libstdc++: Optimize std::optional default constructor

The attached patch changes the code generated for

std::optional<std::array<int,1024>>f(){return{};}

from

        movq    $0, (%rdi)
        movq    %rdi, %r8
        leaq    8(%rdi), %rdi
        xorl    %eax, %eax
        movq    $0, 4084(%rdi)
        movq    %r8, %rcx
        andq    $-8, %rdi
        subq    %rdi, %rcx
        addl    $4100, %ecx
        shrl    $3, %ecx
        rep stosq
        movq    %r8, %rax

or with different tuning

        subq    $8, %rsp
        movl    $4100, %edx
        xorl    %esi, %esi
        call    memset
        addq    $8, %rsp

to the much shorter

        movb    $0, 4096(%rdi)
        movq    %rdi, %rax

i.e. the same as the nullopt constructor.

The constructor was already non-trivial, so we don't lose that. It passes the
testsuite without regression, but there is no new testcase to verify the
better codegen.

libstdc++-v3/ChangeLog:

	* include/std/optional (optional()): Explicitly define it.

diff --git a/libstdc++-v3/include/std/optional b/libstdc++-v3/include/std/optional
index b0184a4..923d45a 100644 (file)
--- a/libstdc++-v3/include/std/optional
+++ b/libstdc++-v3/include/std/optional
@@ -687,7 +687,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     public:
       using value_type = _Tp;
 
-      constexpr optional() = default;
+      constexpr optional() noexcept { }
 
       constexpr optional(nullopt_t) noexcept { }