Changeset 6385 in vbox

Timestamp:

Jan 18, 2008 9:40:08 PM (17 years ago)

Author:

vboxsync

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

27331

Message:

small optimization

File:

• trunk/include/iprt/asm.h (modified) (4 diffs)

trunk/include/iprt/asm.h

@@ -2490 +2490 @@
 # if RT_INLINE_ASM_USES_INTRIN
     u32 = _InterlockedIncrement((long *)pu32);
+    return u32;
 
 # elif RT_INLINE_ASM_GNU_STYLE
     __asm__ __volatile__("lock; xaddl %0, %1\n\t"
-                         "incl %0\n\t"
                          : "=r" (u32),
                            "=m" (*pu32)
                          : "0" (1)
                          : "memory");
+    return u32+1;
 # else
     __asm
@@ -2509 +2510 @@
         lock xadd [edx], eax
 #  endif
-        inc     eax
         mov     u32, eax
     }
-# endif
-    return u32;
+    return u32+1;
+# endif
 }
 #endif
@@ -2544 +2544 @@
 # if RT_INLINE_ASM_USES_INTRIN
     u32 = _InterlockedDecrement((long *)pu32);
+    return u32;
 
 # elif RT_INLINE_ASM_GNU_STYLE
     __asm__ __volatile__("lock; xaddl %0, %1\n\t"
-                         "decl %0\n\t"
                          : "=r" (u32),
                            "=m" (*pu32)
                          : "0" (-1)
                          : "memory");
+    return u32-1;
 # else
     __asm
@@ -2563 +2564 @@
         lock xadd [edx], eax
 #  endif
-        dec     eax
         mov     u32, eax
     }
-# endif
-    return u32;
+    return u32-1;
+# endif
 }
 #endif