X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fgeneric%2Futils.lisp;h=d4192d316f3e720fc4efdcc204d7e1cc47a2c182;hb=19319c931fc1636835dbef71808cc10e252bcf45;hp=7095f61f079ace77542c03953145b703b9fbec5c;hpb=f1ffbf976aaa50b7b22f126b97e34afe06a91210;p=sbcl.git

diff --git a/src/compiler/generic/utils.lisp b/src/compiler/generic/utils.lisp
index 7095f61..d4192d3 100644
--- a/src/compiler/generic/utils.lisp
+++ b/src/compiler/generic/utils.lisp
@@ -15,8 +15,18 @@
 ;;; Make a fixnum out of NUM. (I.e. shift by two bits if it will fit.)
 (defun fixnumize (num)
   (if (fixnump num)
-      (ash num (1- n-lowtag-bits))
+      (ash num n-fixnum-tag-bits)
       (error "~W is too big for a fixnum." num)))
+
+;;; Determining whether a constant offset fits in an addressing mode.
+#!+(or x86 x86-64)
+(defun foldable-constant-offset-p (element-size lowtag data-offset offset)
+  (if (< element-size n-byte-bits)
+      nil
+      (multiple-value-bind (min max)
+          (sb!impl::displacement-bounds lowtag element-size data-offset)
+        (<= min offset max))))
+
 
 ;;;; routines for dealing with static symbols
 
@@ -49,7 +59,7 @@
 
 ;;; Return the (byte) offset from NIL to the start of the fdefn object
 ;;; for the static function NAME.
-(defun static-fun-offset (name)
+(defun static-fdefn-offset (name)
   (let ((static-syms (length *static-symbols*))
         (static-fun-index (position name *static-funs*)))
     (unless static-fun-index
@@ -58,7 +68,14 @@
        (pad-data-block (1- symbol-size))
        (- list-pointer-lowtag)
        (* static-fun-index (pad-data-block fdefn-size))
-       (* fdefn-raw-addr-slot n-word-bytes))))
+       other-pointer-lowtag)))
+
+;;; Return the (byte) offset from NIL to the raw-addr slot of the
+;;; fdefn object for the static function NAME.
+(defun static-fun-offset (name)
+  (+ (static-fdefn-offset name)
+     (- other-pointer-lowtag)
+     (* fdefn-raw-addr-slot n-word-bytes)))
 
 ;;; Various error-code generating helpers
 (defvar *adjustable-vectors* nil)