Cutlass CUDA Templates for Linear Algebra Subroutines and Solvers

hgemm_multiply_add.h
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29 #pragma once
30
31 #include "cutlass/fragment.h"
32
33 #include "cutlass/gemm/thread_multiply_add.h"
34
35 namespace cutlass {
36 namespace gemm {
37
39
41 template <typename ThreadGemmShape_, typename ThreadsPerWarp_>
42 struct ThreadMultiplyAdd<ThreadGemmShape_, ThreadsPerWarp_, half, half, half> {
44 typedef Shape<1, 1, 2, 1> InstructionShape;
46 typedef ThreadGemmShape_ ThreadGemmShape;
48 typedef ThreadGemmShape AccumulatorsPerThread;
50 typedef ThreadsPerWarp_ ThreadsPerWarp;
52 typedef typename ShapeMul<ThreadGemmShape, ThreadsPerWarp>::Shape AccumulatorsPerWarp;
54 typedef half ScalarA;
56 typedef Fragment<ScalarA, AccumulatorsPerThread::kW> FragmentA;
58 typedef half ScalarB;
60 typedef Fragment<ScalarB, AccumulatorsPerThread::kH> FragmentB;
62 typedef half ScalarC;
64 typedef Fragment<half, AccumulatorsPerThread::kH * AccumulatorsPerThread::kW> Accumulators;
65
67 static_assert(AccumulatorsPerThread::kH % 2 == 0, "Invalid size");
68 static_assert(AccumulatorsPerThread::kW % 2 == 0, "Invalid size");
69
71 CUTLASS_DEVICE ThreadMultiplyAdd() {}
72
74 CUTLASS_DEVICE void multiply_add(FragmentA const& a,
75 FragmentB const& b,
76 Accumulators const& c,
77 Accumulators& d) {
78 #if defined(__CUDACC__) && __CUDA_ARCH__ >= 530
79 // The inputs.
80 __half2 const* a_half2 = reinterpret_cast<__half2 const*>(&a[0]);
81 __half2 const* b_half2 = reinterpret_cast<__half2 const*>(&b[0]);
82 __half2 const* c_half2 = reinterpret_cast<__half2 const*>(&c[0]);
83
84 // The output.
85 __half2* d_half2 = reinterpret_cast<__half2*>(&d[0]);
86
87 for (int j = 0; j < AccumulatorsPerThread::kH / 2; ++j) {
88 for (int i = 0; i < AccumulatorsPerThread::kW / 2; ++i) {
89 // The offsets in the output fragment.
90 int const k0 = (2 * j + 0) * (AccumulatorsPerThread::kW / 2) + i;
91 int const k1 = (2 * j + 1) * (AccumulatorsPerThread::kW / 2) + i;
92
93 // Compute the product a[i] * b[j].low.
94 d_half2[k0] = __hfma2(a_half2[i], __low2half2(b_half2[j]), c_half2[k0]);
95 // Compute the product a[i] * b[j].high.
96 d_half2[k1] = __hfma2(a_half2[i], __high2half2(b_half2[j]), c_half2[k1]);
97 }
98 }
99 #endif
100 }
101 };
102
104
105 } // namespace gemm
106 } // namespace cutlass
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::ThreadMultiplyAdd
CUTLASS_DEVICE ThreadMultiplyAdd()
Make sure there&#39;s an even number of elements in both dimensions.
Definition: hgemm_multiply_add.h:71
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::ScalarC
half ScalarC
The type for C and D.
Definition: hgemm_multiply_add.h:62
cutlass
Definition: convert.h:33
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::FragmentB
Fragment< ScalarB, AccumulatorsPerThread::kH > FragmentB
The fragment for B.
Definition: hgemm_multiply_add.h:60
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::ThreadGemmShape
ThreadGemmShape_ ThreadGemmShape
The number of accumulators per thread.
Definition: hgemm_multiply_add.h:46
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::ScalarB
half ScalarB
The type for B.
Definition: hgemm_multiply_add.h:58
cutlass::ShapeMul::Shape
Shape< A_::kD *B_::kD, A_::kH *B_::kH, A_::kW *B_::kW, A_::kC *B_::kC > Shape
Definition: shape.h:119
cutlass::Fragment
A template defining Fragment Concept.
Definition: fragment.h:99
thread_multiply_add.h
Template implementing matrix multiply-add operations on fragments.
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::InstructionShape
Shape< 1, 1, 2, 1 > InstructionShape
The shape of the instruction.
Definition: hgemm_multiply_add.h:44
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::AccumulatorsPerWarp
ShapeMul< ThreadGemmShape, ThreadsPerWarp >::Shape AccumulatorsPerWarp
The number of accumulators per warp.
Definition: hgemm_multiply_add.h:52
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::FragmentA
Fragment< ScalarA, AccumulatorsPerThread::kW > FragmentA
The fragment for A.
Definition: hgemm_multiply_add.h:56
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::Accumulators
Fragment< half, AccumulatorsPerThread::kH *AccumulatorsPerThread::kW > Accumulators
The accumulators.
Definition: hgemm_multiply_add.h:64
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::multiply_add
CUTLASS_DEVICE void multiply_add(FragmentA const &a, FragmentB const &b, Accumulators const &c, Accumulators &d)
Multiply : d = a*b + c.
Definition: hgemm_multiply_add.h:74
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::ScalarA
half ScalarA
The type for A.
Definition: hgemm_multiply_add.h:54
static_assert
#define static_assert(__e, __m)
Definition: platform.h:153
cutlass::Shape
A Shape implementing Layout Concept describing the dimensions of a cube.
Definition: shape.h:64
cutlass::gemm::ThreadMultiplyAdd
Template performing matrix multiply-add operation within a thread.
Definition: thread_multiply_add.h:44
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::AccumulatorsPerThread
ThreadGemmShape AccumulatorsPerThread
Aliased for compatibility. Will be removed for CUTLASS v2.0.
Definition: hgemm_multiply_add.h:48
cutlass::gemm::ThreadMultiplyAdd< ThreadGemmShape_, ThreadsPerWarp_, half, half, half >::ThreadsPerWarp
ThreadsPerWarp_ ThreadsPerWarp
The number of threads per warp.
Definition: hgemm_multiply_add.h:50
fragment.h
Defines Fragment, a statically-sized array for storing parts of matrices within a thread&#39;s registers...