From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Michael Yang <git@mxy.ng>
Date: Thu, 1 May 2025 13:45:12 -0700
Subject: [PATCH] add argsort and cuda copy for i32

---
 ggml/src/ggml-cpu/ops.cpp            |  43 ++++++++++
 ggml/src/ggml-cuda/argsort.cu        | 122 ++++++++++++++++++++++++---
 ggml/src/ggml-cuda/cpy-utils.cuh     |   6 ++
 ggml/src/ggml-cuda/cpy.cu            |  40 +++++++++
 ggml/src/ggml-metal/ggml-metal.metal |  64 ++++++++++++++
 5 files changed, 263 insertions(+), 12 deletions(-)

diff --git a/ggml/src/ggml-cpu/ops.cpp b/ggml/src/ggml-cpu/ops.cpp
index b52f0f847..902fdad69 100644
--- a/ggml/src/ggml-cpu/ops.cpp
+++ b/ggml/src/ggml-cpu/ops.cpp
@@ -7889,6 +7889,45 @@ static void ggml_compute_forward_argsort_f32(
     }
 }
 
+static void ggml_compute_forward_argsort_i32(
+    const ggml_compute_params * params,
+    ggml_tensor * dst) {
+
+    const ggml_tensor * src0 = dst->src[0];
+
+    GGML_TENSOR_UNARY_OP_LOCALS
+
+    GGML_ASSERT(nb0 == sizeof(int32_t));
+
+    const int ith = params->ith;
+    const int nth = params->nth;
+
+    const int64_t nr = ggml_nrows(src0);
+
+    ggml_sort_order order = (ggml_sort_order) ggml_get_op_params_i32(dst, 0);
+
+    for (int64_t i = ith; i < nr; i += nth) {
+        int32_t * dst_data = (int32_t *)((char *) dst->data + i*nb1);
+        const int32_t * src_data = (int32_t *)((char *) src0->data + i*nb01);
+
+        for (int64_t j = 0; j < ne0; j++) {
+            dst_data[j] = j;
+        }
+
+        // C doesn't have a functional sort, so we do a bubble sort instead
+        for (int64_t j = 0; j < ne0; j++) {
+            for (int64_t k = j + 1; k < ne0; k++) {
+                if ((order == GGML_SORT_ORDER_ASC  && src_data[dst_data[j]] > src_data[dst_data[k]]) ||
+                    (order == GGML_SORT_ORDER_DESC && src_data[dst_data[j]] < src_data[dst_data[k]])) {
+                    int32_t tmp = dst_data[j];
+                    dst_data[j] = dst_data[k];
+                    dst_data[k] = tmp;
+                }
+            }
+        }
+    }
+}
+
 void ggml_compute_forward_argsort(
     const ggml_compute_params * params,
     ggml_tensor * dst) {
@@ -7900,6 +7939,10 @@ void ggml_compute_forward_argsort(
             {
                 ggml_compute_forward_argsort_f32(params, dst);
             } break;
+        case GGML_TYPE_I32:
+            {
+                ggml_compute_forward_argsort_i32(params, dst);
+            } break;
         default:
             {
                 GGML_ABORT("fatal error");
diff --git a/ggml/src/ggml-cuda/argsort.cu b/ggml/src/ggml-cuda/argsort.cu
index 6e7b90d42..08dd30525 100644
--- a/ggml/src/ggml-cuda/argsort.cu
+++ b/ggml/src/ggml-cuda/argsort.cu
@@ -168,13 +168,107 @@ static void argsort_f32_i32_cuda_bitonic(const float *   x,
     }
 }
 
