Package: gcc-4.6
Version: 4.6.1-1
Severity: normal
File: /usr/bin/gcc-4.6
I first encountered this problem in gcc-4.5; it also exists in gcc-4.6, but
not in gcc-4.4.
I have stripped the source file to be as small as possible while still
exhibiting the bug. Attached is the resulting preprocessor output file
(stripped-bug.i).
Here is the command-line invocation:
% gcc-4.6 -v -save-temps -O -maltivec -Wall -c -o stripped-bug.o stripped-bug.c
Using built-in specs.
COLLECT_GCC=gcc-4.6
COLLECT_LTO_WRAPPER=/usr/lib/powerpc-linux-gnu/gcc/powerpc-linux-gnu/4.6.1/lto-wrapper
Target: powerpc-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++ --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-multiarch
--with-multiarch-defaults=powerpc-linux-gnu --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib/powerpc-linux-gnu
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib/powerpc-linux-gnu
--enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-plugin --enable-objc-gc --enable-secureplt
--disable-softfloat --enable-targets=powerpc-linux,powerpc64-linux
--with-cpu=default32 --with-long-double-128 --enable-checking=release
--build=powerpc-linux-gnu --host=powerpc-linux-gnu --target=powerpc-linux-gnu
Thread model: posix
gcc version 4.6.1 (Debian 4.6.1-1)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O' '-maltivec' '-Wall' '-c' '-o'
'stripped-bug.o'
/usr/lib/powerpc-linux-gnu/gcc/powerpc-linux-gnu/4.6.1/cc1 -E -quiet -v
-D__unix__ -D__gnu_linux__ -D__linux__ -Dunix -D__unix -Dlinux -D__linux
-Asystem=linux -Asystem=unix -Asystem=posix stripped-bug.c -msecure-plt
-maltivec -Wall -O -fpch-preprocess -o stripped-bug.i
ignoring nonexistent directory "/usr/local/include/powerpc-linux-gnu"
ignoring nonexistent directory
"/usr/lib/powerpc-linux-gnu/gcc/powerpc-linux-gnu/4.6.1/../../../../../powerpc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/powerpc-linux-gnu/gcc/powerpc-linux-gnu/4.6.1/include
/usr/local/include
/usr/lib/powerpc-linux-gnu/gcc/powerpc-linux-gnu/4.6.1/include-fixed
/usr/include/powerpc-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O' '-maltivec' '-Wall' '-c' '-o'
'stripped-bug.o'
/usr/lib/powerpc-linux-gnu/gcc/powerpc-linux-gnu/4.6.1/cc1 -fpreprocessed
stripped-bug.i -msecure-plt -quiet -dumpbase stripped-bug.c -maltivec
-auxbase-strip stripped-bug.o -O -Wall -version -o stripped-bug.s
GNU C (Debian 4.6.1-1) version 4.6.1 (powerpc-linux-gnu)
compiled by GNU C version 4.6.1, GMP version 5.0.1, MPFR version
3.0.1-p3, MPC version 0.9
warning: MPFR header version 3.0.1-p3 differs from library version 3.0.0-p3.
warning: MPC header version 0.9 differs from library version 0.8.2.
GGC heuristics: --param ggc-min-expand=45 --param ggc-min-heapsize=28183
GNU C (Debian 4.6.1-1) version 4.6.1 (powerpc-linux-gnu)
compiled by GNU C version 4.6.1, GMP version 5.0.1, MPFR version
3.0.1-p3, MPC version 0.9
warning: MPFR header version 3.0.1-p3 differs from library version 3.0.0-p3.
warning: MPC header version 0.9 differs from library version 0.8.2.
GGC heuristics: --param ggc-min-expand=45 --param ggc-min-heapsize=28183
Compiler executable checksum: 0a3936a9a0e3014789e4bd021bed0af1
stripped-bug.c: In function ‘foo’:
stripped-bug.c:17:1: internal compiler error: in trunc_int_for_mode, at
explow.c:56
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.
-- System Information:
Debian Release: 6.0.2
APT prefers stable
APT policy: (990, 'stable'), (500, 'stable-updates'), (500, 'unstable')
Architecture: powerpc (ppc64)
Kernel: Linux 2.6.32-5-powerpc64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages gcc-4.6 depends on:
ii binutils 2.21.52.20110606-2 The GNU assembler, linker and bina
ii cpp-4.6 4.6.1-1 GNU C preprocessor
ii gcc-4.6-base 4.6.1-1 GCC, the GNU Compiler Collection (
ii libc6 2.11.2-10 Embedded GNU C Library: Shared lib
ii libcloog-ppl0 0.15.9-3 the Chunky Loop Generator (runtime
ii libgcc1 1:4.6.1-1 GCC support library
ii libgmp10 2:5.0.1+dfsg-7 Multiprecision arithmetic library
ii libgmpxx4ldbl 2:5.0.1+dfsg-7 Multiprecision arithmetic library
ii libgomp1 4.6.1-1 GCC OpenMP (GOMP) support library
ii libmpc2 0.8.2-1+b1 multiple precision complex floatin
ii libmpfr4 3.0.0-2 multiple precision floating-point
ii libppl-c4 0.11.2-3 Parma Polyhedra Library (C interfa
ii libppl9 0.11.2-3 Parma Polyhedra Library (runtime l
ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime
Versions of packages gcc-4.6 recommends:
ii libc6-dev 2.11.2-10 Embedded GNU C Library: Developmen
Versions of packages gcc-4.6 suggests:
pn binutils-gold <none> (no description available)
pn gcc-4.6-doc <none> (no description available)
pn gcc-4.6-locales <none> (no description available)
ii gcc-4.6-multilib 4.6.1-1 GNU C compiler (multilib files)
pn libgcc1-dbg <none> (no description available)
pn libgomp1-dbg <none> (no description available)
pn libmudflap0-4.6-dev <none> (no description available)
pn libmudflap0-dbg <none> (no description available)
pn libquadmath-dbg <none> (no description available)
-- no debconf information
# 1 "stripped-bug.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "stripped-bug.c"
int foo(void)
{
__attribute__((altivec(vector__))) unsigned a, b, c;
unsigned k = 1;
a = (__attribute__((altivec(vector__))) unsigned) { 0, 0, 0, 1 };
b = c = (__attribute__((altivec(vector__))) unsigned) { 0, 0, 0, 0 };
a = __builtin_vec_add(a, __builtin_vec_splats(k));
b = __builtin_vec_add(b, a);
c = __builtin_vec_sel(c, a, b);
if (__builtin_vec_vcmpeq_p(1, b, c))
return 1;
return 0;
}
