xref: /llvm-project/llvm/test/Transforms/LoopFlatten/loop-flatten-simplify-cfg.ll (revision 055fb7795aa219a3d274d280ec9129784f169f56)
1;; This test was created to ensure that the LoopFlatten pass can
2;; operate on loops that are not in simplified form before applying the pass.
3
4; RUN: opt < %s -S -passes='loop(loop-flatten),simplifycfg,verify' -verify-loop-info -verify-dom-info -verify-scev | FileCheck %s
5
6target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
7
8define void @test(i64 %N, ptr %A, i64 %val) {
9; CHECK-LABEL: @test(
10; CHECK-NEXT:  entry:
11; CHECK-NEXT:    [[CMP_NOT:%.*]] = icmp eq i64 [[N:%.*]], 0
12; CHECK-NEXT:    br i1 [[CMP_NOT]], label [[FOR_END:%.*]], label [[FOR_COND_PREHEADER_PREHEADER:%.*]]
13; CHECK:       for.cond.preheader.preheader:
14; CHECK-NEXT:    [[FLATTEN_TRIPCOUNT:%.*]] = mul i64 [[N]], [[N]]
15; CHECK-NEXT:    br label [[FOR_COND_PREHEADER:%.*]]
16; CHECK:       for.cond.preheader:
17; CHECK-NEXT:    [[I:%.*]] = phi i64 [ [[INC6:%.*]], [[FOR_COND_PREHEADER]] ], [ 0, [[FOR_COND_PREHEADER_PREHEADER]] ]
18; CHECK-NEXT:    [[MUL:%.*]] = mul i64 [[I]], [[N]]
19; CHECK-NEXT:    [[ADD:%.*]] = add i64 0, [[MUL]]
20; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i64, ptr [[A:%.*]], i64 [[I]]
21; CHECK-NEXT:    [[TMP0:%.*]] = load i64, ptr [[ARRAYIDX]], align 4
22; CHECK-NEXT:    [[ADD4:%.*]] = add nsw i64 [[TMP0]], [[VAL:%.*]]
23; CHECK-NEXT:    store i64 [[ADD4]], ptr [[ARRAYIDX]], align 4
24; CHECK-NEXT:    [[INC:%.*]] = add nuw nsw i64 0, 1
25; CHECK-NEXT:    [[CMP2:%.*]] = icmp ult i64 [[INC]], [[N]]
26; CHECK-NEXT:    [[INC6]] = add nuw nsw i64 [[I]], 1
27; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[INC6]], [[FLATTEN_TRIPCOUNT]]
28; CHECK-NEXT:    br i1 [[CMP]], label [[FOR_COND_PREHEADER]], label [[FOR_END]]
29; CHECK:       for.end:
30; CHECK-NEXT:    ret void
31;
32entry:
33  %cmp.not = icmp eq i64 %N, 0
34  br i1 %cmp.not, label %for.end, label %for.cond.preheader
35
36for.cond.preheader:
37  %i= phi i64 [ %inc6, %for.cond.for.inc_crit_edge ], [ 0, %entry ]
38  %mul = mul i64 %i, %N
39  br label %for.body
40
41for.body:
42  %j = phi i64 [ 0, %for.cond.preheader ], [ %inc, %for.body ]
43  %add = add i64 %j, %mul
44  %arrayidx = getelementptr inbounds i64, ptr %A, i64 %add
45  %0 = load i64, ptr %arrayidx, align 4
46  %add4 = add nsw i64 %0, %val
47  store i64 %add4, ptr %arrayidx, align 4
48  %inc = add nuw nsw i64 %j, 1
49  %cmp2 = icmp ult i64 %inc, %N
50  br i1 %cmp2, label %for.body, label %for.cond.for.inc_crit_edge
51
52for.cond.for.inc_crit_edge:
53  %inc6 = add nuw nsw i64 %i, 1
54  %cmp = icmp ult i64 %inc6, %N
55  br i1 %cmp, label %for.cond.preheader, label %for.end
56
57for.end:
58  ret void
59}
60