+
+template<ggml_sort_order order>
+static __global__ void k_argsort_i32_i32(const int32_t * x, int * dst, const int ncols, const int ncols_pad) {
+    extern __shared__ int shared_mem[];
+    int * indices = shared_mem;
+
+    const int tid = threadIdx.x;
+    const int row = blockIdx.y;
+
+    // Initialize all indices, handling the case where threads < ncols_pad
+    for (int i = tid; i < ncols_pad; i += blockDim.x) {
+        indices[i] = i < ncols ? i : 0; // Use 0 for padding indices
+    }
+    __syncthreads();
+
+    // Bitonic sort
+    for (int k = 2; k <= ncols_pad; k *= 2) {
+        for (int j = k/2; j > 0; j /= 2) {
+            for (int i = tid; i < ncols_pad; i += blockDim.x) {
+                const int ij = i ^ j;
+                if (ij > i) {
+                    // Only compare values within the actual data range
+                    if (i < ncols && ij < ncols) {
+                        if ((i & k) == 0) {
+                            if (order == GGML_SORT_ORDER_ASC) {
+                                if (x[row * ncols + indices[i]] > x[row * ncols + indices[ij]]) {
+                                    int tmp = indices[i];
+                                    indices[i] = indices[ij];
+                                    indices[ij] = tmp;
+                                }
+                            } else {
+                                if (x[row * ncols + indices[i]] < x[row * ncols + indices[ij]]) {
+                                    int tmp = indices[i];
+                                    indices[i] = indices[ij];
+                                    indices[ij] = tmp;
+                                }
+                            }
+                        } else {
+                            if (order == GGML_SORT_ORDER_ASC) {
+                                if (x[row * ncols + indices[i]] < x[row * ncols + indices[ij]]) {
+                                    int tmp = indices[i];
+                                    indices[i] = indices[ij];
+                                    indices[ij] = tmp;
+                                }
+                            } else {
+                                if (x[row * ncols + indices[i]] > x[row * ncols + indices[ij]]) {
+                                    int tmp = indices[i];
+                                    indices[i] = indices[ij];
+                                    indices[ij] = tmp;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+            __syncthreads();
+        }
+    }
+
+    // Write sorted indices to output, only threads handling valid data
+    for (int i = tid; i < ncols; i += blockDim.x) {
+        dst[row * ncols + i] = indices[i];
+    }
+}
+
+static void argsort_i32_i32_cuda(const int32_t * x, int * dst, const int ncols, const int nrows, ggml_sort_order order, cudaStream_t stream) {
+    // Bitonic sort requires ncols to be power of 2
+    const int ncols_pad = next_power_of_2(ncols);
+
+    // Ensure thread count doesn't exceed maximum (typically 1024)
+    const int max_threads = 1024;  // This is the typical max for most GPUs
+    const int threads_per_block = ncols_pad > max_threads ? max_threads : ncols_pad;
+
+    const dim3 block_dims(threads_per_block, 1, 1);
+    const dim3 block_nums(1, nrows, 1);
+    const size_t shared_mem = ncols_pad * sizeof(int);
+
+    // Check if shared memory size is within limits
+    const size_t max_shared_mem = ggml_cuda_info().devices[ggml_cuda_get_device()].smpb;
+
+    // Instead of logging an error, use GGML_ASSERT with a descriptive message
+    GGML_ASSERT(shared_mem <= max_shared_mem && "argsort: required shared memory exceeds device limit");
+
+    // Launch kernels with the updated thread configuration
+    if (order == GGML_SORT_ORDER_ASC) {
+        k_argsort_i32_i32<GGML_SORT_ORDER_ASC><<<block_nums, block_dims, shared_mem, stream>>>(x, dst, ncols, ncols_pad);
+    } else if (order == GGML_SORT_ORDER_DESC) {
+        k_argsort_i32_i32<GGML_SORT_ORDER_DESC><<<block_nums, block_dims, shared_mem, stream>>>(x, dst, ncols, ncols_pad);
+    } else {
+        GGML_ABORT("fatal error");
+    }
+}
+
+
 void ggml_cuda_op_argsort(ggml_backend_cuda_context & ctx, ggml_tensor * dst) {
     const ggml_tensor * src0 = dst->src[0];
     const float * src0_d = (const float *)src0->data;
     float * dst_d = (float *)dst->data;
     cudaStream_t stream = ctx.stream();
 
