Changeset 42720 in vbox for trunk

Timestamp:

Aug 9, 2012 5:25:25 PM (12 years ago)

Author:

vboxsync

Message:

IEM: Fixed BSF and BSR bug where they would set the destination register when the source was zero.

File:

• trunk/src/VBox/VMM/VMMAll/IEMAllAImpl.asm (modified) (3 diffs)

trunk/src/VBox/VMM/VMMAll/IEMAllAImpl.asm

@@ -523 +523 @@
         IEM_MAYBE_LOAD_FLAGS           A2, %2, %3
         %1      T0_16, A1_16
+        jz      .unchanged_dst
         mov     [A0], T0_16
+.unchanged_dst:
         IEM_SAVE_FLAGS                 A2, %2, %3
         EPILOGUE_3_ARGS
@@ -532 +534 @@
         IEM_MAYBE_LOAD_FLAGS           A2, %2, %3
         %1      T0_32, A1_32
+        jz      .unchanged_dst
         mov     [A0], T0_32
+.unchanged_dst:
         IEM_SAVE_FLAGS                 A2, %2, %3
         EPILOGUE_3_ARGS
@@ -542 +546 @@
         IEM_MAYBE_LOAD_FLAGS           A2, %2, %3
         %1      T0, A1
+        jz      .unchanged_dst
         mov     [A0], T0
+.unchanged_dst:
         IEM_SAVE_FLAGS                 A2, %2, %3
         EPILOGUE_3_ARGS_EX 8