Index: test/CodeGen/X86/cmp-zext-combine.ll
===================================================================
--- /dev/null
+++ test/CodeGen/X86/cmp-zext-combine.ll
@@ -0,0 +1,21 @@
+; RUN: llc -mtriple=x86_64 < %s | FileCheck %s
+; RUN: llc -mtriple=i686 < %s | FileCheck %s
+
+define i32 @f(i64*, i32, i32) {
+; CHECK-LABEL: f
+  %4 = alloca i64*, align 8
+  %5 = bitcast i64** %4 to i8*
+  store i64* %0, i64** %4, align 8
+  %6 = call { i32, i32 } asm sideeffect "cmpxchg8b $2", "={ax},={dx},=*m,{bx},{cx},0,1,*m,~{flags},~{dirflag},~{fpsr},~{flags}"(i64** nonnull %4, i32 4, i32 5, i32 0, i32 0, i64** nonnull %4) #5
+  %7 = extractvalue { i32, i32 } %6, 0
+  %8 = extractvalue { i32, i32 } %6, 1
+  %9 = zext i32 %8 to i64
+  %10 = shl nuw i64 %9, 32
+; CHECK-DAG: testl %eax, %eax
+  %11 = icmp ne i32 %7, 0
+; CHECK-DAG: testl %edx, %edx
+  %12 = icmp ugt i64 %10, 4294967295
+  %13 = and i1 %11, %12
+  %14 = zext i1 %13 to i32
+  ret i32 %14
+}