From: Matthias Kretz <m.kretz@gsi.de>
Date: Sat, 14 Jan 2023 22:32:38 +0000 (+0100)
Subject: libstdc++: Simplify three helper functions into one
X-Git-Tag: releases/gcc-12.3.0~316
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8e171d840584a564993201101cd1f2e920e7aecb;p=thirdparty%2Fgcc.git

libstdc++: Simplify three helper functions into one

Broadcast is a very common function. This should reduce compile-time
effort.

Signed-off-by: Matthias Kretz <m.kretz@gsi.de>

libstdc++-v3/ChangeLog:

	PR libstdc++/108030
	* include/experimental/bits/simd.h (__vector_broadcast):
	Implement via __vector_broadcast_impl instead of
	__call_with_n_evaluations + 2 lambdas.
	(__vector_broadcast_impl): New.

(cherry picked from commit 2e29e2fbeb8936e5c85cefaf547cba42e17e137b)
---

diff --git a/libstdc++-v3/include/experimental/bits/simd.h b/libstdc++-v3/include/experimental/bits/simd.h
index 7bdda6e6aae3..7c5a32f6e95a 100644
--- a/libstdc++-v3/include/experimental/bits/simd.h
+++ b/libstdc++-v3/include/experimental/bits/simd.h
@@ -1792,14 +1792,15 @@ template <typename _Tp, typename... _Args>
 
 // }}}
 // __vector_broadcast{{{
+template <size_t _Np, typename _Tp, size_t... _I>
+  _GLIBCXX_SIMD_INTRINSIC constexpr __vector_type_t<_Tp, _Np>
+  __vector_broadcast_impl(_Tp __x, index_sequence<_I...>)
+  { return __vector_type_t<_Tp, _Np>{((void)_I, __x)...}; }
+
 template <size_t _Np, typename _Tp>
   _GLIBCXX_SIMD_INTRINSIC constexpr __vector_type_t<_Tp, _Np>
   __vector_broadcast(_Tp __x)
-  {
-    return __call_with_n_evaluations<_Np>(
-      [](auto... __xx) { return __vector_type_t<_Tp, _Np>{__xx...}; },
-      [&__x](int) { return __x; });
-  }
+  { return __vector_broadcast_impl<_Np, _Tp>(__x, make_index_sequence<_Np>()); }
 
 // }}}
 // __generate_vector{{{