[Bug rtl-optimization/53278] [4.8 regression] internal compiler error: in df_uses_record, at df-scan.c:3179 when compiling libgcc2.c __mulvdi3 on armv5tel-linux

[ramana at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53278

--- Comment #3 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> 2012-05-08 
14:56:18 UTC ---
The patch below appears to trigger the issue but there's a fundamental question
as to why lower-subreg generates concatns when the documentation suggests that
concat and concatn should only be used in declarations but not in the insn
stream. 


http://gcc.gnu.org/ml/gcc-patches/2012-05/msg00423.html