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Optimizing memory accesses a bit by letting libjit use relative addressing.

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This commit is contained in:
Ben Vanik 2013-05-23 11:46:26 -07:00
parent fc8eb3d40a
commit 89672e111d
2 changed files with 15 additions and 12 deletions
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25
src/xenia/cpu/libjit/libjit_emitter.cc
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@ -1275,7 +1275,7 @@ void LibjitEmitter::update_fpr_value(uint32_t n, jit_value_t value) {
jit_insn_store(fn_, locals_.fpr[n], value);
}
jit_value_t LibjitEmitter::GetMemoryAddress(uint32_t cia, jit_value_t addr) {
jit_value_t LibjitEmitter::TouchMemoryAddress(uint32_t cia, jit_value_t addr) {
// Input address is always in 32-bit space.
// TODO(benvanik): is this required? It's one extra instruction on every
// access...
@ -1303,11 +1303,7 @@ jit_value_t LibjitEmitter::GetMemoryAddress(uint32_t cia, jit_value_t addr) {
// b.SetInsertPoint(valid_bb);
// }
// Rebase off of memory base pointer.
// We could store the memory base as a global value (or indirection off of
// state) if we wanted to avoid embedding runtime values into the code.
jit_value_t membase = get_uint64((uint64_t)xe_memory_addr(memory_, 0));
return jit_insn_add(fn_, addr, membase);
return addr;
}
jit_value_t LibjitEmitter::ReadMemory(
@ -1335,8 +1331,12 @@ jit_value_t LibjitEmitter::ReadMemory(
return NULL;
}
jit_value_t address = GetMemoryAddress(cia, addr);
jit_value_t value = jit_insn_load_relative(fn_, address, 0, data_type);
// Rebase off of memory base pointer.
// We could store the memory base as a global value (or indirection off of
// state) if we wanted to avoid embedding runtime values into the code.
jit_value_t address = TouchMemoryAddress(cia, addr);
jit_nint membase = (jit_nint)xe_memory_addr(memory_, 0);
jit_value_t value = jit_insn_load_relative(fn_, address, membase, data_type);
if (acquire) {
// TODO(benvanik): acquire semantics.
// load_value->setAlignment(size);
@ -1380,8 +1380,6 @@ void LibjitEmitter::WriteMemory(
return;
}
jit_value_t address = GetMemoryAddress(cia, addr);
// Truncate, if required.
if (jit_value_get_type(value) != data_type) {
value = jit_insn_convert(fn_, value, data_type, 0);
@ -1400,5 +1398,10 @@ void LibjitEmitter::WriteMemory(
// store_value->setAtomic(Release);
// }
jit_insn_store_relative(fn_, address, 0, value);
// Rebase off of memory base pointer.
// We could store the memory base as a global value (or indirection off of
// state) if we wanted to avoid embedding runtime values into the code.
jit_value_t address = TouchMemoryAddress(cia, addr);
jit_nint membase = (jit_nint)xe_memory_addr(memory_, 0);
jit_insn_store_relative(fn_, address, membase, value);
}

2
src/xenia/cpu/libjit/libjit_emitter.h
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@ -92,7 +92,7 @@ public:
jit_value_t fpr_value(uint32_t n);
void update_fpr_value(uint32_t n, jit_value_t value);
jit_value_t GetMemoryAddress(uint32_t cia, jit_value_t addr);
jit_value_t TouchMemoryAddress(uint32_t cia, jit_value_t addr);
jit_value_t ReadMemory(
uint32_t cia, jit_value_t addr, uint32_t size, bool acquire = false);
void WriteMemory(