shifts and rotates by 1 on ix86

[Alan Modra]

On Wed, 10 May 2000, Maciej W. Rozycki wrote:

>  However, implicit 1-bit shifts and rotates do set flags differently than
> the explicit forms.

Are you sure about this statement?  My reading of the Intel arch
instruction set manual indicates that the overflow flag is set
appropriately for 1 bit shifts, and undefined for > 1 bit shifts.
There is no mention of a difference depending on which of the one bit
shift instructions is used.

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