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srawix.

This commit is contained in:
Ben Vanik 2013-05-25 01:50:46 -07:00
parent 8207bb8088
commit e29de199ff
1 changed files with 20 additions and 13 deletions
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33
src/xenia/cpu/x64/x64_emit_alu.cc
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@ -1006,7 +1006,6 @@ XEEMITTER(srawx, 0x7C000630, X )(X64Emitter& e, X86Compiler& c, InstrDat
return 1;
}
#if 0
XEEMITTER(srawix, 0x7C000670, X )(X64Emitter& e, X86Compiler& c, InstrData& i) {
// n <- SH
// r <- ROTL32((RS)[32:63], 64-n)
@ -1015,24 +1014,33 @@ XEEMITTER(srawix, 0x7C000670, X )(X64Emitter& e, X86Compiler& c, InstrDat
// RA <- r&m | (i64.s)&¬m
// CA <- s & ((r&¬m)[32:63]≠0)
jit_value_t rs64 = e.gpr_value(i.X.RT);
jit_value_t rs32 = e.trunc_to_int(rs64);
GpVar v(c.newGpVar());
c.mov(v, e.gpr_value(i.X.RT));
jit_value_t v;
jit_value_t ca;
GpVar ca(c.newGpVar());
if (!i.X.RB) {
// No shift, just a fancy sign extend and CA clearer.
v = rs32;
ca = e.get_int64(0);
c.cdqe(v);
c.mov(ca, imm(0));
} else {
v = jit_insn_sshr(f, rs32, e.get_uint32(i.X.RB));
// CA is set if any bits are shifted out of the right and if the result
// is negative. Start tracking that here.
c.mov(ca, v);
c.and_(ca, imm(1));
// Shift right and sign extend the 32bit part.
c.sar(v.r32(), imm(i.X.RB));
c.cdqe(v);
// CA is set to 1 if the low-order 32 bits of (RS) contain a negative number
// and any 1-bits are shifted out of position 63; otherwise CA is set to 0.
ca = jit_insn_and(f, jit_insn_lt(f, v, e.get_int32(0)),
jit_insn_lt(f, rs64, e.get_int64(0)));
// We already have ca set to indicate the pos 63 bit, now just and in sign.
GpVar ca_2(c.newGpVar());
c.mov(ca_2, v.r32());
c.shr(ca_2, imm(31));
c.and_(ca, ca_2);
}
v = e.sign_extend(v, jit_type_nint);
e.update_gpr_value(i.X.RA, v);
e.update_xer_with_carry(ca);
@ -1043,7 +1051,6 @@ XEEMITTER(srawix, 0x7C000670, X )(X64Emitter& e, X86Compiler& c, InstrDat
return 0;
}
#endif
XEEMITTER(srdx, 0x7C000436, X )(X64Emitter& e, X86Compiler& c, InstrData& i) {
XEINSTRNOTIMPLEMENTED();
@ -1121,7 +1128,7 @@ void X64RegisterEmitCategoryALU() {
XEREGISTERINSTR(sradx, 0x7C000634);
XEREGISTERINSTR(sradix, 0x7C000674);
XEREGISTERINSTR(srawx, 0x7C000630);
// XEREGISTERINSTR(srawix, 0x7C000670);
XEREGISTERINSTR(srawix, 0x7C000670);
XEREGISTERINSTR(srdx, 0x7C000436);
XEREGISTERINSTR(srwx, 0x7C000430);
}