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diff --git a/test/CodeGen/X86/2013-10-14-FastISel-incorrect-vreg.ll b/test/CodeGen/X86/2013-10-14-FastISel-incorrect-vreg.ll
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+; RUN: llc -mtriple x86_64-apple-darwin -O0 < %s -o - | FileCheck %s
+;
+; During X86 fastisel, the address of indirect call was resolved
+; through bitcast, ptrtoint, and inttoptr instructions. This is valid
+; only if the related instructions are in that same basic block, otherwise
+; we may reference variables that were not live accross basic blocks
+; resulting in undefined virtual registers.
+;
+; In this example, this is illustrated by a the spill/reload of the
+; LOADED_PTR_SLOT.
+;
+; Before this patch, the compiler was accessing two different spill
+; slots.
+; <rdar://problem/15192473>
+
+; CHECK-LABEL: @test_bitcast
+; Load the value of the function pointer: %loaded_ptr
+; CHECK: movq (%rdi), [[LOADED_PTR:%[a-z]+]]
+; Spill %arg2.
+; CHECK: movq %rdx, [[ARG2_SLOT:[0-9]*\(%[a-z]+\)]]
+; Spill %loaded_ptr.
+; CHECK: movq [[LOADED_PTR]], [[LOADED_PTR_SLOT:[0-9]*\(%[a-z]+\)]]
+; Perform the indirect call.
+; Load the first argument
+; CHECK: movq [[ARG2_SLOT]], %rdi
+; Load the second argument
+; CHECK: movq [[ARG2_SLOT]], %rsi
+; Load the thrid argument
+; CHECK: movq [[ARG2_SLOT]], %rdx
+; Load the function pointer.
+; CHECK: movq [[LOADED_PTR_SLOT]], [[FCT_PTR:%[a-z]+]]
+; Call.
+; CHECK: callq *[[FCT_PTR]]
+; CHECK: ret
+define i64 @test_bitcast(i64 (i64, i64, i64)** %arg, i1 %bool, i64 %arg2) {
+entry:
+  %loaded_ptr = load i64 (i64, i64, i64)** %arg, align 8
+  %raw = bitcast i64 (i64, i64, i64)* %loaded_ptr to i8*
+  switch i1 %bool, label %default [
+    i1 true, label %label_true
+    i1 false, label %label_end
+  ]
+default:
+  unreachable
+
+label_true:
+  br label %label_end
+
+label_end:
+  %fct_ptr = bitcast i8* %raw to i64 (i64, i64, i64)*
+  %res = call i64 %fct_ptr(i64 %arg2, i64 %arg2, i64 %arg2)
+  ret i64 %res
+}
+
+; CHECK-LABEL: @test_inttoptr
+; Load the value of the function pointer: %loaded_ptr
+; CHECK: movq (%rdi), [[LOADED_PTR:%[a-z]+]]
+; Spill %arg2.
+; CHECK: movq %rdx, [[ARG2_SLOT:[0-9]*\(%[a-z]+\)]]
+; Spill %loaded_ptr.
+; CHECK: movq [[LOADED_PTR]], [[LOADED_PTR_SLOT:[0-9]*\(%[a-z]+\)]]
+; Perform the indirect call.
+; Load the first argument
+; CHECK: movq [[ARG2_SLOT]], %rdi
+; Load the second argument
+; CHECK: movq [[ARG2_SLOT]], %rsi
+; Load the thrid argument
+; CHECK: movq [[ARG2_SLOT]], %rdx
+; Load the function pointer.
+; CHECK: movq [[LOADED_PTR_SLOT]], [[FCT_PTR:%[a-z]+]]
+; Call.
+; CHECK: callq *[[FCT_PTR]]
+; CHECK: ret
+define i64 @test_inttoptr(i64 (i64, i64, i64)** %arg, i1 %bool, i64 %arg2) {
+entry:
+  %loaded_ptr = load i64 (i64, i64, i64)** %arg, align 8
+  %raw = ptrtoint i64 (i64, i64, i64)* %loaded_ptr to i64
+  switch i1 %bool, label %default [
+    i1 true, label %label_true
+    i1 false, label %label_end
+  ]
+default:
+  unreachable
+
+label_true:
+  br label %label_end
+
+label_end:
+  %fct_ptr = inttoptr i64 %raw to i64 (i64, i64, i64)*
+  %res = call i64 %fct_ptr(i64 %arg2, i64 %arg2, i64 %arg2)
+  ret i64 %res
+}
+
+; CHECK-LABEL: @test_ptrtoint
+; Load the value of the function pointer: %loaded_ptr
+; CHECK: movq (%rdi), [[LOADED_PTR:%[a-z]+]]
+; Spill %arg2.
+; CHECK: movq %rdx, [[ARG2_SLOT:[0-9]*\(%[a-z]+\)]]
+; Spill %loaded_ptr.
+; CHECK: movq [[LOADED_PTR]], [[LOADED_PTR_SLOT:[0-9]*\(%[a-z]+\)]]
+; Perform the indirect call.
+; Load the first argument
+; CHECK: movq [[ARG2_SLOT]], %rdi
+; Load the second argument
+; CHECK: movq [[ARG2_SLOT]], %rsi
+; Load the thrid argument
+; CHECK: movq [[ARG2_SLOT]], %rdx
+; Load the function pointer.
+; CHECK: movq [[LOADED_PTR_SLOT]], [[FCT_PTR:%[a-z]+]]
+; Call.
+; CHECK: callq *[[FCT_PTR]]
+; CHECK: ret
+define i64 @test_ptrtoint(i64 (i64, i64, i64)** %arg, i1 %bool, i64 %arg2) {
+entry:
+  %loaded_ptr = load i64 (i64, i64, i64)** %arg, align 8
+  %raw = bitcast i64 (i64, i64, i64)* %loaded_ptr to i8*
+  switch i1 %bool, label %default [
+    i1 true, label %label_true
+    i1 false, label %label_end
+  ]
+default:
+  unreachable
+
+label_true:
+  br label %label_end
+
+label_end:
+  %fct_int = ptrtoint i8* %raw to i64
+  %fct_ptr = inttoptr i64 %fct_int to i64 (i64, i64, i64)*
+  %res = call i64 %fct_ptr(i64 %arg2, i64 %arg2, i64 %arg2)
+  ret i64 %res
+}