-    GGML_ASSERT(src0->type == GGML_TYPE_F32);
+    GGML_ASSERT(src0->type == GGML_TYPE_F32 || src0->type == GGML_TYPE_I32);
     GGML_ASSERT( dst->type == GGML_TYPE_I32);
     GGML_ASSERT(ggml_is_contiguous(src0));
 
@@ -183,18 +277,22 @@ void ggml_cuda_op_argsort(ggml_backend_cuda_context & ctx, ggml_tensor * dst) {
 
     enum ggml_sort_order order = (enum ggml_sort_order) dst->op_params[0];
 
-#ifdef GGML_CUDA_USE_CUB
-    const int    ncols_pad      = next_power_of_2(ncols);
-    const size_t shared_mem     = ncols_pad * sizeof(int);
-    const size_t max_shared_mem = ggml_cuda_info().devices[ggml_cuda_get_device()].smpb;
-
-    if (shared_mem > max_shared_mem || ncols > 1024) {
-        ggml_cuda_pool & pool = ctx.pool();
-        argsort_f32_i32_cuda_cub(pool, src0_d, (int *) dst_d, ncols, nrows, order, stream);
+    if (src0->type == GGML_TYPE_I32) {
+        argsort_i32_i32_cuda((const int32_t *)src0_d, (int *)dst_d, ncols, nrows, order, stream);
     } else {
-        argsort_f32_i32_cuda_bitonic(src0_d, (int *) dst_d, ncols, nrows, order, stream);
-    }
+#ifdef GGML_CUDA_USE_CUB
+        const int    ncols_pad      = next_power_of_2(ncols);
+        const size_t shared_mem     = ncols_pad * sizeof(int);
+        const size_t max_shared_mem = ggml_cuda_info().devices[ggml_cuda_get_device()].smpb;
+
+        if (shared_mem > max_shared_mem || ncols > 1024) {
+            ggml_cuda_pool & pool = ctx.pool();
+            argsort_f32_i32_cuda_cub(pool, src0_d, (int *) dst_d, ncols, nrows, order, stream);
+        } else {
+            argsort_f32_i32_cuda_bitonic(src0_d, (int *) dst_d, ncols, nrows, order, stream);
+        }
 #else
-    argsort_f32_i32_cuda_bitonic(src0_d, (int *) dst_d, ncols, nrows, order, stream);
+        argsort_f32_i32_cuda_bitonic(src0_d, (int *) dst_d, ncols, nrows, order, stream);
 #endif
+    }
 }
diff --git a/ggml/src/ggml-cuda/cpy-utils.cuh b/ggml/src/ggml-cuda/cpy-utils.cuh
index e621cb981..597c0c8b3 100644
--- a/ggml/src/ggml-cuda/cpy-utils.cuh
+++ b/ggml/src/ggml-cuda/cpy-utils.cuh
@@ -215,3 +215,9 @@ template<typename src_t, typename dst_t>
 static __device__ void cpy_1_flt(const char * cxi, char * cdsti) {
     *(dst_t *) cdsti = ggml_cuda_cast<dst_t>(*(const src_t *) cxi);
 }
+
+static __device__ void cpy_1_i32_i32(const char * cxi, char * cdsti) {
+    const int32_t * src = (const int32_t *)cxi;
+    int32_t * dst = (int32_t *)cdsti;
+    *dst = *src;
+}
diff --git a/ggml/src/ggml-cuda/cpy.cu b/ggml/src/ggml-cuda/cpy.cu
index 12d5bf776..a0e34030e 100644
--- a/ggml/src/ggml-cuda/cpy.cu
+++ b/ggml/src/ggml-cuda/cpy.cu
@@ -251,6 +251,43 @@ static void ggml_cpy_f32_iq4_nl_cuda(
         (cx, cdst, ne, ne00, ne01, ne02, nb00, nb01, nb02, nb03, ne10, ne11, ne12, nb10, nb11, nb12, nb13);
 }
 
