55db240d28
The following testcase ICEs because eliminate_redundant_comparison sees
redundant comparisons in &&/|| where the comparison has (ab) SSA_NAME,
maybe_fold_{and,or}_comparisons optimizes them into a single comparison
and build_and_add_sum emits a new comparison close to the definition
operands, which in this case is before a returns_twice call (which is
invalid). Generally reassoc just punts on (ab) SSA_NAMEs, declares them
non-reassociable etc., so the second half of this patch does that.
Though we can do better in this case; the function has special code
when maybe_fold_{and,or}_comparisons returns INTEGER_CST (false/true)
or when what it returns is the same as curr->op (the first of the
comparisons we are considering) - in that case we just remove the
second one and keep the first one. The reason it doesn't match is that
curr->op is a SSA_NAME whose SSA_NAME_DEF_STMT is checked to be a
comparison, in this case _42 = a_1(ab) != 0 and the other comparison
is also like that. maybe_fold_{and,or}_comparisons looks through the
definitions though and so returns a_1(ab) != 0 as tree.
So the first part of the patch checks whether that returned comparison
isn't the same as the curr->op comparison and if yes, it just overrides
t back to curr->op so that its SSA_NAME is reused. In that case we can
handle even (ab) in {,new}op{1,2} because we don't create a new comparison
of that, just keep using the existing one. And t can't be (ab) because
otherwise it wouldn't be considered a reassociable operand.
The (ab) checks are needed say when we have a_1(ab) == 42 || a_1(ab) > 42
kind of comparisons where maybe_fold_{and,or}_comparisons returns a new
comparison not existing in the IL yet.
2023-02-16 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/108783
* tree-ssa-reassoc.cc (eliminate_redundant_comparison): If lcode
is equal to TREE_CODE (t), op1 to newop1 and op2 to newop2, set
t to curr->op. Otherwise, punt if either newop1 or newop2 are
SSA_NAME_OCCURS_IN_ABNORMAL_PHI SSA_NAMEs.
* gcc.c-torture/compile/pr108783.c: New test.
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