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From: <sv...@va...> - 2015-06-30 13:37:53
|
Author: sewardj
Date: Tue Jun 30 14:37:45 2015
New Revision: 3157
Log:
* Fix ubsan failures in mullS64 due to signed integer overflow.
* Take the opportunity to replace 0xFFFFFFFF with a symbolic
constant.
Modified:
trunk/priv/guest_amd64_helpers.c
Modified: trunk/priv/guest_amd64_helpers.c
==============================================================================
--- trunk/priv/guest_amd64_helpers.c (original)
+++ trunk/priv/guest_amd64_helpers.c Tue Jun 30 14:37:45 2015
@@ -79,32 +79,34 @@
static void mullS64 ( Long u, Long v, Long* rHi, Long* rLo )
{
+ const Long halfMask = 0xFFFFFFFFLL;
ULong u0, v0, w0;
Long u1, v1, w1, w2, t;
- u0 = u & 0xFFFFFFFFULL;
+ u0 = u & halfMask;
u1 = u >> 32;
- v0 = v & 0xFFFFFFFFULL;
+ v0 = v & halfMask;
v1 = v >> 32;
w0 = u0 * v0;
t = u1 * v0 + (w0 >> 32);
- w1 = t & 0xFFFFFFFFULL;
+ w1 = t & halfMask;
w2 = t >> 32;
w1 = u0 * v1 + w1;
*rHi = u1 * v1 + w2 + (w1 >> 32);
- *rLo = u * v;
+ *rLo = (Long)((ULong)u * (ULong)v);
}
static void mullU64 ( ULong u, ULong v, ULong* rHi, ULong* rLo )
{
+ const ULong halfMask = 0xFFFFFFFFULL;
ULong u0, v0, w0;
ULong u1, v1, w1,w2,t;
- u0 = u & 0xFFFFFFFFULL;
+ u0 = u & halfMask;
u1 = u >> 32;
- v0 = v & 0xFFFFFFFFULL;
+ v0 = v & halfMask;
v1 = v >> 32;
w0 = u0 * v0;
t = u1 * v0 + (w0 >> 32);
- w1 = t & 0xFFFFFFFFULL;
+ w1 = t & halfMask;
w2 = t >> 32;
w1 = u0 * v1 + w1;
*rHi = u1 * v1 + w2 + (w1 >> 32);
|