Moritz Roth f5d0c7c2c0 [Thumb] Make load/store optimizer less conservative. ...

If it's safe to clobber the condition flags, we can do a few extra things:
it's then possible to reset the base register writeback using a SUBS, so
we can try to merge even if the base register isn't dead after the merged
instruction.

This is effectively a (heavily bug-fixed) rewrite of r208992.

llvm-svn: 218386

2014-09-24 16:35:50 +00:00

2.6 KiB

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