39 lines
1.1 KiB
C
39 lines
1.1 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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#define STR_MOVE(reg, len) \
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if (!(R(RFX) & DF)) R(reg) += len; \
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else R(reg) -= len;
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//----------------------------------------------------------------------------//
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static void scas_impl(acc_t *p1, acc_t *p2, uint len)
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{
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if (p1->type != A_REG)
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_except(E_ILL, "SCASX given a non-REG operand");
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while (R(RCX) > 0)
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{
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ulong x = readmemzx(R(p1->reg), len);
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if (x == 0 || x == p2->val)
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break;
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R(p1->reg) += len;
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R(RCX)--;
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}
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}
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IMPL_START(scasb, 2) { scas_impl(p1, p2, 1); return 0; }
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IMPL_START(scasw, 2) { scas_impl(p1, p2, 2); return 0; }
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IMPL_START(scasd, 2) { scas_impl(p1, p2, 4); return 0; }
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IMPL_START(scasq, 2) { scas_impl(p1, p2, 8); return 0; }
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//----------------------------------------------------------------------------//
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