X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fx86%2Farith.lisp;h=4abd9c63b014d516649531ccfa13645730913224;hb=7deecae2d959173eda6a153d490c752c32050a9e;hp=ce684ee6fb95880e6f46f9809a64e4687d0dd494;hpb=34360bf475b3632f625fcc263f626557ef96d94f;p=sbcl.git

diff --git a/src/compiler/x86/arith.lisp b/src/compiler/x86/arith.lisp
index ce684ee..4abd9c6 100644
--- a/src/compiler/x86/arith.lisp
+++ b/src/compiler/x86/arith.lisp
@@ -46,13 +46,13 @@
 
 (define-vop (fast-lognot/fixnum fixnum-unop)
   (:translate lognot)
-  (:generator 2
+  (:generator 1
     (move res x)
     (inst xor res (fixnumize -1))))
 
 (define-vop (fast-lognot/signed signed-unop)
   (:translate lognot)
-  (:generator 1
+  (:generator 2
     (move res x)
     (inst not res)))
 
@@ -359,7 +359,7 @@
   (:note "inline fixnum arithmetic")
   (:generator 4
     (move r x)
-    (inst sar r 2)
+    (inst sar r n-fixnum-tag-bits)
     (inst imul r y)))
 
 (define-vop (fast-*-c/fixnum=>fixnum fast-safe-arith-op)
@@ -436,7 +436,7 @@
   (:vop-var vop)
   (:save-p :compute-only)
   (:generator 31
-    (let ((zero (generate-error-code vop division-by-zero-error x y)))
+    (let ((zero (generate-error-code vop 'division-by-zero-error x y)))
       (if (sc-is y any-reg)
           (inst test y y)  ; smaller instruction
           (inst cmp y 0))
@@ -445,8 +445,9 @@
     (inst cdq)
     (inst idiv eax y)
     (if (location= quo eax)
-        (inst shl eax 2)
-        (inst lea quo (make-ea :dword :index eax :scale 4)))
+        (inst shl eax n-fixnum-tag-bits)
+        (inst lea quo (make-ea :dword :index eax
+                               :scale (ash 1 n-fixnum-tag-bits))))
     (move rem edx)))
 
 (define-vop (fast-truncate-c/fixnum=>fixnum fast-safe-arith-op)
@@ -471,8 +472,9 @@
     (inst mov y-arg (fixnumize y))
     (inst idiv eax y-arg)
     (if (location= quo eax)
-        (inst shl eax 2)
-        (inst lea quo (make-ea :dword :index eax :scale 4)))
+        (inst shl eax n-fixnum-tag-bits)
+        (inst lea quo (make-ea :dword :index eax
+                               :scale (ash 1 n-fixnum-tag-bits))))
     (move rem edx)))
 
 (define-vop (fast-truncate/unsigned=>unsigned fast-safe-arith-op)
@@ -491,7 +493,7 @@
   (:vop-var vop)
   (:save-p :compute-only)
   (:generator 33
-    (let ((zero (generate-error-code vop division-by-zero-error x y)))
+    (let ((zero (generate-error-code vop 'division-by-zero-error x y)))
       (if (sc-is y unsigned-reg)
           (inst test y y)  ; smaller instruction
           (inst cmp y 0))
@@ -542,7 +544,7 @@
   (:vop-var vop)
   (:save-p :compute-only)
   (:generator 33
-    (let ((zero (generate-error-code vop division-by-zero-error x y)))
+    (let ((zero (generate-error-code vop 'division-by-zero-error x y)))
       (if (sc-is y signed-reg)
           (inst test y y)  ; smaller instruction
           (inst cmp y 0))
@@ -597,24 +599,27 @@
   (:note "inline ASH")
   (:generator 2
     (cond ((and (= amount 1) (not (location= number result)))
-           (inst lea result (make-ea :dword :index number :scale 2)))
+           (inst lea result (make-ea :dword :base number :index number)))
           ((and (= amount 2) (not (location= number result)))
            (inst lea result (make-ea :dword :index number :scale 4)))
           ((and (= amount 3) (not (location= number result)))
            (inst lea result (make-ea :dword :index number :scale 8)))
           (t
            (move result number)
-           (cond ((plusp amount)
-                  ;; We don't have to worry about overflow because of the
-                  ;; result type restriction.
-                  (inst shl result amount))
-                 (t
-                  ;; If the amount is greater than 31, only shift by 31. We
-                  ;; have to do this because the shift instructions only look
-                  ;; at the low five bits of the result.
-                  (inst sar result (min 31 (- amount)))
-                  ;; Fixnum correction.
-                  (inst and result (lognot fixnum-tag-mask))))))))
+           (cond ((< -32 amount 32)
+                  ;; this code is used both in ASH and ASH-SMOD30, so
+                  ;; be careful
+                  (if (plusp amount)
+                      (inst shl result amount)
+                      (progn
+                        (inst sar result (- amount))
+                        (inst and result (lognot fixnum-tag-mask)))))
+                 ((plusp amount)
+                  (if (sc-is result any-reg)
+                      (inst xor result result)
+                      (inst mov result 0)))
+                 (t (inst sar result 31)
+                    (inst and result (lognot fixnum-tag-mask))))))))
 
