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authorbunnei <bunneidev@gmail.com>2018-11-21 20:32:21 +0100
committerbunnei <bunneidev@gmail.com>2018-11-22 06:58:00 +0100
commit033b46253e6c7de33c5f8b51adb9d96ca606669d (patch)
treeaf5ad3a30c91e3e769e55eb542f8455bed694ccf /src
parentMerge pull request #1754 from ReinUsesLisp/zero-register (diff)
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Diffstat (limited to 'src')
-rw-r--r--src/video_core/macro_interpreter.cpp29
-rw-r--r--src/video_core/macro_interpreter.h4
2 files changed, 25 insertions, 8 deletions
diff --git a/src/video_core/macro_interpreter.cpp b/src/video_core/macro_interpreter.cpp
index 335a8d407..2b0dea5cd 100644
--- a/src/video_core/macro_interpreter.cpp
+++ b/src/video_core/macro_interpreter.cpp
@@ -35,6 +35,7 @@ void MacroInterpreter::Reset() {
// The next parameter index starts at 1, because $r1 already has the value of the first
// parameter.
next_parameter_index = 1;
+ carry_flag = false;
}
bool MacroInterpreter::Step(u32 offset, bool is_delay_slot) {
@@ -135,14 +136,28 @@ MacroInterpreter::Opcode MacroInterpreter::GetOpcode(u32 offset) const {
return {macro_memory[offset + pc / sizeof(u32)]};
}
-u32 MacroInterpreter::GetALUResult(ALUOperation operation, u32 src_a, u32 src_b) const {
+u32 MacroInterpreter::GetALUResult(ALUOperation operation, u32 src_a, u32 src_b) {
switch (operation) {
- case ALUOperation::Add:
- return src_a + src_b;
- // TODO(Subv): Implement AddWithCarry
- case ALUOperation::Subtract:
- return src_a - src_b;
- // TODO(Subv): Implement SubtractWithBorrow
+ case ALUOperation::Add: {
+ const u64 result{static_cast<u64>(src_a) + src_b};
+ carry_flag = result > 0xffffffff;
+ return static_cast<u32>(result);
+ }
+ case ALUOperation::AddWithCarry: {
+ const u64 result{static_cast<u64>(src_a) + src_b + (carry_flag ? 1ULL : 0ULL)};
+ carry_flag = result > 0xffffffff;
+ return static_cast<u32>(result);
+ }
+ case ALUOperation::Subtract: {
+ const u64 result{static_cast<u64>(src_a) - src_b};
+ carry_flag = result < 0x100000000;
+ return static_cast<u32>(result);
+ }
+ case ALUOperation::SubtractWithBorrow: {
+ const u64 result{static_cast<u64>(src_a) - src_b - (carry_flag ? 0ULL : 1ULL)};
+ carry_flag = result < 0x100000000;
+ return static_cast<u32>(result);
+ }
case ALUOperation::Xor:
return src_a ^ src_b;
case ALUOperation::Or:
diff --git a/src/video_core/macro_interpreter.h b/src/video_core/macro_interpreter.h
index 62d1ce289..cde360288 100644
--- a/src/video_core/macro_interpreter.h
+++ b/src/video_core/macro_interpreter.h
@@ -117,7 +117,7 @@ private:
bool Step(u32 offset, bool is_delay_slot);
/// Calculates the result of an ALU operation. src_a OP src_b;
- u32 GetALUResult(ALUOperation operation, u32 src_a, u32 src_b) const;
+ u32 GetALUResult(ALUOperation operation, u32 src_a, u32 src_b);
/// Performs the result operation on the input result and stores it in the specified register
/// (if necessary).
@@ -165,5 +165,7 @@ private:
std::vector<u32> parameters;
/// Index of the next parameter that will be fetched by the 'parm' instruction.
u32 next_parameter_index = 0;
+
+ bool carry_flag{};
};
} // namespace Tegra