82 lines
1.2 KiB
C
82 lines
1.2 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 "instrs.h"
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#include "arch_i.h"
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IMPL_COND(inc);
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IMPL_COND(dec);
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IMPL_COND(add);
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IMPL_COND(sub);
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IMPL_COND(mul);
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IMPL_COND(div);
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IMPL_COND(sgn);
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//
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// Unsigned arithmetic instructions
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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(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_1(mul)
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{
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// Adapted from www.codeproject.com/Tips/618570/UInt-Multiplication-Squaring
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ulong v2 = v1;
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v1 = ctx->r[RAX].val;
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ulong u1 = (v1 & 0xffffffff);
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ulong u2 = (v2 & 0xffffffff);
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ulong t = (u1 * u2);
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ulong w3 = (t & 0xffffffff);
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ulong k = (t >> 32);
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v1 >>= 32;
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t = (v1 * u2) + k;
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k = (t & 0xffffffff);
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ulong w1 = (t >> 32);
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v2 >>= 32;
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t = (u1 * v2) + k;
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k = (t >> 32);
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ctx->r[RDX].val = (v1 * v2) + w1 + k;
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ctx->r[RAX].val = (t << 32) + w3;
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}
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IMPL_END;
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IMPL_START_1(div)
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{
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ctx->r[RDX].val = ctx->r[RAX].val % v1;
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ctx->r[RAX].val = ctx->r[RAX].val / v1;
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}
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IMPL_END;
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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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IMPL_START_2(sgn)
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{
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v1 = (v2 ? ((long)v2 > 0 ? 1 : (ulong)-1L) : 0);
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}
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IMPL_OUT;
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