[Bug c++/60202] New: < 128 alignment for vector<T> data where T has a member with alignas(128)

[Bug c++/60202] New: < 128 alignment for vector<T> data where T has a member with alignas(128)

[ilja.honkonen at helsinki dot fi]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60202

            Bug ID: 60202
           Summary: < 128 alignment for vector<T> data where T has a
                    member with alignas(128)
           Product: gcc
           Version: 4.8.2
               URL: http://listengine.tuxfamily.org/lists.tuxfamily.org/ei
                    gen/2014/02/msg00033.html
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ilja.honkonen at helsinki dot fi
            Target: x86_64-redhat-linux

gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.2/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla
--enable-bootstrap --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-gnu-unique-object
--enable-linker-build-id --with-linker-hash-style=gnu
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin
--enable-initfini-array --enable-java-awt=gtk --disable-dssi
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib
--with-isl=/builddir/build/BUILD/gcc-4.8.2-20131212/obj-x86_64-redhat-linux/isl-install
--with-cloog=/builddir/build/BUILD/gcc-4.8.2-20131212/obj-x86_64-redhat-linux/cloog-install
--with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Säiemalli: posix
gcc-versio 4.8.2 20131212 (Red Hat 4.8.2-7) (GCC)

Command line: g++ -std=c++0x -W -Wall -Wextra -pedantic -O3 testi.cpp -o testi
where testi.cpp is http://ideone.com/XpgXyG and is also attached.

No compiler output to stdout.

Example of program output:

Address 0x7fffeb791c80 is 128 bytes aligned.
Address 0x7fffeb791d00 is 256 bytes aligned.
Address 0xafa010 is 16 bytes aligned.
Address 0xafa0a0 is 32 bytes aligned.
Address 0xafa1b0 is 16 bytes aligned.
Address 0xafa6c0 is 64 bytes aligned.

Shouldn't all of the printed addresses be at least 128 byte aligned or
compilation should fail?
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From: "ilja.honkonen at helsinki dot fi" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/60202] < 128 alignment for vector<T> data where T has a member with alignas(128)
Date: Fri, 14 Feb 2014 18:13:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`202

--- Comment #2 from ilja.honkonen at helsinki dot fi ---
Created attachment 32138
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id2138&actioníit
saved temp

[Bug c++/60202] < 128 alignment for vector<T> data where T has a member with alignas(128)

[ilja.honkonen at helsinki dot fi]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60202

--- Comment #1 from ilja.honkonen at helsinki dot fi ---
Created attachment 32137
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32137&action=edit
source

[Bug c++/60202] < 128 alignment for vector<T> data where T has a member with alignas(128)

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60202

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
We don't have a operator new which supports alignas yet.
http://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/2014/02/msg00033.html