48 lines · plain
1; RUN: opt -passes=loop-simplify -S < %s | FileCheck %s2 3; This will test whether or not the metadata from the current loop 1 latch4; is removed, and applied to the new latch after running the loop-simplify5; pass on this function. The loop simplify pass ensures that each loop has exit6; blocks which only have predecessors that are inside of the loop. This7; guarantees that the loop preheader/header will dominate the exit blocks. For8; this function currently loop 2 does not have a dedicated exit block.9 10; CHECK: loop_1_loopHeader.loopexit:11; CHECK: br label %loop_1_loopHeader, !llvm.loop [[LOOP_1_LATCH_MD:![0-9]+]]12; CHECK: loop_2_loopHeader13; CHECK: br i1 %grt_B, label %loop_1_loopHeader.loopexit, label %loop_2_do14; CHECK-NOT: br i1 %grt_B, label %loop_1_loopHeader, label %loop_2_do, !llvm.loop{{.*}}15 16define void @function(i32 %A) {17entry:18 %B = add i32 %A, 4519 %C = add i32 %A, 2220 br label %loop_1_loopHeader21 22loop_1_loopHeader: ; preds = %loop_2_loopHeader, %entry23 %loop_1_idx = phi i32 [ 1, %entry], [ %loop_1_update_idx, %loop_2_loopHeader ]24 %grt_C = icmp slt i32 %loop_1_idx, %C25 br i1 %grt_C, label %exit, label %loop_1_do26 27loop_1_do: ; preds = %loop_1_loopHeader28 %loop_1_update_idx = add nuw nsw i32 %loop_1_idx, 129 br label %loop_2_loopHeader30 31loop_2_loopHeader: ; preds = %loop_2_do, %_loop_1_do32 %loop_2_idx = phi i32 [ 1, %loop_1_do ], [ %loop_2_update_idx, %loop_2_do ]33 %grt_B = icmp slt i32 %loop_2_idx, %B34 br i1 %grt_B, label %loop_1_loopHeader, label %loop_2_do, !llvm.loop !035 36loop_2_do: ; preds = %loop_2_loopHeader37 %loop_2_update_idx = add nuw nsw i32 %loop_2_idx, 138 br label %loop_2_loopHeader, !llvm.loop !239 40exit: ; preds = %loop_1_loopHeader41 ret void42}43 44!0 = distinct !{!0, !1}45!1 = !{!"llvm.loop.unroll.disable"}46!2 = distinct !{!2, !1}47 48