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[JIT] Don't bother using a temp for constant addresses < 0x80000000

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This commit is contained in:
DrChat 2018-02-13 12:50:33 -06:00
parent 190108dab6
commit e2bbae3896
1 changed files with 7 additions and 2 deletions
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9
src/xenia/cpu/backend/x64/x64_sequences.cc
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@ -2139,8 +2139,13 @@ RegExp ComputeMemoryAddress(X64Emitter& e, const T& guest) {
// TODO(benvanik): figure out how to do this without a temp. // TODO(benvanik): figure out how to do this without a temp.
// Since the constant is often 0x8... if we tried to use that as a // Since the constant is often 0x8... if we tried to use that as a
// displacement it would be sign extended and mess things up. // displacement it would be sign extended and mess things up.
e.mov(e.eax, static_cast<uint32_t>(guest.constant())); uint32_t address = static_cast<uint32_t>(guest.constant());
return e.GetMembaseReg() + e.rax; if (address < 0x80000000) {
return e.GetMembaseReg() + address;
} else {
e.mov(e.eax, address);
return e.GetMembaseReg() + e.rax;
}
} else { } else {
// Clear the top 32 bits, as they are likely garbage. // Clear the top 32 bits, as they are likely garbage.
// TODO(benvanik): find a way to avoid doing this. // TODO(benvanik): find a way to avoid doing this.