 (define-vop (fast-ash-left/fixnum=>fixnum)
   (:translate ash)
@@ -655,7 +660,7 @@
   (:note "inline ASH")
   (:generator 3
     (cond ((and (= amount 1) (not (location= number result)))
-           (inst lea result (make-ea :dword :index number :scale 2)))
+           (inst lea result (make-ea :dword :base number :index number)))
           ((and (= amount 2) (not (location= number result)))
            (inst lea result (make-ea :dword :index number :scale 4)))
           ((and (= amount 3) (not (location= number result)))
@@ -682,7 +687,7 @@
   (:note "inline ASH")
   (:generator 3
     (cond ((and (= amount 1) (not (location= number result)))
-           (inst lea result (make-ea :dword :index number :scale 2)))
+           (inst lea result (make-ea :dword :base number :index number)))
           ((and (= amount 2) (not (location= number result)))
            (inst lea result (make-ea :dword :index number :scale 4)))
           ((and (= amount 3) (not (location= number result)))
@@ -920,7 +925,9 @@
   (:result-types unsigned-num)
   (:generator 28
     (move res arg)
-    (inst cmp res 0)
+    (if (sc-is res unsigned-reg)
+        (inst test res res)
+        (inst cmp res 0))
     (inst jmp :ge POS)
     (inst not res)
     POS
@@ -953,49 +960,58 @@
   (:translate logcount)
   (:note "inline (unsigned-byte 32) logcount")
   (:policy :fast-safe)
-  (:args (arg :scs (unsigned-reg)))
+  (:args (arg :scs (unsigned-reg) :target result))
   (:arg-types unsigned-num)
   (:results (result :scs (unsigned-reg)))
   (:result-types positive-fixnum)
-  (:temporary (:sc unsigned-reg :from (:argument 0)) temp)
-  (:generator 30
+  (:temporary (:sc unsigned-reg) temp)
+  (:generator 14
+    ;; See the comments below for how the algorithm works. The tricks
+    ;; used can be found for example in AMD's software optimization
+    ;; guide or at "http://www.hackersdelight.org/HDcode/pop.cc" in the
+    ;; function "pop1".
+    ;; Calculate 2-bit sums. Note that the value of a two-digit binary
+    ;; number is the sum of the right digit and twice the left digit.
+    ;; Thus we can calculate the sum of the two digits by shifting the
+    ;; left digit to the right position and doing a two-bit subtraction.
+    ;; This subtraction will never create a borrow and thus can be made
+    ;; on all 16 2-digit numbers at once.
     (move result arg)
-
-    (inst mov temp result)
-    (inst shr temp 1)
+    (move temp arg)
+    (inst shr result 1)
     (inst and result #x55555555)
-    (inst and temp #x55555555)
-    (inst add result temp)
-
-    (inst mov temp result)
+    (inst sub temp result)
+    ;; Calculate 4-bit sums by straightforward shift, mask and add.
+    ;; Note that we shift the source operand of the MOV and not its
+    ;; destination so that the SHR and the MOV can execute in the same
+    ;; clock cycle.
+    (inst mov result temp)
     (inst shr temp 2)
     (inst and result #x33333333)
     (inst and temp #x33333333)
     (inst add result temp)
-
+    ;; Calculate 8-bit sums. Since each sum is at most 8, which fits
+    ;; into 4 bits, we can apply the mask after the addition, saving one
+    ;; instruction.
     (inst mov temp result)
-    (inst shr temp 4)
-    (inst and result #x0f0f0f0f)
-    (inst and temp #x0f0f0f0f)
+    (inst shr result 4)
     (inst add result temp)
-
+    (inst and result #x0f0f0f0f)
+    ;; Calculate the two 16-bit sums and the 32-bit sum. No masking is
+    ;; necessary inbetween since the final sum is at most 32 which fits
+    ;; into 6 bits.
     (inst mov temp result)
-    (inst shr temp 8)
-    (inst and result #x00ff00ff)
-    (inst and temp #x00ff00ff)
+    (inst shr result 8)
     (inst add result temp)
-
     (inst mov temp result)
-    (inst shr temp 16)
-    (inst and result #x0000ffff)
-    (inst and temp #x0000ffff)
-    (inst add result temp)))
+    (inst shr result 16)
+    (inst add result temp)
+    (inst and result #xff)))
 
