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Description
| Bugzilla Link | 31994 |
| Version | trunk |
| OS | Linux |
Extended Description
#include <string>
std::string foo() {
return std::to_string(5u);
}$ clang++ -S -O3 -std=c++14foo[abi:cxx11](): # @foo[abi:cxx11]()
push rbx
mov rbx, rdi
mov esi, vsnprintf
mov edx, 16
mov ecx, .L.str
mov r8d, 5
xor eax, eax
call __gnu_cxx::__to_xstring(int (*)(char*, unsigned long, char const*, __va_list_tag*), unsigned long, char const*, ...)
mov rax, rbx
pop rbx
retThere was a post on the libstdc++ mailing list about this some time ago. They recommended better optimization of the vsnprintf builtin:
https://gcc.gnu.org/ml/libstdc++/2015-01/msg00007.html
When using the specialized to_string implementation from VisualC's STL gcc and clang are perfectly able to figure out the string constant.
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Issues migrated from bugzillaIssues migrated from bugzillaResolved as invalid, i.e. not a bugResolved as invalid, i.e. not a bugGNU libstdc++ C++ standard libraryGNU libstdc++ C++ standard library