBLE_INT); - r = pos_a.llshift (- (HOST_BITS_PER_DOUBLE_INT - - GET_MODE_FBIT (f->mode)), - HOST_BITS_PER_DOUBLE_INT); - } - - /* Divide r by pos_b to quo_r. The remainder is in mod. */ - quo_r = r.divmod (pos_b, 1, TRUNC_DIV_EXPR, &mod); - quo_s = double_int_zero; - - for (i = 0; i < HOST_BITS_PER_DOUBLE_INT; i++) - { - /* Record the leftmost bit of mod. */ - int leftmost_mod = (mod.high < 0); - - /* Shift left mod by 1 bit. */ - mod = mod.lshift (1); - - /* Test the leftmost bit of s to add to mod. */ - if (s.high < 0) - mod.low += 1; - - /* Shift left quo_s by 1 bit. */ - quo_s = quo_s.lshift (1); - - /* Try to calculate (mod - pos_b). */ - temp = mod - pos_b; - - if (leftmost_mod == 1 || mod.ucmp (pos_b) != -1) - { - quo_s.low += 1; - mod = temp; - } - - /* Shift left s by 1 bit. */ - s = s.lshift (1); - - } - - if (num_of_neg == 1) - { - quo_s = -quo_s; - if (quo_s.high == 0 && quo_s.low == 0) - quo_r = -quo_r; - else - { - quo_r.low = ~quo_r.low; - quo_r.high = ~quo_r.high; - } - } - - f->data = quo_s; - overflow_p = fixed_saturate2 (f->mode, quo_r, quo_s, &f->data, sat_p); - } - - f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p); - return overflow_p; -} - -/* Calculate F = A << B if LEFT_P. Otherwise, F = A >> B. - If SAT_P, saturate the result to the max or the min. - Return true, if !SAT_P and overflow. */ - -static bool -do_fixed_shift (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a, - const FIXED_VALUE_TYPE *b, bool left_p, bool sat_p) -{ - bool overflow_p = false; - bool unsigned_p = UNSIGNED_FIXED_POINT_MODE_P (a->mode); - int i_f_bits = GET_MODE_IBIT (a->mode) + GET_MODE_FBIT (a->mode); - f->mode = a->mode; - - if (b->data.low == 0) - { - f->data = a->data; - return overflow_p; - } - - if (GET_MODE_PRECISION (f->mode) <= HOST_BITS_PER_WIDE_INT || (!left_p)) - { - f->data = a->data.lshift (left_p ? b->data.low : -b->data.low, - HOST_BITS_PER_DOUBLE_INT, !unsigned_p); - if (left_p) /* Only left shift saturates. */ - overflow_p = fixed_saturate1 (f->mode, f->data, &f->data, sat_p); - } - else /* We need two double_int to store the left-shift result. */ - { - double_int temp_high, temp_low; - if (b->data.low == HOST_BITS_PER_DOUBLE_INT) - { - temp_high = a->data; - temp_low.high = 0; - temp_low.low = 0; - } - else - { - temp_low = a->data.lshift (b->data.low, - HOST_BITS_PER_DOUBLE_INT, !unsigned_p); - /* Logical shift right to temp_high. */ - temp_high = a->data.llshift (b->data.low - HOST_BITS_PER_DOUBLE_INT, - HOST_BITS_PER_DOUBLE_INT); - } - if (!unsigned_p && a->data.high < 0) /* Signed-extend temp_high. */ - temp_high = temp_high.ext (b->data.low, unsigned_p); - f->data = temp_low; - overflow_p = fixed_saturate2 (f->mode, temp_high, temp_low, &f->data, - sat_p); - } - f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p); - return overflow_p; -} - -/* Calculate F = -A. - If SAT_P, saturate the result to the max or the min. - Return true, if !SAT_P and overflow. */ - -static bool -do_fixed_neg (FIXED_VALUE_TYPE *f, const FIXED_VALUE_TYPE *a, bool sat_p) -{ - bool overflow_p = false; - bool unsigned_p = UNSIGNED_FIXED_POINT_MODE_P (a->mode); - int i_f_bits = GET_MODE_IBIT (a->mode) + GET_MODE_FBIT (a->mode); - f->mode = a->mode; - f->data = -a->data; - f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p); - - if (unsigned_p) /* Unsigned type. */ - { - if (f->data.low != 0 || f->data.high != 0) - { - if (sat_p) - { - f->data.low = 0; - f->data.high = 0; - } - else - overflow_p = true; - } - } - else /* Signed type. */ - { - if (!