+
+;;; x86 LEA bug:
+(assert (= (funcall
+ (compile nil '(lambda (x) (declare (bit x)) (+ x #xf0000000)))
+ 1)
+ #xf0000001))
+
+;;; LOGBITP on bignums:
+(dolist (x '(((1+ most-positive-fixnum) 1 nil)
+ ((1+ most-positive-fixnum) -1 t)
+ ((1+ most-positive-fixnum) (1+ most-positive-fixnum) nil)
+ ((1+ most-positive-fixnum) (1- most-negative-fixnum) t)
+ (1 (ash most-negative-fixnum 1) nil)
+ (29 most-negative-fixnum t)
+ (30 (ash most-negative-fixnum 1) t)
+ (31 (ash most-negative-fixnum 1) t)
+ (64 (ash most-negative-fixnum 36) nil)
+ (65 (ash most-negative-fixnum 36) t)))
+ (destructuring-bind (index int result) x
+ (assert (eq (eval `(logbitp ,index ,int)) result))))
+
+;;; off-by-1 type inference error for %DPB and %DEPOSIT-FIELD:
+(let ((f (compile nil '(lambda (b)
+ (integer-length (dpb b (byte 4 28) -1005))))))
+ (assert (= (funcall f 1230070) 32)))
+(let ((f (compile nil '(lambda (b)
+ (integer-length (deposit-field b (byte 4 28) -1005))))))
+ (assert (= (funcall f 1230070) 32)))
+
+;;; type inference leading to an internal compiler error:
+(let ((f (compile nil '(lambda (x)
+ (declare (type fixnum x))
+ (ldb (byte 0 0) x)))))
+ (assert (= (funcall f 1) 0))
+ (assert (= (funcall f most-positive-fixnum) 0))
+ (assert (= (funcall f -1) 0)))
+
+;;; Alpha bignum arithmetic bug:
+(assert (= (* 966082078641 419216044685) 404997107848943140073085))
+
+;;; Alpha smallnum arithmetic bug:
+(assert (= (ash -129876 -1026) -1))
+
+;;; Alpha middlenum (yes, really! Affecting numbers between 2^32 and
+;;; 2^64 :) arithmetic bug
+(let ((fn (compile nil '(LAMBDA (A B C D)
+ (DECLARE (TYPE (INTEGER -1621 -513) A)
+ (TYPE (INTEGER -3 34163) B)
+ (TYPE (INTEGER -9485132993 81272960) C)
+ (TYPE (INTEGER -255340814 519943) D)
+ (IGNORABLE A B C D)
+ (OPTIMIZE (SPEED 3) (SAFETY 1) (DEBUG 1)))
+ (TRUNCATE C (MIN -100 4149605))))))
+ (assert (= (funcall fn -1332 5864 -6963328729 -43789079) 69633287)))
+
+;;; Here's another fantastic Alpha backend bug: the code to load
+;;; immediate 64-bit constants into a register was wrong.
+(let ((fn (compile nil '(LAMBDA (A B C D)
+ (DECLARE (TYPE (INTEGER -3563 2733564) A)
+ (TYPE (INTEGER -548947 7159) B)
+ (TYPE (INTEGER -19 0) C)
+ (TYPE (INTEGER -2546009 0) D)
+ (IGNORABLE A B C D)
+ (OPTIMIZE (SPEED 3) (SAFETY 1) (DEBUG 1)))
+ (CASE A
+ ((89 125 16) (ASH A (MIN 18 -706)))
+ (T (DPB -3 (BYTE 30 30) -1)))))))
+ (assert (= (funcall fn 1227072 -529823 -18 -792831) -2147483649)))
+
+;;; ASH of a negative bignum by a bignum count would erroneously
+;;; return 0 prior to sbcl-0.8.4.4
+(assert (= (ash (1- most-negative-fixnum) (1- most-negative-fixnum)) -1))
+
+;;; Whoops. Too much optimization in division operators for 0
+;;; divisor.
+(macrolet ((frob (name)
+ `(let ((fn (compile nil '(lambda (x)
+ (declare (optimize speed) (fixnum x))
+ (,name x 0)))))
+ (assert (raises-error? (funcall fn 1) division-by-zero)))))
+ (frob mod)
+ (frob truncate)
+ (frob rem)
+ (frob /)
+ (frob floor)
+ (frob ceiling))