Support malloc/free for hip-clang

[ROCm/hip commit: 02d0e93601]

projects/hip/src/device_util.cpp

@@ -28,70 +28,6 @@ THE SOFTWARE.
 #include "hip/hip_runtime.h"
 #include <atomic>
 
-//=================================================================================================
-/*
- Implementation of malloc and free device functions.
-
- This is the best place to put them because the device
- global variables need to be initialized at the start.
-*/
-__device__ char gpuHeap[SIZE_OF_HEAP];
-__device__ uint32_t gpuFlags[NUM_PAGES];
-
-__device__ void* __hip_hc_malloc(size_t size) {
-    char* heap = (char*)gpuHeap;
-    if (size > SIZE_OF_HEAP) {
-        return (void*)nullptr;
-    }
-    uint32_t totalThreads =
-        blockDim.x * gridDim.x * blockDim.y * gridDim.y * blockDim.z * gridDim.z;
-    uint32_t currentWorkItem = threadIdx.x + blockDim.x * blockIdx.x;
-
-    uint32_t numHeapsPerWorkItem = NUM_PAGES / totalThreads;
-    uint32_t heapSizePerWorkItem = SIZE_OF_HEAP / totalThreads;
-
-    uint32_t stride = size / SIZE_OF_PAGE;
-    uint32_t start = numHeapsPerWorkItem * currentWorkItem;
-
-    uint32_t k = 0;
-
-    while (gpuFlags[k] > 0) {
-        k++;
-    }
-
-    for (uint32_t i = 0; i < stride - 1; i++) {
-        gpuFlags[i + start + k] = 1;
-    }
-
-    gpuFlags[start + stride - 1 + k] = 2;
-
-    void* ptr = (void*)(heap + heapSizePerWorkItem * currentWorkItem + k * SIZE_OF_PAGE);
-
-    return ptr;
-}
-
-__device__ void* __hip_hc_free(void* ptr) {
-    if (ptr == nullptr) {
-        return nullptr;
-    }
-
-    uint32_t offsetByte = (uint64_t)ptr - (uint64_t)gpuHeap;
-    uint32_t offsetPage = offsetByte / SIZE_OF_PAGE;
-
-    while (gpuFlags[offsetPage] != 0) {
-        if (gpuFlags[offsetPage] == 2) {
-            gpuFlags[offsetPage] = 0;
-            offsetPage++;
-            break;
-        } else {
-            gpuFlags[offsetPage] = 0;
-            offsetPage++;
-        }
-    }
-
-    return nullptr;
-}
-
 // abort
 __device__ void abort() { return hc::abort(); }