Index: lib/Target/X86/X86FastISel.cpp
===================================================================
--- lib/Target/X86/X86FastISel.cpp
+++ lib/Target/X86/X86FastISel.cpp
@@ -3271,7 +3271,7 @@
   X86AddressMode AM;
   if (!X86SelectAddress(C, AM))
     return 0;
-  unsigned Opc = Subtarget->is64Bit() ? X86::LEA64r : X86::LEA32r;
+  unsigned Opc = TLI.getPointerTy() == MVT::i32 ? X86::LEA32r : X86::LEA64r;
   const TargetRegisterClass* RC = TLI.getRegClassFor(TLI.getPointerTy());
   unsigned ResultReg = createResultReg(RC);
   addFullAddress(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
Index: test/CodeGen/X86/fast-isel-x32.ll
===================================================================
--- /dev/null
+++ test/CodeGen/X86/fast-isel-x32.ll
@@ -0,0 +1,14 @@
+; RUN: llc < %s -mtriple=x86_64-linux-gnux32 -fast-isel -fast-isel-abort -regalloc=fast | FileCheck %s
+; RUN: llc < %s -mtriple=x86_64-nacl -fast-isel -fast-isel-abort -regalloc=fast | FileCheck %s
+
+; Test that alloca addresses are materialized with the right size instruction.
+
+declare void @bar(i32* %arg)
+
+; CHECK-LABEL: @foo
+define void @foo() {
+  %a = alloca i32
+; CHECK: leal {{.*}}, %edi
+  call void @bar(i32* %a)
+  ret void
+}
Index: test/CodeGen/X86/fast-isel-x86-64.ll
===================================================================
--- test/CodeGen/X86/fast-isel-x86-64.ll
+++ test/CodeGen/X86/fast-isel-x86-64.ll
@@ -302,3 +302,13 @@
 }
 
 declare i8* @foo23()
+
+declare void @takesi32ptr(i32* %arg)
+
+; CHECK-LABEL: allocamaterialize
+define void @allocamaterialize() {
+  %a = alloca i32
+; CHECK: leaq {{.*}}, %rdi
+  call void @takesi32ptr(i32* %a)
+  ret void
+}