X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fx86%2Finsts.lisp;h=4edb1a433ba372ec9e8314acb2ea9bdfe2bb7394;hb=8c564b785ae1dab0f1e04331f47638dde625372b;hp=6ed33adc076b70e590c3ac17b00333112ffccdc6;hpb=2230ea0c1765a95fd2aa0a8996b3555b93ba3745;p=sbcl.git

diff --git a/src/compiler/x86/insts.lisp b/src/compiler/x86/insts.lisp
index 6ed33ad..4edb1a4 100644
--- a/src/compiler/x86/insts.lisp
+++ b/src/compiler/x86/insts.lisp
@@ -608,6 +608,13 @@
   ;; optional fields
   (imm))
 
+;;; reg-no-width with #x0f prefix
+(sb!disassem:define-instruction-format (ext-reg-no-width 16
+                                        :default-printer '(:name :tab reg))
+  (prefix  :field (byte 8 0)    :value #b00001111)
+  (op    :field (byte 5 11))
+  (reg   :field (byte 3 8) :type 'reg))
+
 ;;; Same as reg/mem, but with a prefix of #b00001111
 (sb!disassem:define-instruction-format (ext-reg/mem 24
                                         :default-printer '(:name :tab reg/mem))
@@ -1593,6 +1600,12 @@
    (emit-byte segment #b11010100)
    (emit-byte segment #b00001010)))
 
+(define-instruction bswap (segment dst)
+  (:printer ext-reg-no-width ((op #b11001)))
+  (:emitter
+   (emit-byte segment #x0f)
+   (emit-byte-with-reg segment #b11001 (reg-tn-encoding dst))))
+
 ;;; CBW -- Convert Byte to Word. AX <- sign_xtnd(AL)
 (define-instruction cbw (segment)
   (:printer two-bytes ((op '(#b01100110 #b10011000))))
@@ -2642,9 +2655,8 @@
 (define-instruction fxch (segment source)
   (:printer floating-point-fp ((op '(#b001 #b001))))
   (:emitter
-    (unless (and (tn-p source)
-                 (eq (sb-name (sc-sb (tn-sc source))) 'float-registers))
-      (cl:break))
+    (aver (and (tn-p source)
+               (eq (sb-name (sc-sb (tn-sc source))) 'float-registers)))
     (emit-byte segment #b11011001)
     (emit-fp-op segment source #b001)))