diff options
Diffstat (limited to 'gcc/testsuite/gcc.dg/tree-ssa/loop-2.c')
-rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/loop-2.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-2.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-2.c new file mode 100644 index 00000000000..41f42215b85 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-2.c @@ -0,0 +1,37 @@ +/* A test for strength reduction and induction variable elimination. */ + +/* { dg-do compile } */ +/* { dg-options "-O1 -fdump-tree-vars" } */ + +/* Size of this structure should be sufficiently weird so that no memory + addressing mode applies. */ + +struct bla +{ + char x[187]; + int y; + char z[253]; +} arr_base[100]; + +void xxx(void) +{ + int iter; + + for (iter = 0; iter < 100; iter++) + arr_base[iter].y = 17 * iter; +} + +/* Access to arr_base[iter].y should be strength reduced. */ + +/* { dg-final { scan-tree-dump-times "arr_base.*=" 0 "vars" } } */ + +/* 17 * iter should be strength reduced. */ + +/* { dg-final { scan-tree-dump-times " \\* 17" 0 "vars" } } */ +/* { dg-final { scan-tree-dump-times " \\+ 17" 1 "vars" } } */ + +/* The induction variable comparison with 99 should be eliminated + and replaced by comparison of the variable for 17 * iter with 1700. */ + +/* { dg-final { scan-tree-dump-times "1700" 1 "vars" } } */ +/* { dg-final { scan-tree-dump-times "iter" 0 "vars" } } */ |