fxsra[procedure] fxsll fixnum1 fixnum2
[procedure] fxsrl fixnum1 fixnum2
[procedure] fxsra fixnum1 fixnum2
ChezScheme: fixnum-specific shift operations.
See fixnum? for other fixnum operations.
In R6RS, these are covered by fxarithmetic-shift-left,
and fxarithmetic-shift-right. (fxsrl may be realized
by fxcopy-bit-field?).
Chicken has fxshl and fxshr.
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