1 ; RUN: opt < %s -S -loop-unroll -unroll-threshold=50 -unroll-runtime -unroll-count=8 | FileCheck %s 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 6 ; CHECK: unr.cmp: 7 ; CHECK: for.body.unr: 8 ; CHECK: for.body: 9 ; CHECK: br i1 %exitcond.3, label %for.end.loopexit{{.*}}, label %for.body 10 ; CHECK-NOT: br i1 %exitcond.4, label %for.end.loopexit{{.*}}, label %for.body 11 12 define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly { 13 entry: 14 %cmp1 = icmp eq i32 %n, 0 15 br i1 %cmp1, label %for.end, label %for.body 16 17 for.body: ; preds = %for.body, %entry 18 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] 19 %sum.02 = phi i32 [ %add, %for.body ], [ 0, %entry ] 20 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv 21 %0 = load i32* %arrayidx, align 4 22 %add = add nsw i32 %0, %sum.02 23 %indvars.iv.next = add i64 %indvars.iv, 1 24 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 25 %exitcond = icmp eq i32 %lftr.wideiv, %n 26 br i1 %exitcond, label %for.end, label %for.body 27 28 for.end: ; preds = %for.body, %entry 29 %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ] 30 ret i32 %sum.0.lcssa 31 } 32
