Bug#762028: gcc-4.7: internal compiler error: in prepare_cmp_insn, at optabs.c:4092

[Anye Li <ali@ll.mit.edu>]

Package: gcc-4.7
Version: 4.7.2-5
Severity: important

Dear Maintainer,

I managed to crash gcc using some of its vectorization builtins.
Precompiled source attached.  I did not test upstream; sorry, they
don't pay me to do that.

Cheers,
Anye Li

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-- System Information:
Debian Release: 7.6
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-4-amd64 (SMP w/8 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-4.7 depends on:
ii  binutils      2.22-8
ii  cpp-4.7       4.7.2-5
ii  gcc-4.7-base  4.7.2-5
ii  libc6         2.13-38+deb7u4
ii  libgcc1       1:4.7.2-5
ii  libgmp10      2:5.0.5+dfsg-2
ii  libgomp1      4.7.2-5
ii  libitm1       4.7.2-5
ii  libmpc2       0.9-4
ii  libmpfr4      3.1.0-5
ii  libquadmath0  4.7.2-5
ii  zlib1g        1:1.2.7.dfsg-13

Versions of packages gcc-4.7 recommends:
ii  libc6-dev  2.13-38+deb7u4

Versions of packages gcc-4.7 suggests:
pn  binutils-gold        <none>
pn  gcc-4.7-doc          <none>
pn  gcc-4.7-locales      <none>
ii  gcc-4.7-multilib     4.7.2-5
ii  libcloog-ppl0        0.15.11-4
pn  libgcc1-dbg          <none>
pn  libgomp1-dbg         <none>
pn  libitm1-dbg          <none>
pn  libmudflap0-4.7-dev  <none>
pn  libmudflap0-dbg      <none>
pn  libppl-c2            <none>
pn  libppl7              <none>
pn  libquadmath0-dbg     <none>

-- no debconf information

// /usr/lib/gcc/x86_64-linux-gnu/4.7/cc1 -quiet -imultiarch x86_64-linux-gnu crash.c -quiet -dumpbase crash.c -mtune=generic -march=x86-64 -auxbase crash -O3 -o - -frandom-seed=0
# 1 "crash.c"
# 1 "<command-line>"
# 1 "crash.c"
typedef float v4sf __attribute__ ((vector_size(16)));
typedef int v4si __attribute__ ((vector_size(16)));

void vcabsf8(int n, v4sf *a, const v4sf (*x)[2]) {




 int i,j;
 v4si i0={0,2,4,6},i1={1,3,5,7};
 v4sf z={0.0f,0.0f,0.0f,0.0f},o={1.0f,1.0f,1.0f,1.0f},
      sgn={-1.0f,1.0f},sel={0.0f,1.0f},
      xr,xi,p,q,r,s;
 for (i=0;i<n;++i) {
  xr=__builtin_shuffle(x[i][0],x[i][1],i0);
  xi=__builtin_shuffle(x[i][0],x[i][1],i1);

  xr*=__builtin_shuffle(sgn,1+(xr<z));
  xi*=__builtin_shuffle(sgn,1+(xi<z));





  s=__builtin_shuffle(sel,1+(xi<xr));
  r=o-s;

  p=s*xr+r*xi;

  q=r*xr+s*xi;




  for (j=0;j<3;++j) {
   r=q/p; r*=r;
   s=r/(4.0f+r);
   p+=2*s*p;
   q*=s;
  }
  a[i]=p;
 }
}