Index: llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
===================================================================
--- llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -461,9 +461,12 @@
   ArrayRef<uint64_t> Offsets = *VMap.getOffsets(LI);
   unsigned Base = getOrCreateVReg(*LI.getPointerOperand());
 
+  Type *OffsetIRTy = DL->getIntPtrType(LI.getPointerOperandType());
+  LLT OffsetTy = getLLTForType(*OffsetIRTy, *DL);
+
   for (unsigned i = 0; i < Regs.size(); ++i) {
     unsigned Addr = 0;
-    MIRBuilder.materializeGEP(Addr, Base, LLT::scalar(64), Offsets[i] / 8);
+    MIRBuilder.materializeGEP(Addr, Base, OffsetTy, Offsets[i] / 8);
 
     MachinePointerInfo Ptr(LI.getPointerOperand(), Offsets[i] / 8);
     unsigned BaseAlign = getMemOpAlignment(LI);
@@ -490,9 +493,12 @@
   ArrayRef<uint64_t> Offsets = *VMap.getOffsets(*SI.getValueOperand());
   unsigned Base = getOrCreateVReg(*SI.getPointerOperand());
 
+  Type *OffsetIRTy = DL->getIntPtrType(SI.getPointerOperandType());
+  LLT OffsetTy = getLLTForType(*OffsetIRTy, *DL);
+
   for (unsigned i = 0; i < Vals.size(); ++i) {
     unsigned Addr = 0;
-    MIRBuilder.materializeGEP(Addr, Base, LLT::scalar(64), Offsets[i] / 8);
+    MIRBuilder.materializeGEP(Addr, Base, OffsetTy, Offsets[i] / 8);
 
     MachinePointerInfo Ptr(SI.getPointerOperand(), Offsets[i] / 8);
     unsigned BaseAlign = getMemOpAlignment(SI);
Index: llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
===================================================================
--- llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
+++ llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
@@ -544,3 +544,20 @@
   %elt = extractelement <2 x i32> %vec, i32 0
   ret i32 %elt
 }
+
+define void @test_load_store_struct({i32, i32} *%addr) {
+; Make sure the IRTranslator doesn't use an unnecessarily large GEP index type
+; when breaking up loads and stores of aggregates.
+; CHECK-LABEL: name: test_load_store_struct
+; CHECK: [[ADDR1:%[0-9]+]]:_(p0) = COPY $r0
+; CHECK-DAG: [[VAL1:%[0-9]+]]:_(s32) = G_LOAD [[ADDR1]](p0) :: (load 4 from %ir.addr)
+; CHECK-DAG: [[OFFSET:%[0-9]+]]:_(s32) = G_CONSTANT i32 4
+; CHECK-DAG: [[ADDR2:%[0-9]+]]:_(p0) = G_GEP [[ADDR1]], [[OFFSET]](s32)
+; CHECK-DAG: [[VAL2:%[0-9]+]]:_(s32) = G_LOAD [[ADDR2]](p0) :: (load 4 from %ir.addr + 4)
+; CHECK-DAG: G_STORE [[VAL1]](s32), [[ADDR1]](p0) :: (store 4 into %ir.addr)
+; CHECK-DAG: [[ADDR2:%[0-9]+]]:_(p0) = G_GEP [[ADDR1]], [[OFFSET]](s32)
+; CHECK-DAG: G_STORE [[VAL2]](s32), [[ADDR2]](p0) :: (store 4 into %ir.addr + 4)
+  %val = load {i32, i32}, {i32, i32} *%addr, align 4
+  store {i32, i32} %val, {i32, i32} *%addr, align 4
+  ret void
+}