X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=OPTIMIZATIONS;h=7c51f473ac7e0301e123fa41db6094598db835d1;hb=dcf5978d9d33098e868ae6eea28e1b310038c03d;hp=3c3edea60ba46a6f485fa4828c717722c1be7831;hpb=d59fb0b06768732835bf45638fbc04f516b9ae9b;p=sbcl.git

diff --git a/OPTIMIZATIONS b/OPTIMIZATIONS
index 3c3edea..7c51f47 100644
--- a/OPTIMIZATIONS
+++ b/OPTIMIZATIONS
@@ -90,21 +90,14 @@ VOP DATA-VECTOR-SET/SIMPLE-STRING V2!14[EDI] t32[EAX] t30[S2]>t33[CL]
                 (incf x)))))))
    (format t "~A~%" x)))
 --------------------------------------------------------------------------------
-#7
-(defun foo (x)
-  (declare (optimize speed (debug 0)))
-  (if (< x 0) x (foo (1- x))))
-
-SBCL generates a full call of FOO (but CMUCL does not).
---------------------------------------------------------------------------------
 #8
 (defun foo (d)
   (declare (optimize (speed 3) (safety 0) (debug 0)))
   (declare (type (double-float 0d0 1d0) d))
   (loop for i fixnum from 1 to 5
-     for x1 double-float = (sin d) ;;; !!!
-     do (loop for j fixnum from 1 to 4
-             sum x1 double-float)))
+        for x1 double-float = (sin d) ;;; !!!
+        do (loop for j fixnum from 1 to 4
+                 sum x1 double-float)))
 
 Without the marked declaration Python will use boxed representation for X1.
 
@@ -158,3 +151,21 @@ tests lowtag.
 FAST-+/FIXNUM and similar should accept unboxed arguments in interests
 of representation selection. Problem: inter-TN dependencies.
 --------------------------------------------------------------------------------
+#14
+The derived type of (/ (THE (DOUBLE-FLOAT (0D0)) X) (THE (DOUBLE-FLOAT
+1D0) Y)) is (DOUBLE-FLOAT 0.0d0). While it might be reasonable, it is
+better to derive (OR (MEMBER 0.0d0) (DOUBLE-FLOAT (0.0d0))).
+--------------------------------------------------------------------------------
+#15
+On the alpha, the system is reluctant to refer directly to a constant bignum,
+preferring to load a large constant through a slow sequence of instructions,
+then cons up a bignum for it:
+
+(LAMBDA (A)
+  (DECLARE (OPTIMIZE (SAFETY 1) (SPEED 3) (DEBUG 1))
+           (TYPE (INTEGER -10000 10000) A)
+           (IGNORABLE A))
+  (CASE A
+    ((89 125 16) (ASH A (MIN 18 -706)))
+    (T (DPB -3 (BYTE 30 30) -1))))
+--------------------------------------------------------------------------------