191 lines
2.9 KiB
C
191 lines
2.9 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(neg)
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{
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v1 = ~v2 + 1;
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}
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IMPL_OUT;
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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(dec)
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{
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v1--;
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}
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IMPL_OUT;
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//----------------------------------------------------------------------------//
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IMPL_START_2(add)
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{
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ALU_GET_SRCS();
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v1 = src1 + src2;
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}
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IMPL_OUT;
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IMPL_START_2(xadd)
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{
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ulong tmp = v1;
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v1 += v2;
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v2 = tmp;
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}
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IMPL_OUT_2;
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IMPL_START_2(addf)
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{
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ALU_GET_SRCS();
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COMPARE(src1, ~src2+1);
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v1 = src1 + src2;
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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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ALU_GET_SRCS();
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v1 = src1 - src2;
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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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ALU_GET_SRCS();
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COMPARE(src1, src2);
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v1 = src1 - src2;
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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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IMPL_START_2(adc)
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{
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ALU_GET_SRCS();
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v1 = src1 + src2 + !!(rfx&CF);
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}
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IMPL_OUT;
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IMPL_START_2(ado)
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{
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ALU_GET_SRCS();
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v1 = src1 + src2 + !!(rfx&OF);
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}
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IMPL_OUT;
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IMPL_START_2(sbb)
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{
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ALU_GET_SRCS();
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v1 = src1 - src2 - !!(rfx&CF);
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}
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IMPL_OUT;
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IMPL_START_2(sbo)
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{
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ALU_GET_SRCS();
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v1 = src1 - src2 - !!(rfx&OF);
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}
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IMPL_OUT;
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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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if (hi) *hi = (u * v) + w1 + k;
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if (lo) *lo = (t << 32) + w3;
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}
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IMPL_START_2(mul)
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{
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ALU_GET_SRCS();
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multiply(src1, src2, 0, &v1);
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}
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IMPL_OUT;
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IMPL_START_2(mulhi)
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{
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ALU_GET_SRCS();
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multiply(src1, src2, &v1, &v2);
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}
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IMPL_OUT_2;
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IMPL_START_2(mulf)
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{
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ALU_GET_SRCS();
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multiply(src1, src2, &v2, &v1);
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if (v2 > 0) {
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rfx |= CF;
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rfx |= OF;
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}
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else {
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rfx &= ~CF;
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rfx &= ~OF;
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}
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}
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IMPL_OUT;
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//----------------------------------------------------------------------------//
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IMPL_START_2(div)
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{
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ALU_GET_SRCS();
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v1 = src1 / src2;
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}
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IMPL_OUT;
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IMPL_START_2(rem)
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{
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ALU_GET_SRCS();
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v1 = src1 % src2;
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}
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IMPL_OUT;
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//----------------------------------------------------------------------------//
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