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* [gcc r11-3501] libstdc++: Reduce the size of an unbounded iota_view
@ 2020-09-28 16:05 Patrick Palka
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From: Patrick Palka @ 2020-09-28 16:05 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:623443357e6092067b4cf98cc6c0aeff7560b98d
commit r11-3501-g623443357e6092067b4cf98cc6c0aeff7560b98d
Author: Patrick Palka <ppalka@redhat.com>
Date: Mon Sep 28 11:54:57 2020 -0400
libstdc++: Reduce the size of an unbounded iota_view
libstdc++-v3/ChangeLog:
* include/std/ranges (iota_view::_M_bound): Give it
[[no_unique_address]].
* testsuite/std/ranges/iota/iota_view.cc: Check that an
unbounded iota_view has minimal size.
Diff:
---
libstdc++-v3/include/std/ranges | 2 +-
libstdc++-v3/testsuite/std/ranges/iota/iota_view.cc | 3 +++
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
index ed04fa0001d..964a2b616a6 100644
--- a/libstdc++-v3/include/std/ranges
+++ b/libstdc++-v3/include/std/ranges
@@ -511,7 +511,7 @@ namespace ranges
};
_Winc _M_value = _Winc();
- _Bound _M_bound = _Bound();
+ [[no_unique_address]] _Bound _M_bound = _Bound();
public:
iota_view() = default;
diff --git a/libstdc++-v3/testsuite/std/ranges/iota/iota_view.cc b/libstdc++-v3/testsuite/std/ranges/iota/iota_view.cc
index 65d166fbd3b..8a33e10a093 100644
--- a/libstdc++-v3/testsuite/std/ranges/iota/iota_view.cc
+++ b/libstdc++-v3/testsuite/std/ranges/iota/iota_view.cc
@@ -77,6 +77,9 @@ test04()
VERIFY( it == v.end() );
}
+// Verify we optimize away the 'bound' data member of an unbounded iota_view.
+static_assert(sizeof(std::ranges::iota_view<char>) == 1);
+
int
main()
{
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