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If MOVI2R can be done in 2 ops for ARMv6, prefer that over litpool. Litpool can take 1-3 cycles depending on when the value is used. So, usually 3 cycles :\.

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This commit is contained in:
Sacha 2013-03-28 21:26:13 +10:00
parent 72a73b5965
commit 2f63b56c19
2 changed files with 29 additions and 1 deletions
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29
Common/ArmEmitter.cpp
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@ -90,6 +90,33 @@ Operand2 AssumeMakeOperand2(u32 imm) {
return op2;
}
bool ARMXEmitter::TrySetValue_TwoOp(ARMReg reg, u32 val)
{
int ops = 0;
for (int i = 0; i < 16; i++)
{
if ((val >> (i*2)) & 0x3)
{
ops++;
i+=3;
}
}
if (ops > 2)
return false;
bool first = true;
for (int i = 0; i < 16; i++, val >>=2) {
if (val & 0x3) {
first ? MOV(reg, Operand2((u8)val, (u8)((16-i) & 0xF)))
: ORR(reg, reg, Operand2((u8)val, (u8)((16-i) & 0xF)));
first = false;
i+=3;
val >>= 6;
}
}
return true;
}
void ARMXEmitter::MOVI2F(ARMReg dest, float val, ARMReg tempReg)
{
union {float f; u32 u;} conv;
@ -210,7 +237,7 @@ void ARMXEmitter::MOVI2R(ARMReg reg, u32 val, bool optimize)
MOVW(reg, val & 0xFFFF);
if(val & 0xFFFF0000)
MOVT(reg, val, true);
} else {
} else if (!TrySetValue_TwoOp(reg,val) {
// Use literal pool for ARMv6.
AddNewLit(val);
LDR(reg, _PC); // To be backpatched later

1
Common/ArmEmitter.h
View File

@ -393,6 +393,7 @@ public:
void FlushLitPool();
void AddNewLit(u32 val);
bool TrySetValue_TwoOp(ARMReg reg, u32 val);
CCFlags GetCC() { return CCFlags(condition >> 28); }
void SetCC(CCFlags cond = CC_AL);