Loop-IM: Hoist (non-expensive) stmts to executed all loop when running before PRE

While fixing up how rewrite_to_defined_overflow works, gcc.dg/Wrestrict-22.c started
to fail. This is because `d p+ 2` would moved by LIM and then be rewritten not using
pointer plus. The rewriting part is correct behavior. It only recently started to be
moved out; due to r16-190-g6901d56fea2132.
Which has the following comment:
```
When we run before PRE and PRE is active hoist all expressions
since PRE would do so anyway and we can preserve range info
but PRE cannot.
```
This is not true if hoisting past the always executed point; so, instead of hoisting
these statements all the way out of the max loops, take into account the always executed
loop too.

Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

	* tree-ssa-loop-im.cc (compute_invariantness): Hoist to the always executed point
	if ignorning the cost.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

0 files changed, 0 insertions, 0 deletions