diff --git a/llvm/test/CodeGen/X86/pr31045.ll b/llvm/test/CodeGen/X86/pr31045.ll
new file mode 100644
index 000000000000..2cd594850481
--- /dev/null
+++ b/llvm/test/CodeGen/X86/pr31045.ll
@@ -0,0 +1,89 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
+
+%struct.c.2.6.10.14.38.70.74.90.94.98.106.122.362 = type { i8, %struct.b.1.5.9.13.37.69.73.89.93.97.105.121.361, i24, i24 }
+%struct.b.1.5.9.13.37.69.73.89.93.97.105.121.361 = type { %struct.a.0.4.8.12.36.68.72.88.92.96.104.120.360, %struct.a.0.4.8.12.36.68.72.88.92.96.104.120.360, i8 }
+%struct.a.0.4.8.12.36.68.72.88.92.96.104.120.360 = type <{ i8, i16 }>
+%struct.d.3.7.11.15.39.71.75.91.95.99.107.123.363 = type <{ %struct.c.2.6.10.14.38.70.74.90.94.98.106.122.362, %struct.c.2.6.10.14.38.70.74.90.94.98.106.122.362, i8, i8 }>
+
+@var_46 = external local_unnamed_addr global i8, align 1
+@var_44 = external local_unnamed_addr global i8, align 1
+@var_163 = external local_unnamed_addr global i8, align 1
+@struct_obj_12 = external local_unnamed_addr global %struct.c.2.6.10.14.38.70.74.90.94.98.106.122.362, align 2
+@struct_obj_3 = external local_unnamed_addr global %struct.d.3.7.11.15.39.71.75.91.95.99.107.123.363, align 2
+@struct_obj_8 = external local_unnamed_addr global %struct.d.3.7.11.15.39.71.75.91.95.99.107.123.363, align 2
+@var_49 = external local_unnamed_addr constant i8, align 1
+
+; Function Attrs: norecurse nounwind uwtable
+define void @_Z1av() local_unnamed_addr #0 {
+; CHECK-LABEL: _Z1av:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    movl struct_obj_3+{{.*}}(%rip), %eax
+; CHECK-NEXT:    movsbl {{.*}}(%rip), %ecx
+; CHECK-NEXT:    movzbl {{.*}}(%rip), %edx
+; CHECK-NEXT:    movzbl {{.*}}(%rip), %esi
+; CHECK-NEXT:    andl $1, %eax
+; CHECK-NEXT:    leal (%rax,%rax), %edi
+; CHECK-NEXT:    subl %ecx, %edi
+; CHECK-NEXT:    subl %edx, %edi
+; CHECK-NEXT:    movl %edi, %ecx
+; CHECK-NEXT:    notl %ecx
+; CHECK-NEXT:    movzbl %cl, %ecx
+; CHECK-NEXT:    movw %cx, struct_obj_12+{{.*}}(%rip)
+; CHECK-NEXT:    xorl %ecx, %ecx
+; CHECK-NEXT:    testb %al, %al
+; CHECK-NEXT:    cmovel %eax, %ecx
+; CHECK-NEXT:    andl struct_obj_8+{{.*}}(%rip), %ecx
+; CHECK-NEXT:    andl $1, %ecx
+; CHECK-NEXT:    negl %ecx
+; CHECK-NEXT:    andl %esi, %ecx
+; CHECK-NEXT:    negl %ecx
+; CHECK-NEXT:    andl %eax, %ecx
+; CHECK-NEXT:    negl %ecx
+; CHECK-NEXT:    testl %ecx, %edi
+; CHECK-NEXT:    setne {{.*}}(%rip)
+; CHECK-NEXT:    retq
+entry:
+  %bf.load = load i32, i32* bitcast (i24* getelementptr inbounds (%struct.d.3.7.11.15.39.71.75.91.95.99.107.123.363, %struct.d.3.7.11.15.39.71.75.91.95.99.107.123.363* @struct_obj_3, i64 0, i32 0, i32 2) to i32*), align 2
+  %tmp = load i8, i8* @var_46, align 1
+  %conv1 = sext i8 %tmp to i32
+  %tmp1 = load i8, i8* @var_49, align 1
+  %tmp2 = zext i8 %tmp1 to i32
+  %tmp3 = shl i32 %bf.load, 1
+  %factor = and i32 %tmp3, 2
+  %sub = sub nsw i32 %factor, %conv1
+  %sub8 = sub nsw i32 %sub, %tmp2
+  %add = add nsw i32 %sub8, 0
+  %tmp4 = load i8, i8* @var_44, align 1
+  %tmp5 = zext i8 %tmp4 to i32
+  %xor = xor i32 %add, 255
+  %xor20 = xor i32 %xor, 0
+  %neg = xor i32 %xor20, 0
+  %or = or i32 0, %neg
+  %or55 = or i32 %or, 0
+  %conv56 = trunc i32 %or55 to i16
+  %bf.value = and i16 %conv56, 255
+  %bf.set = or i16 %bf.value, 0
+  store i16 %bf.set, i16* getelementptr inbounds (%struct.c.2.6.10.14.38.70.74.90.94.98.106.122.362, %struct.c.2.6.10.14.38.70.74.90.94.98.106.122.362* @struct_obj_12, i64 0, i32 1, i32 1, i32 1), align 1
+  %lnot = icmp eq i8 undef, 0
+  %bf.load65 = load i32, i32* bitcast (i24* getelementptr inbounds (%struct.d.3.7.11.15.39.71.75.91.95.99.107.123.363, %struct.d.3.7.11.15.39.71.75.91.95.99.107.123.363* @struct_obj_8, i64 0, i32 0, i32 2) to i32*), align 2
+  %tmp6 = and i32 %bf.load65, 1
+  %tmp7 = select i1 %lnot, i32 undef, i32 0
+  %mul69 = and i32 %tmp6, %tmp7
+  %tmp8 = sub nsw i32 0, %mul69
+  %mul75 = and i32 %tmp5, %tmp8
+  %tmp9 = and i32 %bf.load, 1
+  %tmp10 = sub nsw i32 0, %mul75
+  %mul80 = and i32 %tmp9, %tmp10
+  %factor109 = shl nuw nsw i32 %tmp9, 1
+  %sub86 = sub nsw i32 %factor109, %conv1
+  %sub94 = sub nsw i32 %sub86, %tmp2
+  %tmp11 = sub nsw i32 0, %mul80
+  %mul95 = and i32 %sub94, %tmp11
+  %tobool96 = icmp ne i32 %mul95, 0
+  %frombool = zext i1 %tobool96 to i8
+  store i8 %frombool, i8* @var_163, align 1
+  ret void
+}
+
+attributes #0 = { norecurse nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }