Revert D37670913 "[fbgemm] Use std::fma in tail of Fused8BitRowwiseQu…

…antizedSBFloatToFloatOrHalfAvx2" (pytorch#1222) Summary: Pull Request resolved: pytorch#1222 Reviewed By: Liang-Dong Differential Revision: D38155592 fbshipit-source-id: 025fc4445029a104fe38e76ad317a2e0dfb6ede7
williamwen42 · Jul 28, 2022 · 4812758 · 4812758
1 parent cca200c
commit 4812758
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/QuantUtilsAvx2.cc b/src/QuantUtilsAvx2.cc
@@ -2164,8 +2164,8 @@ void Fused8BitRowwiseQuantizedSBFloatToFloatOrHalfAvx2(
     }
 
     for (; col < output_columns; ++col) {
-      float output_value = std::fma(
-          input_row[col], input_row_scale_bias[0], input_row_scale_bias[1]);
+      float output_value =
+          input_row[col] * input_row_scale_bias[0] + input_row_scale_bias[1];
       if (std::is_same<OutputType, float>()) {
         output_row[col] = output_value;
       } else {