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diff --git a/clang/test/Driver/x86_features.c b/clang/test/Driver/x86_features.c
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+// RUN: %clang -target i386-unknown-unknown -### -S %s -msse -msse4 -mno-sse -mno-mmx -msse 2> %t
+// RUN: grep '"pentium4" "-target-feature" "+sse4" "-target-feature" "-mmx" "-target-feature" "+sse"' %t
+// Note that we filter out all but the last -m(no)sse.