ICE: in vect_is_simple_use_1, at tree-vect-stmts.c (-ftree-vectorize -mfpu=neon)

[Juha Kallioinen]

I was building speex 1.2rc1 (http://www.speex.org/) with linaro gcc 4.6 2012.02/03 and got this ICE.

kalahost [14:32] (~/tmp/spee): gcc-linaro-arm-linux-gnueabi-2012.02-20120222_linux/bin/arm-linux-gnueabi-gcc -O1 -ftree-vectorize -mfpu=neon minimal-test.i -c
minimal-test.i: In function ‘lsp_quant_nb’:
minimal-test.i:14:6: internal compiler error: in vect_is_simple_use_1, at tree-vect-stmts.c:5867
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.launchpad.net/gcc-linaro> for instructions.

I've tested it with FSF gcc 4.6.3 and it does not crash.

The minimal options needed to reproduce this are -O1 -ftree-vectorize -mfpu=neon.

Attached is a reduced test case.

[Zhenqiang Chen (zhenqiang-chen)]

Thank you for the bug report. I can reproduce this in linaro gcc 4.6 2012.02/03 release. And it reports the same error with -O2/O3 -ftree-vectorize -mfpu=neon

It works without -mfpu=neon.

[Zhenqiang Chen (zhenqiang-chen)]

It also happens in the upstream 4.7 release candidate. Please log it in GCC bugzilla.

arm-linux-gnueabi-gcc -O1 -ftree-vectorize -mfpu=neon minimal-test.i -c
minimal-test.i: In function 'lsp_quant_nb':
minimal-test.i:14:6: internal compiler error: in vect_is_simple_use_1, at tree-vect-stmts.c:6057
Please submit a full bug report,
with preprocessed source if appropriate.

[Juha Kallioinen (juha-kallioinen)]

Reported upstream http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52633.