From: Eric Botcazou <botcazou@adacore.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: gcc-patches@gcc.gnu.org, Uros Bizjak <ubizjak@gmail.com>
Subject: Re: [PATCH] x86: Replace ne:CCC/ne:CCO with UNSPEC_CC_NE in neg patterns
Date: Fri, 28 Oct 2022 19:58:45 +0200 [thread overview]
Message-ID: <4448210.LvFx2qVVIh@fomalhaut> (raw)
In-Reply-To: <CAMe9rOpP6aAF8BT+p+dq=58rU9w1sV_AWkX3Ebe=AfXfDtgcEQ@mail.gmail.com>
> COMPARE may also set CC register to a constant when both operands are
> known constants.
No, a COMPARE is never evaluated alone, only the CC user may be evaluated.
--
Eric Botcazou
next prev parent reply other threads:[~2022-10-28 17:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-26 18:58 H.J. Lu
2022-10-27 6:06 ` Uros Bizjak
2022-10-28 5:56 ` Hongtao Liu
2022-10-28 6:08 ` Hongtao Liu
2022-10-28 8:35 ` Eric Botcazou
2022-10-28 15:51 ` H.J. Lu
2022-10-28 17:58 ` Eric Botcazou [this message]
2022-10-28 21:43 ` Segher Boessenkool
2022-10-28 21:55 ` Eric Botcazou
2022-11-01 20:34 ` Segher Boessenkool
2022-11-01 21:28 ` Eric Botcazou
2022-10-28 21:32 ` Segher Boessenkool
2022-10-28 22:28 ` H.J. Lu
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