 ;;;; binary conditional VOPs
 
 (define-vop (fast-conditional)
-  (:conditional)
-  (:info target not-p)
+  (:conditional :e)
   (:effects)
   (:affected)
   (:policy :fast-safe))
@@ -1011,7 +1027,7 @@
 (define-vop (fast-conditional-c/fixnum fast-conditional/fixnum)
   (:args (x :scs (any-reg control-stack)))
   (:arg-types tagged-num (:constant (signed-byte 30)))
-  (:info target not-p y))
+  (:info y))
 
 (define-vop (fast-conditional/signed fast-conditional)
   (:args (x :scs (signed-reg)
@@ -1024,7 +1040,7 @@
 (define-vop (fast-conditional-c/signed fast-conditional/signed)
   (:args (x :scs (signed-reg signed-stack)))
   (:arg-types signed-num (:constant (signed-byte 32)))
-  (:info target not-p y))
+  (:info y))
 
 (define-vop (fast-conditional/unsigned fast-conditional)
   (:args (x :scs (unsigned-reg)
@@ -1037,7 +1053,7 @@
 (define-vop (fast-conditional-c/unsigned fast-conditional/unsigned)
   (:args (x :scs (unsigned-reg unsigned-stack)))
   (:arg-types unsigned-num (:constant (unsigned-byte 32)))
-  (:info target not-p y))
+  (:info y))
 
 (macrolet ((define-logtest-vops ()
              `(progn
@@ -1049,11 +1065,12 @@
                        `(define-vop (,(symbolicate "FAST-LOGTEST" suffix)
                                      ,(symbolicate "FAST-CONDITIONAL" suffix))
                          (:translate logtest)
+                         (:conditional :ne)
                          (:generator ,cost
-                          (inst test x ,(if (eq suffix '-c/fixnum)
-                                            '(fixnumize y)
-                                            'y))
-                          (inst jmp (if not-p :e :ne) target)))))))
+                          (emit-optimized-test-inst x
+                                                    ,(if (eq suffix '-c/fixnum)
+                                                         '(fixnumize y)
+                                                         'y))))))))
   (define-logtest-vops))
 
 (defknown %logbitp (integer unsigned-byte) boolean
@@ -1066,42 +1083,42 @@
 ;;; too much work to do the non-constant case (maybe?)
 (define-vop (fast-logbitp-c/fixnum fast-conditional-c/fixnum)
   (:translate %logbitp)
+  (:conditional :c)
   (:arg-types tagged-num (:constant (integer 0 29)))
   (:generator 4
-    (inst bt x (+ y n-fixnum-tag-bits))
-    (inst jmp (if not-p :nc :c) target)))
+    (inst bt x (+ y n-fixnum-tag-bits))))
 
 (define-vop (fast-logbitp/signed fast-conditional/signed)
   (:args (x :scs (signed-reg signed-stack))
          (y :scs (signed-reg)))
   (:translate %logbitp)
+  (:conditional :c)
   (:generator 6
-    (inst bt x y)
-    (inst jmp (if not-p :nc :c) target)))
+    (inst bt x y)))
 
 (define-vop (fast-logbitp-c/signed fast-conditional-c/signed)
   (:translate %logbitp)
+  (:conditional :c)
   (:arg-types signed-num (:constant (integer 0 31)))
   (:generator 5
-    (inst bt x y)
-    (inst jmp (if not-p :nc :c) target)))
+    (inst bt x y)))
 
 (define-vop (fast-logbitp/unsigned fast-conditional/unsigned)
   (:args (x :scs (unsigned-reg unsigned-stack))
          (y :scs (unsigned-reg)))
   (:translate %logbitp)
+  (:conditional :c)
   (:generator 6
-    (inst bt x y)
-    (inst jmp (if not-p :nc :c) target)))
+    (inst bt x y)))
 
