1 ; RUN: opt < %s -analyze -scalar-evolution \ 2 ; RUN: | grep {Loop %for\\.body: backedge-taken count is (-1 + \[%\]ecx)} 3 ; PR4599 4 5 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" 6 7 define i32 @foo(i32 %ecx) nounwind { 8 entry: 9 %cmp2 = icmp eq i32 %ecx, 0 ; <i1> [#uses=1] 10 br i1 %cmp2, label %for.end, label %bb.nph 11 12 for.cond: ; preds = %for.inc 13 %cmp = icmp ult i32 %inc, %ecx ; <i1> [#uses=1] 14 br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge 15 16 for.cond.for.end_crit_edge: ; preds = %for.cond 17 %phitmp = add i32 %i.01, 2 ; <i32> [#uses=1] 18 br label %for.end 19 20 bb.nph: ; preds = %entry 21 br label %for.body 22 23 for.body: ; preds = %bb.nph, %for.cond 24 %i.01 = phi i32 [ %inc, %for.cond ], [ 0, %bb.nph ] ; <i32> [#uses=3] 25 %call = call i32 @bar(i32 %i.01) nounwind ; <i32> [#uses=0] 26 br label %for.inc 27 28 for.inc: ; preds = %for.body 29 %inc = add i32 %i.01, 1 ; <i32> [#uses=2] 30 br label %for.cond 31 32 for.end: ; preds = %for.cond.for.end_crit_edge, %entry 33 %i.0.lcssa = phi i32 [ %phitmp, %for.cond.for.end_crit_edge ], [ 1, %entry ] ; <i32> [#uses=1] 34 ret i32 %i.0.lcssa 35 } 36 37 declare i32 @bar(i32) 38
