On Okt 10 2017, Richard Biener wrote:
> * tree-cfgcleanup.c (cleanup_tree_cfg_noloop): Avoid compacting
> blocks if SCEV is active.
> * tree-scalar-evolution.c (analyze_scalar_evolution_1): Remove
> dead code.
> (analyze_scalar_evolution): Handle cached evolutions th
This simplifies SCEV analyze_scalar_evolution_1 by removing what appeared
to be dead code for the case of res != chrec_not_analyzed_yet. Adding
a gcc_unrechable () turned up a rather serious bug though as in the
loop pipeline we get a messed up SCEV cache if CFG cleanup renumbers
blocks given SC
