https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98026
Andrew Macleod <amacleod at redhat dot com> changed:
What |Removed |Added
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CC| |amacleod at redhat dot com
--- Comment #3 from Andrew Macleod <amacleod at redhat dot com> ---
Although we are now adding relations for these expressions, onc extension we
have not gotten to apply ranges of relations. ie:
<bb 2> :
_1 = j_5(D) > i_6(D);
_2 = i_6(D) > 100;
_3 = _1 | _2;
if (_3 != 0)
goto <bb 3>; [INV]
else
goto <bb 4>; [INV]
2->3 (T) _3 : bool [1, 1]
2->4 (F) _1 : bool [0, 0]
2->4 (F) _2 : bool [0, 0]
2->4 (F) _3 : bool [0, 0]
2->4 (F) i_6(D) : int [-INF, 100]
Relational : (j_5(D) <= i_6(D))
<bb 4> :
if (j_5(D) > 100)
goto <bb 5>; [INV]
else
goto <bb 6>; [INV]
4->5 (T) j_5(D) : int [101, +INF]
4->6 (F) j_5(D) : int [-INF, 100]
We know that j_5 is <= i_6 on the edge 2->4, but we do not apply any known
range of i_6 to j_5.
We do transitive between symbolics, ie (j < x && x < y means j < y)
We do not yet do that with a range as this requires. ie:
j_5 <= i_6, i_6 <= 100 means j <= 100
This will be an enhancement for the next release.
