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1; REQUIRES: asserts2; RUN: opt < %s -passes="loop(loop-interchange,loop-interchange)" -cache-line-size=8 -verify-dom-info -verify-loop-info \3; RUN: -debug-only=loop-interchange 2>&1 | FileCheck %s4 5target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"6 7@g_75 = external global i32, align 18@g_78 = external global [6 x ptr], align 19 10; Loop interchange as a loopnest pass should always construct the loop nest from11; the outermost loop. This test case runs loop interchange twice. In the loop pass12; manager, it might occur that after the first loop interchange transformation13; the original outermost loop becomes a inner loop hence the loop nest constructed14; afterwards for the second loop interchange pass turns out to be a loop list of size15; 2 and is not valid. This causes functional issues.16;17; Make sure we always construct the valid and correct loop nest at the beginning18; of execution of a loopnest pass.19 20; CHECK: Processing LoopList of size = 321; CHECK: Processing LoopList of size = 322define void @loopnest_01() {23entry:24 br label %for.cond5.preheader.i.i.i25 26for.cond5.preheader.i.i.i: ; preds = %for.end16.i.i.i, %entry27 %storemerge11.i.i.i = phi i32 [ 4, %entry ], [ %sub18.i.i.i, %for.end16.i.i.i ]28 br label %for.cond8.preheader.i.i.i29 30for.cond8.preheader.i.i.i: ; preds = %for.inc14.i.i.i, %for.cond5.preheader.i.i.i31 %l_105.18.i.i.i = phi i16 [ 0, %for.cond5.preheader.i.i.i ], [ %add15.i.i.i, %for.inc14.i.i.i ]32 br label %for.body10.i.i.i33 34for.body10.i.i.i: ; preds = %for.body10.i.i.i, %for.cond8.preheader.i.i.i35 %storemerge56.i.i.i = phi i16 [ 5, %for.cond8.preheader.i.i.i ], [ %sub.i.i.i, %for.body10.i.i.i ]36 %arrayidx.i.i.i = getelementptr [6 x ptr], ptr @g_78, i16 0, i16 %storemerge56.i.i.i37 store ptr @g_75, ptr %arrayidx.i.i.i, align 138 %sub.i.i.i = add nsw i16 %storemerge56.i.i.i, -139 %cmp = icmp sgt i16 %sub.i.i.i, 040 br i1 %cmp, label %for.body10.i.i.i, label %for.inc14.i.i.i41 42for.inc14.i.i.i: ; preds = %for.body10.i.i.i43 %add15.i.i.i = add nuw nsw i16 %l_105.18.i.i.i, 144 %exitcond.not.i.i.i = icmp eq i16 %add15.i.i.i, 645 br i1 %exitcond.not.i.i.i, label %for.end16.i.i.i, label %for.cond8.preheader.i.i.i46 47for.end16.i.i.i: ; preds = %for.inc14.i.i.i48 %sub18.i.i.i = add nsw i32 %storemerge11.i.i.i, -149 %cmp.i10.not.i.i = icmp eq i32 %storemerge11.i.i.i, 050 br i1 %cmp.i10.not.i.i, label %func_4.exit.i, label %for.cond5.preheader.i.i.i51 52func_4.exit.i: ; preds = %for.end16.i.i.i53 unreachable54}55