(f->data.high == 0 && f->data.low == 0) - && f->data.high == a->data.high && f->data.low == a->data.low ) - { - if (sat_p) - { - /* Saturate to the maximum by subtracting f->data by one. */ - f->data.low = -1; - f->data.high = -1; - f->data = f->data.zext (i_f_bits); - } - else - overflow_p = true; - } - } - return overflow_p; -} - -/* Perform the binary or unary operation described by CODE. - Note that OP0 and OP1 must have the same mode for binary operators. - For a unary operation, leave OP1 NULL. - Return true, if !SAT_P and overflow. */ - -bool -fixed_arithmetic (FIXED_VALUE_TYPE *f, int icode, const FIXED_VALUE_TYPE *op0, - const FIXED_VALUE_TYPE *op1, bool sat_p) -{ - switch (icode) - { - case NEGATE_EXPR: - return do_fixed_neg (f, op0, sat_p); - - case PLUS_EXPR: - gcc_assert (op0->mode == op1->mode); - return do_fixed_add (f, op0, op1, false, sat_p); - - case MINUS_EXPR: - gcc_assert (op0->mode == op1->mode); - return do_fixed_add (f, op0, op1, true, sat_p); - - case MULT_EXPR: - gcc_assert (op0->mode == op1->mode); - return do_fixed_multiply (f, op0, op1, sat_p); - - case TRUNC_DIV_EXPR: - gcc_assert (op0->mode == op1->mode); - return do_fixed_divide (f, op0, op1, sat_p); - - case LSHIFT_EXPR: - return do_fixed_shift (f, op0, op1, true, sat_p); - - case RSHIFT_EXPR: - return do_fixed_shift (f, op0, op1, false, sat_p); - - default: - gcc_unreachable (); - } -} - -/* Compare fixed-point values by tree_code. - Note that OP0 and OP1 must have the same mode. */ - -bool -fixed_compare (int icode, const FIXED_VALUE_TYPE *op0, - const FIXED_VALUE_TYPE *op1) -{ - enum tree_code code = (enum tree_code) icode; - gcc_assert (op0->mode == op1->mode); - - switch (code) - { - case NE_EXPR: - return op0->data != op1->data; - - case EQ_EXPR: - return op0->data == op1->data; - - case LT_EXPR: - return op0->data.cmp (op1->data, - UNSIGNED_FIXED_POINT_MODE_P (op0->mode)) == -1; - - case LE_EXPR: - return op0->data.cmp (op1->data, - UNSIGNED_FIXED_POINT_MODE_P (op0->mode)) != 1; - - case GT_EXPR: - return op0->data.cmp (op1->data, - UNSIGNED_FIXED_POINT_MODE_P (op0->mode)) == 1; - - case GE_EXPR: - return op0->data.cmp (op1->data, - UNSIGNED_FIXED_POINT_MODE_P (op0->mode)) != -1; - - default: - gcc_unreachable (); - } -} - -/* Extend or truncate to a new mode. - If SAT_P, saturate the result to the max or the min. - Return true, if !SAT_P and overflow. */ - -bool -fixed_convert (FIXED_VALUE_TYPE *f, scalar_mode mode, - const FIXED_VALUE_TYPE *a, bool sat_p) -{ - bool overflow_p = false; - if (mode == a->mode) - { - *f = *a; - return overflow_p; - } - - if (GET_MODE_FBIT (mode) > GET_MODE_FBIT (a->mode)) - { - /* Left shift a to temp_high, temp_low based on a->mode. */ - double_int temp_high, temp_low; - int amount = GET_MODE_FBIT (mode) - GET_MODE_FBIT (a->mode); - temp_low = a->data.lshift (amount, - HOST_BITS_PER_DOUBLE_INT, - SIGNED_FIXED_POINT_MODE_P (a->mode)); - /* Logical shift right to temp_high. */ - temp_high = a->data.llshift (amount - HOST_BITS_PER_DOUBLE_INT, - HOST_BITS_PER_DOUBLE_INT); - if (SIGNED_FIXED_POINT_MODE_P (a->mode) - && a->data.high < 0) /* Signed-extend temp_high. */ - temp_high = temp_high.sext (amount); - f->mode = mode; - f->data = temp_low; - if (SIGNED_FIXED_POINT_MODE_P (a->mode) == - SIGNED_FIXED_POINT_MODE_P (f->mode)) - overflow_p = fixed_saturate2 (f->mode, temp_high, temp_low, &f->data, - sat_p); - else - { - /* Take care of the cases when converting between signed and - unsigned. */ - if (SIGNED_FIXED_POINT_MODE_P (a->mode)) - { - /* Signed -> Unsigned. */ - if (a->data.high < 0) - { - if (sat_p) - { - f->data.low = 0; /* Set to zero. */ - f->data.high = 0; /* Set to zero. */ - } - else - overflow_p = true; - } - else - overflow_p = fixed_saturate2 (f->mode, temp_high, temp_low, - &f->data, sat_p); - } - else - { - /* Unsigned -> Signed. */ - if (temp_high.high < 0) - { - if (sat_p) - { - /* Set to maximum. */ - f->data.low = -1; /* Set to all ones. */ - f->data.high = -1; /* Set to all ones. */ - f->data = f->data.zext (GET_MODE_FBIT (f->mode) - + GET_MODE_IBIT (f->mode)); - /* Clear the sign. */ - } - else - overflow_p = true; - } - else - overflow_p = fixed_saturate2 (f->mode, temp_high, temp_low, - &f->data, sat_p); - } - } - } - else - { - /* Right shift a to temp based on a->mode. */ - double_int temp; - temp = a->data.lshift (GET_MODE_FBIT (mode) - GET_MODE_FBIT (a->mode), - HOST_BITS_PER_DOUBLE_INT, - SIGNED_FIXED_POINT_MODE_P (a->mode)); - f->mode = mode; - f->data = temp; - if (SIGNED_FIXED_POINT_MODE_P (a->mode) == - SIGNED_FIXED_POINT_MODE_P (f->mode)) - overflow_p = fixed_saturate1 (f->mode, f->data, &f->data, sat_p); - else - { - /* Take care of the cases when converting between signed and - unsigned. */ - if (SIGNED_FIXED_POINT_MODE_P (a->mode)) - { - /* Signed -> Unsigned. */ - if (a->data.high < 0) - { - if (sat_p) - { - f->data.low = 0; /* Set to zero. */ - f->data.high = 0; /* Set to zero. */ - } - else - overflow_p = true; - } - else - overflow_p = fixed_saturate1 (f->mode, f->data, &f->data, - sat_p); - } - else - { - /* Unsigned -> Signed. */ - if (temp.high < 0) - { - if (sat_p) - { - /* Set to maximum. */ - f->data.low = -1; /* Set to all ones. */ - f->data.high = -1; /* Set to all ones. */ - f->data = f->data.zext (GET_MODE_FBIT (f->mode) - + GET_MODE_IBIT (f->mode)); - /* Clear the sign. */ - } - else - overflow_p = true; - } - else - overflow_p = fixed_saturate1 (f->mode, f->data, &f->data, - sat_p); - } - } - } - - f->data = f->data.ext (SIGNED_FIXED_POINT_MODE_P (f->mode) - + GET_MODE_FBIT (f->mode) - + GET_MODE_IBIT (f->mode), - UNSIGNED_FIXED_POINT_MODE_P (f->mode)); - return overflow_p; -} - -/* Convert to a new fixed-point mode from an integer. - If UNSIGNED_P, this integer is unsigned. - If SAT_P, saturate the result to the max or the min. - Return true, if !SAT_P and overflow. */ - -bool -fixed_convert_from_int (FIXED_VALUE_TYPE *f, scalar_mode mode, - double_int a, bool unsigned_p, bool sat_p) -{ - bool overflow_p = false; - /* Left shift a to temp_high, temp_low. */ - double_int temp_high, temp_low; - int amount = GET_MODE_FBIT (mode); - if (amount == HOST_BITS_PER_DOUBLE_INT) - { - temp_high = a; - temp_low.low = 0; - temp_low.high = 0; - } - else - { - temp_low = a.llshift (amount, HOST_BITS_PER_DOUBLE_INT); - - /* Logical shift right to temp_high. */ - temp_high = a.llshift (amount - HOST_BITS_PER_DOUBLE_INT, - HOST_BITS_PER_DOUBLE_INT); - } - if (!unsigned_p && a.high < 0) /* Signed-extend temp_high. */ - temp_high = temp_high.sext (amount); - - f->mode = mode; - f->data = temp_low; - - if (unsigned_p == UNSIGNED_FIXED_POINT_MODE_P (f->mode)) - overflow_p = fixed_saturate2 (f->mode, temp_high, temp_low, &f->data, - sat_p); - else - { - /* Take care of the cases