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Implement RCR.

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This commit is contained in:
Thomas Harte 2023-10-13 21:44:48 -04:00
parent 6f7991f54a
commit f45d8bcbdb
2 changed files with 54 additions and 6 deletions
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50
InstructionSets/x86/Implementation/PerformImplementation.hpp
View File

@ -923,7 +923,7 @@ void setmoc(IntT &destination, uint8_t cl, Status &status) {
if(cl) setmo(destination, status);
}
template <Model model, typename IntT>
template <typename IntT>
inline void rcl(IntT &destination, uint8_t count, Status &status) {
/*
(* RCL and RCR instructions *)
@ -954,7 +954,7 @@ inline void rcl(IntT &destination, uint8_t count, Status &status) {
The OF flag is affected only for single- bit rotates (see “Description” above);
it is undefined for multi-bit rotates. The SF, ZF, AF, and PF flags are not affected.
*/
auto temp_count = count % (Numeric::bit_size<IntT>() + 1);
const auto temp_count = count % (Numeric::bit_size<IntT>() + 1);
auto carry = status.carry_bit<IntT>();
switch(temp_count) {
case 0: break;
@ -979,6 +979,49 @@ inline void rcl(IntT &destination, uint8_t count, Status &status) {
);
}
template <typename IntT>
inline void rcr(IntT &destination, uint8_t count, Status &status) {
/*
(* RCR instruction operation *)
IF COUNT = 1
THEN OF ← MSB(DEST) XOR CF;
ELSE OF is undefined;
FI;
WHILE (tempCOUNT ≠ 0)
DO
tempCF ← LSB(SRC);
DEST ← (DEST / 2) + (CF * 2SIZE);
CF ← tempCF;
tempCOUNT ← tempCOUNT – 1;
OD;
*/
auto carry = status.carry_bit<IntT>();
status.set_from<Flag::Overflow>(
((destination >> (Numeric::bit_size<IntT>() - 1)) & 1) ^ carry
);
const auto temp_count = count % (Numeric::bit_size<IntT>() + 1);
switch(temp_count) {
case 0: break;
case Numeric::bit_size<IntT>(): {
const IntT temp_carry = destination & Numeric::top_bit<IntT>();
destination = (destination << 1) | carry;
carry = temp_carry;
} break;
default: {
const IntT temp_carry = destination & (1 << (temp_count - 1));
destination =
(destination >> temp_count) |
(destination << (Numeric::bit_size<IntT>() + 1 - temp_count)) |
(carry << (Numeric::bit_size<IntT>() - temp_count));
carry = temp_carry;
} break;
}
status.set_from<Flag::Carry>(carry);
}
}
template <
@ -1140,7 +1183,8 @@ template <
case Operation::JLE: jcc(status.condition<Condition::LessOrEqual>()); return;
case Operation::JNLE: jcc(!status.condition<Condition::LessOrEqual>()); return;
case Operation::RCL: Primitive::rcl<model>(destination(), shift_count(), status); break;
case Operation::RCL: Primitive::rcl(destination(), shift_count(), status); break;
case Operation::RCR: Primitive::rcr(destination(), shift_count(), status); break;
case Operation::CLC: Primitive::clc(status); return;
case Operation::CLD: Primitive::cld(status); return;

10
OSBindings/Mac/Clock SignalTests/8088Tests.mm
View File

@ -418,11 +418,15 @@ struct FailedExecution {
*/
// TODO: POP, POPF, PUSH, PUSHF
// TODO: RCR, ROL, ROR, SAL, SAR, SHR
// TODO: ROL, ROR, SAL, SAR, SHR
// RCL
@"D0.2.json.gz", @"D2.2.json.gz",
@"D1.2.json.gz", @"D3.2.json.gz",
// @"D0.2.json.gz", @"D2.2.json.gz",
// @"D1.2.json.gz", @"D3.2.json.gz",
// RCR
@"D0.3.json.gz", @"D2.3.json.gz",
@"D1.3.json.gz", @"D3.3.json.gz",
/*
@"F8.json.gz", // CLC