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Diffstat (limited to 'gcc/testsuite/gcc.dg/tree-ssa/loop-8.c')
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/loop-8.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-8.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-8.c new file mode 100644 index 00000000000..9718aad33cf --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-8.c @@ -0,0 +1,25 @@ +/* A test for strength reduction of ivs with nonconstant step. */ + +/* { dg-do compile } */ +/* { dg-options "-O1 -fdump-tree-vars" } */ + +int bar (void); + +int a[100]; + +void xxx (void) +{ + int iter, step = bar (); + + for (iter = 0; iter < 10; iter++) + a[iter * step] = bar (); +} + +/* The array access should be strength reduced. But to determine the value of + the step, we need to calculate step * sizeof (int), thus we need to be + a bit careful about which multiplications we disallow. */ + +/* { dg-final { scan-tree-dump-times "step \\* \[^0-9\]" 0 "vars" } } */ +/* { dg-final { scan-tree-dump-times "\[^0-9\] \\* step" 0 "vars" } } */ + +/* { dg-final { cleanup-tree-dump "vars" } } */ |