This also happens with sparc-sun-solaris2.8 4.1.2
a.cc:
struct buffer {
char buf[65536];
};
buffer *makeBuffer() {
return new buffer();
}
end of a.cc
g++ -O2 -S a.cc
a.s:
....
movl $65536, (%esp)
call _Znwj
movl %eax, %ebx
movl %ebx, %edx
movl $65536, %eax
movl %eax, 8(%esp)
movl $0, 4(%esp)
movl %edx, (%esp)
call memset
....
Give buffer a default constructor and the memset call disappears.
b.cc:
struct buffer {
char buf[65536];
buffer() {}
};
buffer *makeBuffer() {
return new buffer();
}
end of b.cc
g++ -O2 -S b.cc
b.s:
...
movl $65536, (%esp)
call _Znwj
leave
ret
...
--
Summary: Unwanted memset in default constructor
Product: gcc
Version: 3.4.6
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: kbateman at seicorp dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33401
