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[Bug middle-end/25957] -fstack-protector code on i386/x86_64 can be improved.

From: "andi-gcc at firstfloor dot org" <gcc-bugzilla at gcc dot gnu dot org>
To: gcc-bugs at gcc dot gnu dot org
Date: Sat, 08 Oct 2011 23:27:02 +0000
Subject: [Bug middle-end/25957] -fstack-protector code on i386/x86_64 can be improved.
Auto-submitted: auto-generated
References: <bug-25957-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25957

--- Comment #11 from Andi Kleen <andi-gcc at firstfloor dot org> 2011-10-08 23:27:02 UTC ---
I just checked and the problem is still there with

 4.7.0 20111002

       xorq    %fs:40, %rax
        jne     .L4
        addq    $120, %rsp
        .cfi_remember_state
        .cfi_def_cfa_offset 8
        ret
.L4:
        .cfi_restore_state
        .p2align 4,,6
        call    __stack_chk_fail
        .cfi_endproc
.LFE0:


unnecessary wasteful alignment for the call to
abort. The basic block should be marked cold.

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