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Custom stack for IVM. 2-3x faster.

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This commit is contained in:
Ben Vanik
2014-01-06 23:11:10 -08:00
parent 2ed6f478c1
commit 698eaeeb88
6 changed files with 155 additions and 9 deletions
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12
src/alloy/backend/ivm/ivm_function.cc
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@@ -9,6 +9,7 @@
#include <alloy/backend/ivm/ivm_function.h>
#include <alloy/backend/ivm/ivm_stack.h>
#include <alloy/backend/tracing.h>
#include <alloy/runtime/runtime.h>
#include <alloy/runtime/thread_state.h>
@@ -103,11 +104,8 @@ void IVMFunction::OnBreakpointHit(ThreadState* thread_state, IntCode* i) {
int IVMFunction::CallImpl(ThreadState* thread_state, uint64_t return_address) {
// Setup register file on stack.
const size_t max_stack_alloc = 16 * 1024;
size_t register_file_size = register_count_ * sizeof(Register);
Register* register_file = (Register*)(
register_file_size >= max_stack_alloc ?
xe_malloc(register_file_size) : alloca(register_file_size));
auto stack = (IVMStack*)thread_state->backend_data();
auto register_file = (Register*)stack->Alloc(register_count_);
Memory* memory = thread_state->memory();
@@ -151,9 +149,7 @@ int IVMFunction::CallImpl(ThreadState* thread_state, uint64_t return_address) {
}
}
if (register_file_size >= max_stack_alloc) {
xe_free(register_file);
}
stack->Free(register_count_);
return 0;
}