Re: GCC does not generate ADCX or ADOX for _addcarryx_u64

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To: Jeffrey Walton <noloader@xxxxxxxxx>
Subject: Re: GCC does not generate ADCX or ADOX for _addcarryx_u64
From: Marc Glisse <marc.glisse@xxxxxxxx>
Date: Mon, 21 Aug 2017 13:20:44 +0200 (CEST)
Cc: "gcc-help@xxxxxxxxxxx" <gcc-help@xxxxxxxxxxx>
In-reply-to: <CAH8yC8mmsbnvgH6H63ULU69AzWOotgNHdb+s-KzrH=mwP=uX-w@mail.gmail.com>
References: <CAH8yC8mmsbnvgH6H63ULU69AzWOotgNHdb+s-KzrH=mwP=uX-w@mail.gmail.com>
Reply-to: "gcc-help@xxxxxxxxxxx" <gcc-help@xxxxxxxxxxx>
User-agent: Alpine 2.20 (DEB 67 2015-01-07)

On Mon, 21 Aug 2017, Jeffrey Walton wrote:

I'm trying to use _addcarryx_u64. GCC 7.1 is still generating ADD and
ADC instead of ADCX or ADOX:


Does that compute wrong values? Make the program slower?

--
Marc Glisse

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  - From: Jeffrey Walton

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