Changeset 62401 in vbox for trunk/include/iprt

Timestamp:

Jul 21, 2016 1:52:17 PM (9 years ago)

Author:

vboxsync

Message:

Added RTUInt128AssignNeg.

File:

• trunk/include/iprt/uint128.h (modified) (1 diff)

trunk/include/iprt/uint128.h

@@ -644 +644 @@
         pValue1Result->s.Hi--;
     pValue1Result->s.Hi -= pValue2->s.Hi;
+    return pValue1Result;
+}
+
+
+/**
+ * Negates a 128 number, storing the result in the input.
+ *
+ * @returns pValueResult.
+ * @param   pValueResult    The value to negate.
+ */
+DECLINLINE(PRTUINT128U) RTUInt128AssignNeg(PRTUINT128U pValueResult)
+{
+    /* result = 0 - value */
+    if (pValue1Result->s.Lo != 0)
+    {
+        pValue1Result->s.Lo = UINT64_C(0) - pValue1Result->s.Lo;
+        pValue1Result->s.Hi = UINT64_MAX  - pValue1Result->s.Hi;
+    }
+    else
+        pValue1Result->s.Hi = UINT64_C(0) - pValue1Result->s.Hi;
     return pValue1Result;
 }