(:result-types tagged-num)
(:policy :fast-safe)
(:generator 2
- (inst rlwinm res x
- (mod (- 32 posn) 32) ; effectively rotate right
- (- 32 size n-fixnum-tag-bits)
- (- 31 n-fixnum-tag-bits))))
+ (let ((phantom-bits (- (+ size posn) 30)))
+ (cond
+ ((plusp phantom-bits)
+ ;; The byte to be loaded into RES includes sign bits which are not
+ ;; present in the input X physically. RLWINM as used below would
+ ;; mask these out with 0 even for negative inputs.
+ (inst srawi res x phantom-bits)
+ (inst rlwinm res x
+ (mod (- 32 posn (- phantom-bits)) 32)
+ (- 32 size n-fixnum-tag-bits)
+ (- 31 n-fixnum-tag-bits)))
+ (t
+ (inst rlwinm res x
+ (mod (- 32 posn) 32) ; effectively rotate right
+ (- 32 size n-fixnum-tag-bits)
+ (- 31 n-fixnum-tag-bits)))))))
(define-vop (ldb-c/signed)
(:translate %%ldb)
(:args (x :scs (signed-reg)))
- (:arg-types signed-num (:constant (integer 1 29)) (:constant (integer 0 29)))
+ (:arg-types signed-num (:constant (integer 1 29)) (:constant (integer 0 31)))
(:info size posn)
(:results (res :scs (any-reg)))
(:result-types tagged-num)
(define-vop (ldb-c/unsigned)
(:translate %%ldb)
(:args (x :scs (unsigned-reg)))
- (:arg-types unsigned-num (:constant (integer 1 29)) (:constant (integer 0 29)))
+ (:arg-types unsigned-num (:constant (integer 1 29)) (:constant (integer 0 31)))
(:info size posn)
(:results (res :scs (any-reg)))
(:result-types tagged-num)
(mod (- (+ 32 n-fixnum-tag-bits) posn) 32)
(- 32 size n-fixnum-tag-bits)
(- 31 n-fixnum-tag-bits))))
-
\f
;;;; Modular functions:
(define-modular-fun lognot-mod32 (x) lognot :untagged nil 32)
(inst mullw lo x y)
(inst mulhwu hi x y)))
+#!+multiply-high-vops
+(define-vop (mulhi)
+ (:translate sb!kernel:%multiply-high)
+ (:policy :fast-safe)
+ (:args (x :scs (unsigned-reg))
+ (y :scs (unsigned-reg)))
+ (:arg-types unsigned-num unsigned-num)
+ (:results (hi :scs (unsigned-reg)))
+ (:result-types unsigned-num)
+ (:generator 20
+ (inst mulhwu hi x y)))
+
+#!+multiply-high-vops
+(define-vop (mulhi/fx)
+ (:translate sb!kernel:%multiply-high)
+ (:policy :fast-safe)
+ (:args (x :scs (any-reg))
+ (y :scs (unsigned-reg)))
+ (:arg-types positive-fixnum unsigned-num)
+ (:temporary (:sc non-descriptor-reg :from :eval :to :result) temp)
+ (:temporary (:sc non-descriptor-reg :from :eval :to :result) mask)
+ (:results (hi :scs (any-reg)))
+ (:result-types positive-fixnum)
+ (:generator 15
+ (inst mulhwu temp x y)
+ (inst lr mask fixnum-tag-mask)
+ (inst andc hi temp mask)))
+
(define-vop (bignum-lognot lognot-mod32/unsigned=>unsigned)
(:translate sb!bignum:%lognot))
(define-vop (bignum-floor)
- (:translate sb!bignum:%floor)
+ (:translate sb!bignum:%bigfloor)
(:policy :fast-safe)
(:args (num-high :scs (unsigned-reg) :target rem)
(num-low :scs (unsigned-reg) :target rem-low)
#|
(define-vop (bignum-floor)
- (:translate sb!bignum:%floor)
+ (:translate sb!bignum:%bigfloor)
(:policy :fast-safe)
(:args (div-high :scs (unsigned-reg) :target rem)
(div-low :scs (unsigned-reg) :target quo)