1 ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s 2 3 ; CHECK: Determining loop execution counts for: @test 4 ; CHECK: Loop %for.body: backedge-taken count is ((-2 + %len) /u 2) 5 ; CHECK: Loop %for.body: max backedge-taken count is 1073741823 6 7 define zeroext i16 @test(i16* nocapture %p, i32 %len) nounwind readonly { 8 entry: 9 %cmp2 = icmp sgt i32 %len, 1 10 br i1 %cmp2, label %for.body.preheader, label %for.end 11 12 for.body.preheader: ; preds = %entry 13 br label %for.body 14 15 for.body: ; preds = %for.body, %for.body.preheader 16 %p.addr.05 = phi i16* [ %incdec.ptr, %for.body ], [ %p, %for.body.preheader ] 17 %len.addr.04 = phi i32 [ %sub, %for.body ], [ %len, %for.body.preheader ] 18 %res.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ] 19 %incdec.ptr = getelementptr inbounds i16, i16* %p.addr.05, i32 1 20 %0 = load i16, i16* %p.addr.05, align 2 21 %conv = zext i16 %0 to i32 22 %add = add i32 %conv, %res.03 23 %sub = add nsw i32 %len.addr.04, -2 24 %cmp = icmp sgt i32 %sub, 1 25 br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge 26 27 for.cond.for.end_crit_edge: ; preds = %for.body 28 %extract.t = trunc i32 %add to i16 29 br label %for.end 30 31 for.end: ; preds = %for.cond.for.end_crit_edge, %entry 32 %res.0.lcssa.off0 = phi i16 [ %extract.t, %for.cond.for.end_crit_edge ], [ 0, %entry ] 33 ret i16 %res.0.lcssa.off0 34 } 35 36
