| Hal Finkel | 38dd590 | 2015-01-10 00:30:55 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -S -loop-unroll -unroll-threshold=25 -unroll-runtime -unroll-count=8 | FileCheck %s |
| Andrew Trick | d04d1529 | 2011-12-09 06:19:40 +0000 | [diff] [blame] | 2 | |
| 3 | ; Choose a smaller, power-of-two, unroll count if the loop is too large. |
| 4 | ; This test makes sure we're not unrolling 'odd' counts |
| 5 | |
| Kevin Qin | fc02e3c | 2014-09-29 11:15:00 +0000 | [diff] [blame] | 6 | ; CHECK: for.body.prol: |
| Andrew Trick | d04d1529 | 2011-12-09 06:19:40 +0000 | [diff] [blame] | 7 | ; CHECK: for.body: |
| 8 | ; CHECK: br i1 %exitcond.3, label %for.end.loopexit{{.*}}, label %for.body |
| 9 | ; CHECK-NOT: br i1 %exitcond.4, label %for.end.loopexit{{.*}}, label %for.body |
| 10 | |
| 11 | define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly { |
| 12 | entry: |
| 13 | %cmp1 = icmp eq i32 %n, 0 |
| 14 | br i1 %cmp1, label %for.end, label %for.body |
| 15 | |
| 16 | for.body: ; preds = %for.body, %entry |
| 17 | %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] |
| 18 | %sum.02 = phi i32 [ %add, %for.body ], [ 0, %entry ] |
| 19 | %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv |
| 20 | %0 = load i32* %arrayidx, align 4 |
| 21 | %add = add nsw i32 %0, %sum.02 |
| 22 | %indvars.iv.next = add i64 %indvars.iv, 1 |
| 23 | %lftr.wideiv = trunc i64 %indvars.iv.next to i32 |
| 24 | %exitcond = icmp eq i32 %lftr.wideiv, %n |
| 25 | br i1 %exitcond, label %for.end, label %for.body |
| 26 | |
| 27 | for.end: ; preds = %for.body, %entry |
| 28 | %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ] |
| 29 | ret i32 %sum.0.lcssa |
| 30 | } |