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Use GPFIFO pushbuffer contents in-place if possible

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The memcpy within `Read()` was taking up a fair amount of time, avoid this by using the mapped range in-place when the mapping isn't split.
This commit is contained in:
Billy Laws 2022-08-31 13:00:15 +01:00
parent be825b7aad
commit 30ec844a1b
1 changed files with 17 additions and 8 deletions
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25
app/src/main/cpp/skyline/soc/gm20b/gpfifo.cpp
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@ -165,17 +165,26 @@ namespace skyline::soc::gm20b {
}
}
pushBufferData.resize(gpEntry.size);
channelCtx.asCtx->gmmu.Read<u32>(pushBufferData, gpEntry.Address());
auto pushBufferMappedRanges{channelCtx.asCtx->gmmu.TranslateRange(gpEntry.Address(), gpEntry.size * sizeof(u32))};
auto pushBuffer{[&]() -> span<u32> {
if (pushBufferMappedRanges.size() == 1) {
return pushBufferMappedRanges.front().cast<u32>();
} else {
// Create an intermediate copy of pushbuffer data if it's split across multiple mappings
pushBufferData.resize(gpEntry.size);
channelCtx.asCtx->gmmu.Read<u32>(pushBufferData, gpEntry.Address());
return span(pushBufferData);
}
}()};
// There will be at least one entry here
auto entry{pushBufferData.begin()};
auto entry{pushBuffer.begin()};
// Executes the current split method, returning once execution is finished or the current GpEntry has reached its end
auto resumeSplitMethod{[&](){
switch (resumeState.state) {
case MethodResumeState::State::Inc:
while (entry != pushBufferData.end() && resumeState.remaining)
while (entry != pushBuffer.end() && resumeState.remaining)
SendFull(resumeState.address++, *(entry++), resumeState.subChannel, --resumeState.remaining == 0);
break;
@ -186,7 +195,7 @@ namespace skyline::soc::gm20b {
resumeState.state = MethodResumeState::State::NonInc;
[[fallthrough]];
case MethodResumeState::State::NonInc:
while (entry != pushBufferData.end() && resumeState.remaining)
while (entry != pushBuffer.end() && resumeState.remaining)
SendFull(resumeState.address, *(entry++), resumeState.subChannel, --resumeState.remaining == 0);
break;
@ -198,8 +207,8 @@ namespace skyline::soc::gm20b {
resumeSplitMethod();
// Process more methods if the entries are still not all used up after handling resuming
for (; entry != pushBufferData.end(); entry++) {
if (entry >= pushBufferData.end())
for (; entry != pushBuffer.end(); entry++) {
if (entry >= pushBuffer.end())
throw exception("GPFIFO buffer overflow!"); // This should never happen
// An entry containing all zeroes is a NOP, skip over it
@ -209,7 +218,7 @@ namespace skyline::soc::gm20b {
PushBufferMethodHeader methodHeader{.raw = *entry};
// Needed in order to check for methods split across multiple GpEntries
ssize_t remainingEntries{std::distance(entry, pushBufferData.end()) - 1};
ssize_t remainingEntries{std::distance(entry, pushBuffer.end()) - 1};
// Handles storing state and initial execution for methods that are split across multiple GpEntries
auto startSplitMethod{[&](auto methodState) {