public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "michael.collison at linaro dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/63365] New: [ARM] Incorrect copy propagation for vclz intrinsic
Date: Thu, 25 Sep 2014 05:51:00 -0000 [thread overview]
Message-ID: <bug-63365-4@http.gcc.gnu.org/bugzilla/> (raw)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63365
Bug ID: 63365
Summary: [ARM] Incorrect copy propagation for vclz intrinsic
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: michael.collison at linaro dot org
Created attachment 33558
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33558&action=edit
Test case demonstrating incorrect code generation for vclz
Compiling and executing the attached testcase at -O2 produces incorrect code
and execution results. Instead of code being generated for the vclz instruction
the compiler propagates an incorrect constant value for what it believes will
be the result of the instruction. The attached test case is part of a proposed
set of DejaGnu tests for neon intrinsics.
------------------------------------------------------------------------------
Target: arm-linux-gnueabihf
Configured with:
'/home/michael-collison/neon-intrinsic-build/snapshots/gcc.git~neon-intrinsic-christophe/configure'
--with-bugurl=https://bugs.launchpad.net/gcc-linaro
--with-mpc=/home/michael-collison/neon-intrinsic-build/builds/destdir/x86_64-unknown-linux-gnu
--with-mpfr=/home/michael-collison/neon-intrinsic-build/builds/destdir/x86_64-unknown-linux-gnu
--with-gmp=/home/michael-collison/neon-intrinsic-build/builds/destdir/x86_64-unknown-linux-gnu
--with-gnu-as --with-gnu-ld --disable-libstdcxx-pch --disable-libmudflap
--with-cloog=no --with-ppl=no --with-isl=no --disable-nls --enable-multiarch
--disable-multilib --enable-c99 --with-arch=armv7-a --with-fpu=vfpv3-d16
--with-float=hard --with-mode=thumb
--with-sysroot=/opt/linaro/sysroot-linaro_eglibc-2_19-arm-clean-linux-gnueabihf
--with-build-sysroot=/home/michael-collison/neon-intrinsic-build/sysroots/arm-clean-linux-gnueabihf
--enable-lto --enable-linker-build-id --enable-long-long
--enable-languages=c,c++,fortran,go,lto
--with-bugurl=https://bugs.launchpad.net/gcc-linaro --with-pkgversion='Linaro
GCC 2014.08' --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu
--target=arm-clean-linux-gnueabihf
--prefix=/home/michael-collison/neon-intrinsic-build/builds/destdir/x86_64-unknown-linux-gnu
Thread model: posix
gcc version 4.10.0 20140812 (experimental) (Linaro GCC 2014.08)
next reply other threads:[~2014-09-25 5:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-25 5:51 michael.collison at linaro dot org [this message]
2014-11-13 17:13 ` [Bug rtl-optimization/63365] " ramana 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-63365-4@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: link
Be 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).