Index: lib/Target/AMDGPU/AMDGPUISelLowering.cpp
===================================================================
--- lib/Target/AMDGPU/AMDGPUISelLowering.cpp
+++ lib/Target/AMDGPU/AMDGPUISelLowering.cpp
@@ -1484,7 +1484,7 @@
   if ((Store->getAddressSpace() == AMDGPUAS::LOCAL_ADDRESS ||
        Store->getAddressSpace() == AMDGPUAS::PRIVATE_ADDRESS) &&
       Store->getValue().getValueType().isVector()) {
-    return ScalarizeVectorStore(Op, DAG);
+    return SplitVectorStore(Op, DAG);
   }
 
   EVT MemVT = Store->getMemoryVT();
Index: lib/Target/AMDGPU/SIISelLowering.cpp
===================================================================
--- lib/Target/AMDGPU/SIISelLowering.cpp
+++ lib/Target/AMDGPU/SIISelLowering.cpp
@@ -1183,7 +1183,8 @@
           break;
         // fall-through
       case AMDGPUAS::LOCAL_ADDRESS:
-        return ScalarizeVectorLoad(Op, DAG);
+        // If properly aligned, if we split we might be able to use ds_read_b64.
+        return SplitVectorLoad(Op, DAG);
     }
   }
 
Index: test/CodeGen/AMDGPU/ds_read2_superreg.ll
===================================================================
--- test/CodeGen/AMDGPU/ds_read2_superreg.ll
+++ test/CodeGen/AMDGPU/ds_read2_superreg.ll
@@ -89,8 +89,13 @@
 }
 
 ; CI-LABEL: {{^}}simple_read2_v4f32_superreg_align8:
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_W:[0-9]+]]:[[REG_Z:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:3 offset1:2{{$}}
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_X:[0-9]+]]:[[REG_Y:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:1{{$}}
+; CI-DAG: ds_read2_b64 v{{\[}}[[REG_W:[0-9]+]]:[[REG_Z:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:1{{$}}
+
+; FIXME: These moves shouldn't be necessary, it should be able to
+; store the same register if offset1 was the non-zero offset.
+
+; CI: v_mov_b32
+; CI: v_mov_b32
 ; CI: buffer_store_dwordx4
 ; CI: s_endpgm
 define void @simple_read2_v4f32_superreg_align8(<4 x float> addrspace(1)* %out) #0 {
@@ -103,8 +108,9 @@
 }
 
 ; CI-LABEL: {{^}}simple_read2_v4f32_superreg:
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_W:[0-9]+]]:[[REG_Z:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:3 offset1:2{{$}}
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_X:[0-9]+]]:[[REG_Y:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:1{{$}}
+; CI: ds_read2_b64 v{{\[}}[[REG_W:[0-9]+]]:[[REG_Z:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:1{{$}}
+; CI: v_mov_b32
+; CI: v_mov_b32
 ; CI: buffer_store_dwordx4
 ; CI: s_endpgm
 define void @simple_read2_v4f32_superreg(<4 x float> addrspace(1)* %out) #0 {
@@ -118,13 +124,11 @@
 
 ; FIXME: Extra moves shuffling superregister
 ; CI-LABEL: {{^}}simple_read2_v8f32_superreg:
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT3:[0-9]+]]:[[REG_ELT7:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:3 offset1:7{{$}}
+; CI: ds_read2_b64 v{{\[}}[[REG_ELT3:[0-9]+]]:[[REG_ELT7:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:1 offset1:3{{$}}
 ; CI: v_mov_b32
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT6:[0-9]+]]:[[REG_ELT5:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:2 offset1:1{{$}}
 ; CI: v_mov_b32
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT4:[0-9]+]]:[[REG_ELT2:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:6 offset1:5{{$}}
+; CI: ds_read2_b64 v{{\[}}[[REG_ELT6:[0-9]+]]:[[REG_ELT5:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:2{{$}}
 ; CI: v_mov_b32
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT1:[0-9]+]]:[[REG_ELT0:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:4{{$}}
 ; CI: v_mov_b32
 ; CI: buffer_store_dwordx4
 ; CI: buffer_store_dwordx4
@@ -140,21 +144,15 @@
 
