tsan: add a benchmark for vector memory accesses
Depends on D114592.
Reviewed By: melver
Differential Revision: https://reviews.llvm.org/D114593
GitOrigin-RevId: debac0ef37d865d3a61d9abacdd096a676f1819d
diff --git a/test/tsan/bench_memory_access.cpp b/test/tsan/bench_memory_access.cpp
index 78bb053..899ce92 100644
--- a/test/tsan/bench_memory_access.cpp
+++ b/test/tsan/bench_memory_access.cpp
@@ -79,6 +79,24 @@
}
break;
}
+#if TSAN_VECTORIZE
+ case 12: {
+ // The compiler wants to optimize all this away.
+ // Use volatile to prevent optimization, but then use kBlock
+ // to avoid the additional non-vector load in the inner loop.
+ // Also use only even indexes to prevent compiler from
+ // inserting memset.
+ const int kBlock = 128;
+ __m128i data[kBlock * 2];
+ __m128i *volatile vptr = data;
+ for (int i = 0; i < bench_niter / kBlock; i++) {
+ __m128i *ptr = vptr;
+ for (int j = 0; j < kBlock; j++)
+ _mm_store_si128(&ptr[j * 2], _mm_setzero_si128());
+ }
+ break;
+ }
+#endif
}
}
