ICE: variable_post_merge_new_vals, at var-tracking.c:4430

["Jon Beniston" <jon at beniston dot com>]

Hi,

I'm trying to get the LM32 port of GCC 4.8.0 working. Currently the compiler
is generating an ICE for a number of newlib files in the same location, when
-g and -O1 or -O2 are specified:

internal compiler error: in variable_post_merge_new_vals, at
var-tracking.c:4430

Which is the following code:

		      gcc_assert (!cselib_lookup (node->loc,
						  GET_MODE (node->loc), 0,
						  VOIDmode));

I'm also seeing this problem on a port to another CPU that isn't in the FSF
tree.

Any suggestions as to what in the backend might be causing this? i.e. any
changes that need to be made from 4.7 (where this problem didn't occur) to
4.8? I've looked through a few other of the simpler ports and I can't really
see any changes that have been made that might be related. I don't know much
about the var-tracking code though, so not sure where to start looking. I've
attached a dump from the last two passes of the compiler.

Thanks,
Jon

Attachment: test.tar.gz
Description: Binary data