Better support for NetBSD/current

[sbcl.git] / src / compiler / ppc / arith.lisp

diff --git a/src/compiler/ppc/arith.lisp b/src/compiler/ppc/arith.lisp
index 9f8c2f3..5f4bfe1 100644 (file)
--- a/src/compiler/ppc/arith.lisp
+++ b/src/compiler/ppc/arith.lisp
@@ -459,7 +459,7 @@
   (:temporary (:scs (non-descriptor-reg)) temp)
   (:translate *)
   (:generator 2
-    (inst srawi temp y 2)
+    (inst srawi temp y n-fixnum-tag-bits)
     (inst mullw r x temp)))
 
 (define-vop (fast-*-c/fixnum=>fixnum fast-fixnum-binop-c)
@@ -679,15 +679,27 @@
   (: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)
@@ -701,7 +713,7 @@
 (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)
@@ -711,7 +723,6 @@
           (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)
@@ -1006,28 +1017,6 @@
 \f
 ;;;; 32-bit logical operations
 
-(define-vop (merge-bits)
-  (:translate merge-bits)
-  (:args (shift :scs (signed-reg unsigned-reg))
-         (prev :scs (unsigned-reg))
-         (next :scs (unsigned-reg)))
-  (:arg-types tagged-num unsigned-num unsigned-num)
-  (:temporary (:scs (unsigned-reg) :to (:result 0)) temp)
-  (:temporary (:scs (unsigned-reg) :to (:result 0) :target result) res)
-  (:results (result :scs (unsigned-reg)))
-  (:result-types unsigned-num)
-  (:policy :fast-safe)
-  (:generator 4
-    (let ((done (gen-label)))
-      (inst cmpwi shift 0)
-      (inst beq done)
-      (inst srw res next shift)
-      (inst sub temp zero-tn shift)
-      (inst slw temp prev temp)
-      (inst or res res temp)
-      (emit-label done)
-      (move result res))))
-
 (define-vop (shift-towards-someplace)
   (:policy :fast-safe)
   (:args (num :scs (unsigned-reg))
@@ -1176,6 +1165,34 @@
     (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))
 
@@ -1187,11 +1204,11 @@
   (:results (digit :scs (unsigned-reg)))
   (:result-types unsigned-num)
   (:generator 1
-    (inst srawi digit fixnum 2)))
+    (inst srawi digit fixnum n-fixnum-tag-bits)))
 
 
 (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)
@@ -1229,7 +1246,7 @@
 #|
 
 (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)
@@ -1254,7 +1271,7 @@
   (:generator 1
     (sc-case res
       (any-reg
-       (inst slwi res digit 2))
+       (inst slwi res digit n-fixnum-tag-bits))
       (signed-reg
        (move res digit)))))