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Resolves assumption that shifts greater than the bit count of the relevant int are well-defined in C.

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This commit is contained in:
Thomas Harte 2019-06-24 16:51:43 -04:00
parent 3ec9a1d869
commit c447655047
2 changed files with 102 additions and 6 deletions
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92
OSBindings/Mac/Clock SignalTests/68000Tests.mm
View File

@ -1644,6 +1644,98 @@ class CPU::MC68000::ProcessorStorageTests {
XCTAssertEqual(16, _machine->get_cycle_count()); XCTAssertEqual(16, _machine->get_cycle_count());
} }
// MARK: LSL
- (void)testLSLb_Dn_2 {
_machine->set_program({
0xe529 // LSL.b D2, D1
});
auto state = _machine->get_processor_state();
state.data[1] = 0xce3dd567;
state.data[2] = 2;
_machine->set_processor_state(state);
_machine->run_for_instructions(1);
state = _machine->get_processor_state();
XCTAssertEqual(state.data[1], 0xce3dd59c);
XCTAssertEqual(state.data[2], 2);
XCTAssertEqual(state.status & Flag::ConditionCodes, Flag::Extend | Flag::Negative | Flag::Carry);
XCTAssertEqual(10, _machine->get_cycle_count());
}
- (void)testLSLb_Dn_69 {
_machine->set_program({
0xe529 // LSL.b D2, D1
});
auto state = _machine->get_processor_state();
state.data[1] = 0xce3dd567;
state.data[2] = 0x69;
_machine->set_processor_state(state);
_machine->run_for_instructions(1);
state = _machine->get_processor_state();
XCTAssertEqual(state.data[1], 0xce3dd500);
XCTAssertEqual(state.data[2], 0x69);
XCTAssertEqual(state.status & Flag::ConditionCodes, Flag::Zero);
XCTAssertEqual(88, _machine->get_cycle_count());
}
- (void)testLSLw_Dn_0 {
_machine->set_program({
0xe569 // LSL.w D2, D1
});
auto state = _machine->get_processor_state();
state.data[1] = 0xce3dd567;
state.data[2] = 0;
_machine->set_processor_state(state);
_machine->run_for_instructions(1);
state = _machine->get_processor_state();
XCTAssertEqual(state.data[1], 0xce3dd567);
XCTAssertEqual(state.data[2], 0);
XCTAssertEqual(state.status & Flag::ConditionCodes, Flag::Negative);
XCTAssertEqual(6, _machine->get_cycle_count());
}
- (void)testLSLw_Dn_b {
_machine->set_program({
0xe569 // LSL.w D2, D1
});
auto state = _machine->get_processor_state();
state.data[1] = 0xce3dd567;
state.data[2] = 0xb;
_machine->set_processor_state(state);
_machine->run_for_instructions(1);
state = _machine->get_processor_state();
XCTAssertEqual(state.data[1], 0xce3d3800);
XCTAssertEqual(state.data[2], 0xb);
XCTAssertEqual(state.status & Flag::ConditionCodes, Flag::Extend | Flag::Carry);
XCTAssertEqual(28, _machine->get_cycle_count());
}
- (void)testLSLl_Dn {
_machine->set_program({
0xe5a9 // LSL.l D2, D1
});
auto state = _machine->get_processor_state();
state.data[1] = 0xce3dd567;
state.data[2] = 0x20;
_machine->set_processor_state(state);
_machine->run_for_instructions(1);
state = _machine->get_processor_state();
XCTAssertEqual(state.data[1], 0);
XCTAssertEqual(state.data[2], 0x20);
XCTAssertEqual(state.status & Flag::ConditionCodes, Flag::Extend | Flag::Carry | Flag::Zero);
XCTAssertEqual(72, _machine->get_cycle_count());
}
// MARK: MOVEM // MARK: MOVEM
- (void)testMOVEM { - (void)testMOVEM {

16
Processors/68000/Implementation/68000Implementation.hpp
View File

@ -1557,7 +1557,7 @@ template <class T, bool dtack_is_implicit, bool signal_will_perform> void Proces
if(!shift_count) { \ if(!shift_count) { \
carry_flag_ = 0; \ carry_flag_ = 0; \
} else { \ } else { \
destination = decltype(destination)(value << shift_count); \ destination = (shift_count < size) ? decltype(destination)(value << shift_count) : 0; \
extend_flag_ = carry_flag_ = decltype(carry_flag_)(value) & decltype(carry_flag_)( (1 << (size - 1)) >> (shift_count - 1) ); \ extend_flag_ = carry_flag_ = decltype(carry_flag_)(value) & decltype(carry_flag_)( (1 << (size - 1)) >> (shift_count - 1) ); \
} \ } \
\ \
@ -1583,10 +1583,14 @@ template <class T, bool dtack_is_implicit, bool signal_will_perform> void Proces
if(!shift_count) { \ if(!shift_count) { \
carry_flag_ = 0; \ carry_flag_ = 0; \
} else { \ } else { \
destination = decltype(destination)(\ destination = (shift_count < size) ? \
(value >> shift_count) | \ decltype(destination)(\
((value & decltype(value)(1 << (size - 1)) ? 0xffffffff : 0x000000000) << (size - shift_count)) \ (value >> shift_count) | \
); \ ((value & decltype(value)(1 << (size - 1)) ? 0xffffffff : 0x000000000) << (size - shift_count)) \
) : \
decltype(destination)( \
(value & decltype(value)(1 << (size - 1))) ? 0xffffffff : 0x000000000 \
); \
extend_flag_ = carry_flag_ = decltype(carry_flag_)(value) & decltype(carry_flag_)(1 << (shift_count - 1)); \ extend_flag_ = carry_flag_ = decltype(carry_flag_)(value) & decltype(carry_flag_)(1 << (shift_count - 1)); \
} \ } \
\ \
@ -1634,7 +1638,7 @@ template <class T, bool dtack_is_implicit, bool signal_will_perform> void Proces
if(!shift_count) { \ if(!shift_count) { \
carry_flag_ = 0; \ carry_flag_ = 0; \
} else { \ } else { \
destination = value >> shift_count; \ destination = (shift_count < size) ? (value >> shift_count) : 0; \
extend_flag_ = carry_flag_ = value & decltype(carry_flag_)(1 << (shift_count - 1)); \ extend_flag_ = carry_flag_ = value & decltype(carry_flag_)(1 << (shift_count - 1)); \
} \ } \
\ \