Refactor DWCONV micro-kernels

- Fix bugs in generation of micro-kernels with large channel tiles
- Add missing unit tests
- Generate, test, and benchmark a microkernels with 2 accumulators, with 2X
  channel tile, and their combinations

PiperOrigin-RevId: 279137161
diff --git a/src/f32-dwconv/up2x25-scalar.c b/src/f32-dwconv/up2x25-scalar.c
new file mode 100644
index 0000000..57b5e47
--- /dev/null
+++ b/src/f32-dwconv/up2x25-scalar.c
@@ -0,0 +1,391 @@
+// Auto-generated file. Do not edit!
+//   Template: src/f32-dwconv/up-scalar.c.in
+//   Generator: tools/xngen
+//
+// Copyright 2019 Google LLC
+//
+// This source code is licensed under the BSD-style license found in the
+// LICENSE file in the root directory of this source tree.
+
+#include <assert.h>
+
+#include <xnnpack/dwconv.h>
+#include <xnnpack/math.h>
+
+
+void xnn_f32_dwconv_ukernel_up2x25__scalar(
+    size_t channels,
+    size_t output_width,
+    const float** input,
+    const float* weights,
+    float* output,
+    size_t input_stride,
+    size_t output_increment,
+    const union xnn_f32_output_params params[restrict static 1])
+{
+  assert(channels != 0);
+  assert(output_width != 0);
+
+  const float vmin = params->scalar.min;
+  const float vmax = params->scalar.max;
+  do {
+    const float* i0 = input[0];
+    const float* i1 = input[1];
+    const float* i2 = input[2];
+    const float* i3 = input[3];
+    const float* i4 = input[4];
+    const float* i5 = input[5];
+    const float* i6 = input[6];
+    const float* i7 = input[7];
+    const float* i8 = input[8];
+    const float* i9 = input[9];
+    const float* i10 = input[10];
+    const float* i11 = input[11];
+    const float* i12 = input[12];
+    const float* i13 = input[13];
+    const float* i14 = input[14];
+    const float* i15 = input[15];
+    const float* i16 = input[16];
+    const float* i17 = input[17];
+    const float* i18 = input[18];
+    const float* i19 = input[19];
+    const float* i20 = input[20];
+    const float* i21 = input[21];
+    const float* i22 = input[22];
+    const float* i23 = input[23];
+    const float* i24 = input[24];
+    input = (const float**) ((uintptr_t) input + input_stride);
+
+    size_t c = channels;
+    const float* w = weights;
+    for (; c >= 2; c -= 2) {
+      float vacc0p0 = w[0];
+      float vacc1p0 = w[1];
+
+
+      const float vi0x0 = i0[0];
+      const float vi0x1 = i0[1];
+      i0 += 2;
+
+      const float vk0x0 = w[2];
+      vacc0p0 += vi0x0 * vk0x0;
+      const float vk0x1 = w[3];
+      vacc1p0 += vi0x1 * vk0x1;
+
+      const float vi1x0 = i1[0];
+      const float vi1x1 = i1[1];
+      i1 += 2;
+
+      const float vk1x0 = w[4];
+      vacc0p0 += vi1x0 * vk1x0;
+      const float vk1x1 = w[5];
+      vacc1p0 += vi1x1 * vk1x1;
+
+      const float vi2x0 = i2[0];
+      const float vi2x1 = i2[1];
+      i2 += 2;
+
+      const float vk2x0 = w[6];
+      vacc0p0 += vi2x0 * vk2x0;
+      const float vk2x1 = w[7];
+      vacc1p0 += vi2x1 * vk2x1;
+
+      const float vi3x0 = i3[0];
+      const float vi3x1 = i3[1];
+      i3 += 2;
+
+      const float vk3x0 = w[8];
+      vacc0p0 += vi3x0 * vk3x0;
+      const float vk3x1 = w[9];
+      vacc1p0 += vi3x1 * vk3x1;
+
+      const float vi4x0 = i4[0];
+      const float vi4x1 = i4[1];
+      i4 += 2;
+
+      const float vk4x0 = w[10];
+      vacc0p0 += vi4x0 * vk4x0;
+      const float vk4x1 = w[11];
+      vacc1p0 += vi4x1 * vk4x1;
+
+      const float vi5x0 = i5[0];
+      const float vi5x1 = i5[1];
+      i5 += 2;
+
+      const float vk5x0 = w[12];
+      vacc0p0 += vi5x0 * vk5x0;
+      const float vk5x1 = w[13];
+      vacc1p0 += vi5x1 * vk5x1;
+
