| ; RUN: opt < %s -analyze -enable-new-pm=0 -scalar-evolution | FileCheck %s |
| ; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s |
| |
| ; CHECK: Determining loop execution counts for: @test |
| ; CHECK: Loop %for.body: backedge-taken count is ((-2 + %len) /u 2) |
| ; CHECK: Loop %for.body: max backedge-taken count is 1073741823 |
| |
| define zeroext i16 @test(i16* nocapture %p, i32 %len) nounwind readonly { |
| entry: |
| %cmp2 = icmp sgt i32 %len, 1 |
| br i1 %cmp2, label %for.body.preheader, label %for.end |
| |
| for.body.preheader: ; preds = %entry |
| br label %for.body |
| |
| for.body: ; preds = %for.body, %for.body.preheader |
| %p.addr.05 = phi i16* [ %incdec.ptr, %for.body ], [ %p, %for.body.preheader ] |
| %len.addr.04 = phi i32 [ %sub, %for.body ], [ %len, %for.body.preheader ] |
| %res.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ] |
| %incdec.ptr = getelementptr inbounds i16, i16* %p.addr.05, i32 1 |
| %0 = load i16, i16* %p.addr.05, align 2 |
| %conv = zext i16 %0 to i32 |
| %add = add i32 %conv, %res.03 |
| %sub = add nsw i32 %len.addr.04, -2 |
| %cmp = icmp sgt i32 %sub, 1 |
| br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge |
| |
| for.cond.for.end_crit_edge: ; preds = %for.body |
| %extract.t = trunc i32 %add to i16 |
| br label %for.end |
| |
| for.end: ; preds = %for.cond.for.end_crit_edge, %entry |
| %res.0.lcssa.off0 = phi i16 [ %extract.t, %for.cond.for.end_crit_edge ], [ 0, %entry ] |
| ret i16 %res.0.lcssa.off0 |
| } |
| |
