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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/105778] Shift by register --- unnecessary AND instruction
Date: Tue, 31 May 2022 18:53:36 +0000 [thread overview]
Message-ID: <bug-105778-4-bCxhT4007k@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-105778-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105778
--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #4)
> It is the same thing done a few lines later in the preexisting code too.
> Shall I all of those change to gen_lowpart (QImode, force_reg (GET_MODE
> (operands[2]), operands[2])) then?
Yes, please. A "register_operand" predicate accepts SUBREGs of some strange
mode (usually FP mode) registers, and gen_lowpart chokes on these.
next prev parent reply other threads:[~2022-05-31 18:53 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-30 21:21 [Bug target/105778] New: Rotate " zero at smallinteger dot com
2022-05-30 22:42 ` [Bug target/105778] Shift " jakub at gcc dot gnu.org
2022-05-31 13:19 ` jakub at gcc dot gnu.org
2022-05-31 13:44 ` ubizjak at gmail dot com
2022-05-31 13:50 ` jakub at gcc dot gnu.org
2022-05-31 14:41 ` jakub at gcc dot gnu.org
2022-05-31 18:53 ` ubizjak at gmail dot com [this message]
2022-06-02 8:41 ` cvs-commit at gcc dot gnu.org
2022-06-02 8:44 ` jakub at gcc dot gnu.org
2022-10-24 17:44 ` pinskia at gcc dot gnu.org
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