[compiler-rt] a9bb97e - [msan] Break optimization in memccpy tests

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2021-12-22T14:45:20+01:00
New Revision: a9bb97e8410b09446c8d6da3b7bb493f79a4aaea

URL: https://github.com/llvm/llvm-project/commit/a9bb97e8410b09446c8d6da3b7bb493f79a4aaea
DIFF: https://github.com/llvm/llvm-project/commit/a9bb97e8410b09446c8d6da3b7bb493f79a4aaea.diff

LOG: [msan] Break optimization in memccpy tests

After D116148 the memccpy gets optimized away and the expected
uninitialized memory access does not occur.

Make sure the call does not get optimized away.

Added: 
    

Modified: 
    compiler-rt/lib/msan/tests/msan_test.cpp

Removed: 
    


################################################################################
diff  --git a/compiler-rt/lib/msan/tests/msan_test.cpp b/compiler-rt/lib/msan/tests/msan_test.cpp
index 085e9040221ef..00b736e93adeb 100644
--- a/compiler-rt/lib/msan/tests/msan_test.cpp
+++ b/compiler-rt/lib/msan/tests/msan_test.cpp
@@ -1560,6 +1560,7 @@ TEST(MemorySanitizer, memccpy_nomatch_positive) {
   char* y = new char[5];
   strcpy(x, "abc");
   EXPECT_UMR(memccpy(y, x, 'd', 5));
+  break_optimization(y);
   delete[] x;
   delete[] y;
 }
@@ -1570,6 +1571,7 @@ TEST(MemorySanitizer, memccpy_match_positive) {
   x[0] = 'a';
   x[2] = 'b';
   EXPECT_UMR(memccpy(y, x, 'b', 5));
+  break_optimization(y);
   delete[] x;
   delete[] y;
 }