Changeset 10849 in vbox

Timestamp:

Jul 24, 2008 9:13:53 AM (17 years ago)

Author:

vboxsync

Message:

32 bits build fix

File:

• trunk/src/VBox/VMM/VMMR0/HWACCMR0A.asm (modified) (1 diff)

trunk/src/VBox/VMM/VMMR0/HWACCMR0A.asm

@@ -1093 +1093 @@
     mov     ecx, esi
  %else
-    movzx   rax, ecx
+    ; from http://www.cs.cmu.edu/~fp/courses/15213-s06/misc/asm64-handout.pdf:
+    ; ``Perhaps unexpectedly, instructions that move or generate 32-bit register
+    ;   values also set the upper 32 bits of the register to zero. Consequently
+    ;   there is no need for an instruction movzlq.''
+    mov     eax, ecx
     mov     ecx, edx
  %endif