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For example:

You may get better SLEIGH compilation (better PCODE) if you minimize internal branching and opt for the next instruction instead.

This could be rewritten with something like:

    if ((Pu_9_8[0, 1])) goto inst_next;
    Rd_4_0 = (Rs_20_16 << 16);

For example:

Only the most significant piece should be signed as the sign in any non-most significant will saturate the high bits if their signed bit is set.

If s16_27_21=0b1000000 and s16_13_5=0b000000000, the 16-bit result would be 0xffc0 because bit 27 saturated leading bits. Whereas you would probably expect it to be 0x0040