[Valgrind-developers] vex: r1992 - trunk/priv

[<sv...@va...>]

Author: sewardj
Date: 2010-07-29 08:01:29 +0100 (Thu, 29 Jul 2010)
New Revision: 1992

Log:
x86/amd64 FXTRACT: mimic the Core i5 behaviour when the argument is a
negative NaN.



Modified:
   trunk/priv/guest_generic_x87.c


Modified: trunk/priv/guest_generic_x87.c
===================================================================
--- trunk/priv/guest_generic_x87.c	2010-07-29 05:13:58 UTC (rev 1991)
+++ trunk/priv/guest_generic_x87.c	2010-07-29 07:01:29 UTC (rev 1992)
@@ -453,13 +453,13 @@
    const ULong bit52   = 1ULL << 52;
    const ULong sigMask = bit52 - 1;
 
-   /* Mimic PIII behaviour for special cases. */
+   /* Mimic Core i5 behaviour for special cases. */
    if (arg == posInf)
       return getExp ? posInf : posInf;
    if (arg == negInf)
       return getExp ? posInf : negInf;
    if ((arg & nanMask) == nanMask)
-      return qNan;
+      return qNan | (arg & (1ULL << 63));
    if (arg == posZero)
       return getExp ? negInf : posZero;
    if (arg == negZero)