Re: [boost] [review] Review of Outcome (starts Fri-19-May)

Subject: Re: [boost] [review] Review of Outcome (starts Fri-19-May)
From: Peter Dimov (lists_at_[hidden])
Date: 2017-05-19 15:15:28

VS 2015, -Ox -Ob2:

;    COMDAT ?f@@YA?AVerror_code_at_std@@XZ
_TEXT    SEGMENT
___$ReturnUdt$ = 8                    ; size = 4
?f@@YA?AVerror_code_at_std@@XZ PROC            ; f, COMDAT

    push    ebp
    mov    ebp, esp
    call 
??$_Immortalize_at_V_System_error_category_at_std@@@std@@YAAAV_System_error_category_at_0@XZ 
; std::_Immortalize<std::_System_error_category>

    mov    ecx, DWORD PTR ___$ReturnUdt$[ebp]
    mov    DWORD PTR [ecx+4], eax

    mov    eax, ecx

    mov    DWORD PTR [ecx], 5

    pop    ebp
    ret    0

That's update 3 though, things may have been different in u0..u2.

-----Original Message----- 
From: Peter Dimov via Boost
Sent: Friday, May 19, 2017 18:01
To: boost_at_[hidden]
Cc: Peter Dimov
Subject: Re: [boost] [review] Review of Outcome (starts Fri-19-May)

Although that's VS 2017, and godbolt.org doesn't have 15. :-/

-----Original Message----- 
From: Peter Dimov via Boost
Sent: Friday, May 19, 2017 17:59
To: boost_at_[hidden]
Cc: Peter Dimov
Subject: Re: [boost] [review] Review of Outcome (starts Fri-19-May)

> Would be nice if we could see that demonstrated on godbolt.org.

https://godbolt.org/g/QeHRpl

std::error_code f()
{
  return std::error_code( 5, std::system_category() );
}

->

___$ReturnUdt$ = 8                                  ; size = 4
f PROC
        call     std::_Immortalize<std::_System_error_category>
        mov      ecx, DWORD PTR ___$ReturnUdt$[esp-4]
        mov      DWORD PTR [ecx+4], eax
        mov      eax, ecx
        mov      DWORD PTR [ecx], 5
        ret      0
f ENDP

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