Index: lib/Target/AMDGPU/SIISelLowering.cpp
===================================================================
--- lib/Target/AMDGPU/SIISelLowering.cpp
+++ lib/Target/AMDGPU/SIISelLowering.cpp
@@ -4486,6 +4486,10 @@
   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)
Index: test/CodeGen/AMDGPU/llvm.amdgcn.image.sample.ll
===================================================================
--- test/CodeGen/AMDGPU/llvm.amdgcn.image.sample.ll
+++ test/CodeGen/AMDGPU/llvm.amdgcn.image.sample.ll
@@ -199,6 +199,92 @@
   ret void
 }
 
+; GCN-LABEL: {{^}}adjust_writemask_sample_0:
+; GCN: image_sample v{{[0-9]+}}, v{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}} dmask:0x1{{$}}
+define void @adjust_writemask_sample_0(float addrspace(1)* %out) {
+main_body:
+  %r = call <4 x float> @llvm.amdgcn.image.sample.v4f32.v4f32.v8i32(<4 x float> undef, <8 x i32> undef, <4 x i32> undef, i32 15, i1 0, i1 0, i1 0, i1 0, i1 0)
+  %elt0 = extractelement <4 x float> %r, i32 0
+  store float %elt0, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}adjust_writemask_sample_01:
+; GCN: image_sample v{{\[[0-9]+:[0-9]+\]}}, v{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}} dmask:0x3{{$}}
+define void @adjust_writemask_sample_01(float addrspace(1)* %out) {
+main_body:
+  %r = call <4 x float> @llvm.amdgcn.image.sample.v4f32.v4f32.v8i32(<4 x float> undef, <8 x i32> undef, <4 x i32> undef, i32 15, i1 0, i1 0, i1 0, i1 0, i1 0)
+  %elt0 = extractelement <4 x float> %r, i32 0
+  %elt1 = extractelement <4 x float> %r, i32 1
+  store volatile float %elt0, float addrspace(1)* %out
+  store volatile float %elt1, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}adjust_writemask_sample_012:
+; GCN: image_sample v{{\[[0-9]+:[0-9]+\]}}, v{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}} dmask:0x7{{$}}
+define void @adjust_writemask_sample_012(float addrspace(1)* %out) {
+main_body:
+  %r = call <4 x float> @llvm.amdgcn.image.sample.v4f32.v4f32.v8i32(<4 x float> undef, <8 x i32> undef, <4 x i32> undef, i32 15, i1 0, i1 0, i1 0, i1 0, i1 0)
+  %elt0 = extractelement <4 x float> %r, i32 0
+  %elt1 = extractelement <4 x float> %r, i32 1
+  %elt2 = extractelement <4 x float> %r, i32 2
+  store volatile float %elt0, float addrspace(1)* %out
+  store volatile float %elt1, float addrspace(1)* %out
+  store volatile float %elt2, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}adjust_writemask_sample_12:
+; GCN: image_sample v{{\[[0-9]+:[0-9]+\]}}, v{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}} dmask:0x6{{$}}
+define void @adjust_writemask_sample_12(float addrspace(1)* %out) {
+main_body:
+  %r = call <4 x float> @llvm.amdgcn.image.sample.v4f32.v4f32.v8i32(<4 x float> undef, <8 x i32> undef, <4 x i32> undef, i32 15, i1 0, i1 0, i1 0, i1 0, i1 0)
+  %elt1 = extractelement <4 x float> %r, i32 1
+  %elt2 = extractelement <4 x float> %r, i32 2
+  store volatile float %elt1, float addrspace(1)* %out
+  store volatile float %elt2, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}adjust_writemask_sample_03:
+; GCN: image_sample v{{\[[0-9]+:[0-9]+\]}}, v{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}} dmask:0x9{{$}}
+define void @adjust_writemask_sample_03(float addrspace(1)* %out) {
+main_body:
+  %r = call <4 x float> @llvm.amdgcn.image.sample.v4f32.v4f32.v8i32(<4 x float> undef, <8 x i32> undef, <4 x i32> undef, i32 15, i1 0, i1 0, i1 0, i1 0, i1 0)
+  %elt0 = extractelement <4 x float> %r, i32 0
+  %elt3 = extractelement <4 x float> %r, i32 3
+  store volatile float %elt0, float addrspace(1)* %out
+  store volatile float %elt3, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}adjust_writemask_sample_13:
+; GCN: image_sample v{{\[[0-9]+:[0-9]+\]}}, v{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}} dmask:0xa{{$}}
+define void @adjust_writemask_sample_13(float addrspace(1)* %out) {
+main_body:
+  %r = call <4 x float> @llvm.amdgcn.image.sample.v4f32.v4f32.v8i32(<4 x float> undef, <8 x i32> undef, <4 x i32> undef, i32 15, i1 0, i1 0, i1 0, i1 0, i1 0)
+  %elt1 = extractelement <4 x float> %r, i32 1
+  %elt3 = extractelement <4 x float> %r, i32 3
+  store volatile float %elt1, float addrspace(1)* %out
+  store volatile float %elt3, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}adjust_writemask_sample_123:
+; GCN: image_sample v{{\[[0-9]+:[0-9]+\]}}, v{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}}, s{{\[[0-9]+:[0-9]+\]}} dmask:0xe{{$}}
+define void @adjust_writemask_sample_123(float addrspace(1)* %out) {
+main_body:
+  %r = call <4 x float> @llvm.amdgcn.image.sample.v4f32.v4f32.v8i32(<4 x float> undef, <8 x i32> undef, <4 x i32> undef, i32 15, i1 0, i1 0, i1 0, i1 0, i1 0)
+  %elt1 = extractelement <4 x float> %r, i32 1
+  %elt2 = extractelement <4 x float> %r, i32 2
+  %elt3 = extractelement <4 x float> %r, i32 3
+  store volatile float %elt1, float addrspace(1)* %out
+  store volatile float %elt2, float addrspace(1)* %out
+  store volatile float %elt3, float addrspace(1)* %out
+  ret void
+}
+
 declare <4 x float> @llvm.amdgcn.image.sample.v4f32.v4f32.v8i32(<4 x float>, <8 x i32>, <4 x i32>, i32, i1, i1, i1, i1, i1) #0
 declare <4 x float> @llvm.amdgcn.image.sample.cl.v4f32.v4f32.v8i32(<4 x float>, <8 x i32>, <4 x i32>, i32, i1, i1, i1, i1, i1) #0
 declare <4 x float> @llvm.amdgcn.image.sample.d.v4f32.v4f32.v8i32(<4 x float>, <8 x i32>, <4 x i32>, i32, i1, i1, i1, i1, i1) #0