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8e39410125
after fixing few issues I gotto stage where 1.4M icf mismatches are due to
comparing two gimple clobber. The problem is that operand_equal_p match
clobber
case CONSTRUCTOR:
/* In GIMPLE empty constructors are allowed in initializers of
aggregates. */
return !CONSTRUCTOR_NELTS (arg0) && !CONSTRUCTOR_NELTS (arg1);
But this happens too late after comparing its types (that are not very relevant
for memory store).
In the context of ipa-icf we do not really need to match RHS of gimple clobbers:
it is enough to know that the LHS stores can be considered equivalent.
I this added logic to hash them all the same way and compare using
TREE_CLOBBER_P flag. I see other option in extending operand_equal_p
in fold-const to handle them more generously or making stmt hash and compare
to skip comparing/hashing RHS of gimple_clobber_p.
* ipa-icf-gimple.c (func_checker::hash_operand): Hash gimple clobber.
(func_checker::operand_equal_p): Special case gimple clobber.
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