+template <cpy_kernel_t cpy_1>
+static __global__ void cpy_i32_i32(
+    const char *cx, char *cdst, const int ne,
+    const int ne00, const int ne01, const int ne02, const int nb00, const int nb01, const int nb02, const int nb03,
+    const int ne10, const int ne11, const int ne12, const int nb10, const int nb11, const int nb12, const int nb13, cudaStream_t stream) {
+
+    const int64_t i = blockDim.x * blockIdx.x + threadIdx.x;
+
+    if (i >= ne) {
+        return;
+    }
+
+    const int64_t i03 = i / (ne00 * ne01 * ne02);
+    const int64_t i02 = (i - i03 * ne00 * ne01 * ne02) / (ne00 * ne01);
+    const int64_t i01 = (i - i03 * ne00 * ne01 * ne02 - i02 * ne01 * ne00) / ne00;
+    const int64_t i00 = i - i03 * ne00 * ne01 * ne02 - i02 * ne01 * ne00 - i01 * ne00;
+    const int64_t x_offset = i00 * nb00 + i01 * nb01 + i02 * nb02 + i03 * nb03;
+
+    const int64_t i13 = i / (ne10 * ne11 * ne12);
+    const int64_t i12 = (i - i13 * ne10 * ne11 * ne12) / (ne10 * ne11);
+    const int64_t i11 = (i - i13 * ne10 * ne11 * ne12 - i12 * ne10 * ne11) / ne10;
+    const int64_t i10 = i - i13 * ne10 * ne11 * ne12 - i12 * ne10 * ne11 - i11 * ne10;
+    const int64_t dst_offset = i10 * nb10 + i11 * nb11 + i12 * nb12 + i13 * nb13;
+
+    cpy_1(cx + x_offset, cdst + dst_offset);
+}
+
+static void ggml_cpy_i32_i32_cuda(
+    const char * cx, char * cdst, const int ne,
+    const int ne00, const int ne01, const int ne02, const int nb00, const int nb01, const int nb02, const int nb03,
+    const int ne10, const int ne11, const int ne12, const int nb10, const int nb11, const int nb12, const int nb13, cudaStream_t stream) {
+
+    const int num_blocks = (ne + CUDA_CPY_BLOCK_SIZE - 1) / CUDA_CPY_BLOCK_SIZE;
+    cpy_i32_i32<cpy_1_i32_i32><<<num_blocks, CUDA_CPY_BLOCK_SIZE, 0, stream>>>
+        (cx, cdst, ne, ne00, ne01, ne02, nb00, nb01, nb02, nb03, ne10, ne11, ne12, nb10, nb11, nb12, nb13, stream);
+}
+
 void ggml_cuda_cpy(ggml_backend_cuda_context & ctx, const ggml_tensor * src0, ggml_tensor * src1) {
     const int64_t ne = ggml_nelements(src0);
     GGML_ASSERT(ne == ggml_nelements(src1));
@@ -332,6 +369,9 @@ void ggml_cuda_cpy(ggml_backend_cuda_context & ctx, const ggml_tensor * src0, gg
         ggml_cpy_flt_cuda<half, nv_bfloat16> (src0_ddc, src1_ddc, ne, ne00, ne01, ne02, nb00, nb01, nb02, nb03, ne10, ne11, ne12, nb10, nb11, nb12, nb13, main_stream);
     } else if (src0->type == GGML_TYPE_F16 && src1->type == GGML_TYPE_F32) {
         ggml_cpy_flt_cuda<half, float> (src0_ddc, src1_ddc, ne, ne00, ne01, ne02, nb00, nb01, nb02, nb03, ne10, ne11, ne12, nb10, nb11, nb12, nb13, main_stream);
+    } else if (src0->type == GGML_TYPE_I32 && src1->type == GGML_TYPE_I32) {
+        // TODO consider converting to template
+        ggml_cpy_i32_i32_cuda(src0_ddc, src1_ddc, ne, ne00, ne01, ne02, nb00, nb01, nb02, nb03, ne10, ne11, ne12, nb10, nb11, nb12, nb13, main_stream);
     } else if (src0->type == GGML_TYPE_BF16 && src1->type == GGML_TYPE_BF16) {
         ggml_cpy_flt_cuda<nv_bfloat16, nv_bfloat16> (src0_ddc, src1_ddc, ne, ne00, ne01, ne02, nb00, nb01, nb02, nb03, ne10, ne11, ne12, nb10, nb11, nb12, nb13, main_stream);
     } else if (src0->type == GGML_TYPE_BF16 && src1->type == GGML_TYPE_F16) {
diff --git a/ggml/src/ggml-metal/ggml-metal.metal b/ggml/src/ggml-metal/ggml-metal.metal
index 2c2f01415..50b8071de 100644
--- a/ggml/src/ggml-metal/ggml-metal.metal
+++ b/ggml/src/ggml-metal/ggml-metal.metal
@@ -4467,8 +4467,72 @@ kernel void kernel_argsort_f32_i32(
     }
 }
 