 (define-vop (fast-logbitp-c/unsigned fast-conditional-c/unsigned)
   (:translate %logbitp)
+  (:conditional :c)
   (:arg-types unsigned-num (:constant (integer 0 31)))
   (:generator 5
-    (inst bt x y)
-    (inst jmp (if not-p :nc :c) target)))
+    (inst bt x y)))
 
-(macrolet ((define-conditional-vop (tran cond unsigned not-cond not-unsigned)
+(macrolet ((define-conditional-vop (tran cond unsigned)
              `(progn
                 ,@(mapcar
                    (lambda (suffix cost signed)
@@ -1113,31 +1130,25 @@
                                      (format nil "~:@(FAST-CONDITIONAL~A~)"
                                              suffix)))
                         (:translate ,tran)
+                        (:conditional ,(if signed
+                                           cond
+                                           unsigned))
                         (:generator ,cost
                                     (inst cmp x
                                           ,(if (eq suffix '-c/fixnum)
                                                '(fixnumize y)
-                                               'y))
-                                    (inst jmp (if not-p
-                                                  ,(if signed
-                                                       not-cond
-                                                       not-unsigned)
-                                                  ,(if signed
-                                                       cond
-                                                       unsigned))
-                                          target))))
+                                               'y)))))
                    '(/fixnum -c/fixnum /signed -c/signed /unsigned -c/unsigned)
                    '(4 3 6 5 6 5)
                    '(t t t t nil nil)))))
 
-  (define-conditional-vop < :l :b :ge :ae)
-  (define-conditional-vop > :g :a :le :be))
+  (define-conditional-vop < :l :b)
+  (define-conditional-vop > :g :a))
 
 (define-vop (fast-if-eql/signed fast-conditional/signed)
   (:translate eql)
   (:generator 6
-    (inst cmp x y)
-    (inst jmp (if not-p :ne :e) target)))
+    (inst cmp x y)))
 
 (define-vop (fast-if-eql-c/signed fast-conditional-c/signed)
   (:translate eql)
@@ -1145,14 +1156,12 @@
     (cond ((and (sc-is x signed-reg) (zerop y))
            (inst test x x))  ; smaller instruction
           (t
-           (inst cmp x y)))
-    (inst jmp (if not-p :ne :e) target)))
+           (inst cmp x y)))))
 
 (define-vop (fast-if-eql/unsigned fast-conditional/unsigned)
   (:translate eql)
   (:generator 6
-    (inst cmp x y)
-    (inst jmp (if not-p :ne :e) target)))
+    (inst cmp x y)))
 
 (define-vop (fast-if-eql-c/unsigned fast-conditional-c/unsigned)
   (:translate eql)
@@ -1160,8 +1169,7 @@
     (cond ((and (sc-is x unsigned-reg) (zerop y))
            (inst test x x))  ; smaller instruction
           (t
-           (inst cmp x y)))
-    (inst jmp (if not-p :ne :e) target)))
+           (inst cmp x y)))))
 
 ;;; EQL/FIXNUM is funny because the first arg can be of any type, not just a
 ;;; known fixnum.
@@ -1181,8 +1189,7 @@
   (:note "inline fixnum comparison")
   (:translate eql)
   (:generator 4
-    (inst cmp x y)
-    (inst jmp (if not-p :ne :e) target)))
+    (inst cmp x y)))
 (define-vop (generic-eql/fixnum fast-eql/fixnum)
   (:args (x :scs (any-reg descriptor-reg)
             :load-if (not (and (sc-is x control-stack)
@@ -1194,14 +1201,13 @@
 (define-vop (fast-eql-c/fixnum fast-conditional/fixnum)
   (:args (x :scs (any-reg control-stack)))
   (:arg-types tagged-num (:constant (signed-byte 30)))
-  (:info target not-p y)
+  (:info y)
   (:translate eql)
   (:generator 2
     (cond ((and (sc-is x any-reg) (zerop y))
            (inst test x x))  ; smaller instruction
           (t
-           (inst cmp x (fixnumize y))))
-    (inst jmp (if not-p :ne :e) target)))
+           (inst cmp x (fixnumize y))))))
 (define-vop (generic-eql-c/fixnum fast-eql-c/fixnum)
   (:args (x :scs (any-reg descriptor-reg control-stack)))
   (:arg-types * (:constant (signed-byte 30)))
@@ -1209,21 +1215,6 @@
 
