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Implement SHR.

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This commit is contained in:
Thomas Harte 2023-10-16 12:34:11 -04:00
parent e38fe7dffc
commit f1779e6067
2 changed files with 46 additions and 32 deletions
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22
InstructionSets/x86/Implementation/PerformImplementation.hpp
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@ -1217,6 +1217,27 @@ inline void sar(IntT &destination, uint8_t count, Status &status) {
status.set_from<IntT, Flag::Sign, Flag::Zero, Flag::ParityOdd>(destination);
}
template <typename IntT>
inline void shr(IntT &destination, uint8_t count, Status &status) {
if(!count) {
return;
}
status.set_from<Flag::Overflow>(Numeric::top_bit<IntT>() & destination);
if(count == Numeric::bit_size<IntT>()) {
status.set_from<Flag::Carry>(Numeric::top_bit<IntT>() & destination);
destination = 0;
} else if(count > Numeric::bit_size<IntT>()) {
status.set_from<Flag::Carry>(0);
destination = 0;
} else {
const IntT mask = 1 << (count - 1);
status.set_from<Flag::Carry>(destination & mask);
destination >>= count;
}
status.set_from<IntT, Flag::Sign, Flag::Zero, Flag::ParityOdd>(destination);
}
}
template <
@ -1384,6 +1405,7 @@ template <
case Operation::ROR: Primitive::ror(destination(), shift_count(), status); break;
case Operation::SAL: Primitive::sal(destination(), shift_count(), status); break;
case Operation::SAR: Primitive::sar(destination(), shift_count(), status); break;
case Operation::SHR: Primitive::shr(destination(), shift_count(), status); break;
case Operation::CLC: Primitive::clc(status); return;
case Operation::CLD: Primitive::cld(status); return;

56
OSBindings/Mac/Clock SignalTests/8088Tests.mm
View File

@ -265,7 +265,8 @@ struct ExecutionSupport {
};
struct FailedExecution {
std::string file, test_name;
std::string test_name;
std::string reason;
InstructionSet::x86::Instruction<false> instruction;
};
@ -417,7 +418,6 @@ struct FailedExecution {
@"90.json.gz",
// TODO: POP, POPF, PUSH, PUSHF
// TODO: SAL, SAR, SHR
// RCL
@"D0.2.json.gz", @"D2.2.json.gz",
@ -441,8 +441,12 @@ struct FailedExecution {
// @"D1.4.json.gz", @"D3.4.json.gz",
// SAR
@"D0.7.json.gz", @"D2.7.json.gz",
@"D1.7.json.gz", @"D3.7.json.gz",
// @"D0.7.json.gz", @"D2.7.json.gz",
// @"D1.7.json.gz", @"D3.7.json.gz",
// SHR
@"D0.5.json.gz", @"D2.5.json.gz",
@"D1.5.json.gz", @"D3.5.json.gz",
/*
@"F8.json.gz", // CLC
@ -694,36 +698,24 @@ struct FailedExecution {
if(!statusEqual || !registersEqual || !ramEqual) {
FailedExecution failure;
failure.instruction = decoded.second;
// failure.file = // TODO
failure.test_name = std::string([test[@"name"] UTF8String]);
NSMutableArray<NSString *> *reasons = [[NSMutableArray alloc] init];
if(!statusEqual) {
[reasons addObject:
[NSString stringWithFormat:@"status differs by %04x",
(intended_status.get() ^ execution_support.status.get()) & flags_mask]];
}
if(!registersEqual) {
[reasons addObject:@"registers don't match"];
}
if(!ramEqual) {
[reasons addObject:@"RAM contents don't match"];
}
failure.reason = std::string([reasons componentsJoinedByString:@"; "].UTF8String);
execution_failures.push_back(std::move(failure));
}
/* if(assert) {
XCTAssert(
statusEqual,
"Status doesn't match despite mask %04x — differs in %04x after %@; executing %@",
flags_mask,
(intended_status.get() ^ execution_support.status.get()) & flags_mask,
test[@"name"],
[self toString:decoded.second offsetLength:4 immediateLength:4]
);
// TODO: should probably say more about the following two.
XCTAssert(
registersEqual,
"Register mismatch after %@; executing %@",
test[@"name"],
[self toString:decoded.second offsetLength:4 immediateLength:4]
);
XCTAssert(
ramEqual,
"Memory contents mismatch after %@; executing %@",
test[@"name"],
[self toString:decoded.second offsetLength:4 immediateLength:4]
);
}
return statusEqual && registersEqual && ramEqual;*/
}
- (void)printFailures:(NSArray<NSString *> *)failures {
@ -775,7 +767,7 @@ struct FailedExecution {
XCTAssertEqual(execution_failures.size(), 0);
for(const auto &failure: execution_failures) {
NSLog(@"Failed %s", failure.test_name.c_str());
NSLog(@"Failed %s — %s", failure.test_name.c_str(), failure.reason.c_str());
}
}