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mirror of https://gitlab.os-k.eu/os-k-team/kvisc.git synced 2023-08-25 14:05:46 +02:00
kvisc/vm/in/arith.c
2019-06-12 15:30:35 +02:00

227 lines
3.2 KiB
C

// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include <in/instrs.h>
//--------------------------------------------------------------------------
IMPL_START_2(sgn)
{
v1 = (long)v2 < 0 ? (ulong)-1L : 1;
}
IMPL_OUT;
IMPL_START_2(sgnf)
{
v1 = (long)v2 < 0 ? (ulong)-1L : 1;
}
IMPL_OUT_ZSF;
IMPL_START_1(neg)
{
v1 = ~v1 + 1;
}
IMPL_OUT;
IMPL_START_1(negf)
{
if (v1 == 0) flg |= CF;
else {
flg &= ~CF;
if (v1 == LONG_MIN) flg |= OF;
else flg &= ~OF;
}
v1 = ~v1 + 1;
}
IMPL_OUT_ZSF;
//--------------------------------------------------------------------------
IMPL_START_1(inc)
{
v1++;
}
IMPL_OUT;
IMPL_START_1(incf)
{
if (v1 == LONG_MAX) flg |= OF;
else flg &= ~OF;
v1++;
}
IMPL_OUT_ZSF;
IMPL_START_1(dec)
{
v1--;
}
IMPL_OUT;
IMPL_START_1(decf)
{
if (v1 == LONG_MIN) flg |= OF;
else flg &= ~OF;
v1--;
}
IMPL_OUT_ZSF;
//--------------------------------------------------------------------------
IMPL_START_2(add)
{
v1 += v2;
}
IMPL_OUT;
IMPL_START_2(addf)
{
if (v1 + v2 < v1) flg |= OF;
else flg &= ~OF;
if ( ((v2 > 0) && (v1 > LONG_MAX - v2))
|| ((v2 < 0) && (v1 < LONG_MIN - v2)) )
flg |= CF;
else flg &= ~CF;
v1 += v2;
}
IMPL_OUT_ZSF;
IMPL_START_2(sub)
{
v1 -= v2;
}
IMPL_OUT;
IMPL_START_2(subf)
{
if (v1 < v2) flg |= CF;
else flg &= ~CF;
if ( ((v2 < 0) && (v1 > LONG_MAX + v2))
|| ((v2 > 0) && (v1 < LONG_MIN + v2)) )
flg |= OF;
else flg &= ~OF;
v1 -= v2;
}
IMPL_OUT_ZSF;
//
// i_subf but discards result
//
IMPL_START_2(cmp)
{
if (v1 < v2) flg |= CF;
else flg &= ~CF;
if ( ((v2 < 0) && (v1 > LONG_MAX + v2))
|| ((v2 > 0) && (v1 < LONG_MIN + v2)) )
flg |= OF;
else flg &= ~OF;
SET_ZSF(v1 - v2);
}
IMPL_END;
//--------------------------------------------------------------------------
//
// www.codeproject.com/Tips/618570/UInt-Multiplication-Squaring
//
static void multiply(ulong u, ulong v, ulong *hi, ulong *lo)
{
ulong u1 = (u & 0xffffffff);
ulong v1 = (v & 0xffffffff);
ulong t = (u1 * v1);
ulong w3 = (t & 0xffffffff);
ulong k = (t >> 32);
u >>= 32;
t = (u * v1) + k;
k = (t & 0xffffffff);
ulong w1 = (t >> 32);
v >>= 32;
t = (u1 * v) + k;
k = (t >> 32);
*hi = (u * v) + w1 + k;
*lo = (t << 32) + w3;
}
IMPL_START_2(mul)
{
ulong hi;
multiply(v1, v2, &hi, &v1);
}
IMPL_OUT;
IMPL_START_2(mulf)
{
ulong hi;
multiply(v1, v2, &hi, &v1);
if (hi > 0) {
flg |= CF;
flg |= OF;
}
else {
flg &= ~CF;
flg &= ~OF;
}
}
IMPL_OUT;
IMPL_START_1(mul2)
{
multiply(rax, v1, &rdx, &rax);
}
IMPL_END;
IMPL_START_1(mul2f)
{
multiply(rax, v1, &rdx, &rax);
if (rdx > 0) {
flg |= CF;
flg |= OF;
}
else {
flg &= ~CF;
flg &= ~OF;
}
}
IMPL_END;
//--------------------------------------------------------------------------
IMPL_START_2(div)
{
v1 /= v2;
}
IMPL_OUT;
IMPL_START_2(mod)
{
v1 %= v2;
}
IMPL_OUT;
IMPL_START_1(div2)
{
rdx = rax % v1;
rax = rax / v1;
}
IMPL_END;