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JIT: optimize mulhwu

This commit is contained in:
Fiora 2014-10-19 04:53:01 -07:00
parent 5b5e462200
commit a666bb6bf6
1 changed files with 16 additions and 6 deletions
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22
Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
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@ -1017,20 +1017,30 @@ void Jit64::mulhwXx(UGeckoInstruction inst)
else
gpr.SetImmediate32(d, (u32)((gpr.R(a).offset * gpr.R(b).offset) >> 32));
}
else
else if (sign)
{
gpr.Lock(a, b, d);
// no register choice
gpr.FlushLockX(EDX, EAX);
gpr.BindToRegister(d, (d == a || d == b), true);
gpr.BindToRegister(d, d == a || d == b, true);
MOV(32, R(EAX), gpr.R(a));
gpr.KillImmediate(b, true, false);
if (sign)
IMUL(32, gpr.R(b));
else
MUL(32, gpr.R(b));
IMUL(32, gpr.R(b));
MOV(32, gpr.R(d), R(EDX));
}
else
{
// Not faster for signed because we'd need two movsx.
gpr.Lock(a, b, d);
// We need to bind everything to registers since the top 32 bits need to be zero.
int src = d == b ? a : b;
gpr.BindToRegister(d, d == a || d == b, true);
gpr.BindToRegister(src, true, false);
if (d != a && d != b)
MOV(32, gpr.R(d), gpr.R(a));
IMUL(64, gpr.RX(d), gpr.R(src));
SHR(64, gpr.R(d), Imm8(32));
}
if (inst.Rc)
ComputeRC(gpr.R(d));
gpr.UnlockAll();