X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=OPTIMIZATIONS;h=df2c49b7bba4973ff87a3cf09f57cd39ce44fe49;hb=ef8086e0ef5ae4df06f1e9ef250465ac8284bd47;hp=a89eb5a6830e90fb1661e359a82c9be22e723544;hpb=ed85afcccb1d054691bcc7ed2242ad0257d251a0;p=sbcl.git

diff --git a/OPTIMIZATIONS b/OPTIMIZATIONS
index a89eb5a..df2c49b 100644
--- a/OPTIMIZATIONS
+++ b/OPTIMIZATIONS
@@ -80,7 +80,6 @@ uses generic arithmetic
   memory location for iteration variable
 
 ;;; -*- mode: lisp -*-
-;;; $Id$
 ;;; http://www.bagley.org/~doug/shootout/
 ;;; from Friedrich Dominicus
 
@@ -128,7 +127,7 @@ The initial binding is effectless, and without it X is of type
 DOUBLE-FLOAT. Unhopefully, IR1 does not optimize away effectless
 SETs/bindings, and IR2 does not perform type inference.
 --------------------------------------------------------------------------------
-#9
+#9 "Multi-path constant folding"
 (defun foo (x)
   (if (= (cond ((irgh x) 0)
                ((buh x) 1)
@@ -144,8 +143,22 @@ This code could be optimized to
         ((buh x) :no)
         (t :no)))
 --------------------------------------------------------------------------------
-#10
-Reported by Robert E. Brown on sbcl-devel 2003-01-21:
+#11
+(inverted variant of #9)
 
-(this is really a bug, fixed in 0.pre8.26)
+(lambda (x)
+  (let ((y (sap-alien x c-string)))
+    (list (alien-sap y)
+          (alien-sap y))))
+
+It could be optimized to
+
+(lambda (x) (list x x))
+
+(if Y were used only once, the current compiler would optimize it)
+--------------------------------------------------------------------------------
+#12
+(typep (truly-the (simple-array * (*)) x) 'simple-vector)
+
+tests lowtag.
 --------------------------------------------------------------------------------