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a32_emit_x64: BMI2 implementation of A32SetCpsr

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This commit is contained in:
MerryMage 2018-07-27 11:41:31 +01:00
parent 0f85305933
commit 5dc23e49d7
1 changed files with 34 additions and 3 deletions
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31
src/backend_x64/a32_emit_x64.cpp
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@ -311,9 +311,40 @@ static void SetCpsrImpl(u32 value, A32JitState* jit_state) {
void A32EmitX64::EmitA32SetCpsr(A32EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
if (code.DoesCpuSupport(Xbyak::util::Cpu::tBMI2)) {
Xbyak::Reg32 cpsr = ctx.reg_alloc.UseScratchGpr(args[0]).cvt32();
Xbyak::Reg32 tmp = ctx.reg_alloc.ScratchGpr().cvt32();
// CPSR_q
code.bt(cpsr, 27);
code.setc(code.byte[r15 + offsetof(A32JitState, CPSR_q)]);
// CPSR_nzcv
code.mov(tmp, cpsr);
code.and_(tmp, 0xF0000000);
code.mov(dword[r15 + offsetof(A32JitState, CPSR_nzcv)], tmp);
// CPSR_jaifm
code.mov(tmp, cpsr);
code.and_(tmp, 0x07F0FDDF);
code.mov(dword[r15 + offsetof(A32JitState, CPSR_jaifm)], tmp);
// CPSR_et and CPSR_ge
static_assert(offsetof(A32JitState, CPSR_et) + 4 == offsetof(A32JitState, CPSR_ge));
code.mov(tmp, 0x000f0220);
code.pext(cpsr, cpsr, tmp);
code.mov(tmp.cvt64(), 0x8080808000000003ull);
code.pdep(cpsr.cvt64(), cpsr.cvt64(), tmp.cvt64());
code.mov(tmp.cvt64(), cpsr.cvt64());
code.shr(tmp.cvt64(), 7);
code.sub(cpsr.cvt64(), tmp.cvt64());
code.mov(qword[r15 + offsetof(A32JitState, CPSR_et)], cpsr.cvt64());
} else {
ctx.reg_alloc.HostCall(nullptr, args[0]);
code.mov(code.ABI_PARAM2, code.r15);
code.CallFunction(&SetCpsrImpl);
}
}
void A32EmitX64::EmitA32SetCpsrNZCV(A32EmitContext& ctx, IR::Inst* inst) {