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armjit: Try to find imms to optimize a reg load.

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This way we skip the MOVW/MOVT and go for one op only.
This commit is contained in:
Unknown W. Brackets 2013-11-10 16:20:34 -08:00
parent 7e46ee0b0f
commit c63560c0dd
1 changed files with 29 additions and 0 deletions
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29
Core/MIPS/ARM/ArmRegCache.cpp
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@ -101,6 +101,35 @@ bool ArmRegCache::IsMappedAsPointer(MIPSGPReg mipsReg) {
}
void ArmRegCache::SetRegImm(ARMReg reg, u32 imm) {
// If we can do it with a simple Operand2, let's do that.
Operand2 op2;
bool inverse;
if (TryMakeOperand2_AllowInverse(imm, op2, &inverse)) {
if (!inverse)
emit_->MOV(reg, op2);
else
emit_->MVN(reg, op2);
return;
}
// Okay, so it's a bit more complex. Let's see if we have any useful regs with imm values.
for (int i = 0; i < NUM_MIPSREG; i++) {
const auto &mreg = mr[i];
if (mreg.loc != ML_ARMREG_IMM)
continue;
if (mreg.imm - imm < 256) {
emit_->SUB(reg, mreg.reg, mreg.imm - imm);
return;
}
if (imm - mreg.imm < 256) {
emit_->ADD(reg, mreg.reg, imm - mreg.imm);
return;
}
// TODO: All sorts of things are possible here, shifted adds, ands/ors, etc.
}
// No luck. Let's go with a regular load.
emit_->MOVI2R(reg, imm);
}