1 ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s 2 ; PR4599 3 4 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" 5 6 ; CHECK: Loop %for.body: backedge-taken count is (-1 + {{%?}}ecx) 7 8 define i32 @foo(i32 %ecx) nounwind { 9 entry: 10 %cmp2 = icmp eq i32 %ecx, 0 ; <i1> [#uses=1] 11 br i1 %cmp2, label %for.end, label %bb.nph 12 13 for.cond: ; preds = %for.inc 14 %cmp = icmp ult i32 %inc, %ecx ; <i1> [#uses=1] 15 br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge 16 17 for.cond.for.end_crit_edge: ; preds = %for.cond 18 %phitmp = add i32 %i.01, 2 ; <i32> [#uses=1] 19 br label %for.end 20 21 bb.nph: ; preds = %entry 22 br label %for.body 23 24 for.body: ; preds = %bb.nph, %for.cond 25 %i.01 = phi i32 [ %inc, %for.cond ], [ 0, %bb.nph ] ; <i32> [#uses=3] 26 %call = call i32 @bar(i32 %i.01) nounwind ; <i32> [#uses=0] 27 br label %for.inc 28 29 for.inc: ; preds = %for.body 30 %inc = add i32 %i.01, 1 ; <i32> [#uses=2] 31 br label %for.cond 32 33 for.end: ; preds = %for.cond.for.end_crit_edge, %entry 34 %i.0.lcssa = phi i32 [ %phitmp, %for.cond.for.end_crit_edge ], [ 1, %entry ] ; <i32> [#uses=1] 35 ret i32 %i.0.lcssa 36 } 37 38 declare i32 @bar(i32) 39
