ICE with 4.6 when using neon intrinsics

[Ken Werner]

The current Linaro GCC 4.6 gets an ICE when compiling Qt in case neon support is enabled:
  gcc -fpreprocessed -c testcase.i -march=armv7-a -mfloat-abi=hard -mfpu=neon -O1
  testcase.i: In function 'foo':
  testcase.i:7:29: internal compiler error: in expand_expr_real_1, at expr.c:8936
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <http://gcc.gnu.org/bugs.html> for instructions.

Here's a reduced testcase (thanks Uli):
  $ cat testcase.i
  void foo (void)
  {
    __builtin_neon_hi buffer[2048];
    int f;

    for (f = 0; f < 128; f += 8)
      __builtin_neon_vst1v8hi (&buffer[f], (__builtin_neon_hi __attribute__ ((__vector_size__ (16)))) {0});
  }

[Ken Werner (kwerner)]

It looks like the issue has been introduced by:
http://bazaar.launchpad.net/~linaro-toolchain-dev/gcc-linaro/4.6/revision/106893
which is a fix for: bug #990530

Linaro GCC 4.7 is not affected.

[Ramana Radhakrishnan (ramana)]

I have been able to reproduce this for Linaro GCC 4.6 and there is something going on in the way in which the backend expands these builtins.

Ramana

[Ramana Radhakrishnan (ramana)]

Bero can you now try tip of tree.

Ramana