From c74e83f433f56aa88465486c5be185369142e61e Mon Sep 17 00:00:00 2001
From: Reilly Grant <reillyg@google.com>
Date: Wed, 25 Feb 2026 00:18:33 +0000
Subject: [PATCH] [M-146] Use std::ptrdiff_t for matrix dimensions and indices.

(Cherry-picked from 8a21714c60bdf0aa95405404e7322e455a34de72.)

PiperOrigin-RevId: 868743667
Bug: 482875307
Change-Id: I9de8e25ff4d22ff99bd63ad1573cfcc8d2aba990
---

diff --git a/ruy/mat.h b/ruy/mat.h
index c2254f9..520d717 100644
--- a/ruy/mat.h
+++ b/ruy/mat.h
@@ -328,7 +328,7 @@
 }
 
 inline std::ptrdiff_t FlatSize(const MatLayout& layout) {
-  const int outerdim =
+  const std::ptrdiff_t outerdim =
       layout.order == Order::kColMajor ? layout.cols : layout.rows;
   return layout.stride * outerdim;
 }
diff --git a/ruy/pack_avx2_fma.cc b/ruy/pack_avx2_fma.cc
index 2564b72..116854b 100644
--- a/ruy/pack_avx2_fma.cc
+++ b/ruy/pack_avx2_fma.cc
@@ -13,6 +13,7 @@
 limitations under the License.
 ==============================================================================*/
 
+#include <cstddef>
 #include <cstdint>
 #include <cstring>
 
@@ -595,9 +596,9 @@
       src_ptr, zerobuf, src_stride, remaining_src_cols, src_rows, packed_ptr,
       trailing_buf);
 
-  const int trailing_rows = src_rows & (kPackRows - 1);
+  const std::ptrdiff_t trailing_rows = src_rows & (kPackRows - 1);
   if (trailing_rows > 0) {
-    const int non_trailing_rows = src_rows & ~(kPackRows - 1);
+    const std::ptrdiff_t non_trailing_rows = src_rows & ~(kPackRows - 1);
     memcpy(packed_ptr + kPackCols * non_trailing_rows, trailing_buf,
            kPackCols * trailing_rows * sizeof(float));
   }