On 13 May 2014, at 07:06, Alexander Burger <a...@software-lab.de> wrote:

> Basically you are implementing you own malloc(), which is still far away
> from a single-instruction push, pop or stack arithmetic.

Am I missing something? alloca() just adds an offset to the stack pointer:

#include <stdlib.h>
extern void foo(void *);
void test() {

bash-3.2$ cc -fomit-frame-pointer -fno-stack-protector -c -O3 test.c
bash-3.2$ otool -tV test.o
(__TEXT,__text) section
0000000000000000        subq    $0x68, %rsp
0000000000000004        leaq    0x4(%rsp), %rdi
0000000000000009        callq   _foo
000000000000000e        addq    $0x68, %rsp
0000000000000012        ret

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