1; RUN: llc < %s -march=x86 -mattr=+sse2 | not grep sfence
2; RUN: llc < %s -march=x86 -mattr=+sse2 | not grep lfence
3; RUN: llc < %s -march=x86 -mattr=+sse2 | grep mfence
4
5define void @test() {
6  fence seq_cst
7  ret void
8}
9