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Henrik Gramner authored
Most VEX-encoded instructions require an additional byte to encode when src2 is a high register (e.g. x|ymm8..15). If the instruction is commutative we can swap src1 and src2 when doing so reduces the instruction length, e.g. vpaddw xmm0, xmm0, xmm8 -> vpaddw xmm0, xmm8, xmm0
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