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addmex

This commit is contained in:
Ben Vanik 2013-10-19 20:57:24 -07:00
parent 5b91ba89e9
commit d60cf676c3
1 changed files with 34 additions and 2 deletions
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36
src/xenia/cpu/x64/x64_emit_alu.cc
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@ -211,8 +211,40 @@ XEEMITTER(addis, 0x3C000000, D )(X64Emitter& e, X86Compiler& c, InstrDat
}
XEEMITTER(addmex, 0x7C0001D4, XO )(X64Emitter& e, X86Compiler& c, InstrData& i) {
XEINSTRNOTIMPLEMENTED();
return 1;
// RT <- (RA) + CA - 1
// Add in carry flag from XER, only if needed.
// It may be possible to do this much more efficiently.
GpVar xer(c.newGpVar());
c.mov(xer, e.xer_value());
c.shr(xer, imm(29));
c.and_(xer, imm(1));
c.sub(xer, imm(1));
GpVar v(c.newGpVar());
c.mov(v, e.gpr_value(i.XO.RA));
c.add(v, xer);
GpVar cc(c.newGpVar());
c.setc(cc.r8());
e.update_gpr_value(i.XO.RT, v);
e.update_xer_with_carry(cc);
if (i.XO.OE) {
// With XER[SO] update too.
//e.update_xer_with_overflow_and_carry(b.CreateExtractValue(v, 1));
} else {
// Just CA update.
//e.update_xer_with_carry(b.CreateExtractValue(v, 1));
}
if (i.XO.Rc) {
// With cr0 update.
e.update_cr_with_cond(0, v);
}
e.clear_constant_gpr_value(i.XO.RT);
return 0;
}
XEEMITTER(addzex, 0x7C000194, XO )(X64Emitter& e, X86Compiler& c, InstrData& i) {