source: icGREP/icgrep-devel/llvm-3.8.0.src/test/Analysis/ScalarEvolution/trip-count12.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

Upgrade to llvm 3.8

File size: 1.4 KB
Line 
1; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
2
3; CHECK: Determining loop execution counts for: @test
4; CHECK: Loop %for.body: backedge-taken count is ((-2 + %len) /u 2)
5; CHECK: Loop %for.body: max backedge-taken count is 1073741823
6
7define zeroext i16 @test(i16* nocapture %p, i32 %len) nounwind readonly {
8entry:
9  %cmp2 = icmp sgt i32 %len, 1
10  br i1 %cmp2, label %for.body.preheader, label %for.end
11
12for.body.preheader:                               ; preds = %entry
13  br label %for.body
14
15for.body:                                         ; preds = %for.body, %for.body.preheader
16  %p.addr.05 = phi i16* [ %incdec.ptr, %for.body ], [ %p, %for.body.preheader ]
17  %len.addr.04 = phi i32 [ %sub, %for.body ], [ %len, %for.body.preheader ]
18  %res.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
19  %incdec.ptr = getelementptr inbounds i16, i16* %p.addr.05, i32 1
20  %0 = load i16, i16* %p.addr.05, align 2
21  %conv = zext i16 %0 to i32
22  %add = add i32 %conv, %res.03
23  %sub = add nsw i32 %len.addr.04, -2
24  %cmp = icmp sgt i32 %sub, 1
25  br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
26
27for.cond.for.end_crit_edge:                       ; preds = %for.body
28  %extract.t = trunc i32 %add to i16
29  br label %for.end
30
31for.end:                                          ; preds = %for.cond.for.end_crit_edge, %entry
32  %res.0.lcssa.off0 = phi i16 [ %extract.t, %for.cond.for.end_crit_edge ], [ 0, %entry ]
33  ret i16 %res.0.lcssa.off0
34}
35
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