public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/55549] New: zero_extend and vectors Date: Fri, 30 Nov 2012 14:29:00 -0000 [thread overview] Message-ID: <bug-55549-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55549 Bug #: 55549 Summary: zero_extend and vectors Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: enhancement Priority: P3 Component: rtl-optimization AssignedTo: unassigned@gcc.gnu.org ReportedBy: glisse@gcc.gnu.org Hello, the documentation of zero_extend says: @findex zero_extend @item (zero_extend:@var{m} @var{x}) Represents the result of zero-extending the value @var{x} to machine mode @var{m}. @var{m} must be a fixed-point mode and @var{x} a fixed-point value of a mode narrower than @var{m}. However, try_combine will happily call: SUBST (*split, gen_rtx_ZERO_EXTEND (split_mode, SUBREG_REG (*split))); without many checks. In particular, in PR54855, it tries: (zero_extend:V2DF (mem/u/c:DF ...)) It isn't a bug because nothing will recognize this pattern and it will be rejected, but it seems it would be good to add a few conditions.
next reply other threads:[~2012-11-30 14:29 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-11-30 14:29 glisse at gcc dot gnu.org [this message] 2021-08-22 8:59 ` [Bug rtl-optimization/55549] " pinskia at gcc dot gnu.org 2021-08-23 15:32 ` segher at gcc dot gnu.org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-55549-4@http.gcc.gnu.org/bugzilla/ \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).