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llvm-project/clang/test/CodeGen/tsan-instrprof-atomic.c

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[InstrProf] Use atomic profile counter updates for TSan Thread sanitizer instrumentation fails to skip all loads and stores to profile counters. This can happen if profile counter updates are merged: %.sink = phi i64* ... %pgocount5 = load i64, i64* %.sink %27 = add i64 %pgocount5, 1 %28 = bitcast i64* %.sink to i8* call void @__tsan_write8(i8* %28) store i64 %27, i64* %.sink To suppress TSan diagnostics about racy counter updates, make the counter updates atomic when TSan is enabled. If there's general interest in this mode it can be surfaced as a clang/swift driver option. Testing: check-{llvm,clang,profile} rdar://40477803 Differential Revision: https://reviews.llvm.org/D50867 llvm-svn: 339955
2018-08-17 06:24:47 +08:00
// RUN: %clang_cc1 %s -emit-llvm -fprofile-instrument=clang -fsanitize=thread -o - | FileCheck %s
Relax a CHECK line to allow for dso_local Fixes a bot failure: http://lab.llvm.org:8011/builders/llvm-clang-x86_64-expensive-checks-win/builds/11806 llvm-svn: 339964
2018-08-17 07:19:50 +08:00
// CHECK: define {{.*}}@foo
[InstrProf] Use atomic profile counter updates for TSan Thread sanitizer instrumentation fails to skip all loads and stores to profile counters. This can happen if profile counter updates are merged: %.sink = phi i64* ... %pgocount5 = load i64, i64* %.sink %27 = add i64 %pgocount5, 1 %28 = bitcast i64* %.sink to i8* call void @__tsan_write8(i8* %28) store i64 %27, i64* %.sink To suppress TSan diagnostics about racy counter updates, make the counter updates atomic when TSan is enabled. If there's general interest in this mode it can be surfaced as a clang/swift driver option. Testing: check-{llvm,clang,profile} rdar://40477803 Differential Revision: https://reviews.llvm.org/D50867 llvm-svn: 339955
2018-08-17 06:24:47 +08:00
// CHECK-NOT: load {{.*}}foo
// CHECK: ret void
void foo() {}