New function: SB-EXT:SPIN-LOOP-HINT

[sbcl.git] / src / compiler / x86 / system.lisp

diff --git a/src/compiler/x86/system.lisp b/src/compiler/x86/system.lisp
index c00907e..2128d2b 100644 (file)
--- a/src/compiler/x86/system.lisp
+++ b/src/compiler/x86/system.lisp
@@ -44,7 +44,7 @@
     (inst jmp :ne done)
 
     ;; Pick off fixnums.
-    (inst and al-tn 3)
+    (inst and al-tn fixnum-tag-mask)
     (inst jmp :e done)
 
     ;; must be an other immediate
@@ -142,7 +142,7 @@
   (:results (res :scs (any-reg descriptor-reg) :from (:argument 0)))
   (:generator 2
     (move res val)
-    (inst shl res (- n-widetag-bits 2))
+    (inst shl res (- n-widetag-bits n-fixnum-tag-bits))
     (inst or res (sc-case type
                    (unsigned-reg type)
                    (immediate (tn-value type))))))
@@ -352,3 +352,42 @@ number of CPU cycles elapsed as secondary value. EXPERIMENTAL."
   (:info index)
   (:generator 0
     (inst inc (make-ea-for-vector-data count-vector :offset index))))
+\f
+;;;; Memory barrier support
+
+#!+memory-barrier-vops
+(define-vop (%compiler-barrier)
+  (:policy :fast-safe)
+  (:translate %compiler-barrier)
+  (:generator 3))
+
+#!+memory-barrier-vops
+(define-vop (%memory-barrier)
+  (:policy :fast-safe)
+  (:translate %memory-barrier)
+  (:generator 3
+    (inst add (make-ea :dword :base esp-tn) 0 :lock)))
+
+#!+memory-barrier-vops
+(define-vop (%read-barrier)
+  (:policy :fast-safe)
+  (:translate %read-barrier)
+  (:generator 3))
+
+#!+memory-barrier-vops
+(define-vop (%write-barrier)
+  (:policy :fast-safe)
+  (:translate %write-barrier)
+  (:generator 3))
+
+#!+memory-barrier-vops
+(define-vop (%data-dependency-barrier)
+  (:policy :fast-safe)
+  (:translate %data-dependency-barrier)
+  (:generator 3))
+
+(define-vop (pause)
+  (:translate spin-loop-hint)
+  (:policy :fast-safe)
+  (:generator 0
+    (inst pause)))