| ; RUN: opt < %s -analyze -scalar-evolution \ |
| ; RUN: | grep {Loop %for\\.body: backedge-taken count is (-1 + \[%\]ecx)} |
| ; PR4599 |
| |
| target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128" |
| |
| define i32 @foo(i32 %ecx) nounwind { |
| entry: |
| %cmp2 = icmp eq i32 %ecx, 0 ; <i1> [#uses=1] |
| br i1 %cmp2, label %for.end, label %bb.nph |
| |
| for.cond: ; preds = %for.inc |
| %cmp = icmp ult i32 %inc, %ecx ; <i1> [#uses=1] |
| br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge |
| |
| for.cond.for.end_crit_edge: ; preds = %for.cond |
| %phitmp = add i32 %i.01, 2 ; <i32> [#uses=1] |
| br label %for.end |
| |
| bb.nph: ; preds = %entry |
| br label %for.body |
| |
| for.body: ; preds = %bb.nph, %for.cond |
| %i.01 = phi i32 [ %inc, %for.cond ], [ 0, %bb.nph ] ; <i32> [#uses=3] |
| %call = call i32 @bar(i32 %i.01) nounwind ; <i32> [#uses=0] |
| br label %for.inc |
| |
| for.inc: ; preds = %for.body |
| %inc = add i32 %i.01, 1 ; <i32> [#uses=2] |
| br label %for.cond |
| |
| for.end: ; preds = %for.cond.for.end_crit_edge, %entry |
| %i.0.lcssa = phi i32 [ %phitmp, %for.cond.for.end_crit_edge ], [ 1, %entry ] ; <i32> [#uses=1] |
| ret i32 %i.0.lcssa |
| } |
| |
| declare i32 @bar(i32) |
