| Sanjoy Das | 664c925 | 2017-03-03 18:19:15 +0000 | [diff] [blame^] | 1 | ; RUN: opt < %s -S -loop-unroll | FileCheck %s |
| 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 |
| 21 | br i1 %cmp, label %loop, label %exit |
| 22 | |
| 23 | exit: |
| 24 | ret i32 %sum |
| 25 | } |