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cntlzd and fixing broken cntlzwx.

This commit is contained in:
Ben Vanik 2013-05-26 16:30:43 -07:00
parent 86396816f5
commit 924b08b264
1 changed files with 21 additions and 4 deletions
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25
src/xenia/cpu/x64/x64_emit_alu.cc
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@ -679,19 +679,36 @@ XEEMITTER(andisx, 0x74000000, D )(X64Emitter& e, X86Compiler& c, InstrDat
}
XEEMITTER(cntlzdx, 0x7C000074, X )(X64Emitter& e, X86Compiler& c, InstrData& i) {
XEINSTRNOTIMPLEMENTED();
return 1;
// n <- 0
// do while n < 64
// if (RS)[n] = 1 then leave n
// n <- n + 1
// RA <- n
GpVar v(c.newGpVar());
c.mov(v, e.gpr_value(i.X.RT));
c.bsr(v, v);
c.cmovz(v, e.get_uint64(63));
c.xor_(v, imm(0x3F));
e.update_gpr_value(i.X.RA, v);
if (i.X.Rc) {
// With cr0 update.
e.update_cr_with_cond(0, v);
}
return 0;
}
XEEMITTER(cntlzwx, 0x7C000034, X )(X64Emitter& e, X86Compiler& c, InstrData& i) {
// n <- 32
// do while n < 64
// if (RS) = 1 then leave n
// if (RS)[n] = 1 then leave n
// n <- n + 1
// RA <- n - 32
GpVar v(c.newGpVar());
c.mov(v, imm(0xF0000000));
c.mov(v, e.gpr_value(i.X.RT));
c.bsr(v.r32(), v.r32());
c.cmovz(v, e.get_uint64(63));
c.xor_(v, imm(0x1F));