| Dan Gohman | 8a977e2 | 2010-01-26 19:25:59 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -analyze -scalar-evolution \ |
| Chandler Carruth | 4177e6f | 2012-07-02 12:47:22 +0000 | [diff] [blame] | 2 | ; RUN: | grep "Loop %for\.body: backedge-taken count is (-1 + [%]ecx)" |
| Dan Gohman | 0f4b285 | 2009-07-21 23:03:19 +0000 | [diff] [blame] | 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) |