1 ; Loop Simplify should turn phi nodes like X = phi [X, Y] into just Y, eliminating them. 2 ; RUN: opt < %s -loop-simplify -S | grep phi | count 6 3 4 @A = weak global [3000000 x i32] zeroinitializer ; <[3000000 x i32]*> [#uses=1] 5 @B = weak global [20000 x i32] zeroinitializer ; <[20000 x i32]*> [#uses=1] 6 @C = weak global [100 x i32] zeroinitializer ; <[100 x i32]*> [#uses=1] 7 @Z = weak global i32 0 ; <i32*> [#uses=2] 8 9 define i32 @main() { 10 entry: 11 tail call void @__main( ) 12 br label %loopentry.1 13 loopentry.1: ; preds = %loopexit.1, %entry 14 %indvar20 = phi i32 [ 0, %entry ], [ %indvar.next21, %loopexit.1 ] ; <i32> [#uses=1] 15 %a.1 = phi i32* [ getelementptr ([3000000 x i32]* @A, i32 0, i32 0), %entry ], [ %inc.0, %loopexit.1 ] ; <i32*> [#uses=1] 16 br label %no_exit.2 17 no_exit.2: ; preds = %loopexit.2, %no_exit.2, %loopentry.1 18 %a.0.4.ph = phi i32* [ %a.1, %loopentry.1 ], [ %inc.0, %loopexit.2 ], [ %a.0.4.ph, %no_exit.2 ] ; <i32*> [#uses=3] 19 %b.1.4.ph = phi i32* [ getelementptr ([20000 x i32]* @B, i32 0, i32 0), %loopentry.1 ], [ %inc.1, %loopexit.2 ], [ %b.1.4.ph, %no_exit.2 ] ; <i32*> [#uses=3] 20 %indvar17 = phi i32 [ 0, %loopentry.1 ], [ %indvar.next18, %loopexit.2 ], [ %indvar17, %no_exit.2 ] ; <i32> [#uses=2] 21 %indvar = phi i32 [ %indvar.next, %no_exit.2 ], [ 0, %loopexit.2 ], [ 0, %loopentry.1 ] ; <i32> [#uses=5] 22 %b.1.4.rec = bitcast i32 %indvar to i32 ; <i32> [#uses=1] 23 %gep.upgrd.1 = zext i32 %indvar to i64 ; <i64> [#uses=1] 24 %c.2.4 = getelementptr [100 x i32]* @C, i32 0, i64 %gep.upgrd.1 ; <i32*> [#uses=1] 25 %gep.upgrd.2 = zext i32 %indvar to i64 ; <i64> [#uses=1] 26 %a.0.4 = getelementptr i32* %a.0.4.ph, i64 %gep.upgrd.2 ; <i32*> [#uses=1] 27 %gep.upgrd.3 = zext i32 %indvar to i64 ; <i64> [#uses=1] 28 %b.1.4 = getelementptr i32* %b.1.4.ph, i64 %gep.upgrd.3 ; <i32*> [#uses=1] 29 %inc.0.rec = add i32 %b.1.4.rec, 1 ; <i32> [#uses=2] 30 %inc.0 = getelementptr i32* %a.0.4.ph, i32 %inc.0.rec ; <i32*> [#uses=2] 31 %tmp.13 = load i32* %a.0.4 ; <i32> [#uses=1] 32 %inc.1 = getelementptr i32* %b.1.4.ph, i32 %inc.0.rec ; <i32*> [#uses=1] 33 %tmp.15 = load i32* %b.1.4 ; <i32> [#uses=1] 34 %tmp.18 = load i32* %c.2.4 ; <i32> [#uses=1] 35 %tmp.16 = mul i32 %tmp.15, %tmp.13 ; <i32> [#uses=1] 36 %tmp.19 = mul i32 %tmp.16, %tmp.18 ; <i32> [#uses=1] 37 %tmp.20 = load i32* @Z ; <i32> [#uses=1] 38 %tmp.21 = add i32 %tmp.19, %tmp.20 ; <i32> [#uses=1] 39 store i32 %tmp.21, i32* @Z 40 %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2] 41 %exitcond = icmp eq i32 %indvar.next, 100 ; <i1> [#uses=1] 42 br i1 %exitcond, label %loopexit.2, label %no_exit.2 43 loopexit.2: ; preds = %no_exit.2 44 %indvar.next18 = add i32 %indvar17, 1 ; <i32> [#uses=2] 45 %exitcond19 = icmp eq i32 %indvar.next18, 200 ; <i1> [#uses=1] 46 br i1 %exitcond19, label %loopexit.1, label %no_exit.2 47 loopexit.1: ; preds = %loopexit.2 48 %indvar.next21 = add i32 %indvar20, 1 ; <i32> [#uses=2] 49 %exitcond22 = icmp eq i32 %indvar.next21, 300 ; <i1> [#uses=1] 50 br i1 %exitcond22, label %return, label %loopentry.1 51 return: ; preds = %loopexit.1 52 ret i32 undef 53 } 54 55 declare void @__main() 56
