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from 06cd0655a68 optabs: ensure mem_thread_fence is a compiler barrier new 8aaef9d6042 2017-08-28 Richard Biener rguenther@suse.de

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Summary of changes: gcc/ChangeLog | 6 ++++ gcc/testsuite/ChangeLog | 5 ++++ gcc/testsuite/g++.dg/torture/pr81977.C | 55 ++++++++++++++++++++++++++++++++++ gcc/tree-ssa-sccvn.c | 2 +- 4 files changed, 67 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/g++.dg/torture/pr81977.C