Signed requantization evaluation stubs and unit tests
PiperOrigin-RevId: 323887449
diff --git a/src/qs8-requantization/fp32-scalar-lrintf.c b/src/qs8-requantization/fp32-scalar-lrintf.c
new file mode 100644
index 0000000..29937fe
--- /dev/null
+++ b/src/qs8-requantization/fp32-scalar-lrintf.c
@@ -0,0 +1,67 @@
+// Copyright (c) Facebook, Inc. and its affiliates.
+// All rights reserved.
+//
+// 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 <math.h>
+#include <stdint.h>
+#include <stddef.h>
+
+#include <fp16/bitcasts.h>
+
+#include <xnnpack/requantization-stubs.h>
+
+
+void xnn_qs8_requantize_fp32__scalar_lrintf(
+ size_t n,
+ const int32_t* input,
+ float scale,
+ int8_t zero_point,
+ int8_t qmin,
+ int8_t qmax,
+ int8_t* output)
+{
+ assert(n % 4 == 0);
+ assert(scale < 1.0f);
+ assert(scale >= 0x1.0p-32f);
+
+ const long lmin = (long) ((int32_t) qmin - (int32_t) zero_point);
+ const long lmax = (long) ((int32_t) qmax - (int32_t) zero_point);
+ for (; n != 0; n -= 4) {
+ const int32_t x = input[0];
+ const int32_t y = input[1];
+ const int32_t z = input[2];
+ const int32_t w = input[3];
+ input += 4;
+
+ const float x_scaled = (float) x * scale;
+ const float y_scaled = (float) y * scale;
+ const float z_scaled = (float) z * scale;
+ const float w_scaled = (float) w * scale;
+
+ const long x_rounded = lrintf(x_scaled);
+ const long y_rounded = lrintf(y_scaled);
+ const long z_rounded = lrintf(z_scaled);
+ const long w_rounded = lrintf(w_scaled);
+
+ const int32_t x_clamped = (int32_t) (x_rounded < lmin ? lmin : x_rounded > lmax ? lmax : x_rounded);
+ const int32_t y_clamped = (int32_t) (y_rounded < lmin ? lmin : y_rounded > lmax ? lmax : y_rounded);
+ const int32_t z_clamped = (int32_t) (z_rounded < lmin ? lmin : z_rounded > lmax ? lmax : z_rounded);
+ const int32_t w_clamped = (int32_t) (w_rounded < lmin ? lmin : w_rounded > lmax ? lmax : w_rounded);
+
+ const int32_t x_biased = x_clamped + (int32_t) zero_point;
+ const int32_t y_biased = y_clamped + (int32_t) zero_point;
+ const int32_t z_biased = z_clamped + (int32_t) zero_point;
+ const int32_t w_biased = w_clamped + (int32_t) zero_point;
+
+ output[0] = (int8_t) x_biased;
+ output[1] = (int8_t) y_biased;
+ output[2] = (int8_t) z_biased;
+ output[3] = (int8_t) w_biased;
+ output += 4;
+ }
+}