diff --git a/libdevice/fallback-cassert.cpp b/libdevice/fallback-cassert.cpp
index 5f7bcafa6ecc0..a515cdcb975d1 100644
--- a/libdevice/fallback-cassert.cpp
+++ b/libdevice/fallback-cassert.cpp
@@ -7,99 +7,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "atomic.hpp"
-#include "include/assert-happened.hpp"
 #include "wrapper.h"
 
-#if defined(__SPIR__) || defined(__SPIRV__)
-
-#define ASSERT_NONE 0
-#define ASSERT_START 1
-#define ASSERT_FINISH 2
-
-// definition
-SPIR_GLOBAL AssertHappened SPIR_AssertHappenedMem;
-
-DEVICE_EXTERN_C void __devicelib_assert_read(void *_Dst) {
-  AssertHappened *Dst = (AssertHappened *)_Dst;
-  int Flag = atomicLoad(&SPIR_AssertHappenedMem.Flag);
-
-  if (ASSERT_NONE == Flag) {
-    Dst->Flag = Flag;
-    return;
-  }
-
-  if (Flag != ASSERT_FINISH)
-    while (ASSERT_START == atomicLoad(&SPIR_AssertHappenedMem.Flag))
-      ;
-
-  *Dst = SPIR_AssertHappenedMem;
-}
-
-DEVICE_EXTERN_C void __devicelib_assert_fail(const char *expr, const char *file,
-                                             int32_t line, const char *func,
-                                             uint64_t gid0, uint64_t gid1,
-                                             uint64_t gid2, uint64_t lid0,
-                                             uint64_t lid1, uint64_t lid2) {
-  int Expected = ASSERT_NONE;
-  int Desired = ASSERT_START;
-
-  if (atomicCompareAndSet(&SPIR_AssertHappenedMem.Flag, Desired, Expected) ==
-      Expected) {
-    SPIR_AssertHappenedMem.Line = line;
-    SPIR_AssertHappenedMem.GID0 = gid0;
-    SPIR_AssertHappenedMem.GID1 = gid1;
-    SPIR_AssertHappenedMem.GID2 = gid2;
-    SPIR_AssertHappenedMem.LID0 = lid0;
-    SPIR_AssertHappenedMem.LID1 = lid1;
-    SPIR_AssertHappenedMem.LID2 = lid2;
-
-    int ExprLength = 0;
-    int FileLength = 0;
-    int FuncLength = 0;
-
-    if (expr)
-      for (const char *C = expr; *C != '\0'; ++C, ++ExprLength)
-        ;
-    if (file)
-      for (const char *C = file; *C != '\0'; ++C, ++FileLength)
-        ;
-    if (func)
-      for (const char *C = func; *C != '\0'; ++C, ++FuncLength)
-        ;
-
-    int MaxExprIdx = sizeof(SPIR_AssertHappenedMem.Expr) - 1;
-    int MaxFileIdx = sizeof(SPIR_AssertHappenedMem.File) - 1;
-    int MaxFuncIdx = sizeof(SPIR_AssertHappenedMem.Func) - 1;
-
-    if (ExprLength < MaxExprIdx)
-      MaxExprIdx = ExprLength;
-    if (FileLength < MaxFileIdx)
-      MaxFileIdx = FileLength;
-    if (FuncLength < MaxFuncIdx)
-      MaxFuncIdx = FuncLength;
-
-    for (int Idx = 0; Idx < MaxExprIdx; ++Idx)
-      SPIR_AssertHappenedMem.Expr[Idx] = expr[Idx];
-    SPIR_AssertHappenedMem.Expr[MaxExprIdx] = '\0';
-
-    for (int Idx = 0; Idx < MaxFileIdx; ++Idx)
-      SPIR_AssertHappenedMem.File[Idx] = file[Idx];
-    SPIR_AssertHappenedMem.File[MaxFileIdx] = '\0';
-
-    for (int Idx = 0; Idx < MaxFuncIdx; ++Idx)
-      SPIR_AssertHappenedMem.Func[Idx] = func[Idx];
-    SPIR_AssertHappenedMem.Func[MaxFuncIdx] = '\0';
-
-    // Show we've done copying
-    atomicStore(&SPIR_AssertHappenedMem.Flag, ASSERT_FINISH);
-  }
-
-  // FIXME: call SPIR-V unreachable instead
-  // volatile int *die = (int *)0x0;
-  // *die = 0xdead;
-}
-#endif // __SPIR__ || __SPIRV__
-
 #if defined(__NVPTX__) || defined(__AMDGCN__)
 
 DEVICE_EXTERN_C void __assertfail(const char *__message, const char *__file,
diff --git a/libdevice/include/assert-happened.hpp b/libdevice/include/assert-happened.hpp
deleted file mode 100644
index e6db239d8c315..0000000000000
--- a/libdevice/include/assert-happened.hpp
+++ /dev/null
@@ -1,48 +0,0 @@
-//==-- assert-happened.hpp - Structure and declaration for assert support --==//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-#pragma once
-
-// Treat this header as system one to workaround frontend's restriction
-#pragma clang system_header
-
-#if defined(__SPIR__) || defined(__SPIRV__)
-
-// NOTE Layout of this structure should be aligned with the one in
-// sycl/include/sycl/detail/assert_happened.hpp
-struct AssertHappened {
-  int Flag = 0;
-  char Expr[256 + 1] = "";
-  char File[256 + 1] = "";
-  char Func[128 + 1] = "";
-
-  int32_t Line = 0;
-
-  uint64_t GID0 = 0;
-  uint64_t GID1 = 0;
-  uint64_t GID2 = 0;
-
-  uint64_t LID0 = 0;
-  uint64_t LID1 = 0;
-  uint64_t LID2 = 0;
-};
-
-#ifndef SPIR_GLOBAL_VAR
-#ifdef __SYCL_DEVICE_ONLY__
-#define SPIR_GLOBAL_VAR __attribute__((sycl_global_var))
-#else
-#warning "SPIR_GLOBAL_VAR not defined in host mode. Defining as empty macro."
-#define SPIR_GLOBAL_VAR
-#endif
-#endif
-
-#define __SYCL_GLOBAL__ __attribute__((opencl_global))
-
-// declaration
-extern SPIR_GLOBAL_VAR __SYCL_GLOBAL__ AssertHappened SPIR_AssertHappenedMem;
-
-#endif