From: Luc Grosheintz <luc.grosheintz@gmail.com>
Date: Mon, 11 Aug 2025 20:14:54 +0000 (+0200)
Subject: libstdc++: Reduce size static storage for __fwd_prod in mdspan.
X-Git-Tag: basepoints/gcc-17~5484
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d6ed0658f70144dbec0fe7c494cf7a2a11b05d2e;p=thirdparty%2Fgcc.git

libstdc++: Reduce size static storage for __fwd_prod in mdspan.

This fixes an oversight in a previous commit that improved mdspan
related code. Because __size doesn't use __fwd_prod, __fwd_prod(__rank)
is not needed anymore. Hence, one can shrink the size of
__fwd_partial_prods.

libstdc++-v3/ChangeLog:

	* include/std/mdspan (__fwd_partial_prods): Reduce size of the
	array by 1 element.

Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
Signed-off-by: Luc Grosheintz <luc.grosheintz@gmail.com>
---

diff --git a/libstdc++-v3/include/std/mdspan b/libstdc++-v3/include/std/mdspan
index 351018a59a5..8f974257e96 100644
--- a/libstdc++-v3/include/std/mdspan
+++ b/libstdc++-v3/include/std/mdspan
@@ -274,8 +274,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       constexpr auto __fwd_partial_prods = [] consteval
 	{
 	  constexpr size_t __rank = _Extents.size();
-	  std::array<size_t, __rank + 1> __ret;
-	  for(size_t __r = 0; __r < __rank + 1; ++__r)
+	  std::array<size_t, __rank> __ret;
+	  for(size_t __r = 0; __r < __rank; ++__r)
 	    __ret[__r] = __static_prod<_Extents>(0, __r);
 	  return __ret;
 	}();