!14112 [MSLITE] Fix the bug of matmul int8 for arm32

From: @zhanyuan1
Reviewed-by: @zhang_xue_tong,@zhanghaibo5
Signed-off-by: @zhang_xue_tong

mindspore/lite/nnacl/int8/matmul_int8.c

@@ -32,6 +32,19 @@ void RowMajor2Row2x16MajorInt8(int8_t *src_ptr, int8_t *dst_ptr, int row, int co
   }
 }
 
+void RowMajor2Col16x2MajorInt8(int8_t *src_ptr, int8_t *dst_ptr, int row, int col) {
+  int row16 = UP_ROUND(row, C16NUM);
+  int stride = sizeof(int8_t) * C16NUM * C2NUM;
+  for (int r = 0; r < row; ++r) {
+    for (int c = 0; c < col; ++c) {
+      int stride_idx = c / C2NUM * (row16 / C16NUM) + r / C16NUM;
+      int dst_idx = stride * stride_idx + c % C2NUM * C16NUM + r % C16NUM;
+      int src_idx = r * col + c;
+      dst_ptr[dst_idx] = src_ptr[src_idx];
+    }
+  }
+}
+
 void RowMajor2Row8x4MajorInt8(const int8_t *src_ptr, int8_t *dst_ptr, int row, int col) {
   int col4 = UP_ROUND(col, C4NUM);
   for (int r = 0; r < row; r++) {

mindspore/lite/nnacl/int8/matmul_int8.h

@@ -48,6 +48,7 @@ void MatMulInt8_8x8_r(const int8_t *a, const int8_t *b, int8_t *dst, size_t row,
 /* 4x16 16x2 -> 4x2 */
 /* arm32 conv1x1 */
 void RowMajor2Row2x16MajorInt8(int8_t *src_ptr, int8_t *dst_ptr, int row, int col);
+void RowMajor2Col16x2MajorInt8(int8_t *src_ptr, int8_t *dst_ptr, int row, int col);
 void MatMulInt8_4x2_r(const int8_t *a, const int8_t *b, int8_t *dst, size_t row, size_t col, size_t deep_16,
                       size_t stride, const int32_t *input_sum, const int32_t *bias, int32_t *left_shift,
                       int32_t *right_shift, int32_t *multiplier, int32_t output_zp, int32_t mini, int32_t maxi,

mindspore/lite/src/runtime/kernel/arm/int8/matmul_base_int8.cc

@@ -33,7 +33,7 @@ int MatmulBaseInt8Run(void *cdata, int task_id) {
 }
 
 int MatmulBaseInt8CPUKernel::RunImpl(int task_id) {
-  int stride = thread_stride_ * C4NUM;
+  int stride = thread_stride_ * col_tile_;
   int cur_stride = task_id * stride;
   int res_stride = param_->col_ - cur_stride;
   int cur_oc = MSMIN(stride, res_stride);
@@ -155,16 +155,23 @@ void MatmulBaseInt8CPUKernel::InitQuantParam() {
 void MatmulBaseInt8CPUKernel::InitParameter() {
   param_->a_const_ = (in_tensors_[0]->data_c() != nullptr);
   param_->b_const_ = (in_tensors_[1]->data_c() != nullptr);
+#ifdef ENABLE_ARM32
+  row_tile_ = C4NUM;
+  col_tile_ = C2NUM;
+#else
+  row_tile_ = C4NUM;
+  col_tile_ = C4NUM;
+#endif
   return;
 }
 
 void MatmulBaseInt8CPUKernel::ResizeParameter() {
-  param_->row_align_ = UP_ROUND(param_->row_, C4NUM);
-  param_->col_align_ = UP_ROUND(param_->col_, C4NUM);
+  param_->row_align_ = UP_ROUND(param_->row_, row_tile_);
+  param_->col_align_ = UP_ROUND(param_->col_, col_tile_);
   param_->deep_16_ = UP_ROUND(param_->deep_, C16NUM);
 
-  thread_count_ = MSMIN(op_parameter_->thread_num_, UP_DIV(param_->col_align_, C4NUM));
-  thread_stride_ = UP_DIV(UP_DIV(param_->col_align_, C4NUM), thread_count_);
+  thread_count_ = MSMIN(op_parameter_->thread_num_, UP_DIV(param_->col_align_, col_tile_));
+  thread_stride_ = UP_DIV(UP_DIV(param_->col_align_, col_tile_), thread_count_);
   return;
 }
 
@@ -195,11 +202,19 @@ void MatmulBaseInt8CPUKernel::TransferB() {
     auto current_b_pack = pack_b_ptr_ + i * param_->col_align_ * param_->deep_16_;
     auto current_sums = weight_bias_sums_ + i * param_->col_align_;
     if (param_->b_transpose_) {
+#ifdef ENABLE_ARM32
+      RowMajor2Row2x16MajorInt8(current_weight, current_b_pack, param_->col_, param_->deep_);
+#else
       RowMajor2Row16x4MajorInt8(current_weight, current_b_pack, param_->col_, param_->deep_);
+#endif
       CalcWeightBiasSums(current_weight, param_->deep_, param_->col_, quant_.input_.zp_, quant_.filter_zp_, bias_ptr_,
                          current_sums, ColMajor, filter_per_channel_);
     } else {
+#ifdef ENABLE_ARM32
+      RowMajor2Col16x2MajorInt8(current_weight, current_b_pack, param_->deep_, param_->col_);
+#else
       RowMajor2Col16x4MajorInt8(current_weight, param_->deep_, param_->col_, current_b_pack);
+#endif
       CalcWeightBiasSums(current_weight, param_->deep_, param_->col_, quant_.input_.zp_, quant_.filter_zp_, bias_ptr_,
                          current_sums, RowMajor, false);
     }

mindspore/lite/src/runtime/kernel/arm/int8/matmul_base_int8.h

@@ -75,6 +75,8 @@ class MatmulBaseInt8CPUKernel : public LiteKernel {
   int8_t *batch_b_ptr_ = nullptr;
   int8_t *batch_c_ptr_ = nullptr;
   int *batch_sums_ = nullptr;
+  int row_tile_ = C4NUM;
+  int col_tile_ = C4NUM;
 };
 }  // namespace mindspore::kernel