1 ; REQUIRES: asserts 2 ; RUN: opt < %s -basicaa -loop-interchange -pass-remarks-missed='loop-interchange' -pass-remarks-output=%t -S \ 3 ; RUN: -verify-dom-info -verify-loop-info -stats 2>&1 | FileCheck -check-prefix=STATS %s 4 ; RUN: FileCheck --input-file=%t %s 5 6 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 7 target triple = "x86_64-unknown-linux-gnu" 8 9 @A = common global [100 x [100 x i32]] zeroinitializer 10 11 declare void @foo(i64 %a) 12 declare void @bar(i64 %a) readnone 13 14 ;;--------------------------------------Test case 01------------------------------------ 15 ;; Not safe to interchange, because the called function `foo` is not marked as 16 ;; readnone, so it could introduce dependences. 17 ;; 18 ;; for(int i=0;i<100;i++) { 19 ;; for(int j=1;j<100;j++) { 20 ;; foo(i); 21 ;; A[j][i] = A[j][i]+k; 22 ;; } 23 ;; } 24 25 ; CHECK: --- !Missed 26 ; CHECK-NEXT: Pass: loop-interchange 27 ; CHECK-NEXT: Name: CallInst 28 ; CHECK-NEXT: Function: interchange_01 29 ; CHECK-NEXT: Args: 30 ; CHECK-NEXT - String: Cannot interchange loops due to call instruction. 31 32 define void @interchange_01(i32 %k) { 33 entry: 34 br label %for1.header 35 36 for1.header: 37 %indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for1.inc10 ] 38 br label %for2 39 40 for2: 41 %indvars.iv = phi i64 [ %indvars.iv.next, %for2 ], [ 1, %for1.header ] 42 call void @foo(i64 %indvars.iv23) 43 %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23 44 %lv = load i32, i32* %arrayidx5 45 %add = add nsw i32 %lv, %k 46 store i32 %add, i32* %arrayidx5 47 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 48 %exitcond = icmp eq i64 %indvars.iv, 99 49 br i1 %exitcond, label %for2.loopexit , label %for2 50 51 for2.loopexit: 52 br label %for1.inc10 53 54 for1.inc10: 55 %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1 56 %exitcond26 = icmp eq i64 %indvars.iv23, 99 57 br i1 %exitcond26, label %for1.loopexit, label %for1.header 58 59 for1.loopexit: 60 br label %exit 61 62 exit: 63 ret void 64 } 65 66 ;;--------------------------------------Test case 02------------------------------------ 67 ;; Safe to interchange, because the called function `bar` is marked as readnone, 68 ;; so it cannot introduce dependences. 69 ;; 70 ;; for(int i=0;i<100;i++) { 71 ;; for(int j=1;j<100;j++) { 72 ;; bar(i); 73 ;; A[j][i] = A[j][i]+k; 74 ;; } 75 ;; } 76 77 ; CHECK: --- !Passed 78 ; CHECK-NEXT: Pass: loop-interchange 79 ; CHECK-NEXT: Name: Interchanged 80 ; CHECK-NEXT: Function: interchange_02 81 ; CHECK-NEXT: Args: 82 ; CHECK-NEXT: - String: Loop interchanged with enclosing loop. 83 ; CHECK-NEXT: ... 84 85 define void @interchange_02(i32 %k) { 86 entry: 87 br label %for1.header 88 89 for1.header: 90 %indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for1.inc10 ] 91 br label %for2 92 93 for2: 94 %indvars.iv = phi i64 [ %indvars.iv.next, %for2 ], [ 1, %for1.header ] 95 call void @bar(i64 %indvars.iv23) 96 %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23 97 %lv = load i32, i32* %arrayidx5 98 %add = add nsw i32 %lv, %k 99 store i32 %add, i32* %arrayidx5 100 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 101 %exitcond = icmp eq i64 %indvars.iv, 99 102 br i1 %exitcond, label %for2.loopexit , label %for2 103 104 for2.loopexit: 105 br label %for1.inc10 106 107 for1.inc10: 108 %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1 109 %exitcond26 = icmp eq i64 %indvars.iv23, 99 110 br i1 %exitcond26, label %for1.loopexit, label %for1.header 111 112 for1.loopexit: 113 br label %exit 114 115 exit: 116 ret void 117 } 118 119 ; Check stats, we interchanged 1 out of 2 loops. 120 ; STATS: 1 loop-interchange - Number of loops interchanged 121
