Remove old code in utils.h (#511)

csrc/flash_attn/src/utils.h

@@ -87,46 +87,6 @@ inline __device__ uint32_t convert_relu2<cutlass::bfloat16_t>(const float2 x) {
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-template<typename T>
-inline __device__ float2 half2_unpack(uint32_t a);
-
-template <>
-inline __device__ float2 half2_unpack<__half>(uint32_t a) {
-    return __half22float2(reinterpret_cast<__half2 (&)>(a));
-}
-
-#if defined(__CUDA_ARCH__) && __CUDA_ARCH__ >= 800
-template <>
-inline __device__ float2 half2_unpack<__nv_bfloat16>(uint32_t a) {
-    return __bfloat1622float2(reinterpret_cast<__nv_bfloat162 (&)>(a));
-}
-#endif
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-// Convert two half2's or bf162's into float, then take their dot product.
-template <typename T>
-inline __device__ float hfma2_to_float(const uint32_t a, const uint32_t b) {
-    float2 af = flash::half2_unpack<T>(a);
-    float2 bf = flash::half2_unpack<T>(b);
-    return af.x * bf.x + af.y * bf.y;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-// Converted two vectors of 8 half's or bf16's into float, then take their dot product.
-template<typename T>
-inline __device__ float hmulsum8(const uint4 a, const uint4 b) {
-    float sum;
-    sum  = flash::hfma2_to_float<T>(a.x, b.x);
-    sum += flash::hfma2_to_float<T>(a.y, b.y);
-    sum += flash::hfma2_to_float<T>(a.z, b.z);
-    sum += flash::hfma2_to_float<T>(a.w, b.w);
-    return sum;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
 template<typename T>
 struct MaxOp {
 __device__ inline T operator()(T const & x, T const & y) { return x > y ? x : y; }