X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fx86-64%2Fcall.lisp;h=8e1da4d173148ad00f287defc52a498fa66137d2;hb=068cf4b55af3f8f8acf2c7c06869441612261cd4;hp=da925b36c1ad66fc2dd45218fd45467c80e31482;hpb=462b946eaf95cdba2648a67ad2bc3b06b7c7a4f2;p=sbcl.git

diff --git a/src/compiler/x86-64/call.lisp b/src/compiler/x86-64/call.lisp
index da925b3..8e1da4d 100644
--- a/src/compiler/x86-64/call.lisp
+++ b/src/compiler/x86-64/call.lisp
@@ -285,8 +285,7 @@
           (count-okay (gen-label)))
       (note-this-location vop :unknown-return)
       ;; Branch off to the MV case.
-      (inst nop)
-      (inst jmp-short regs-defaulted)
+      (inst jmp :c regs-defaulted)
 
       ;; Default the register args, and set up the stack as if we
       ;; entered the MV return point.
@@ -357,7 +356,8 @@
       ;; Restore EDI, and reset the stack.
       (emit-label restore-edi)
       (loadw rdi-tn rbx-tn (- (1+ 1)))
-      (inst mov rsp-tn rbx-tn))))
+      (inst mov rsp-tn rbx-tn)
+      (inst cld))))
   (values))
 
 ;;;; unknown values receiving
@@ -797,7 +797,7 @@
                                do (noise `(loadw ,name new-fp ,index)))
                               (noise))
                    '((if (zerop nargs)
-                         (inst xor rcx rcx)
+                         (zeroize rcx)
                        (inst mov rcx (fixnumize nargs)))))
                ,@(cond ((eq return :tail)
                         '(;; Python has figured out what frame we should
@@ -1032,7 +1032,7 @@
     ;; Establish the values pointer and values count.
     (move rbx rbp-tn)
     (if (zerop nvals)
-        (inst xor rcx rcx) ; smaller
+        (zeroize rcx) ; smaller
       (inst mov rcx (fixnumize nvals)))
     ;; Restore the frame pointer.
     (move rbp-tn old-fp)
@@ -1156,7 +1156,7 @@
   (:generator 20
     ;; Avoid the copy if there are no more args.
     (cond ((zerop fixed)
-           (inst jecxz JUST-ALLOC-FRAME))
+           (inst jrcxz JUST-ALLOC-FRAME))
           (t
            (inst cmp rcx-tn (fixnumize fixed))
            (inst jmp :be JUST-ALLOC-FRAME)))
@@ -1194,7 +1194,7 @@
     ;; We need to copy from downwards up to avoid overwriting some of
     ;; the yet uncopied args. So we need to use R9 as the copy index
     ;; and RCX as the loop counter, rather than using RCX for both.
-    (inst xor copy-index copy-index)
+    (zeroize copy-index)
 
     ;; We used to use REP MOVS here, but on modern x86 it performs
     ;; much worse than an explicit loop for small blocks.
@@ -1295,8 +1295,8 @@
       (move rcx count)
       ;; Check to see whether there are no args, and just return NIL if so.
       (inst mov result nil-value)
-      (inst jecxz done)
-      (inst lea dst (make-ea :qword :index rcx :scale 2))
+      (inst jrcxz done)
+      (inst lea dst (make-ea :qword :base rcx :index rcx))
       (maybe-pseudo-atomic stack-allocate-p
        (allocation dst dst node stack-allocate-p)
        (inst lea dst (make-ea :byte :base dst :disp list-pointer-lowtag))
@@ -1321,7 +1321,8 @@
        (inst sub rcx 1)
        (inst jmp :nz loop)
        ;; NIL out the last cons.
-       (storew nil-value dst 1 list-pointer-lowtag))
+       (storew nil-value dst 1 list-pointer-lowtag)
+       (inst cld))
       (emit-label done))))
 
 ;;; Return the location and size of the &MORE arg glob created by