Add a new pass "inductive range check elimination"

[oota-llvm.git] / test / Transforms / IRCE / single-access-no-preloop.ll

diff --git a/test/Transforms/IRCE/single-access-no-preloop.ll b/test/Transforms/IRCE/single-access-no-preloop.ll
new file mode 100644 (file)
index 0000000..cf073b3
--- /dev/null
+++ b/test/Transforms/IRCE/single-access-no-preloop.ll
@@ -0,0 +1,110 @@
+; RUN: opt -irce -S < %s | FileCheck %s
+
+define void @single_access_no_preloop_no_offset(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
+  br i1 %first.itr.check, label %loop, label %exit
+
+ loop:
+  %idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
+  %idx.next = add i32 %idx, 1
+  %abc = icmp slt i32 %idx, %len
+  br i1 %abc, label %in.bounds, label %out.of.bounds
+
+ in.bounds:
+  %addr = getelementptr i32* %arr, i32 %idx
+  store i32 0, i32* %addr
+  %next = icmp slt i32 %idx.next, %n
+  br i1 %next, label %loop, label %exit
+
+ out.of.bounds:
+  ret void
+
+ exit:
+  ret void
+}
+
+; CHECK-LABEL: single_access_no_preloop
+
+; CHECK-LABEL: loop:
+; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
+
+; CHECK-LABEL: main.exit.selector:
+; CHECK-NEXT: [[continue:%[^ ]+]] = icmp slt i32 %idx.next, %n
+; CHECK-NEXT: br i1 [[continue]], label %main.pseudo.exit, label %exit.loopexit
+
+; CHECK-LABEL: main.pseudo.exit:
+; CHECK-NEXT: %idx.copy = phi i32 [ 0, %loop.preheader ], [ %idx.next, %main.exit.selector ]
+; CHECK-NEXT: br label %postloop
+
+; CHECK-LABEL: postloop:
+; CHECK-NEXT: br label %loop.postloop
+
+; CHECK-LABEL: loop.postloop:
+; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.next.postloop, %in.bounds.postloop ], [ %idx.copy, %postloop ]
+; CHECK-NEXT: %idx.next.postloop = add i32 %idx.postloop, 1
+; CHECK-NEXT: %abc.postloop = icmp slt i32 %idx.postloop, %len
+; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds
+
+; CHECK-LABEL: in.bounds.postloop:
+; CHECK-NEXT: %addr.postloop = getelementptr i32* %arr, i32 %idx.postloop
+; CHECK-NEXT: store i32 0, i32* %addr.postloop
+; CHECK-NEXT: %next.postloop = icmp slt i32 %idx.next.postloop, %n
+; CHECK-NEXT: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
+
+
+define void @single_access_no_preloop_with_offset(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
+  br i1 %first.itr.check, label %loop, label %exit
+
+ loop:
+  %idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
+  %idx.next = add i32 %idx, 1
+  %idx.for.abc = add i32 %idx, 4
+  %abc = icmp slt i32 %idx.for.abc, %len
+  br i1 %abc, label %in.bounds, label %out.of.bounds
+
+ in.bounds:
+  %addr = getelementptr i32* %arr, i32 %idx.for.abc
+  store i32 0, i32* %addr
+  %next = icmp slt i32 %idx.next, %n
+  br i1 %next, label %loop, label %exit
+
+ out.of.bounds:
+  ret void
+
+ exit:
+  ret void
+}
+
+; CHECK-LABEL: single_access_no_preloop_with_offset
+
+; CHECK-LABEL: loop.preheader:
+; CHECK: [[safe_range_end:[^ ]+]] = sub i32 %len, 4
+; CHECK: [[exit_main_loop_at_cmp:[^ ]+]] = icmp slt i32 %n, [[safe_range_end]]
+; CHECK: [[exit_main_loop_at:[^ ]+]] = select i1 [[exit_main_loop_at_cmp]], i32 %n, i32 [[safe_range_end]]
+; CHECK: [[enter_main_loop:[^ ]+]] = icmp slt i32 0, [[exit_main_loop_at]]
+; CHECK: br i1 [[enter_main_loop]], label %loop, label %main.pseudo.exit
+
+; CHECK-LABEL: loop:
+; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
+
+; CHECK-LABEL: in.bounds:
+; CHECK: [[continue_main_loop:[^ ]+]] = icmp slt i32 %idx.next, [[exit_main_loop_at]]
+; CHECK: br i1 [[continue_main_loop]], label %loop, label %main.exit.selector
+
+; CHECK-LABEL: main.pseudo.exit:
+; CHECK:  %idx.copy = phi i32 [ 0, %loop.preheader ], [ %idx.next, %main.exit.selector ]
+; CHECK:  br label %postloop
+
+; CHECK-LABEL: loop.postloop:
+; CHECK: %idx.postloop = phi i32 [ %idx.next.postloop, %in.bounds.postloop ], [ %idx.copy, %postloop ]
+
+; CHECK-LABEL: in.bounds.postloop:
+; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n
+; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
+
+!0 = !{i32 0, i32 2147483647}