COMPMID-675 - Reworked NEGEMMLowp interface/function
The new interface makes NEGEMMLowp able to work with ASYMM8 data types.
Implemented 2 new functions:
- NEGEMMLowpMatrixMultiplyCore
- NEGEMMLowpOutputStage
These functions should make the integration in android NN doable
For more information about GEMMLowp:
https://github.com/google/gemmlowp/blob/master/doc/low-precision.md
Change-Id: Ie2c775f45234f68ca53dba644b3a912b997fd890
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/95504
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
diff --git a/src/core/NEON/kernels/NEGEMMLowpQuantizeDownInt32ToUint8ScaleKernel.cpp b/src/core/NEON/kernels/NEGEMMLowpQuantizeDownInt32ToUint8ScaleKernel.cpp
new file mode 100644
index 0000000..aa3c280
--- /dev/null
+++ b/src/core/NEON/kernels/NEGEMMLowpQuantizeDownInt32ToUint8ScaleKernel.cpp
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "arm_compute/core/NEON/kernels/NEGEMMLowpQuantizeDownInt32ToUint8ScaleKernel.h"
+
+#include "arm_compute/core/Error.h"
+#include "arm_compute/core/Helpers.h"
+#include "arm_compute/core/ITensor.h"
+#include "arm_compute/core/Types.h"
+#include "arm_compute/core/Validate.h"
+#include "arm_compute/core/Window.h"
+
+#include <arm_neon.h>
+#include <cstddef>
+#include <cstdint>
+
+using namespace arm_compute;
+
+namespace arm_compute
+{
+class Coordinates;
+} // namespace arm_compute
+
+NEGEMMLowpQuantizeDownInt32ToUint8ScaleKernel::NEGEMMLowpQuantizeDownInt32ToUint8ScaleKernel()
+ : _input(nullptr), _output(nullptr), _result_offset(0), _result_mult_int(0), _result_shift(0)
+{
+}
+
+void NEGEMMLowpQuantizeDownInt32ToUint8ScaleKernel::configure(const ITensor *input, ITensor *output, int result_offset, int result_mult_int, int result_shift)
+{
+ ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::S32);
+ ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(output, 1, DataType::QASYMM8);
+
+ _input = input;
+ _output = output;
+ _result_offset = result_offset;
+ _result_mult_int = result_mult_int;
+ _result_shift = result_shift;
+
+ constexpr unsigned int num_elems_processed_per_iteration = 16;
+
+ // Configure kernel window
+ Window win = calculate_max_window(*output->info(), Steps(num_elems_processed_per_iteration));
+
+ AccessWindowHorizontal input_access(input->info(), 0, num_elems_processed_per_iteration);
+ AccessWindowHorizontal output_result_access(output->info(), 0, num_elems_processed_per_iteration);
+
+ update_window_and_padding(win,
+ input_access,
+ output_result_access);
+
+ output_result_access.set_valid_region(win, ValidRegion(Coordinates(0, 0), output->info()->tensor_shape()));
+
+ INEKernel::configure(win);
+}
+
+void NEGEMMLowpQuantizeDownInt32ToUint8ScaleKernel::run(const Window &window, const ThreadInfo &info)
+{
+ ARM_COMPUTE_UNUSED(info);
+ ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
+ ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(INEKernel::window(), window);
+
+ const int32x4_t result_offset_s32 = vdupq_n_s32(_result_offset);
+ const int32x4_t result_shift_s32 = vdupq_n_s32(-_result_shift);
+ const int32x4_t zero_s32 = vdupq_n_s32(0);
+
+ Iterator in(_input, window);
+ Iterator out(_output, window);
+
+ execute_window_loop(window, [&](const Coordinates & id)
+ {
+ int32x4x4_t in_s32 =
+ {
+ {
+ vld1q_s32(reinterpret_cast<const int32_t *>(in.ptr()) + 0),
+ vld1q_s32(reinterpret_cast<const int32_t *>(in.ptr()) + 4),
+ vld1q_s32(reinterpret_cast<const int32_t *>(in.ptr()) + 8),
+ vld1q_s32(reinterpret_cast<const int32_t *>(in.ptr()) + 12)
+ }
+ };
+
+ // Add the offset terms to GEMM's result
+ in_s32.val[0] = vaddq_s32(in_s32.val[0], result_offset_s32);
+ in_s32.val[1] = vaddq_s32(in_s32.val[1], result_offset_s32);
+ in_s32.val[2] = vaddq_s32(in_s32.val[2], result_offset_s32);
+ in_s32.val[3] = vaddq_s32(in_s32.val[3], result_offset_s32);
+
+ // Multiply by c_mult_int
+ in_s32.val[0] = vmulq_n_s32(in_s32.val[0], _result_mult_int);
+ in_s32.val[1] = vmulq_n_s32(in_s32.val[1], _result_mult_int);
+ in_s32.val[2] = vmulq_n_s32(in_s32.val[2], _result_mult_int);
+ in_s32.val[3] = vmulq_n_s32(in_s32.val[3], _result_mult_int);
+
+ // Shift final result (negative value shift right)
+ in_s32.val[0] = vshlq_s32(in_s32.val[0], result_shift_s32);
+ in_s32.val[1] = vshlq_s32(in_s32.val[1], result_shift_s32);
+ in_s32.val[2] = vshlq_s32(in_s32.val[2], result_shift_s32);
+ in_s32.val[3] = vshlq_s32(in_s32.val[3], result_shift_s32);
+
+ // Saturate negative values
+ in_s32.val[0] = vmaxq_s32(in_s32.val[0], zero_s32);
+ in_s32.val[1] = vmaxq_s32(in_s32.val[1], zero_s32);
+ in_s32.val[2] = vmaxq_s32(in_s32.val[2], zero_s32);
+ in_s32.val[3] = vmaxq_s32(in_s32.val[3], zero_s32);
+
+ // Convert S32 to S16
+ const int16x8x2_t in_s16 =
+ {
+ {
+ vcombine_s16(vqmovn_s32(in_s32.val[0]), vqmovn_s32(in_s32.val[1])),
+ vcombine_s16(vqmovn_s32(in_s32.val[2]), vqmovn_s32(in_s32.val[3]))
+ }
+ };
+
+ // Convert S16 to U8
+ const uint8x16_t out_u8 = vcombine_u8(vqmovun_s16(in_s16.val[0]), vqmovun_s16(in_s16.val[1]));
+
+ vst1q_u8(out.ptr(), out_u8);
+ },
+ in, out);
+}
\ No newline at end of file