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# 1fa7b972 16-Feb-2015 Tobias Grosser <tobias@grosser.es>

Update to isl 99d53692ba

This commit imports the latest isl version into lib/External/isl. The changes
relavant for Polly are:

1) Schedule trees [1] have been introduced as a more structured way

Update to isl 99d53692ba

This commit imports the latest isl version into lib/External/isl. The changes
relavant for Polly are:

1) Schedule trees [1] have been introduced as a more structured way to
describe schedules. Polly does not yet use them, but we may switch to them
in the near future.
2) Another set of coalescing changes [2] simplifies some data dependences and
removes a couple of code generation artifacts.

We now understand that the following sets can be merged:

{ Stmt_S1[i0, i1] -> Stmt_S2[i0 + i1] :
i0 >= 0 and i1 <= 1023 - i0 and i1 >= 1
Stmt_S1[i0, 0] -> Stmt_S2[i0] : i0 <= 1023 and i0 >= 1}

into:

{ Stmt_S1[i0, i1] -> Stmt_S2[i0 + i1] : i1 <= 1023 - i0 and i1 >= 0 and
i1 >= 1 - i0 and i0 >= 0 }

Changes of this kind reduce unnecessary specialization during code
generation.

- for (int c3 = 0; c3 <= 1023; c3 += 1) {
- if (c3 % 2 == 0) {
- Stmt_for_body3(c1, c3);
- } else
- Stmt_for_body3(c1, c3);
- }
+ for (int c3 = 0; c3 <= 1023; c3 += 1)
+ Stmt_for_body3(c1, c3);

[1] http://impact.gforge.inria.fr/impact2014/papers/impact2014-verdoolaege.pdf
[2] http://impact.gforge.inria.fr/impact2015/papers/impact2015-verdoolaege.pdf

llvm-svn: 229423

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