26 lines
1.2 KiB
Diff
26 lines
1.2 KiB
Diff
commit d1d90974d5239151892742b11dd26cf12055aade
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Author: cborntra <cborntra@8f6e269a-dfd6-0310-a8e1-e2731360e62c>
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Date: Thu Feb 5 11:05:10 2015 +0000
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Fix bug 343802. We need to handle one more special case in the spechelper
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git-svn-id: svn://svn.valgrind.org/vex/trunk@3083 8f6e269a-dfd6-0310-a8e1-e2731360e62c
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diff --git a/VEX/priv/guest_s390_helpers.c b/VEX/priv/guest_s390_helpers.c
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index 78ca2ef..df1f24b 100644
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--- a/VEX/priv/guest_s390_helpers.c
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+++ b/VEX/priv/guest_s390_helpers.c
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@@ -1958,7 +1958,10 @@ guest_s390x_spechelper(const HChar *function_name, IRExpr **args,
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return unop(Iop_1Uto32, binop(Iop_CmpNE64, cc_dep1, mkU64(0)));
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}
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if (cond == 4 || cond == 4 + 1) {
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- return unop(Iop_1Uto32, binop(Iop_CmpLT64S, cc_dep1, mkU64(0)));
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+ /* Special case cc_dep < 0. Only check the MSB to avoid bogus
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+ memcheck complaints due to gcc magic. Fixes 343802
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+ */
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+ return unop(Iop_64to32, binop(Iop_Shr64, cc_dep1, mkU8(63)));
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}
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if (cond == 8 + 4 || cond == 8 + 4 + 1) {
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return unop(Iop_1Uto32, binop(Iop_CmpLE64S, cc_dep1, mkU64(0)));
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