+      const float vi6x0 = i6[0];
+      const float vi6x1 = i6[1];
+      i6 += 2;
+
+      const float vk6x0 = w[14];
+      vacc0p0 += vi6x0 * vk6x0;
+      const float vk6x1 = w[15];
+      vacc1p0 += vi6x1 * vk6x1;
+
+      const float vi7x0 = i7[0];
+      const float vi7x1 = i7[1];
+      i7 += 2;
+
+      const float vk7x0 = w[16];
+      vacc0p0 += vi7x0 * vk7x0;
+      const float vk7x1 = w[17];
+      vacc1p0 += vi7x1 * vk7x1;
+
+      const float vi8x0 = i8[0];
+      const float vi8x1 = i8[1];
+      i8 += 2;
+
+      const float vk8x0 = w[18];
+      vacc0p0 += vi8x0 * vk8x0;
+      const float vk8x1 = w[19];
+      vacc1p0 += vi8x1 * vk8x1;
+
+      const float vi9x0 = i9[0];
+      const float vi9x1 = i9[1];
+      i9 += 2;
+
+      const float vk9x0 = w[20];
+      vacc0p0 += vi9x0 * vk9x0;
+      const float vk9x1 = w[21];
+      vacc1p0 += vi9x1 * vk9x1;
+
+      const float vi10x0 = i10[0];
+      const float vi10x1 = i10[1];
+      i10 += 2;
+
+      const float vk10x0 = w[22];
+      vacc0p0 += vi10x0 * vk10x0;
+      const float vk10x1 = w[23];
+      vacc1p0 += vi10x1 * vk10x1;
+
+      const float vi11x0 = i11[0];
+      const float vi11x1 = i11[1];
+      i11 += 2;
+
+      const float vk11x0 = w[24];
+      vacc0p0 += vi11x0 * vk11x0;
+      const float vk11x1 = w[25];
+      vacc1p0 += vi11x1 * vk11x1;
+
+      const float vi12x0 = i12[0];
+      const float vi12x1 = i12[1];
+      i12 += 2;
+
+      const float vk12x0 = w[26];
+      vacc0p0 += vi12x0 * vk12x0;
+      const float vk12x1 = w[27];
+      vacc1p0 += vi12x1 * vk12x1;
+
+      const float vi13x0 = i13[0];
+      const float vi13x1 = i13[1];
+      i13 += 2;
+
+      const float vk13x0 = w[28];
+      vacc0p0 += vi13x0 * vk13x0;
+      const float vk13x1 = w[29];
+      vacc1p0 += vi13x1 * vk13x1;
+
+      const float vi14x0 = i14[0];
+      const float vi14x1 = i14[1];
+      i14 += 2;
+
+      const float vk14x0 = w[30];
+      vacc0p0 += vi14x0 * vk14x0;
+      const float vk14x1 = w[31];
+      vacc1p0 += vi14x1 * vk14x1;
+
+      const float vi15x0 = i15[0];
+      const float vi15x1 = i15[1];
+      i15 += 2;
+
+      const float vk15x0 = w[32];
+      vacc0p0 += vi15x0 * vk15x0;
+      const float vk15x1 = w[33];
+      vacc1p0 += vi15x1 * vk15x1;
+
+      const float vi16x0 = i16[0];
+      const float vi16x1 = i16[1];
+      i16 += 2;
+
+      const float vk16x0 = w[34];
+      vacc0p0 += vi16x0 * vk16x0;
+      const float vk16x1 = w[35];
+      vacc1p0 += vi16x1 * vk16x1;
+
+      const float vi17x0 = i17[0];
+      const float vi17x1 = i17[1];
+      i17 += 2;
+
+      const float vk17x0 = w[36];
+      vacc0p0 += vi17x0 * vk17x0;
+      const float vk17x1 = w[37];
+      vacc1p0 += vi17x1 * vk17x1;
+
+      const float vi18x0 = i18[0];
+      const float vi18x1 = i18[1];
+      i18 += 2;
+
+      const float vk18x0 = w[38];
+      vacc0p0 += vi18x0 * vk18x0;
+      const float vk18x1 = w[39];
+      vacc1p0 += vi18x1 * vk18x1;
+
+      const float vi19x0 = i19[0];
+      const float vi19x1 = i19[1];
+      i19 += 2;
+
+      const float vk19x0 = w[40];
+      vacc0p0 += vi19x0 * vk19x0;
+      const float vk19x1 = w[41];
+      vacc1p0 += vi19x1 * vk19x1;
+
+      const float vi20x0 = i20[0];
+      const float vi20x1 = i20[1];
+      i20 += 2;
+
+      const float vk20x0 = w[42];
+      vacc0p0 += vi20x0 * vk20x0;
+      const float vk20x1 = w[43];
+      vacc1p0 += vi20x1 * vk20x1;
+
+      const float vi21x0 = i21[0];
+      const float vi21x1 = i21[1];
+      i21 += 2;
+
+      const float vk21x0 = w[44];
+      vacc0p0 += vi21x0 * vk21x0;
+      const float vk21x1 = w[45];
+      vacc1p0 += vi21x1 * vk21x1;
+
