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kvisc/pc/instrs/logic.c
2019-05-29 16:57:22 +02:00

79 lines
958 B
C

// The OS/K Team licences this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "instrs.h"
#include "arch_i.h"
//
// Comparison instructions
//
IMPL_START_2(test)
{
ulong v = v1 & v2;
if (v == 0) ctx->r[FLG].val |= ZF;
else ctx->r[FLG].val &= ~ZF;
}
IMPL_END;
IMPL_START_2(cmp)
{
if (v1 == v2) {
ctx->r[FLG].val |= ZF;
ctx->r[FLG].val &= ~CF;
}
else if (v1 < v2) {
ctx->r[FLG].val &= ~ZF;
ctx->r[FLG].val |= CF;
}
else {
ctx->r[FLG].val &= ~ZF;
ctx->r[FLG].val &= ~CF;
}
}
IMPL_END;
//
// Logical instructions
//
IMPL_START_2(and)
{
v1 &= v2;
}
IMPL_OUT;
IMPL_START_2(or)
{
v1 |= v2;
}
IMPL_OUT;
IMPL_START_2(xor)
{
v1 ^= v2;
}
IMPL_OUT;
IMPL_START_2(shl)
{
v1 <<= v2;
}
IMPL_OUT;
IMPL_START_2(shr)
{
v1 >>= v2;
}
IMPL_OUT;
IMPL_START_1(not)
{
v1 = ~v1;
}
IMPL_OUT;