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Date: Wed, 21 Nov 2012 10:08:00 -0000
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Subject: ARM/NEON: vld1q_dup_s64 builtin
From: Manjunath Matti <mmatti.gcc@gmail.com>
To: gcc-bugs@gcc.gnu.org
Cc: ramana.radhakrishnan@linaro.org, Christophe Lyon <christophe.lyon@st.com>
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Hi,

I have encountered a following ICE on arm big endian target

{{{
neon-vld1_dupQ.c: In function =91main=92:
neon-vld1_dupQ.c:24:1: error: unrecognizable insn:
(insn 94 93 31 (set (subreg:DI (reg:V2DI 95 d16 [orig:137 D.14400 ] [137]) =
0)
        (subreg:DI (reg:V2DI 95 d16 [orig:137 D.14400 ] [137]) 8))
/home/armbe/toolchain/armeb-tools/bin/../lib/gcc/armeb-montavista-linux-gnu=
eabi/4.7.0/include/arm_neon.h:8214
-1
     (nil))
neon-vld1_dupQ.c:24:1: internal compiler error: in extract_insn, at recog.c=
:2123
Please submit a full bug report,
}}}

My initial investigation shows that the following patch (split insn)
http://gcc.gnu.org/ml/gcc-patches/2012-05/msg01131.html is causing
this failure.
I think the CANNOT_CHANGE_MODE_CLASS macro is present and also plays a
role in not allowing the mov of DImode in this case.

If I revert the patch then I do not encounter this problem. Could you help
me with the pointers to solve this problem.

Regards,
Manjunath S Matti.