double->single float conversion isn't a no-op on x87 anymore

[sbcl.git] / src / compiler / srctran.lisp

diff --git a/src/compiler/srctran.lisp b/src/compiler/srctran.lisp
index 713a106..221eaf0 100644 (file)
--- a/src/compiler/srctran.lisp
+++ b/src/compiler/srctran.lisp
@@ -2771,8 +2771,13 @@
   (defun %ash/right (integer amount)
     (ash integer (- amount)))
 
-  (deftransform ash ((integer amount) (sb!vm:signed-word (integer * 0)))
+  (deftransform ash ((integer amount))
     "Convert ASH of signed word to %ASH/RIGHT"
+    (unless (and (csubtypep (lvar-type integer) ; do that ourselves to avoid
+                            (specifier-type 'sb!vm:signed-word)) ; optimization
+                 (csubtypep (lvar-type amount)  ; notes.
+                            (specifier-type '(integer * 0))))
+      (give-up-ir1-transform))
     (when (constant-lvar-p amount)
       (give-up-ir1-transform))
     (let ((use (lvar-uses amount)))
@@ -2789,8 +2794,13 @@
                                       ,(1- sb!vm:n-word-bits)
                                       (- amount)))))))
 
-  (deftransform ash ((integer amount) (word (integer * 0)))
+  (deftransform ash ((integer amount))
     "Convert ASH of word to %ASH/RIGHT"
+    (unless (and (csubtypep (lvar-type integer)
+                            (specifier-type 'sb!vm:word))
+                 (csubtypep (lvar-type amount)
+                            (specifier-type '(integer * 0))))
+      (give-up-ir1-transform))
     (when (constant-lvar-p amount)
       (give-up-ir1-transform))
     (let ((use (lvar-uses amount)))
@@ -3113,6 +3123,24 @@
               (cut-to-width x kind w t)
               nil                ; After fixing above, replace with T.
               )))))))
+
+(defoptimizer (logior optimizer) ((x y) node)
+  (let ((result-type (single-value-type (node-derived-type node))))
+    (multiple-value-bind (low high)
+        (integer-type-numeric-bounds result-type)
+      (when (and (numberp low)
+                 (numberp high)
+                 (<= high 0))
+        (let ((width (integer-length low)))
+          (multiple-value-bind (w kind)
+              (best-modular-version (1+ width) t)
+            (when w
+              ;; FIXME: see comment in LOGAND optimizer
+              (let ((xact (cut-to-width x kind w t))
+                    (yact (cut-to-width y kind w t)))
+                (declare (ignore xact yact))
+                nil) ; After fixing above, replace with T
+              )))))))
 \f
 ;;; miscellanous numeric transforms
 
@@ -3383,14 +3411,17 @@
   (def logxor -1 (lognot x))
   (def logxor 0 x))
 
+(defun least-zero-bit (x)
+  (and (/= x -1)
+       (1- (integer-length (logxor x (1+ x))))))
+
 (deftransform logand ((x y) (* (constant-arg t)) *)
   "fold identity operation"
-  (let ((y (lvar-value y)))
-    (unless (and (plusp y)
-                 (= y (1- (ash 1 (integer-length y)))))
-      (give-up-ir1-transform))
-    (unless (csubtypep (lvar-type x)
-                       (specifier-type `(integer 0 ,y)))
+  (let* ((y (lvar-value y))
+         (width (or (least-zero-bit y) '*)))
+    (unless (and (neq width 0) ; (logand x 0) handled elsewhere
+                 (csubtypep (lvar-type x)
+                            (specifier-type `(unsigned-byte ,width))))
       (give-up-ir1-transform))
     'x))
 
@@ -3401,6 +3432,16 @@
       (give-up-ir1-transform))
     'x))
 
+(deftransform logior ((x y) (* (constant-arg t)) *)
+  "fold identity operation"
+  (let* ((y (lvar-value y))
+         (width (or (least-zero-bit (lognot y))
+                    (give-up-ir1-transform)))) ; (logior x 0) handled elsewhere
+    (unless (csubtypep (lvar-type x)
+                       (specifier-type `(integer ,(- (ash 1 width)) -1)))
+      (give-up-ir1-transform))
+    'x))
+
 ;;; Pick off easy association opportunities for constant folding.
 ;;; More complicated stuff that also depends on commutativity
 ;;; (e.g. (f (f x k1) (f y k2)) => (f (f x y) (f k1 k2))) should
@@ -3426,13 +3467,17 @@
                   (splice-fun-args x ',folded 2)
                   `(lambda (x y z)
                      (declare (ignore y z))
-                     (,',operator x ',(,folded y (lvar-value z))))))))
+                     ;; (operator (folded x y) z)
+                     ;; == (operator x (folded z y))
+                     (,',operator x ',(,folded (lvar-value z) y)))))))
   (def logand)
   (def logior)
   (def logxor)
   (def logtest :folded logand)
   (def + :type rational)
-  (def * :type rational))
+  (def + :type rational :folded -)
+  (def * :type rational)
+  (def * :type rational :folded /))
 
 (deftransform mask-signed-field ((width x) ((constant-arg unsigned-byte) *))
   "Fold mask-signed-field/mask-signed-field of constant width"
@@ -3987,6 +4032,48 @@
         `(values (the real ,arg0))
         `(let ((minrest (min ,@rest)))
           (if (<= ,arg0 minrest) ,arg0 minrest)))))
+
+;;; Simplify some cross-type comparisons
+(macrolet ((def (comparator round)
+             `(progn
+                (deftransform ,comparator
+                    ((x y) (rational (constant-arg float)))
+                  "open-code RATIONAL to FLOAT comparison"
+                  (let ((y (lvar-value y)))
+                    #-sb-xc-host
+                    (when (or (float-nan-p y)
+                              (float-infinity-p y))
+                      (give-up-ir1-transform))
+                    (setf y (rational y))
+                    `(,',comparator
+                      x ,(if (csubtypep (lvar-type x)
+                                        (specifier-type 'integer))
+                             (,round y)
+                             y))))
+                (deftransform ,comparator
+                    ((x y) (integer (constant-arg ratio)))
+                  "open-code INTEGER to RATIO comparison"
+                  `(,',comparator x ,(,round (lvar-value y)))))))
+  (def < ceiling)
+  (def > floor))
+
+(deftransform = ((x y) (rational (constant-arg float)))
+  "open-code RATIONAL to FLOAT comparison"
+  (let ((y (lvar-value y)))
+    #-sb-xc-host
+    (when (or (float-nan-p y)
+              (float-infinity-p y))
+      (give-up-ir1-transform))
+    (setf y (rational y))
+    (if (and (csubtypep (lvar-type x)
+                        (specifier-type 'integer))
+             (ratiop y))
+        nil
+        `(= x ,y))))
+
+(deftransform = ((x y) (integer (constant-arg ratio)))
+  "constant-fold INTEGER to RATIO comparison"
+  nil)
 \f
 ;;;; converting N-arg arithmetic functions
 ;;;;