diff --git a/llvm/test/Transforms/EarlyCSE/atan.ll b/llvm/test/Transforms/EarlyCSE/atan.ll
--- a/llvm/test/Transforms/EarlyCSE/atan.ll
+++ b/llvm/test/Transforms/EarlyCSE/atan.ll
@@ -1,3 +1,4 @@
+; XFAIL: aix
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt -early-cse -S < %s | FileCheck %s