| /* APPLE LOCAL file lno */ |
| /* { dg-do compile } */ |
| /* { dg-options "-O1 -floop-test -fdump-tree-lptest-details" } */ |
| |
| int main(void) |
| { |
| int a = -100; |
| int b = 2; |
| int c = 3; |
| int d = 4; |
| int e = 5; |
| |
| while (a) |
| { |
| /* Exercises the cycle detector: a -> b -> (c -> d -> e -> c)*. */ |
| a += b; |
| b += c; |
| c += d; |
| d += e; |
| e += c; |
| } |
| } |
| |
| /* This is what is commonly called a "mixer". It whirls the data in a |
| strongly connected component. We expect the following evolution |
| functions: |
| |
| e -> {5, +, c_13}_1 |
| d -> {4, +, {5, +, c_13}_1}_1 |
| c -> {3, +, {4, +, {5, +, c_13}_1}_1}_1 |
| b -> {2, +, {3, +, {4, +, {5, +, c_13}_1}_1}_1}_1 |
| a -> {-100, +, {2, +, {3, +, {4, +, {5, +, c_13}_1}_1}_1}_1}_1 |
| */ |
| |
| /* FIXME: |
| For the moment this testcase does not test for anything, but for |
| not ICEing, and for documentation purposes (okay here is the |
| definition of a mixer). However, I'm considering testing something |
| around the lines of ssa-chrec-08.c, ie. build two mixers, and then |
| compare their values. But that is difficult, and low priority. */ |
| |
| |
