Changeset 58753 in vbox for trunk/src/VBox/Runtime/common/asm/ASMBitFirstClear.asm

Timestamp:

Nov 18, 2015 8:47:23 PM (9 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

104194

Message:

IPRT: Morphed ASMBitFirstClear.asm into ASMBitFirstSet.asm, and fixing 16-bit return bug.

File:

• trunk/src/VBox/Runtime/common/asm/ASMBitFirstClear.asm (modified) (3 diffs)

trunk/src/VBox/Runtime/common/asm/ASMBitFirstClear.asm

@@ -93 +93 @@
         xor     eax, [edi]              ; eax = NOT [rdi]
 %endif
-        jz      .failed_restore         ; race paranoia
         sub     xDI, xDX
         shl     edi, 3                  ; calc bit offset.
 
-        mov     ecx, 0ffffffffh
         bsf     ecx, eax
+        jz      .failed_restore         ; race paranoia
         add     ecx, edi
         mov     eax, ecx
@@ -105 +104 @@
         pop     xDI
 %if ARCH_BITS == 16
+        mov     edx, eax
+        shr     edx, 16
         leave
 %endif
@@ -114 +115 @@
 .failed_restore:
         pop     xDI
-%if ARCH_BITS == 16
-        mov     edx, eax
-        shr     edx, 16
-        leave
-%endif
-        ret
-
 .failed:
 %if ARCH_BITS != 16