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-rw-r--r--llvm/lib/Target/AMDGPU/SIISelLowering.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
index 83ee856b4fe..7243b813d62 100644
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -4487,6 +4487,10 @@ void SITargetLowering::adjustWritemask(MachineSDNode *&Node,
for (SDNode::use_iterator I = Node->use_begin(), E = Node->use_end();
I != E; ++I) {
+ // Don't look at users of the chain.
+ if (I.getUse().getResNo() != 0)
+ continue;
+
// Abort if we can't understand the usage
if (!I->isMachineOpcode() ||
I->getMachineOpcode() != TargetOpcode::EXTRACT_SUBREG)
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