| Sanjoy Das | 30c3538 | 2017-03-07 06:03:15 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -S -loop-unroll -unroll-threshold=4 | FileCheck %s |
| Sanjoy Das | 664c925 | 2017-03-03 18:19:15 +0000 | [diff] [blame] | 2 | |
| 3 | define i32 @invariant_backedge_1(i32 %a, i32 %b) { |
| 4 | ; CHECK-LABEL: @invariant_backedge_1 |
| 5 | ; CHECK-NOT: %plus = phi |
| 6 | ; CHECK: loop.peel: |
| 7 | ; CHECK: loop: |
| 8 | ; CHECK: %i = phi |
| 9 | ; CHECK: %sum = phi |
| 10 | entry: |
| 11 | br label %loop |
| 12 | |
| 13 | loop: |
| 14 | %i = phi i32 [ 0, %entry ], [ %inc, %loop ] |
| 15 | %sum = phi i32 [ 0, %entry ], [ %incsum, %loop ] |
| 16 | %plus = phi i32 [ %a, %entry ], [ %b, %loop ] |
| 17 | |
| 18 | %incsum = add i32 %sum, %plus |
| 19 | %inc = add i32 %i, 1 |
| 20 | %cmp = icmp slt i32 %i, 1000 |
| Sanjoy Das | 30c3538 | 2017-03-07 06:03:15 +0000 | [diff] [blame] | 21 | |
| 22 | br i1 %cmp, label %loop, label %exit |
| 23 | |
| 24 | exit: |
| 25 | ret i32 %sum |
| 26 | } |
| 27 | |
| 28 | ; Peeling should fail due to method size. |
| 29 | define i32 @invariant_backedge_2(i32 %a, i32 %b) { |
| 30 | ; CHECK-LABEL: @invariant_backedge_2 |
| 31 | ; CHECK-NOT: loop.peel: |
| 32 | ; CHECK: loop: |
| 33 | ; CHECK: %i = phi |
| 34 | ; CHECK: %sum = phi |
| 35 | ; CHECK: %plus = phi |
| 36 | entry: |
| 37 | br label %loop |
| 38 | |
| 39 | loop: |
| 40 | %i = phi i32 [ 0, %entry ], [ %inc, %loop ] |
| 41 | %sum = phi i32 [ 0, %entry ], [ %incsum2, %loop ] |
| 42 | %plus = phi i32 [ %a, %entry ], [ %b, %loop ] |
| 43 | |
| 44 | %incsum = add i32 %sum, %plus |
| 45 | %incsum2 = add i32 %incsum, %plus |
| 46 | %inc = add i32 %i, 1 |
| 47 | %cmp = icmp slt i32 %i, 1000 |
| 48 | |
| Sanjoy Das | 664c925 | 2017-03-03 18:19:15 +0000 | [diff] [blame] | 49 | br i1 %cmp, label %loop, label %exit |
| 50 | |
| 51 | exit: |
| 52 | ret i32 %sum |
| 53 | } |