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Re: Tree sharing issues...

>  >OK, I will extend my sharing test by is_gimple_min_invariant.  Does that
>  >look right?
> is_gimple_min_invariant (blah) && ! IS_EMPTY_STMT (blah) since I
> believe the empty statement is (void) 0, but is not shared.
> 
> Ugh.
OK, another positive:
../../gcc/caller-save.c:370: error: Wrong sharing of tree nodes
#   hard_regs_to_save_6 = VDEF <hard_regs_to_save_624>;
hard_regs_to_save[1] = T.329_1370;

hard_regs_to_save[1];

../../gcc/caller-save.c:370: error: Wrong sharing of tree nodes
#   hard_regs_to_save_143 = VDEF <hard_regs_to_save_81>;
hard_regs_to_save[1] = T.339_1393;

hard_regs_to_save[1];

../../gcc/caller-save.c:370: error: Wrong sharing of tree nodes
#   hard_regs_to_save_623 = VDEF <hard_regs_to_save_488>;
hard_regs_to_save[1] = T.349_1416;

hard_regs_to_save[1];

../../gcc/caller-save.c:370: error: Wrong sharing of tree nodes
#   hard_regs_to_save_80 = VDEF <hard_regs_to_save_5>;
hard_regs_to_save[1] = T.357_1437;

hard_regs_to_save[1];


This looks wrong.  Seems to happen during jump threading...
Ideas?

Honza
> 
> jeff
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