(inst cqo)
(inst idiv eax y)
(if (location= quo eax)
- (inst shl eax 3)
- (inst lea quo (make-ea :qword :index eax :scale 8)))
+ (inst shl eax n-fixnum-tag-bits)
+ (inst lea quo (make-ea :qword :index eax
+ :scale (ash 1 n-fixnum-tag-bits))))
(move rem edx)))
(define-vop (fast-truncate-c/fixnum=>fixnum fast-safe-arith-op)
(setf y-arg (register-inline-constant :qword (fixnumize y))))
(inst idiv eax y-arg)
(if (location= quo eax)
- (inst shl eax 3)
- (inst lea quo (make-ea :qword :index eax :scale 8)))
+ (inst shl eax n-fixnum-tag-bits)
+ (inst lea quo (make-ea :qword :index eax
+ :scale (ash 1 n-fixnum-tag-bits))))
(move rem edx)))
(define-vop (fast-truncate/unsigned=>unsigned fast-safe-arith-op)