Prevent auto-vectorization of scalar tail

hazzlim · hazzlim · commit 3119a3a02a34 · 2025-12-15T12:14:01.000Z
diff --git a/stl/src/vector_algorithms.cpp b/stl/src/vector_algorithms.cpp
@@ -3363,6 +3363,7 @@ namespace {
                 _Advance_bytes(_First, sizeof(_Ty));
             }
 
+#pragma loop(no_vector)
             for (auto _Ptr = static_cast<const _Ty*>(_First); _Ptr != _Last; ++_Ptr) {
                 if constexpr ((_Mode & _Mode_min) != 0) {
                     if (*_Ptr < _Cur_min_val) {

Original file line number	Diff line number	Diff line change
`@@ -3363,6 +3363,7 @@ namespace {`
`3363`	`3363`	`_Advance_bytes(_First, sizeof(_Ty));`
`3364`	`3364`	`}`
`3365`	`3365`
	`3366`	`+#pragma loop(no_vector)`
`3366`	`3367`	`for (auto _Ptr = static_cast<const _Ty*>(_First); _Ptr != _Last; ++_Ptr) {`
`3367`	`3368`	`if constexpr ((_Mode & _Mode_min) != 0) {`
`3368`	`3369`	`if (*_Ptr < _Cur_min_val) {`