[prev in list] [next in list] [prev in thread] [next in thread] 

List:       gcc-bugs
Subject:    [Bug c/49595] New: on amd64, sizeof(__int128_t) > sizeof(intmax_t)
From:       "sandals at crustytoothpaste dot net" <gcc-bugzilla () gcc ! gnu ! org>
Date:       2011-06-30 17:19:53
Message-ID: bug-49595-4 () http ! gcc ! gnu ! org/bugzilla/
[Download RAW message or body]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49595

           Summary: on amd64, sizeof(__int128_t) > sizeof(intmax_t)
           Product: gcc
           Version: 4.6.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: sandals@crustytoothpaste.net


Created attachment 24647
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24647
Trivial testcase

The C standard (as well as POSIX) requires that intmax_t "designates a signed
integer type capable of representing any value of any signed integer type" and
likewise for uintmax_t. However, on amd64, intmax_t is long, which is not big
enough to hold a 128-bit quantity.

A trivial preprocessed testcase is attached, not that you need one. I see this
behavior on 4.6 and 4.7:

lakeview ok % gcc -v 
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.6.1/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.6.1-1'
--with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++,go --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-multiarch
--with-multiarch-defaults=x86_64-linux-gnu --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib/x86_64-linux-gnu
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib/x86_64-linux-gnu
--enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-plugin --enable-objc-gc
--with-arch-32=i586 --with-tune=generic --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.6.1 (Debian 4.6.1-1) 

lakeview ok % /usr/lib/gcc-snapshot/bin/gcc -v 
Using built-in specs.
COLLECT_GCC=/usr/lib/gcc-snapshot/bin/gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc-snapshot/libexec/gcc/x86_64-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 20110624-1'
--with-bugurl=file:///usr/share/doc/gcc-snapshot/README.Bugs
--enable-languages=c,ada,c++,java,fortran,objc,obj-c++,go
--prefix=/usr/lib/gcc-snapshot --enable-shared --enable-multiarch
--with-multiarch-defaults=x86_64-linux-gnu --enable-linker-build-id
--with-system-zlib --disable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-plugin --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.7-snap/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.7-snap
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.7-snap
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --with-arch-32=i586 --with-tune=generic --disable-werror
--enable-checking=yes --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.0 20110624 (experimental) [trunk revision 175388] (Debian
20110624-1) 

This is Debian bug #629137.
[prev in list] [next in list] [prev in thread] [next in thread]