| Andreas Bolka | 0dcde10 | 2009-07-23 15:56:53 +0000 | [diff] [blame] | 1 | ; RUN: llvm-as < %s | opt -disable-output -analyze -lda | FileCheck %s |
| 2 | |
| 3 | @x = common global [256 x i32] zeroinitializer, align 4 |
| 4 | @y = common global [256 x i32] zeroinitializer, align 4 |
| 5 | |
| 6 | ; for (i = 0; i < 256; i++) |
| 7 | ; x[i] = x[256 - i] + y[i] |
| 8 | |
| 9 | define void @f1(...) nounwind { |
| 10 | entry: |
| 11 | br label %for.body |
| 12 | |
| 13 | for.body: |
| 14 | %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ] |
| 15 | %i.256 = sub i64 256, %i |
| 16 | %y.ld.addr = getelementptr [256 x i32]* @y, i64 0, i64 %i.256 |
| 17 | %x.ld.addr = getelementptr [256 x i32]* @x, i64 0, i64 %i |
| 18 | %x.st.addr = getelementptr [256 x i32]* @x, i64 0, i64 %i |
| 19 | %x = load i32* %x.ld.addr ; 0 |
| 20 | %y = load i32* %y.ld.addr ; 1 |
| 21 | %r = add i32 %y, %x |
| 22 | store i32 %r, i32* %x.st.addr ; 2 |
| 23 | ; CHECK: 0,2: dep |
| 24 | ; CHECK: 1,2: ind |
| 25 | %i.next = add i64 %i, 1 |
| 26 | %exitcond = icmp eq i64 %i.next, 256 |
| 27 | br i1 %exitcond, label %for.end, label %for.body |
| 28 | |
| 29 | for.end: |
| 30 | ret void |
| 31 | } |
| 32 | |
| 33 | ; // the same example, using more realistic IR |
| 34 | ; for (i = 0; i < 256; i++) |
| 35 | ; x[i] = x[256 - i] + y[i] |
| 36 | |
| 37 | define void @f2(...) nounwind { |
| 38 | entry: |
| 39 | br label %for.body |
| 40 | |
| 41 | for.body: |
| 42 | %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ] |
| 43 | %i.256 = sub i64 0, %i |
| 44 | %y.ld.addr = getelementptr [256 x i32]* @y, i64 0, i64 %i |
| 45 | %x.ld.addr = getelementptr [256 x i32]* @x, i64 1, i64 %i.256 |
| 46 | %x.st.addr = getelementptr [256 x i32]* @x, i64 0, i64 %i |
| 47 | %x = load i32* %x.ld.addr ; 0 |
| 48 | %y = load i32* %y.ld.addr ; 1 |
| 49 | %r = add i32 %y, %x |
| 50 | store i32 %r, i32* %x.st.addr ; 2 |
| 51 | ; CHECK: 0,2: dep |
| 52 | ; CHECK: 1,2: ind |
| 53 | %i.next = add i64 %i, 1 |
| 54 | %exitcond = icmp eq i64 %i.next, 256 |
| 55 | br i1 %exitcond, label %for.end, label %for.body |
| 56 | |
| 57 | for.end: |
| 58 | ret void |
| 59 | } |
| 60 | |
| 61 | ; for (i = 0; i < 100; i++) |
| 62 | ; x[i] = x[256 - i] + y[i] |
| 63 | |
| 64 | define void @f3(...) nounwind { |
| 65 | entry: |
| 66 | br label %for.body |
| 67 | |
| 68 | for.body: |
| 69 | %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ] |
| 70 | %i.256 = sub i64 0, %i |
| 71 | %y.ld.addr = getelementptr [256 x i32]* @y, i64 0, i64 %i |
| 72 | %x.ld.addr = getelementptr [256 x i32]* @x, i64 1, i64 %i.256 |
| 73 | %x.st.addr = getelementptr [256 x i32]* @x, i64 0, i64 %i |
| 74 | %x = load i32* %x.ld.addr ; 0 |
| 75 | %y = load i32* %y.ld.addr ; 1 |
| 76 | %r = add i32 %y, %x |
| 77 | store i32 %r, i32* %x.st.addr ; 2 |
| 78 | ; CHECK: 0,2: dep |
| 79 | ; CHECK: 1,2: ind |
| 80 | %i.next = add i64 %i, 1 |
| 81 | %exitcond = icmp eq i64 %i.next, 100 |
| 82 | br i1 %exitcond, label %for.end, label %for.body |
| 83 | |
| 84 | for.end: |
| 85 | ret void |
| 86 | } |