0.9.2.9: thread objects

[sbcl.git] / src / compiler / generic / early-vm.lisp

diff --git a/src/compiler/generic/early-vm.lisp b/src/compiler/generic/early-vm.lisp
index afc7dfc..9b854ea 100644 (file)
--- a/src/compiler/generic/early-vm.lisp
+++ b/src/compiler/generic/early-vm.lisp
@@ -11,12 +11,25 @@
 
 ;;; the number of bits at the low end of a pointer used for type
 ;;; information
-(def!constant n-lowtag-bits #!+x86-64 4 #!-x86-64 3)
+(def!constant n-lowtag-bits
+  (integer-length (1- (/ (* 2 n-word-bits) n-byte-bits))))
 ;;; a mask to extract the low tag bits from a pointer
 (def!constant lowtag-mask (1- (ash 1 n-lowtag-bits)))
 ;;; the exclusive upper bound on the value of the low tag bits from a
 ;;; pointer
 (def!constant lowtag-limit (ash 1 n-lowtag-bits))
+;;; the number of tag bits used for a fixnum
+(def!constant n-fixnum-tag-bits (1- n-lowtag-bits))
+;;; the fixnum tag mask
+(def!constant fixnum-tag-mask (1- (ash 1 n-fixnum-tag-bits)))
+;;; the bit width of positive fixnums
+(def!constant n-positive-fixnum-bits (- n-word-bits n-fixnum-tag-bits 1))
+
+;;; the number of bits to shift between word addresses and byte addresses
+(def!constant word-shift (1- (integer-length (/ n-word-bits n-byte-bits))))
+
+;;; the number of bytes in a word
+(def!constant n-word-bytes (/ n-word-bits n-byte-bits))
 
 ;;; the number of bits used in the header word of a data block to store
 ;;; the type