diff --git a/llvm/test/Transforms/InstCombine/icmp.ll b/llvm/test/Transforms/InstCombine/icmp.ll
index 554619caa61510..95c006e76ccb8c 100644
--- a/llvm/test/Transforms/InstCombine/icmp.ll
+++ b/llvm/test/Transforms/InstCombine/icmp.ll
@@ -3930,3 +3930,23 @@ bb:
   %i3 = icmp eq i32 %i, %i2
   ret i1 %i3
 }
+
+; PR50944
+
+define i1 @thread_cmp_over_select_with_poison_trueval(i1 %b) {
+; CHECK-LABEL: @thread_cmp_over_select_with_poison_trueval(
+; CHECK-NEXT:    ret i1 poison
+;
+  %s = select i1 %b, i32 poison, i32 0
+  %tobool = icmp ne i32 %s, 0
+  ret i1 %tobool
+}
+
+define i1 @thread_cmp_over_select_with_poison_falseval(i1 %b) {
+; CHECK-LABEL: @thread_cmp_over_select_with_poison_falseval(
+; CHECK-NEXT:    ret i1 poison
+;
+  %s = select i1 %b, i32 1, i32 poison
+  %tobool = icmp ne i32 %s, 0
+  ret i1 %tobool
+}