diff --git a/llvm/test/CodeGen/X86/pr46585.ll b/llvm/test/CodeGen/X86/pr46585.ll
new file mode 100644
index 00000000000000..65cd6b897ea36a
--- /dev/null
+++ b/llvm/test/CodeGen/X86/pr46585.ll
@@ -0,0 +1,35 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-apple-macosx | FileCheck %s
+
+@global = external local_unnamed_addr global i8
+@global.1 = external local_unnamed_addr global i64
+
+define void @spam() local_unnamed_addr {
+; CHECK-LABEL: spam:
+; CHECK:       ## %bb.0: ## %bb
+; CHECK-NEXT:    pmovmskb %xmm0, %eax
+; CHECK-NEXT:    testb %al, %al
+; CHECK-NEXT:    je LBB0_2
+; CHECK-NEXT:  ## %bb.1: ## %bb9
+; CHECK-NEXT:    movq _global.1@{{.*}}(%rip), %rax
+; CHECK-NEXT:    movq $1, (%rax)
+; CHECK-NEXT:  LBB0_2: ## %bb8
+; CHECK-NEXT:    retq
+bb:
+  %tmp = load i8, i8* @global, align 1
+  %tmp1 = and i8 %tmp, 1
+  %tmp2 = insertelement <8 x i8> undef, i8 %tmp1, i32 0
+  %tmp3 = ashr <8 x i8> %tmp2, <i8 7, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0>
+  %tmp4 = shufflevector <8 x i8> %tmp3, <8 x i8> undef, <8 x i32> zeroinitializer
+  %tmp5 = icmp slt <8 x i8> %tmp4, zeroinitializer
+  %tmp6 = bitcast <8 x i1> %tmp5 to i8
+  %tmp7 = icmp eq i8 %tmp6, 0
+  br i1 %tmp7, label %bb8, label %bb9
+
+bb8:                                              ; preds = %bb9, %bb
+  ret void
+
+bb9:                                              ; preds = %bb
+  store i64 1, i64* @global.1, align 8
+  br label %bb8
+}