diff --git a/fail_db.txt b/fail_db.txt
index 000853f1..ddd57b69 100644
--- a/fail_db.txt
+++ b/fail_db.txt
@@ -189,3 +189,19 @@
 ./tests/short-circuit-7.ispc runfail  x86-64 avx512knl-i32x16   Linux LLVM 3.7 clang++3.7 -O0 *
 ./tests/short-circuit-8.ispc runfail  x86-64 avx512knl-i32x16   Linux LLVM 3.7 clang++3.7 -O0 *
 ./tests/short-circuit-9.ispc runfail  x86-64 avx512knl-i32x16   Linux LLVM 3.7 clang++3.7 -O0 *
+./tests/acos.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O2 *
+./tests/asin.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O2 *
+./tests/operators2.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O2 *
+./tests/packed-store-1.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O2 *
+./tests/packed-store2-1.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O2 *
+./tests/short-circuit-14.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O2 *
+./tests/short-circuit-15.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O2 *
+./tests/acos.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O0 *
+./tests/asin.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O0 *
+./tests/short-circuit-14.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O0 *
+./tests/short-circuit-15.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O0 *
+./tests/short-circuit-5.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O0 *
+./tests/short-circuit-6.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O0 *
+./tests/short-circuit-7.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O0 *
+./tests/short-circuit-8.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O0 *
+./tests/short-circuit-9.ispc runfail  x86-64 avx512knl-i32x16     Mac LLVM 3.7 clang++3.7 -O0 *