diff --git a/test/CodeGen/X86/2012-04-09-TwoAddrPassBug.ll b/test/CodeGen/X86/2012-04-09-TwoAddrPassBug.ll
new file mode 100644
index 00000000000..2d901650887
--- /dev/null
+++ b/test/CodeGen/X86/2012-04-09-TwoAddrPassBug.ll
@@ -0,0 +1,34 @@
+; RUN: llc -O1 -verify-coalescing < %s
+; PR12495
+target datalayout =
+"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.7.0"
+
+define void @func(i8* nocapture) nounwind uwtable ssp align 2 {
+  br i1 undef, label %4, label %2
+
+; <label>:2                                       ; preds = %1                  
+  %3 = tail call double @foo() nounwind
+  br label %4
+
+; <label>:4                                       ; preds = %2, %1              
+  %5 = phi double [ %3, %2 ], [ 0.000000e+00, %1 ]
+  %6 = fsub double %5, undef
+  %7 = fcmp olt double %6, 0.000000e+00
+  %8 = select i1 %7, double 0.000000e+00, double %6
+  %9 = fcmp olt double undef, 0.000000e+00
+  %10 = fcmp olt double %8, undef
+  %11 = or i1 %9, %10
+  br i1 %11, label %12, label %14
+
+; <label>:12                                      ; preds = %4                  
+  %13 = tail call double @fmod(double %8, double 0.000000e+00) nounwind
+  unreachable
+
+; <label>:14                                      ; preds = %4                  
+  ret void
+}
+
+declare double @foo()
+
+declare double @fmod(double, double)