$ cat output-block.c
int flush_output(void)
{
return add_block();
}
$ gcc -O3 -S output-block.c
$ cat output-block.s
.file "output-block.c"
.text
.p2align 4,,15
.globl flush_output
.type flush_output, @function
flush_output:
pushl %ebp
movl %esp, %ebp
popl %ebp
jmp add_block
.size flush_output, .-flush_output
.ident "GCC: (GNU) 4.1.0 20050315 (experimental)"
.section .note.GNU-stack,"",@progbits
The operations on ebp aren't necessary.
--
Summary: unnecessary operations in tailcall
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: Thomas dot Koenig at online dot de
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20545
