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diff --git a/test/NaCl/Bitcode/implicit-datalayout.ll b/test/NaCl/Bitcode/implicit-datalayout.ll
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+; RUN: llvm-as < %s | pnacl-freeze | pnacl-thaw - | llvm-dis - | FileCheck %s
+
+; The "datalayout" field is considered to be implicit in the pexe. It
+; is not stored in the pexe; the reader adds it implicitly.
+;
+; The most important parts of the datalayout for PNaCl are the pointer
+; size and the endianness ("e" for little endian).
+
+; CHECK: target datalayout = "e{{.*}}p:32:32:32{{.*}}"