 ; FIXME: Extra moves shuffling superregister
 ; CI-LABEL: {{^}}simple_read2_v16f32_superreg:
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT11:[0-9]+]]:[[REG_ELT15:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:3 offset1:7{{$}}
-; CI: v_mov_b32
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT14:[0-9]+]]:[[REG_ELT13:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:11 offset1:15{{$}}
-; CI: v_mov_b32
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT12:[0-9]+]]:[[REG_ELT10:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:2 offset1:1{{$}}
+; CI: ds_read2_b64 v{{\[}}[[REG_ELT11:[0-9]+]]:[[REG_ELT15:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:3 offset1:5{{$}}
 ; CI: v_mov_b32
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT9:[0-9]+]]:[[REG_ELT8:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:6 offset1:5{{$}}
 ; CI: v_mov_b32
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT7:[0-9]+]]:[[REG_ELT6:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:10 offset1:9{{$}}
+; CI: ds_read2_b64 v{{\[}}[[REG_ELT14:[0-9]+]]:[[REG_ELT13:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:7 offset1:2{{$}}
+; CI: ds_read2_b64 v{{\[}}[[REG_ELT14:[0-9]+]]:[[REG_ELT13:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:6 offset1:4{{$}}
 ; CI: v_mov_b32
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT5:[0-9]+]]:[[REG_ELT4:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:14 offset1:13{{$}}
 ; CI: v_mov_b32
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT3:[0-9]+]]:[[REG_ELT2:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:12 offset1:8{{$}}
+; CI: ds_read2_b64 v{{\[}}[[REG_ELT12:[0-9]+]]:[[REG_ELT10:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:1{{$}}
 ; CI: v_mov_b32
-; CI-DAG: ds_read2_b32 v{{\[}}[[REG_ELT1:[0-9]+]]:[[REG_ELT0:[0-9]+]]{{\]}}, v{{[0-9]+}} offset0:4{{$}}
 ; CI: v_mov_b32
 
 ; CI: s_waitcnt lgkmcnt(0)
Index: test/CodeGen/AMDGPU/indirect-private-64.ll
===================================================================
--- test/CodeGen/AMDGPU/indirect-private-64.ll
+++ test/CodeGen/AMDGPU/indirect-private-64.ll
@@ -29,14 +29,10 @@
 ; SI-ALLOCA: buffer_store_dwordx4
 ; SI-ALLOCA: buffer_load_dwordx4
 
-; SI-PROMOTE: ds_write_b32
-; SI-PROMOTE: ds_write_b32
-; SI-PROMOTE: ds_write_b32
-; SI-PROMOTE: ds_write_b32
-; SI-PROMOTE: ds_read_b32
-; SI-PROMOTE: ds_read_b32
-; SI-PROMOTE: ds_read_b32
-; SI-PROMOTE: ds_read_b32
+; SI-PROMOTE: ds_write_b64
+; SI-PROMOTE: ds_write_b64
+; SI-PROMOTE: ds_read_b64
+; SI-PROMOTE: ds_read_b64
 define void @private_access_v2f64_alloca(<2 x double> addrspace(1)* noalias %out, <2 x double> addrspace(1)* noalias %in, i32 %b) nounwind {
   %val = load <2 x double>, <2 x double> addrspace(1)* %in, align 16
   %array = alloca <2 x double>, i32 16, align 16
@@ -71,14 +67,10 @@
 ; SI-ALLOCA: buffer_store_dwordx4
 ; SI-ALLOCA: buffer_load_dwordx4
 
-; SI-PROMOTE: ds_write_b32
-; SI-PROMOTE: ds_write_b32
-; SI-PROMOTE: ds_write_b32
-; SI-PROMOTE: ds_write_b32
-; SI-PROMOTE: ds_read_b32
-; SI-PROMOTE: ds_read_b32
-; SI-PROMOTE: ds_read_b32
-; SI-PROMOTE: ds_read_b32
+; SI-PROMOTE: ds_write_b64
+; SI-PROMOTE: ds_write_b64
+; SI-PROMOTE: ds_read_b64
+; SI-PROMOTE: ds_read_b64
 define void @private_access_v2i64_alloca(<2 x i64> addrspace(1)* noalias %out, <2 x i64> addrspace(1)* noalias %in, i32 %b) nounwind {
   %val = load <2 x i64>, <2 x i64> addrspace(1)* %in, align 16
   %array = alloca <2 x i64>, i32 16, align 16
Index: test/CodeGen/AMDGPU/llvm.memcpy.ll
===================================================================
--- test/CodeGen/AMDGPU/llvm.memcpy.ll
+++ test/CodeGen/AMDGPU/llvm.memcpy.ll
@@ -132,32 +132,15 @@
 }
 
