35 lines
1.2 KiB
Diff
35 lines
1.2 KiB
Diff
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commit 632cb02573da3ff6237d9aeb9acd55c09c2ad317
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Author: philippe <philippe@8f6e269a-dfd6-0310-a8e1-e2731360e62c>
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Date: Tue Jul 12 20:49:05 2016 +0000
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Fix n-i-bz amd64: memcheck false positive with shr %edx
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False positive analysis and fix by Julian.
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Thanks
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git-svn-id: svn://svn.valgrind.org/vex/trunk@3223 8f6e269a-dfd6-0310-a8e1-e2731360e62c
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diff --git a/VEX/priv/guest_amd64_helpers.c b/VEX/priv/guest_amd64_helpers.c
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index ab53e15..3a0a4c6 100644
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--- a/VEX/priv/guest_amd64_helpers.c
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+++ b/VEX/priv/guest_amd64_helpers.c
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@@ -1604,6 +1604,15 @@ IRExpr* guest_amd64_spechelper ( const HChar* function_name,
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mkU64(0)));
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}
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+ /*---------------- SHRL ----------------*/
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+
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+ if (isU64(cc_op, AMD64G_CC_OP_SHRL) && isU64(cond, AMD64CondZ)) {
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+ /* SHRL, then Z --> test dep1 == 0 */
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+ return unop(Iop_1Uto64,
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+ binop(Iop_CmpEQ32, unop(Iop_64to32, cc_dep1),
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+ mkU32(0)));
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+ }
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+
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/*---------------- COPY ----------------*/
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/* This can happen, as a result of amd64 FP compares: "comisd ... ;
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jbe" for example. */
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