1; RUN: llc -march=hexagon -hexagon-hwloop-preheader < %s | FileCheck %s 2 3; Generate hardware loops when we also need to add a new preheader. 4; we should generate two hardware loops for this test case. 5 6; CHECK: loop0 7; CHECK: endloop0 8; CHECK: loop0 9; CHECK: endloop0 10 11@g = external global i32 12 13define void @test(i32* nocapture %a, i32* nocapture %b, i32 %n) nounwind { 14entry: 15 %tobool = icmp eq i32 %n, 0 16 br i1 %tobool, label %for.body4.preheader, label %for.body.preheader 17 18for.body.preheader: 19 br label %for.body 20 21for.body: 22 %arrayidx.phi = phi i32* [ %arrayidx.inc, %for.body ], [ %a, %for.body.preheader ] 23 %i.014 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ] 24 %0 = load i32, i32* @g, align 4 25 store i32 %0, i32* %arrayidx.phi, align 4 26 %inc = add nsw i32 %i.014, 1 27 %exitcond15 = icmp eq i32 %inc, 3 28 %arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1 29 br i1 %exitcond15, label %for.body4.preheader.loopexit, label %for.body 30 31for.body4.preheader.loopexit: 32 br label %for.body4.preheader 33 34for.body4.preheader: 35 br label %for.body4 36 37for.body4: 38 %arrayidx5.phi = phi i32* [ %arrayidx5.inc, %for.body4 ], [ %b, %for.body4.preheader ] 39 %i1.013 = phi i32 [ %inc7, %for.body4 ], [ 0, %for.body4.preheader ] 40 %1 = load i32, i32* @g, align 4 41 store i32 %1, i32* %arrayidx5.phi, align 4 42 %inc7 = add nsw i32 %i1.013, 1 43 %exitcond = icmp eq i32 %inc7, 3 44 %arrayidx5.inc = getelementptr i32, i32* %arrayidx5.phi, i32 1 45 br i1 %exitcond, label %for.end8, label %for.body4 46 47for.end8: 48 ret void 49} 50