SS 11/1 Optimization Problem

[Graham]

Hi

I did some investigation into this failure and
found the following

It dies in split_block_insns () haifa-sched.c because
it passes a NULL_RTX to NEXT_INSN(). This occurs
when it follows the NEXT_INSN() links and finds a 
NULL_RTX before finding the insn basic_block_end[b]
which should be at the end of the block.

Interestingly it is possible to follow the PREV_INSN()
links from basic_block_end[b] all the way to the 
basic_block_head[b]

Graham