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+/*
+ * QEMU TILE-Gx helpers
+ *
+ * Copyright (c) 2015 Chen Gang
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see
+ * <http://www.gnu.org/licenses/lgpl-2.1.html>
+ */
+
+#include "cpu.h"
+#include "qemu-common.h"
+#include "exec/helper-proto.h"
+#include "fpu/softfloat.h"
+
+#include "helper-fshared.h"
+
+/*
+ * FDouble instructions implemenation:
+ *
+ * fdouble_unpack_min ; srca and srcb are float_64 value.
+ * ; get the min absolute value's mantissa.
+ * ; move "mantissa >> (exp_max - exp_min)" to dest.
+ *
+ * fdouble_unpack_max ; srca and srcb are float_64 value.
+ * ; get the max absolute value's mantissa.
+ * ; move mantissa to dest.
+ *
+ * fdouble_add_flags ; srca and srcb are float_64 value.
+ * ; calc exp (exp_max), sign, and comp bits for flags.
+ * ; set addsub bit to flags and move flags to dest.
+ *
+ * fdouble_sub_flags ; srca and srcb are float_64 value.
+ * ; calc exp (exp_max), sign, and comp bits for flags.
+ * ; set addsub bit to flags and move flags to dest.
+ *
+ * fdouble_addsub: ; dest, srca (max, min mantissa), and srcb (flags).
+ * ; "dest +/- srca" depend on the add/sub bit of flags.
+ * ; move result mantissa to dest.
+ *
+ * fdouble_mul_flags: ; srca and srcb are float_64 value.
+ * ; calc sign (xor), exp (min + max), and comp bits.
+ * ; mix sign, exp, and comp bits as flags to dest.
+ *
+ * fdouble_pack1 ; move srcb (flags) to dest.
+ *
+ * fdouble_pack2 ; srca, srcb (high, low mantissa), and dest (flags)
+ * ; normalize and pack result from srca, srcb, and dest.
+ * ; move result to dest.
+ */
+
+#define TILEGX_F_EXP_DZERO 0x3ff /* Zero exp for double 11-bits */
+#define TILEGX_F_EXP_DMAX 0x7fe /* max exp for double 11-bits */
+#define TILEGX_F_EXP_DUF 0x1000/* underflow exp bit for double */
+
+#define TILEGX_F_MAN_HBIT (1ULL << 59)
+
+#define TILEGX_F_CALC_ADD 1 /* Perform absolute add operation */
+#define TILEGX_F_CALC_SUB 2 /* Perform absolute sub operation */
+#define TILEGX_F_CALC_MUL 3 /* Perform absolute mul operation */
+
+static uint32_t get_f64_exp(float64 d)
+{
+ return extract64(float64_val(d), 52, 11);
+}
+
+static void set_f64_exp(float64 *d, uint32_t exp)
+{
+ *d = make_float64(deposit64(float64_val(*d), 52, 11, exp));
+}
+
+static uint64_t get_f64_man(float64 d)
+{
+ return extract64(float64_val(d), 0, 52);
+}
+
+static uint64_t fr_to_man(float64 d)
+{
+ uint64_t val = get_f64_man(d) << 7;
+
+ if (get_f64_exp(d)) {
+ val |= TILEGX_F_MAN_HBIT; /* Restore HBIT for the next calculation */
+ }
+
+ return val;
+}
+
+static uint64_t get_fdouble_man(uint64_t n)
+{
+ return extract64(n, 0, 60);
+}
+
+static void set_fdouble_man(uint64_t *n, uint64_t man)
+{
+ *n = deposit64(*n, 0, 60, man);
+}
+
+static uint64_t get_fdouble_man_of(uint64_t n)
+{
+ return test_bit(60, &n);
+}
+
+static void clear_fdouble_man_of(uint64_t *n)
+{
+ return clear_bit(60, n);
+}
+
+static uint32_t get_fdouble_nan(uint64_t n)
+{
+ return test_bit(24, &n);
+}
+
+static void set_fdouble_nan(uint64_t *n)
+{
+ set_bit(24, n);
+}
+
+static uint32_t get_fdouble_inf(uint64_t n)
+{
+ return test_bit(23, &n);
+}
+
+static void set_fdouble_inf(uint64_t *n)
+{
+ set_bit(23, n);
+}
+
