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