+typedef void (i32_argsort_t)(
+        constant   ggml_metal_kargs_argsort & args,
+        device  const int32_t * x,
+        device        int32_t * dst,
+        threadgroup   int32_t * shared_values [[threadgroup(0)]],
+        uint3 tgpig[[threadgroup_position_in_grid]],
+        uint3 tpitg[[thread_position_in_threadgroup]]);
+
+template<ggml_sort_order order>
+kernel void kernel_argsort_i32_i32(
+        constant   ggml_metal_kargs_argsort & args,
+        device const int32_t * x,
+        device       int32_t * dst,
+        threadgroup int32_t  * shared_values [[threadgroup(0)]],
+        uint3 tgpig[[threadgroup_position_in_grid]],
+        uint3 tpitg[[thread_position_in_threadgroup]]) {
+    // bitonic sort
+    int col = tpitg[0];
+    int row = tgpig[1];
+
+    if (col >= args.ncols_pad) return;
+
+    device const int32_t * x_row   = x + row * args.ncols;
+    threadgroup int32_t  * dst_row = shared_values;
+
+    // initialize indices
+    dst_row[col] = col;
+
+    threadgroup_barrier(mem_flags::mem_threadgroup);
+
+    for (int k = 2; k <= args.ncols_pad; k *= 2) {
+        for (int j = k / 2; j > 0; j /= 2) {
+            int ixj = col ^ j;
+            if (ixj > col) {
+                if ((col & k) == 0) {
+                    if (dst_row[col] >= args.ncols ||
+                        (dst_row[ixj] < args.ncols && (order == GGML_SORT_ORDER_ASC ?
+                            x_row[dst_row[col]] > x_row[dst_row[ixj]] :
+                            x_row[dst_row[col]] < x_row[dst_row[ixj]]))
+                    ) {
+                        SWAP(dst_row[col], dst_row[ixj]);
+                    }
+                } else {
+                    if (dst_row[ixj] >= args.ncols ||
+                        (dst_row[col] < args.ncols && (order == GGML_SORT_ORDER_ASC ?
+                            x_row[dst_row[col]] < x_row[dst_row[ixj]] :
+                            x_row[dst_row[col]] > x_row[dst_row[ixj]]))
+                    ) {
+                        SWAP(dst_row[col], dst_row[ixj]);
+                    }
+                }
+            }
+            threadgroup_barrier(mem_flags::mem_threadgroup);
+        }
+    }
+
+    // copy the result to dst without the padding
+    if (col < args.ncols) {
+        dst[row * args.ncols + col] = dst_row[col];
+    }
+}
+
 template [[host_name("kernel_argsort_f32_i32_asc")]]  kernel argsort_t kernel_argsort_f32_i32<GGML_SORT_ORDER_ASC>;
 template [[host_name("kernel_argsort_f32_i32_desc")]] kernel argsort_t kernel_argsort_f32_i32<GGML_SORT_ORDER_DESC>;
+template [[host_name("kernel_argsort_i32_i32_asc")]] kernel i32_argsort_t kernel_argsort_i32_i32<GGML_SORT_ORDER_ASC>;
+template [[host_name("kernel_argsort_i32_i32_desc")]] kernel i32_argsort_t kernel_argsort_i32_i32<GGML_SORT_ORDER_DESC>;
 
 kernel void kernel_leaky_relu_f32(
         constant     ggml_metal_kargs_leaky_relu & args,