 ; FUNC-LABEL: {{^}}test_small_memcpy_i64_lds_to_lds_align4:
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
+; SI: ds_read2_b32
+; SI: ds_read2_b32
+; SI: ds_read2_b32
+; SI: ds_read2_b32
 
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
+; SI: ds_write2_b32
+; SI: ds_write2_b32
+; SI: ds_write2_b32
+; SI: ds_write2_b32
 
 ; SI: s_endpgm
 define void @test_small_memcpy_i64_lds_to_lds_align4(i64 addrspace(3)* noalias %out, i64 addrspace(3)* noalias %in) nounwind {
@@ -170,32 +153,15 @@
 ; FIXME: Use 64-bit ops
 ; FUNC-LABEL: {{^}}test_small_memcpy_i64_lds_to_lds_align8:
 
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
-
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
+; SI: ds_read_b64
+; SI: ds_read_b64
+; SI: ds_read_b64
+; SI: ds_read_b64
 
-; SI-DAG: ds_read_b32
-; SI-DAG: ds_write_b32
+; SI: ds_write_b64
+; SI: ds_write_b64
+; SI: ds_write_b64
+; SI: ds_write_b64
 
 ; SI-DAG: s_endpgm
 define void @test_small_memcpy_i64_lds_to_lds_align8(i64 addrspace(3)* noalias %out, i64 addrspace(3)* noalias %in) nounwind {
Index: test/CodeGen/AMDGPU/merge-stores.ll
===================================================================
--- test/CodeGen/AMDGPU/merge-stores.ll
+++ test/CodeGen/AMDGPU/merge-stores.ll
@@ -539,10 +539,15 @@
 }
 
 ; GCN-LABEL: {{^}}merge_local_store_4_constants_i32:
-; GCN: ds_write_b32
-; GCN: ds_write_b32
-; GCN: ds_write_b32
-; GCN: ds_write_b32
+; GCN-DAG: v_mov_b32_e32 [[K2:v[0-9]+]], 0x1c8
+; GCN-DAG: v_mov_b32_e32 [[K3:v[0-9]+]], 0x14d
+; GCN-DAG: ds_write2_b32 v{{[0-9]+}}, [[K2]], [[K3]] offset0:2 offset1:3
+
+; GCN-DAG: v_mov_b32_e32 [[K0:v[0-9]+]], 0x4d2
+; GCN-DAG: v_mov_b32_e32 [[K1:v[0-9]+]], 0x7b
+; GCN-DAG: ds_write2_b32 v{{[0-9]+}}, [[K0]], [[K1]] offset1:1
+
+; GCN: s_endpgm
 define void @merge_local_store_4_constants_i32(i32 addrspace(3)* %out) #0 {
   %out.gep.1 = getelementptr i32, i32 addrspace(3)* %out, i32 1
   %out.gep.2 = getelementptr i32, i32 addrspace(3)* %out, i32 2
Index: test/CodeGen/AMDGPU/store.ll
===================================================================
--- test/CodeGen/AMDGPU/store.ll
+++ test/CodeGen/AMDGPU/store.ll
@@ -287,16 +287,33 @@
 ; CM: LDS_WRITE
 ; CM: LDS_WRITE
 
-; SI: ds_write_b32
-; SI: ds_write_b32
-; SI: ds_write_b32
-; SI: ds_write_b32
+; SI: ds_write_b64
+; SI: ds_write_b64
 define void @store_local_v4i32(<4 x i32> addrspace(3)* %out, <4 x i32> %in) {
 entry:
   store <4 x i32> %in, <4 x i32> addrspace(3)* %out
   ret void
 }
 
+; FUNC-LABEL: {{^}}store_local_v4i32_align4:
+; EG: LDS_WRITE
+; EG: LDS_WRITE
+; EG: LDS_WRITE
+; EG: LDS_WRITE
+
+; CM: LDS_WRITE
+; CM: LDS_WRITE
+; CM: LDS_WRITE
+; CM: LDS_WRITE
+
+; SI: ds_write2_b32
+; SI: ds_write2_b32
+define void @store_local_v4i32_align4(<4 x i32> addrspace(3)* %out, <4 x i32> %in) {
+entry:
+  store <4 x i32> %in, <4 x i32> addrspace(3)* %out, align 4
+  ret void
+}
+
 ; FUNC-LABEL: {{^}}store_local_i64_i8:
 ; EG: LDS_BYTE_WRITE
 ; SI: ds_write_b8