ash

(ash integer count)

Arithmetic shift of integer by count bit positions: left (toward more significant bits) when count is non-negative, right (with sign extension) when count is negative. The result is an exact integer of any magnitude on every backend. A left shift whose result cannot be built -- 2147483647 bits or wider, or a count past 33554432 on the wasm-GC backends -- signals a catchable simple-error reporting ASH: shift count too large: and the count. Zero stays zero at any count, and a right shift past the value's width answers 0 or -1.