;;; (CEILING x 2^k) was optimized incorrectly
(loop for divisor in '(-4 4)
- for ceiler = (compile nil `(lambda (x)
- (declare (fixnum x))
- (declare (optimize (speed 3)))
- (ceiling x ,divisor)))
- do (loop for i from -5 to 5
- for exact-q = (/ i divisor)
- do (multiple-value-bind (q r)
- (funcall ceiler i)
- (assert (= (+ (* q divisor) r) i))
- (assert (<= exact-q q))
- (assert (< q (1+ exact-q))))))
+ for ceiler = (compile nil `(lambda (x)
+ (declare (fixnum x))
+ (declare (optimize (speed 3)))
+ (ceiling x ,divisor)))
+ do (loop for i from -5 to 5
+ for exact-q = (/ i divisor)
+ do (multiple-value-bind (q r)
+ (funcall ceiler i)
+ (assert (= (+ (* q divisor) r) i))
+ (assert (<= exact-q q))
+ (assert (< q (1+ exact-q))))))
+
+;;; (TRUNCATE x 2^k) was optimized incorrectly
+(loop for divisor in '(-4 4)
+ for truncater = (compile nil `(lambda (x)
+ (declare (fixnum x))
+ (declare (optimize (speed 3)))
+ (truncate x ,divisor)))
+ do (loop for i from -9 to 9
+ for exact-q = (/ i divisor)
+ do (multiple-value-bind (q r)
+ (funcall truncater i)
+ (assert (= (+ (* q divisor) r) i))
+ (assert (<= (abs q) (abs exact-q)))
+ (assert (< (abs exact-q) (1+ (abs q)))))))
;;; CEILING had a corner case, spotted by Paul Dietz
(assert (= (ceiling most-negative-fixnum (1+ most-positive-fixnum)) -1))
(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)))