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place locals on backend pages

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This commit is contained in:
disjtqz
2023-10-01 09:14:41 -04:00
committed by Radosław Gliński
parent 67f16c4e31
commit fe7dc26e3f
3 changed files with 42 additions and 18 deletions
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24
src/xenia/cpu/backend/x64/x64_emitter.cc
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@@ -208,7 +208,26 @@ bool X64Emitter::Emit(HIRBuilder* builder, EmitFunctionInfo& func_info) {
// IMPORTANT: any changes to the prolog must be kept in sync with
// X64CodeCache, which dynamically generates exception information.
// Adding or changing anything here must be matched!
const size_t stack_size = StackLayout::GUEST_STACK_SIZE + stack_offset;
/*
pick a page to use as the local base as close to the commonly accessed page that contains most backend fields
the sizes that are checked are chosen based on PTE coalescing sizes. zen does 16k or 32k
*/
size_t stack_size = StackLayout::GUEST_STACK_SIZE;
if (stack_offset < (4096 - sizeof(X64BackendContext))) {
locals_page_delta_ = 4096;
} else if (stack_offset < (16384 - sizeof(X64BackendContext))) {//16k PTE coalescing
locals_page_delta_ = 16384;
} else if (stack_offset < (32768 - sizeof(X64BackendContext))) {
locals_page_delta_ = 32768;
} else if (stack_offset < (65536 - sizeof(X64BackendContext))) {
locals_page_delta_ = 65536;
} else {
//extremely unlikely, fall back to stack
stack_size = xe::align<size_t>(StackLayout::GUEST_STACK_SIZE + stack_offset, 16);
locals_page_delta_ = 0;
}
assert_true((stack_size + 8) % 16 == 0);
func_info.stack_size = stack_size;
stack_size_ = stack_size;
@@ -1591,6 +1610,9 @@ SimdDomain X64Emitter::DeduceSimdDomain(const hir::Value* for_value) {
return SimdDomain::DONTCARE;
}
Xbyak::RegExp X64Emitter::GetLocalsBase() const {
return !locals_page_delta_ ? rsp : GetContextReg() - locals_page_delta_;
}
Xbyak::Address X64Emitter::GetBackendCtxPtr(int offset_in_x64backendctx) const {
/*
index context ptr negatively to get to backend ctx field