commit d1d90974d5239151892742b11dd26cf12055aade

Author: cborntra <cborntra@8f6e269a-dfd6-0310-a8e1-e2731360e62c>

Date:   Thu Feb 5 11:05:10 2015 +0000

    Fix bug 343802. We need to handle one more special case in the spechelper

    git-svn-id: svn://svn.valgrind.org/vex/trunk@3083 8f6e269a-dfd6-0310-a8e1-e2731360e62c

diff --git a/VEX/priv/guest_s390_helpers.c b/VEX/priv/guest_s390_helpers.c

index 78ca2ef..df1f24b 100644

--- a/VEX/priv/guest_s390_helpers.c

+++ b/VEX/priv/guest_s390_helpers.c

@@ -1958,7 +1958,10 @@ guest_s390x_spechelper(const HChar *function_name, IRExpr **args,

             return unop(Iop_1Uto32, binop(Iop_CmpNE64, cc_dep1, mkU64(0)));

          }

          if (cond == 4 || cond == 4 + 1) {

-            return unop(Iop_1Uto32, binop(Iop_CmpLT64S, cc_dep1, mkU64(0)));

+             /* Special case cc_dep < 0. Only check the MSB to avoid bogus

+               memcheck complaints due to gcc magic. Fixes 343802

+             */

+            return unop(Iop_64to32, binop(Iop_Shr64, cc_dep1, mkU8(63)));

          }

          if (cond == 8 + 4 || cond == 8 + 4 + 1) {

             return unop(Iop_1Uto32, binop(Iop_CmpLE64S, cc_dep1, mkU64(0)));