 ;;;; 32-bit logical operations
 
-(define-vop (merge-bits)
-  (:translate merge-bits)
-  (:args (shift :scs (signed-reg unsigned-reg) :target ecx)
-         (prev :scs (unsigned-reg) :target result)
-         (next :scs (unsigned-reg)))
-  (:arg-types tagged-num unsigned-num unsigned-num)
-  (:temporary (:sc signed-reg :offset ecx-offset :from (:argument 0)) ecx)
-  (:results (result :scs (unsigned-reg) :from (:argument 1)))
-  (:result-types unsigned-num)
-  (:policy :fast-safe)
-  (:generator 4
-    (move ecx shift)
-    (move result prev)
-    (inst shrd result next :cl)))
-
 ;;; Only the lower 5 bits of the shift amount are significant.
 (define-vop (shift-towards-someplace)
   (:policy :fast-safe)
@@ -1306,8 +1297,8 @@
                    (svop30f (intern (format nil "FAST-~S-SMOD30/FIXNUM=>FIXNUM" name)))
                    (svop30cf (intern (format nil "FAST-~S-SMOD30-C/FIXNUM=>FIXNUM" name))))
                `(progn
-                  (define-modular-fun ,fun32 (x y) ,name :unsigned 32)
-                  (define-modular-fun ,sfun30 (x y) ,name :signed 30)
+                  (define-modular-fun ,fun32 (x y) ,name :untagged nil 32)
+                  (define-modular-fun ,sfun30 (x y) ,name :tagged t 30)
                   (define-mod-binop (,vop32u ,vopu) ,fun32)
                   (define-vop (,vop32f ,vopf) (:translate ,fun32))
                   (define-vop (,svop30f ,vopf) (:translate ,sfun30))
@@ -1353,19 +1344,19 @@
   (signed-byte 30)
   (foldable flushable movable))
 
-(define-modular-fun-optimizer %lea ((base index scale disp) :unsigned :width width)
+(define-modular-fun-optimizer %lea ((base index scale disp) :untagged nil :width width)
   (when (and (<= width 32)
              (constant-lvar-p scale)
              (constant-lvar-p disp))
-    (cut-to-width base :unsigned width)
-    (cut-to-width index :unsigned width)
+    (cut-to-width base :untagged width nil)
+    (cut-to-width index :untagged width nil)
     'sb!vm::%lea-mod32))
-(define-modular-fun-optimizer %lea ((base index scale disp) :signed :width width)
+(define-modular-fun-optimizer %lea ((base index scale disp) :tagged t :width width)
   (when (and (<= width 30)
              (constant-lvar-p scale)
              (constant-lvar-p disp))
-    (cut-to-width base :signed width)
-    (cut-to-width index :signed width)
+    (cut-to-width base :tagged width t)
+    (cut-to-width index :tagged width t)
     'sb!vm::%lea-smod30))
 
 #+sb-xc-host
@@ -1399,7 +1390,7 @@
   (:translate %lea-smod30))
 
 ;;; logical operations
-(define-modular-fun lognot-mod32 (x) lognot :unsigned 32)
+(define-modular-fun lognot-mod32 (x) lognot :untagged nil 32)
 (define-vop (lognot-mod32/word=>unsigned)
   (:translate lognot-mod32)
   (:args (x :scs (unsigned-reg signed-reg unsigned-stack signed-stack) :target r
@@ -1422,20 +1413,6 @@
     (move r x)
     (inst not r)))
 
-(define-modular-fun logxor-mod32 (x y) logxor :unsigned 32)
-(define-mod-binop (fast-logxor-mod32/word=>unsigned
-                   fast-logxor/unsigned=>unsigned)
-    logxor-mod32)
-(define-mod-binop-c (fast-logxor-mod32-c/word=>unsigned
-                     fast-logxor-c/unsigned=>unsigned)
-    logxor-mod32)
-(define-vop (fast-logxor-mod32/fixnum=>fixnum
-             fast-logxor/fixnum=>fixnum)
-  (:translate logxor-mod32))
-(define-vop (fast-logxor-mod32-c/fixnum=>fixnum
-             fast-logxor-c/fixnum=>fixnum)
-  (:translate logxor-mod32))
-
 (define-source-transform logeqv (&rest args)
   (if (oddp (length args))
       `(logxor ,@args)
@@ -1465,7 +1442,9 @@
 