when converting between signed and unsigned. */ - if (!unsigned_p) - { - /* Signed -> Unsigned. */ - if (a.high < 0) - { - if (sat_p) - { - f->data.low = 0; /* Set to zero. */ - f->data.high = 0; /* Set to zero. */ - } - else - overflow_p = true; - } - else - overflow_p = fixed_saturate2 (f->mode, temp_high, temp_low, - &f->data, sat_p); - } - else - { - /* Unsigned -> Signed. */ - if (temp_high.high < 0) - { - if (sat_p) - { - /* Set to maximum. */ - f->data.low = -1; /* Set to all ones. */ - f->data.high = -1; /* Set to all ones. */ - f->data = f->data.zext (GET_MODE_FBIT (f->mode) - + GET_MODE_IBIT (f->mode)); - /* Clear the sign. */ - } - else - overflow_p = true; - } - else - overflow_p = fixed_saturate2 (f->mode, temp_high, temp_low, - &f->data, sat_p); - } - } - f->data = f->data.ext (SIGNED_FIXED_POINT_MODE_P (f->mode) - + GET_MODE_FBIT (f->mode) - + GET_MODE_IBIT (f->mode), - UNSIGNED_FIXED_POINT_MODE_P (f->mode)); - return overflow_p; -} - -/* Convert to a new fixed-point mode from a real. - If SAT_P, saturate the result to the max or the min. - Return true, if !SAT_P and overflow. */ - -bool -fixed_convert_from_real (FIXED_VALUE_TYPE *f, scalar_mode mode, - const REAL_VALUE_TYPE *a, bool sat_p) -{ - bool overflow_p = false; - REAL_VALUE_TYPE real_value, fixed_value, base_value; - bool unsigned_p = UNSIGNED_FIXED_POINT_MODE_P (mode); - int i_f_bits = GET_MODE_IBIT (mode) + GET_MODE_FBIT (mode); - unsigned int fbit = GET_MODE_FBIT (mode); - enum fixed_value_range_code temp; - bool fail; - - real_value = *a; - f->mode = mode; - real_2expN (&base_value, fbit, VOIDmode); - real_arithmetic (&fixed_value, MULT_EXPR, &real_value, &base_value); - - wide_int w = real_to_integer (&fixed_value, &fail, - GET_MODE_PRECISION (mode)); - f->data.low = w.ulow (); - f->data.high = w.elt (1); - temp = check_real_for_fixed_mode (&real_value, mode); - if (temp == FIXED_UNDERFLOW) /* Minimum. */ - { - if (sat_p) - { - if (unsigned_p) - { - f->data.low = 0; - f->data.high = 0; - } - else - { - f->data.low = 1; - f->data.high = 0; - f->data = f->data.alshift (i_f_bits, HOST_BITS_PER_DOUBLE_INT); - f->data = f->data.sext (1 + i_f_bits); - } - } - else - overflow_p = true; - } - else if (temp == FIXED_GT_MAX_EPS || temp == FIXED_MAX_EPS) /* Maximum. */ - { - if (sat_p) - { - f->data.low = -1; - f->data.high = -1; - f->data = f->data.zext (i_f_bits); - } - else - overflow_p = true; - } - f->data = f->data.ext ((!unsigned_p) + i_f_bits, unsigned_p); - return overflow_p; -} - -/* Convert to a new real mode from a fixed-point. */ - -void -real_convert_from_fixed (REAL_VALUE_TYPE *r, scalar_mode mode, - const FIXED_VALUE_TYPE *f) -{ - REAL_VALUE_TYPE base_value, fixed_value, real_value; - - signop sgn = UNSIGNED_FIXED_POINT_MODE_P (f->mode) ? UNSIGNED : SIGNED; - real_2expN (&base_value, GET_MODE_FBIT (f->mode), VOIDmode); - real_from_integer (&fixed_value, VOIDmode, - wide_int::from (f->data, GET_MODE_PRECISION (f->mode), - sgn), sgn); - real_arithmetic (&real_value, RDIV_EXPR, &fixed_value, &base_value); - real_convert (r, mode, &real_value); -} - -/* Determine whether a fixed-point value F is negative. */ - -bool -fixed_isneg (const FIXED_VALUE_TYPE *f) -{ - if (SIGNED_FIXED_POINT_MODE_P (f->mode)) - { - int i_f_bits = GET_MODE_IBIT (f->mode) + GET_MODE_FBIT (f->mode); - int sign_bit = get_fixed_sign_bit (f->data, i_f_bits); - if (sign_bit == 1) - return true; - } - - return false; -} |