https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87732
Bug ID: 87732
Summary: Detect and eliminate unnecessary alloc/free pairs
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: [email protected]
Target Milestone: ---
[code]
void foo()
{
char* c = new char[4];
delete[] c;
}
[/code]
gcc with -O3 generates this:
[asm]
foo():
sub rsp, 8
mov edi, 4
call operator new[](unsigned long)
add rsp, 8
mov rdi, rax
jmp operator delete[](void*)
[/asm]
clang 7.0.0 is able to remove unnecessary alloc/free pair:
[asm]
foo(): # @foo()
ret
[/asm]
Please do similar thing in gcc too.
