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load register only if needed

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- do thumb bl long merge in the first step
- preparations for better branch jitting
This commit is contained in:
RSDuck
2019-09-08 14:48:20 +02:00
parent 2ef776883f
commit 5338c28f40
7 changed files with 48 additions and 32 deletions
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16
src/ARMJIT.cpp
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@ -159,6 +159,7 @@ CompiledBlock CompileBlock(ARM* cpu)
u32 r15 = cpu->R[15];
cpu->FillPipeline();
u32 nextInstr[2] = {cpu->NextInstr[0], cpu->NextInstr[1]};
u32 nextInstrAddr[2] = {blockAddr, r15};
do
{
r15 += thumb ? 2 : 4;
@ -166,6 +167,10 @@ CompiledBlock CompileBlock(ARM* cpu)
instrs[i].SetFlags = 0;
instrs[i].Instr = nextInstr[0];
instrs[i].NextInstr[0] = nextInstr[0] = nextInstr[1];
instrs[i].Addr = nextInstrAddr[0];
nextInstrAddr[0] = nextInstrAddr[1];
nextInstrAddr[1] = r15;
if (cpu->Num == 0)
{
@ -193,8 +198,19 @@ CompiledBlock CompileBlock(ARM* cpu)
instrs[i].NextInstr[1] = nextInstr[1];
instrs[i].Info = ARMInstrInfo::Decode(thumb, cpu->Num, instrs[i].Instr);
if (thumb && instrs[i].Info.Kind == ARMInstrInfo::tk_BL_LONG_2 && i > 0
&& instrs[i - 1].Info.Kind == ARMInstrInfo::tk_BL_LONG_1)
{
instrs[i - 1].Info.Kind = ARMInstrInfo::tk_BL_LONG;
instrs[i - 1].Instr = (instrs[i - 1].Instr & 0xFFFF) | (instrs[i].Instr << 16);
instrs[i - 1].Info.DstRegs = 0xC000;
instrs[i - 1].Info.SrcRegs = 0;
instrs[i - 1].Info.EndBlock = true;
i--;
}
i++;
bool canCompile = compiler->CanCompile(thumb, instrs[i - 1].Info.Kind);
if (instrs[i - 1].Info.ReadFlags != 0 || !canCompile)
floodFillSetFlags(instrs, i - 2, canCompile ? instrs[i - 1].Info.ReadFlags : 0xF);