Neo: V_MAD_MIX opcodes

[mikusp]

<118>V_MAD_MIX_F32 v4, v0, v1, v2 op_sel_hi(0,0,0) = 0x41200000 [Test passed!]
<118>V_MAD_MIX_F32 v5, v3, v3, v2 op_sel_hi(1,1,0) op_sel(1,0,0) = 0x41D00000 [Test passed!]
<118>V_MAD_MIX_F32 v4, vcc_lo, vcc_lo, 0 op_sel_hi(1,1,0) op_sel(0,1,0) = 0x40C00000 [Test passed!]

v0 = 0x40000000; // 2.0
v1 = 0x40400000; // 3.0
v2 = 0x40800000; // 4.0
v3 = 0x51803800; // 44.0 : 0.5
vcc_lo = v3

For some reason vcc_lo seems to be unusable as an operand, instead of 44*0.5+3 I got 0*0+3 as a result, hence the last test is failed
vcc_lo works fine, the problem was in the tests