Fix intermittant UBSAN error

Summary: Uninitialized value (even though not used in this path) was causing intermittent undefined behavior. UndefinedBehaviorSanitizer: invalid-shift-exponent deeplearning/fbgemm/src/EmbeddingSpMDMAvx512.cc:124:42 Reviewed By: jiyuanzFB Differential Revision: D31515040 fbshipit-source-id: ec17fe727da8704a6cdef1bd62ce3c0e70ec5530
joebos · Oct 12, 2021 · 9698cad · 9698cad
1 parent fc7af8f
commit 9698cad
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/EmbeddingSpMDMAvx512.cc b/src/EmbeddingSpMDMAvx512.cc
@@ -512,7 +512,7 @@ void compressed_indices_remap_avx512(
   constexpr int UNROLL_REM = 1;
   for (; k < offsets_len; ++k) {
     int32_t len[UNROLL_REM];
-    int32_t rem[UNROLL_REM];
+    int32_t rem[UNROLL_REM] = {0};
     for (int l = 0; l < UNROLL_REM; ++l) {
       len[l] = offsets[k + l] - offsets[k + l - 1];
     }