It's more about the non-destructive destination part, which can avoid a move. Compilers tend to prefer SHL/SAL of LEA because its encoding is shorter: https://godbolt.org/z/9Tsq3hKnY
replyshlx doesn't alter the flag register.
replySHLX does not support an immediate operand. Non-destructive shifts with immediate operands only arrive with APX, where they are among the most commonly used instructions (besides paired pushes/pops).
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