https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78104
Bug ID: 78104
Summary: optimizer doesn't grok C++ new/delete yet
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: trippels at gcc dot gnu.org
Target Milestone: ---
A simple example:
int main() {
int *ob = new int();
delete ob;
}
clang optimizes it away:
main: # @main
xorl %eax, %eax
retq
gcc doesn't:
main:
subq $8, %rsp
movl $4, %edi
call operator new(unsigned long)
movl $4, %esi
movl $0, (%rax)
movq %rax, %rdi
call operator delete(void*, unsigned long)
xorl %eax, %eax
addq $8, %rsp
ret
