diff --git a/fail_db.txt b/fail_db.txt
index 504bb302..b147a08b 100644
--- a/fail_db.txt
+++ b/fail_db.txt
@@ -503,3 +503,29 @@
 ./tests/store-int8.ispc runfail     x86-64     sse4-i16x8   Linux LLVM 3.6 g++4.9 -O0 *
 ./tests/store-int8.ispc runfail     x86     sse4-i32x8   Linux LLVM 3.6 g++4.9 -O0 *
 ./tests/store-int8.ispc runfail     x86-64     sse4-i32x8   Linux LLVM 3.6 g++4.9 -O0 *
+./tests/atomics-6.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/atomics-uniform-8.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/atomics-uniform-9.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/paddus_vi16.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/paddus_vi8.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/pmuls_i64.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/pmulus_i16.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/pmulus_i32.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/pmulus_i64.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/pmulus_i8.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/atomics-6.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O0 *
+./tests/atomics-uniform-8.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O0 *
+./tests/atomics-uniform-9.ispc compfail  x86-64      generic-4   Linux LLVM 3.6 clang++3.4 -O0 *
+./tests/atomics-6.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/atomics-uniform-8.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/atomics-uniform-9.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/paddus_vi16.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/paddus_vi8.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/pmuls_i64.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/pmulus_i16.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/pmulus_i32.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/pmulus_i64.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/pmulus_i8.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O2 *
+./tests/atomics-6.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O0 *
+./tests/atomics-uniform-8.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O0 *
+./tests/atomics-uniform-9.ispc compfail  x86-64     generic-16   Linux LLVM 3.6 clang++3.4 -O0 *