https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86573
Bug ID: 86573
Summary: Failure to optimise passing simple values to inlined
function
Product: gcc
Version: tree-ssa
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: s_gccbugzilla at nedprod dot com
Target Milestone: ---
#include <string>
inline size_t calc(std::string a, std::string b)
{
return a.size() + b.size();
}
int main()
{
std::string a = "Hello world", b = "Goodbye world";
return calc(std::move(a), std::move(b));
}
This should generate:
main: # @main
mov eax, 24
ret
Like clang does. See https://godbolt.org/g/EAggKH.
But it instead generates this spew with gcc trunk:
https://godbolt.org/g/3LmfTc
Also it should generate the above return of 24 if passing by value. clang
currently fails that, I have reported a bug to them about it.
