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subfmex/subfzex.

This commit is contained in:
Ben Vanik 2013-10-19 18:33:32 -07:00
parent b8edeba195
commit 14b1c860b9
1 changed files with 78 additions and 4 deletions
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82
src/xenia/cpu/x64/x64_emit_alu.cc
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@ -687,13 +687,87 @@ XEEMITTER(subfex, 0x7C000110, XO )(X64Emitter& e, X86Compiler& c, InstrDat
}
XEEMITTER(subfmex, 0x7C0001D0, XO )(X64Emitter& e, X86Compiler& c, InstrData& i) {
XEINSTRNOTIMPLEMENTED();
return 1;
// RT <- ¬(RA) + CA - 1
GpVar v(c.newGpVar());
c.mov(v, e.gpr_value(i.XO.RA));
c.not_(v);
// 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));
Label post_stc_label = c.newLabel();
c.jz(post_stc_label, kCondHintLikely);
c.stc();
c.bind(post_stc_label);
c.adc(v, imm(-1));
GpVar cc(c.newGpVar());
c.setc(cc.r8());
e.update_gpr_value(i.XO.RT, v);
if (i.XO.OE) {
// With XER update.
XEASSERTALWAYS();
//e.update_xer_with_overflow_and_carry(b.CreateExtractValue(v, 1));
} else {
e.update_xer_with_carry(cc);
}
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(subfzex, 0x7C000190, XO )(X64Emitter& e, X86Compiler& c, InstrData& i) {
XEINSTRNOTIMPLEMENTED();
return 1;
// RT <- ¬(RA) + CA
GpVar v(c.newGpVar());
c.mov(v, e.gpr_value(i.XO.RA));
c.not_(v);
// 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));
Label post_stc_label = c.newLabel();
c.jz(post_stc_label, kCondHintLikely);
c.stc();
c.bind(post_stc_label);
c.adc(v, imm(0));
GpVar cc(c.newGpVar());
c.setc(cc.r8());
e.update_gpr_value(i.XO.RT, v);
if (i.XO.OE) {
// With XER update.
XEASSERTALWAYS();
//e.update_xer_with_overflow_and_carry(b.CreateExtractValue(v, 1));
} else {
e.update_xer_with_carry(cc);
}
if (i.XO.Rc) {
// With cr0 update.
e.update_cr_with_cond(0, v);
}
e.clear_constant_gpr_value(i.XO.RT);
return 0;
}