diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -26963,6 +26963,9 @@
                          DAG.getConstant(0, dl, MVT::i32),
                          DAG.getConstant(0, dl, MVT::i32));
     }
+    // Sanitizer memory access check.
+    case llvm::Intrinsic::x86_asan_check_memaccess:
+    // Flags read/write.
     case llvm::Intrinsic::x86_flags_read_u32:
     case llvm::Intrinsic::x86_flags_read_u64:
     case llvm::Intrinsic::x86_flags_write_u32: