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