1 ; RUN: opt < %s -S -unroll-threshold=20 -loop-unroll -unroll-allow-partial -unroll-runtime -unroll-allow-remainder -unroll-dynamic-cost-savings-discount=0 | FileCheck %s 2 3 ; The Loop TripCount is 9. However unroll factors 3 or 9 exceed given threshold. 4 ; The test checks that we choose a smaller, power-of-two, unroll count and do not give up on unrolling. 5 6 ; CHECK: for.body: 7 ; CHECK: store 8 ; CHECK: for.body.1: 9 ; CHECK: store 10 11 define void @foo(i32* nocapture %a, i32* nocapture readonly %b) nounwind uwtable { 12 entry: 13 br label %for.body 14 15 for.body: ; preds = %for.body, %entry 16 %indvars.iv = phi i64 [ 1, %entry ], [ %indvars.iv.next, %for.body ] 17 %arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv 18 %ld = load i32, i32* %arrayidx, align 4 19 %idxprom1 = sext i32 %ld to i64 20 %arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %idxprom1 21 %st = trunc i64 %indvars.iv to i32 22 store i32 %st, i32* %arrayidx2, align 4 23 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 24 %exitcond = icmp eq i64 %indvars.iv.next, 10 25 br i1 %exitcond, label %for.end, label %for.body 26 27 for.end: ; preds = %for.body 28 ret void 29 } 30
