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6429 siemargl 1 
/* ---------------------------------------------- */
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/* alloca86_64.S */
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.globl __bound_alloca
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__bound_alloca:
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#ifdef TCC_TARGET_PE
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    # bound checking is not implemented
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    pop     %rdx
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    mov     %rcx,%rax
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    add     $15,%rax
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    and     $-16,%rax
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    jz      p3
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p1:
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    cmp     $4096,%rax
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    jbe     p2
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    test    %rax,-4096(%rsp)
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    sub     $4096,%rsp
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    sub     $4096,%rax
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    jmp p1
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p2:
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    sub     %rax,%rsp
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    mov     %rsp,%rax
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    add     $32,%rax
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p3:
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    push    %rdx
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    ret
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#else
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    pop     %rdx
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    mov     %rdi,%rax
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    movl    %rax,%rsi	# size, a second parm to the __bound_new_region
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    add     $15,%rax
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    and     $-16,%rax
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    jz      p3
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    sub     %rax,%rsp
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    mov     %rsp,%rdi	# pointer, a first parm to the __bound_new_region
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    mov     %rsp,%rax
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    push    %rdx
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    push    %rax
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    call   __bound_new_region
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    pop     %rax
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    pop     %rdx
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p3:
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    push    %rdx
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    ret
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#endif
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/* mark stack as nonexecutable */
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#if defined __ELF__ && defined __linux__
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    .section    .note.GNU-stack,"",@progbits
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#endif
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/* ---------------------------------------------- */