diff options
Diffstat (limited to 'test/Transforms/IRCE/decrementing-loop.ll')
| -rw-r--r-- | test/Transforms/IRCE/decrementing-loop.ll | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/test/Transforms/IRCE/decrementing-loop.ll b/test/Transforms/IRCE/decrementing-loop.ll new file mode 100644 index 0000000..877a2c2 --- /dev/null +++ b/test/Transforms/IRCE/decrementing-loop.ll @@ -0,0 +1,43 @@ +; RUN: opt -irce -S < %s | FileCheck %s + +define void @decrementing_loop(i32 *%arr, i32 *%a_len_ptr, i32 %n) { + entry: + %len = load i32* %a_len_ptr, !range !0 + %first.itr.check = icmp sgt i32 %n, 0 + %start = sub i32 %n, 1 + br i1 %first.itr.check, label %loop, label %exit + + loop: + %idx = phi i32 [ %start, %entry ] , [ %idx.dec, %in.bounds ] + %idx.dec = sub i32 %idx, 1 + %abc.high = icmp slt i32 %idx, %len + %abc.low = icmp sge i32 %idx, 0 + %abc = and i1 %abc.low, %abc.high + br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1 + + in.bounds: + %addr = getelementptr i32* %arr, i32 %idx + store i32 0, i32* %addr + %next = icmp sgt i32 %idx.dec, -1 + br i1 %next, label %loop, label %exit + + out.of.bounds: + ret void + + exit: + ret void + +; CHECK: loop.preheader: +; CHECK: [[indvar_start:[^ ]+]] = add i32 %n, -1 +; CHECK: [[not_len:[^ ]+]] = sub i32 -1, %len +; CHECK: [[not_n:[^ ]+]] = sub i32 -1, %n +; CHECK: [[not_len_hiclamp_cmp:[^ ]+]] = icmp sgt i32 [[not_len]], [[not_n]] +; CHECK: [[not_len_hiclamp:[^ ]+]] = select i1 [[not_len_hiclamp_cmp]], i32 [[not_len]], i32 [[not_n]] +; CHECK: [[len_hiclamp:[^ ]+]] = sub i32 -1, [[not_len_hiclamp]] +; CHECK: [[not_exit_preloop_at_cmp:[^ ]+]] = icmp sgt i32 [[len_hiclamp]], 0 +; CHECK: [[not_exit_preloop_at:[^ ]+]] = select i1 [[not_exit_preloop_at_cmp]], i32 [[len_hiclamp]], i32 0 +; CHECK: %exit.preloop.at = add i32 [[not_exit_preloop_at]], -1 +} + +!0 = !{i32 0, i32 2147483647} +!1 = !{!"branch_weights", i32 64, i32 4} |