+static uint32_t get_fdouble_calc(uint64_t n)
+{
+ return extract32(n, 21, 2);
+}
+
+static void set_fdouble_calc(uint64_t *n, uint32_t calc)
+{
+ *n = deposit64(*n, 21, 2, calc);
+}
+
+static uint32_t get_fdouble_sign(uint64_t n)
+{
+ return test_bit(20, &n);
+}
+
+static void set_fdouble_sign(uint64_t *n)
+{
+ set_bit(20, n);
+}
+
+static uint32_t get_fdouble_vexp(uint64_t n)
+{
+ return extract32(n, 7, 13);
+}
+
+static void set_fdouble_vexp(uint64_t *n, uint32_t vexp)
+{
+ *n = deposit64(*n, 7, 13, vexp);
+}
+
+static uint64_t shift64RightJamming(uint64_t a, int_fast16_t count)
+{
+ if (count == 0) {
+ return a;
+ } else if (count < 64) {
+ return (a >> count) | ((a << ((0 - count) & 63)) != 0);
+ }
+ return (a != 0);
+}
+
+uint64_t helper_fdouble_unpack_min(uint64_t srca, uint64_t srcb)
+{
+ uint64_t v = 0;
+ uint32_t expa = get_f64_exp(srca);
+ uint32_t expb = get_f64_exp(srcb);
+
+ if (float64_is_any_nan(srca) || float64_is_any_nan(srcb)
+ || float64_is_infinity(srca) || float64_is_infinity(srcb)) {
+ return 0;
+ } else if (expa > expb) {
+ set_fdouble_man(&v, shift64RightJamming(fr_to_man(srcb), expa - expb));
+ } else if (expa < expb) {
+ set_fdouble_man(&v, shift64RightJamming(fr_to_man(srca), expb - expa));
+ } else if (get_f64_man(srca) > get_f64_man(srcb)) {
+ set_fdouble_man(&v, fr_to_man(srcb));
+ } else {
+ set_fdouble_man(&v, fr_to_man(srca));
+ }
+
+ return v;
+}
+
+uint64_t helper_fdouble_unpack_max(uint64_t srca, uint64_t srcb)
+{
+ uint64_t v = 0;
+ uint32_t expa = get_f64_exp(srca);
+ uint32_t expb = get_f64_exp(srcb);
+
+ if (float64_is_any_nan(srca) || float64_is_any_nan(srcb)
+ || float64_is_infinity(srca) || float64_is_infinity(srcb)) {
+ return 0;
+ } else if (expa > expb) {
+ set_fdouble_man(&v, fr_to_man(srca));
+ } else if (expa < expb) {
+ set_fdouble_man(&v, fr_to_man(srcb));
+ } else if (get_f64_man(srca) > get_f64_man(srcb)) {
+ set_fdouble_man(&v, fr_to_man(srca));
+ } else {
+ set_fdouble_man(&v, fr_to_man(srcb));
+ }
+
+ return v;
+}
+
+uint64_t helper_fdouble_addsub(uint64_t dest, uint64_t srca, uint64_t srcb)
+{
+ if (get_fdouble_calc(srcb) == TILEGX_F_CALC_ADD) {
+ return dest + srca; /* maybe set addsub overflow bit */
+ } else {
+ return dest - srca;
+ }
+}
+
+/* absolute-add/mul may cause add/mul carry or overflow */
+static bool proc_oflow(uint64_t *flags, uint64_t *v, uint64_t *srcb)
+{
+ if (get_fdouble_man_of(*v)) {
+ set_fdouble_vexp(flags, get_fdouble_vexp(*flags) + 1);
+ *srcb >>= 1;
+ *srcb |= *v << 63;
+ *v >>= 1;
+ clear_fdouble_man_of(v);
+ }
+ return get_fdouble_vexp(*flags) > TILEGX_F_EXP_DMAX;
+}
+
+uint64_t helper_fdouble_pack2(uint64_t flags, uint64_t srca, uint64_t srcb)
+{
+ DEC_INIT_FPSTATUS;
+ uint64_t v = srca;
+ float64 d = float64_set_sign(float64_zero, get_fdouble_sign(flags));
+
+ if (get_fdouble_nan(flags)) {
+ return float64_val(float64_default_nan);
+ } else if (get_fdouble_inf(flags)) {
+ return float64_val(d | float64_infinity);
+ }
+
+ /* absolute-mul needs left shift 4 + 1 bytes to match the real mantissa */
+ if (get_fdouble_calc(flags) == TILEGX_F_CALC_MUL) {
+ v <<= 5;
+ v |= srcb >> 59;
+ srcb <<= 5;
+ }
+ v |= (srcb != 0);
+
+ /* must check underflow, firstly */