+      const float vi22x0 = i22[0];
+      const float vi22x1 = i22[1];
+      i22 += 2;
+
+      const float vk22x0 = w[46];
+      vacc0p0 += vi22x0 * vk22x0;
+      const float vk22x1 = w[47];
+      vacc1p0 += vi22x1 * vk22x1;
+
+      const float vi23x0 = i23[0];
+      const float vi23x1 = i23[1];
+      i23 += 2;
+
+      const float vk23x0 = w[48];
+      vacc0p0 += vi23x0 * vk23x0;
+      const float vk23x1 = w[49];
+      vacc1p0 += vi23x1 * vk23x1;
+
+      const float vi24x0 = i24[0];
+      const float vi24x1 = i24[1];
+      i24 += 2;
+
+      const float vk24x0 = w[50];
+      vacc0p0 += vi24x0 * vk24x0;
+      const float vk24x1 = w[51];
+      vacc1p0 += vi24x1 * vk24x1;
+
+      w += 52;
+
+
+      float vacc0 = math_max_f32(vacc0p0, vmin);
+      float vacc1 = math_max_f32(vacc1p0, vmin);
+
+      vacc0 = math_min_f32(vacc0, vmax);
+      vacc1 = math_min_f32(vacc1, vmax);
+
+      output[0] = vacc0;
+      output[1] = vacc1;
+      output += 2;
+    }
+    for (; c >= 1; c -= 1) {
+      float vacc0p0 = *w++;
+
+      const float vi0 = *i0++;
+      const float vk0 = w[1];
+      vacc0p0 += vi0 * vk0;
+      const float vi1 = *i1++;
+      const float vk1 = w[3];
+      vacc0p0 += vi1 * vk1;
+      const float vi2 = *i2++;
+      const float vk2 = w[5];
+      vacc0p0 += vi2 * vk2;
+      const float vi3 = *i3++;
+      const float vk3 = w[7];
+      vacc0p0 += vi3 * vk3;
+      const float vi4 = *i4++;
+      const float vk4 = w[9];
+      vacc0p0 += vi4 * vk4;
+      const float vi5 = *i5++;
+      const float vk5 = w[11];
+      vacc0p0 += vi5 * vk5;
+      const float vi6 = *i6++;
+      const float vk6 = w[13];
+      vacc0p0 += vi6 * vk6;
+      const float vi7 = *i7++;
+      const float vk7 = w[15];
+      vacc0p0 += vi7 * vk7;
+      const float vi8 = *i8++;
+      const float vk8 = w[17];
+      vacc0p0 += vi8 * vk8;
+      const float vi9 = *i9++;
+      const float vk9 = w[19];
+      vacc0p0 += vi9 * vk9;
+      const float vi10 = *i10++;
+      const float vk10 = w[21];
+      vacc0p0 += vi10 * vk10;
+      const float vi11 = *i11++;
+      const float vk11 = w[23];
+      vacc0p0 += vi11 * vk11;
+      const float vi12 = *i12++;
+      const float vk12 = w[25];
+      vacc0p0 += vi12 * vk12;
+      const float vi13 = *i13++;
+      const float vk13 = w[27];
+      vacc0p0 += vi13 * vk13;
+      const float vi14 = *i14++;
+      const float vk14 = w[29];
+      vacc0p0 += vi14 * vk14;
+      const float vi15 = *i15++;
+      const float vk15 = w[31];
+      vacc0p0 += vi15 * vk15;
+      const float vi16 = *i16++;
+      const float vk16 = w[33];
+      vacc0p0 += vi16 * vk16;
+      const float vi17 = *i17++;
+      const float vk17 = w[35];
+      vacc0p0 += vi17 * vk17;
+      const float vi18 = *i18++;
+      const float vk18 = w[37];
+      vacc0p0 += vi18 * vk18;
+      const float vi19 = *i19++;
+      const float vk19 = w[39];
+      vacc0p0 += vi19 * vk19;
+      const float vi20 = *i20++;
+      const float vk20 = w[41];
+      vacc0p0 += vi20 * vk20;
+      const float vi21 = *i21++;
+      const float vk21 = w[43];
+      vacc0p0 += vi21 * vk21;
+      const float vi22 = *i22++;
+      const float vk22 = w[45];
+      vacc0p0 += vi22 * vk22;
+      const float vi23 = *i23++;
+      const float vk23 = w[47];
+      vacc0p0 += vi23 * vk23;
+      const float vi24 = *i24++;
+      const float vk24 = w[49];
+      vacc0p0 += vi24 * vk24;
+
+
+      float vacc0 = math_max_f32(vacc0p0, vmin);
+      vacc0 = math_min_f32(vacc0, vmax);
+      *output++ = vacc0;
+    }
+
+    output = (float*) ((uintptr_t) output + output_increment);
+  } while (--output_width != 0);
+}