1 ; RUN: opt < %s -O1 -S -loop-versioning-licm -licm -debug-only=loop-versioning-licm 2>&1 | FileCheck %s 2 ; REQUIRES: asserts 3 ; 4 ; Test to confirm loop is a candidate for LoopVersioningLICM. 5 ; It also confirms invariant moved out of loop. 6 ; 7 ; CHECK: Loop: Loop at depth 2 containing: %for.body3<header><latch><exiting> 8 ; CHECK-NEXT: Loop Versioning found to be beneficial 9 ; 10 ; CHECK: for.body3: 11 ; CHECK-NEXT: %add86 = phi i32 [ %arrayidx7.promoted, %for.body3.ph ], [ %add8, %for.body3 ] 12 ; CHECK-NEXT: %j.113 = phi i32 [ %j.016, %for.body3.ph ], [ %inc, %for.body3 ] 13 ; CHECK-NEXT: %idxprom = zext i32 %j.113 to i64 14 ; CHECK-NEXT: %arrayidx = getelementptr inbounds i32, i32* %var1, i64 %idxprom 15 ; CHECK-NEXT: store i32 %add, i32* %arrayidx, align 4, !alias.scope !6, !noalias !6 16 ; CHECK-NEXT: %add8 = add nsw i32 %add86, %add 17 ; CHECK-NEXT: %inc = add nuw i32 %j.113, 1 18 ; CHECK-NEXT: %cmp2 = icmp ult i32 %inc, %itr 19 ; CHECK-NEXT: br i1 %cmp2, label %for.body3, label %for.inc11.loopexit.loopexit5, !llvm.loop !7 20 define i32 @foo(i32* nocapture %var1, i32* nocapture readnone %var2, i32* nocapture %var3, i32 %itr) #0 { 21 entry: 22 %cmp14 = icmp eq i32 %itr, 0 23 br i1 %cmp14, label %for.end13, label %for.cond1.preheader.preheader 24 25 for.cond1.preheader.preheader: ; preds = %entry 26 br label %for.cond1.preheader 27 28 for.cond1.preheader: ; preds = %for.cond1.preheader.preheader, %for.inc11 29 %j.016 = phi i32 [ %j.1.lcssa, %for.inc11 ], [ 0, %for.cond1.preheader.preheader ] 30 %i.015 = phi i32 [ %inc12, %for.inc11 ], [ 0, %for.cond1.preheader.preheader ] 31 %cmp212 = icmp ult i32 %j.016, %itr 32 br i1 %cmp212, label %for.body3.lr.ph, label %for.inc11 33 34 for.body3.lr.ph: ; preds = %for.cond1.preheader 35 %add = add i32 %i.015, %itr 36 %idxprom6 = zext i32 %i.015 to i64 37 %arrayidx7 = getelementptr inbounds i32, i32* %var3, i64 %idxprom6 38 br label %for.body3 39 40 for.body3: ; preds = %for.body3.lr.ph, %for.body3 41 %j.113 = phi i32 [ %j.016, %for.body3.lr.ph ], [ %inc, %for.body3 ] 42 %idxprom = zext i32 %j.113 to i64 43 %arrayidx = getelementptr inbounds i32, i32* %var1, i64 %idxprom 44 store i32 %add, i32* %arrayidx, align 4 45 %0 = load i32, i32* %arrayidx7, align 4 46 %add8 = add nsw i32 %0, %add 47 store i32 %add8, i32* %arrayidx7, align 4 48 %inc = add nuw i32 %j.113, 1 49 %cmp2 = icmp ult i32 %inc, %itr 50 br i1 %cmp2, label %for.body3, label %for.inc11.loopexit 51 52 for.inc11.loopexit: ; preds = %for.body3 53 br label %for.inc11 54 55 for.inc11: ; preds = %for.inc11.loopexit, %for.cond1.preheader 56 %j.1.lcssa = phi i32 [ %j.016, %for.cond1.preheader ], [ %itr, %for.inc11.loopexit ] 57 %inc12 = add nuw i32 %i.015, 1 58 %cmp = icmp ult i32 %inc12, %itr 59 br i1 %cmp, label %for.cond1.preheader, label %for.end13.loopexit 60 61 for.end13.loopexit: ; preds = %for.inc11 62 br label %for.end13 63 64 for.end13: ; preds = %for.end13.loopexit, %entry 65 ret i32 0 66 } 67 68
