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0135a90de5
As shown in PR115936 SCEV and IVOPTS create an invalidate IV when the IV is
a pointer type:
ivtmp.39_65 = ivtmp.39_59 + 0B;
where the IVs are DI mode and the offset is a pointer.
This comes from this weird candidate:
Candidate 8:
Var befor: ivtmp.39_59
Var after: ivtmp.39_65
Incr POS: before exit test
IV struct:
Type: sizetype
Base: 0
Step: 0B
Biv: N
Overflowness wrto loop niter: No-overflow
This IV was always created just ended up not being used.
This is created by SCEV.
simple_iv_with_niters in the case where no CHREC is found creates an IV with
base == ev, offset == 0;
however in this case EV is a POINTER_PLUS_EXPR and so the type is a pointer.
it ends up creating an unusable expression.
gcc/ChangeLog:
PR tree-optimization/115936
* tree-scalar-evolution.cc (simple_iv_with_niters): Use sizetype for
pointers.
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