+ if (get_fdouble_vexp(flags) & TILEGX_F_EXP_DUF) {
+ return float64_val(d);
+ }
+
+ if (proc_oflow(&flags, &v, &srcb)) {
+ return float64_val(d | float64_infinity);
+ }
+
+ while (!(get_fdouble_man(v) & TILEGX_F_MAN_HBIT)
+ && (get_fdouble_man(v) | srcb)) {
+ set_fdouble_vexp(&flags, get_fdouble_vexp(flags) - 1);
+ set_fdouble_man(&v, get_fdouble_man(v) << 1);
+ set_fdouble_man(&v, get_fdouble_man(v) | (srcb >> 63));
+ srcb <<= 1;
+ }
+
+ /* check underflow, again, after format */
+ if ((get_fdouble_vexp(flags) & TILEGX_F_EXP_DUF) || !get_fdouble_man(v)) {
+ return float64_val(d);
+ }
+
+ if (get_fdouble_sign(flags)) {
+ d = int64_to_float64(0 - get_fdouble_man(v), &fp_status);
+ } else {
+ d = uint64_to_float64(get_fdouble_man(v), &fp_status);
+ }
+
+ if (get_f64_exp(d) == 59 + TILEGX_F_EXP_DZERO) {
+ set_f64_exp(&d, get_fdouble_vexp(flags));
+ } else { /* for carry and overflow again */
+ set_f64_exp(&d, get_fdouble_vexp(flags) + 1);
+ if (get_f64_exp(d) == TILEGX_F_EXP_DMAX) {
+ d = float64_infinity;
+ }
+ }
+
+ d = float64_set_sign(d, get_fdouble_sign(flags));
+
+ return float64_val(d);
+}
+
+static uint64_t main_calc(float64 fsrca, float64 fsrcb,
+ float64 (*calc)(float64, float64, float_status*))
+{
+ DEC_INIT_FPSTATUS;
+ float64 d;
+ uint64_t flags = 0;
+ uint32_t expa = get_f64_exp(fsrca);
+ uint32_t expb = get_f64_exp(fsrcb);
+
+ if (float64_eq(fsrca, fsrcb, &fp_status)) {
+ flags |= create_fsfd_flag_eq();
+ } else {
+ flags |= create_fsfd_flag_ne();
+ }
+
+ if (float64_lt(fsrca, fsrcb, &fp_status)) {
+ flags |= create_fsfd_flag_lt();
+ }
+ if (float64_le(fsrca, fsrcb, &fp_status)) {
+ flags |= create_fsfd_flag_le();
+ }
+
+ if (float64_lt(fsrcb, fsrca, &fp_status)) {
+ flags |= create_fsfd_flag_gt();
+ }
+ if (float64_le(fsrcb, fsrca, &fp_status)) {
+ flags |= create_fsfd_flag_ge();
+ }
+
+ if (float64_unordered(fsrca, fsrcb, &fp_status)) {
+ flags |= create_fsfd_flag_un();
+ }
+
+ d = calc(fsrca, fsrcb, &fp_status);
+ if (float64_is_neg(d)) {
+ set_fdouble_sign(&flags);
+ }
+
+ if (float64_is_any_nan(d)) {
+ set_fdouble_nan(&flags);
+ } else if (float64_is_infinity(d)) {
+ set_fdouble_inf(&flags);
+ } else if (calc == float64_add) {
+ set_fdouble_vexp(&flags, (expa > expb) ? expa : expb);
+ set_fdouble_calc(&flags,
+ (float64_is_neg(fsrca) == float64_is_neg(fsrcb))
+ ? TILEGX_F_CALC_ADD : TILEGX_F_CALC_SUB);
+
+ } else if (calc == float64_sub) {
+ set_fdouble_vexp(&flags, (expa > expb) ? expa : expb);
+ set_fdouble_calc(&flags,
+ (float64_is_neg(fsrca) != float64_is_neg(fsrcb))
+ ? TILEGX_F_CALC_ADD : TILEGX_F_CALC_SUB);
+
+ } else {
+ set_fdouble_vexp(&flags, (int64_t)(expa - TILEGX_F_EXP_DZERO)
+ + (int64_t)(expb - TILEGX_F_EXP_DZERO)
+ + TILEGX_F_EXP_DZERO);
+ set_fdouble_calc(&flags, TILEGX_F_CALC_MUL);
+ }
+
+ return flags;
+}
+
+uint64_t helper_fdouble_add_flags(uint64_t srca, uint64_t srcb)
+{
+ return main_calc(make_float64(srca), make_float64(srcb), float64_add);
+}
+
+uint64_t helper_fdouble_sub_flags(uint64_t srca, uint64_t srcb)
+{
+ return main_calc(make_float64(srca), make_float64(srcb), float64_sub);
+}
+
+uint64_t helper_fdouble_mul_flags(uint64_t srca, uint64_t srcb)
+{
+ return main_calc(make_float64(srca), make_float64(srcb), float64_mul);
+}