#elisp
Function:
ash integer1 count
ash (arithmetic shift) shifts the bits in integer1 to the left count places, or to the right if count is negative.
ash gives the same results as lsh except when integer1 and count are both negative. In that case,
ash puts ones in the empty bit positions on the left, while
lsh puts zeros in those bit positions.
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GNU Emacs Lisp Reference Manual: Bitwise Operations) ; left shift
⇒ -2
In binary, the argument looks like this:
;; Decimal 536,870,911
0111...111111 (30 bits total)
which becomes the following when left shifted:
;; Decimal -2
1111...111110 (30 bits total)
<span>Function: ash integer1 count
ash (arithmetic shift) shifts the bits in integer1
to the left count places, or to the right if count
is negative.
ash gives the same results as lsh except when
integer1 and count are both negative. In that case,
ash puts ones in the empty bit positions on the left, while
lsh puts zeros in those bit positions.
Thus, with ash , shifting the pattern of bits one place to the right
looks like this:
(ash -6 -1) ⇒ -3
;; Decimal -6 becomes decimal -3.
1111...111010 (30 bits total)
⇒
1111.. Summary
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