39 lines
859 B
C++
39 lines
859 B
C++
//: helper for division operations: sign-extend EAX into EDX
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:(before "End Initialize Op Names")
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put_new(Name, "99", "sign-extend EAX into EDX (cdq)");
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:(code)
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void test_cdq() {
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Reg[EAX].i = 10;
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run(
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"== code 0x1\n"
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"99\n"
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);
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CHECK_TRACE_CONTENTS(
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"run: sign-extend EAX into EDX\n"
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"run: EDX is now 0x00000000\n"
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);
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}
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:(before "End Single-Byte Opcodes")
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case 0x99: { // sign-extend EAX into EDX
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trace(Callstack_depth+1, "run") << "sign-extend EAX into EDX" << end();
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Reg[EDX].i = (Reg[EAX].i < 0) ? -1 : 0;
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trace(Callstack_depth+1, "run") << "EDX is now 0x" << HEXWORD << Reg[EDX].u << end();
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break;
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}
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:(code)
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void test_cdq_negative() {
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Reg[EAX].i = -10;
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run(
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"== code 0x1\n"
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"99\n"
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);
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CHECK_TRACE_CONTENTS(
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"run: sign-extend EAX into EDX\n"
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"run: EDX is now 0xffffffff\n"
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);
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}
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