 (define-full-reffer bignum-ref * bignum-digits-offset other-pointer-lowtag
   (unsigned-reg) unsigned-num sb!bignum:%bignum-ref)
-
+(define-full-reffer+offset bignum-ref-with-offset *
+  bignum-digits-offset other-pointer-lowtag
+  (unsigned-reg) unsigned-num sb!bignum:%bignum-ref-with-offset)
 (define-full-setter bignum-set * bignum-digits-offset other-pointer-lowtag
   (unsigned-reg) unsigned-num sb!bignum:%bignum-set)
 
@@ -1474,11 +1453,9 @@
   (:policy :fast-safe)
   (:args (digit :scs (unsigned-reg)))
   (:arg-types unsigned-num)
-  (:conditional)
-  (:info target not-p)
+  (:conditional :ns)
   (:generator 3
-    (inst or digit digit)
-    (inst jmp (if not-p :s :ns) target)))
+    (inst or digit digit)))
 
 
 ;;; For add and sub with carry the sc of carry argument is any-reg so
@@ -1606,7 +1583,7 @@
   (:result-types unsigned-num)
   (:generator 1
     (move digit fixnum)
-    (inst sar digit 2)))
+    (inst sar digit n-fixnum-tag-bits)))
 
 (define-vop (bignum-floor)
   (:translate sb!bignum:%floor)
@@ -1642,7 +1619,7 @@
   (:generator 1
     (move res digit)
     (when (sc-is res any-reg control-stack)
-      (inst shl res 2))))
+      (inst shl res n-fixnum-tag-bits))))
 
 (define-vop (digit-ashr)
   (:translate sb!bignum:%ashr)
@@ -1655,11 +1632,25 @@
                     :load-if (not (and (sc-is result unsigned-stack)
                                        (location= digit result)))))
   (:result-types unsigned-num)
-  (:generator 1
+  (:generator 2
     (move result digit)
     (move ecx count)
     (inst sar result :cl)))
 
+(define-vop (digit-ashr/c)
+  (:translate sb!bignum:%ashr)
+  (:policy :fast-safe)
+  (:args (digit :scs (unsigned-reg unsigned-stack) :target result))
+  (:arg-types unsigned-num (:constant (integer 0 31)))
+  (:info count)
+  (:results (result :scs (unsigned-reg) :from (:argument 0)
+                    :load-if (not (and (sc-is result unsigned-stack)
+                                       (location= digit result)))))
+  (:result-types unsigned-num)
+  (:generator 1
+    (move result digit)
+    (inst sar result count)))
+
 (define-vop (digit-lshr digit-ashr)
   (:translate sb!bignum:%digit-logical-shift-right)
   (:generator 1
@@ -1711,10 +1702,7 @@
   (:results (y :scs (unsigned-reg) :from (:eval 0)))
   (:result-types unsigned-num)
   (:generator 50
-    (inst mov k (make-ea :dword :base state
-                         :disp (- (* (+ 2 vector-data-offset)
-                                     n-word-bytes)
-                                  other-pointer-lowtag)))
+    (loadw k state (+ 2 vector-data-offset) other-pointer-lowtag)
     (inst cmp k 624)
     (inst jmp :ne no-update)
     (inst mov tmp state)        ; The state is passed in EAX.
@@ -1723,25 +1711,15 @@
     (inst xor k k)
     NO-UPDATE
     ;; y = ptgfsr[k++];
-    (inst mov y (make-ea :dword :base state :index k :scale 4
-                         :disp (- (* (+ 3 vector-data-offset)
-                                     n-word-bytes)
-                                  other-pointer-lowtag)))
+    (inst mov y (make-ea-for-vector-data state :index k :offset 3))
     ;; y ^= (y >> 11);
     (inst shr y 11)
-    (inst xor y (make-ea :dword :base state :index k :scale 4
-                         :disp (- (* (+ 3 vector-data-offset)
-                                     n-word-bytes)
-                                  other-pointer-lowtag)))
+    (inst xor y (make-ea-for-vector-data state :index k :offset 3))
     ;; y ^= (y << 7) & #x9d2c5680
     (inst mov tmp y)
     (inst inc k)
     (inst shl tmp 7)
-    (inst mov (make-ea :dword :base state
-                       :disp (- (* (+ 2 vector-data-offset)
-                                   n-word-bytes)
-                                other-pointer-lowtag))
-          k)
+    (storew k state (+ 2 vector-data-offset) other-pointer-lowtag)
     (inst and tmp #x9d2c5680)
     (inst xor y tmp)
     ;; y ^= (y << 15) & #xefc60000