1 ; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s
3 target triple = "x86_64-unknown-linux-gnu"
5 ; CHECK-LABEL: Printing analysis 'Scalar Evolution Analysis' for function 'f0':
6 ; CHECK-NEXT: Classifying expressions for: @f0
7 ; CHECK-NEXT: %v0 = phi i16 [ 2, %b0 ], [ %v2, %b1 ]
8 ; CHECK-NEXT: --> {2,+,1}<nuw><nsw><%b1> U: [2,4) S: [2,4) Exits: 3 LoopDispositions: { %b1: Computable }
9 ; CHECK-NEXT: %v1 = phi i16 [ 1, %b0 ], [ %v3, %b1 ]
10 ; CHECK-NEXT: --> {1,+,2,+,1}<%b1> U: full-set S: full-set Exits: 3 LoopDispositions: { %b1: Computable }
11 ; CHECK-NEXT: %v2 = add nsw i16 %v0, 1
12 ; CHECK-NEXT: --> {3,+,1}<nuw><nsw><%b1> U: [3,5) S: [3,5) Exits: 4 LoopDispositions: { %b1: Computable }
13 ; CHECK-NEXT: %v3 = add nsw i16 %v1, %v0
14 ; CHECK-NEXT: --> {3,+,3,+,1}<%b1> U: full-set S: full-set Exits: 6 LoopDispositions: { %b1: Computable }
15 ; CHECK-NEXT: %v4 = and i16 %v3, 1
16 ; CHECK-NEXT: --> (zext i1 {true,+,true,+,true}<%b1> to i16) U: [0,2) S: [0,2) Exits: 0 LoopDispositions: { %b1: Computable }
17 ; CHECK-NEXT: Determining loop execution counts for: @f0
18 ; CHECK-NEXT: Loop %b1: backedge-taken count is 1
19 ; CHECK-NEXT: Loop %b1: max backedge-taken count is 1
20 ; CHECK-NEXT: Loop %b1: Predicated backedge-taken count is 1
21 ; CHECK-NEXT: Predicates:
23 ; CHECK-NEXT: Loop %b1: Trip multiple is 2
28 b1: ; preds = %b1, %b0
29 %v0 = phi i16 [ 2, %b0 ], [ %v2, %b1 ]
30 %v1 = phi i16 [ 1, %b0 ], [ %v3, %b1 ]
31 %v2 = add nsw i16 %v0, 1
32 %v3 = add nsw i16 %v1, %v0
34 %v5 = icmp ne i16 %v4, 0
35 br i1 %v5, label %b1, label %b2
41 @g0 = common dso_local global i16 0, align 2
42 @g1 = common dso_local global i32 0, align 4
43 @g2 = common dso_local global i32* null, align 8
45 ; CHECK-LABEL: Printing analysis 'Scalar Evolution Analysis' for function 'f1':
46 ; CHECK-NEXT: Classifying expressions for: @f1
47 ; CHECK-NEXT: %v0 = phi i16 [ 0, %b0 ], [ %v3, %b1 ]
48 ; CHECK-NEXT: --> {0,+,3,+,1}<%b1> U: full-set S: full-set Exits: 7 LoopDispositions: { %b1: Computable }
49 ; CHECK-NEXT: %v1 = phi i32 [ 3, %b0 ], [ %v6, %b1 ]
50 ; CHECK-NEXT: --> {3,+,1}<nuw><nsw><%b1> U: [3,6) S: [3,6) Exits: 5 LoopDispositions: { %b1: Computable }
51 ; CHECK-NEXT: %v2 = trunc i32 %v1 to i16
52 ; CHECK-NEXT: --> {3,+,1}<%b1> U: [3,6) S: [3,6) Exits: 5 LoopDispositions: { %b1: Computable }
53 ; CHECK-NEXT: %v3 = add i16 %v0, %v2
54 ; CHECK-NEXT: --> {3,+,4,+,1}<%b1> U: full-set S: full-set Exits: 12 LoopDispositions: { %b1: Computable }
55 ; CHECK-NEXT: %v4 = and i16 %v3, 1
56 ; CHECK-NEXT: --> (zext i1 {true,+,false,+,true}<%b1> to i16) U: [0,2) S: [0,2) Exits: 0 LoopDispositions: { %b1: Computable }
57 ; CHECK-NEXT: %v6 = add nuw nsw i32 %v1, 1
58 ; CHECK-NEXT: --> {4,+,1}<nuw><nsw><%b1> U: [4,7) S: [4,7) Exits: 6 LoopDispositions: { %b1: Computable }
59 ; CHECK-NEXT: %v7 = phi i32 [ %v1, %b1 ]
60 ; CHECK-NEXT: --> %v7 U: [3,6) S: [3,6)
61 ; CHECK-NEXT: %v8 = phi i16 [ %v3, %b1 ]
62 ; CHECK-NEXT: --> %v8 U: full-set S: full-set
63 ; CHECK-NEXT: Determining loop execution counts for: @f1
64 ; CHECK-NEXT: Loop %b3: <multiple exits> Unpredictable backedge-taken count.
65 ; CHECK-NEXT: Loop %b3: Unpredictable max backedge-taken count.
66 ; CHECK-NEXT: Loop %b3: Unpredictable predicated backedge-taken count.
67 ; CHECK-NEXT: Loop %b1: backedge-taken count is 2
68 ; CHECK-NEXT: Loop %b1: max backedge-taken count is 2
69 ; CHECK-NEXT: Loop %b1: Predicated backedge-taken count is 2
70 ; CHECK-NEXT: Predicates:
72 ; CHECK-NEXT: Loop %b1: Trip multiple is 3
73 define void @f1() #0 {
75 store i16 0, i16* @g0, align 2
76 store i32* @g1, i32** @g2, align 8
79 b1: ; preds = %b1, %b0
80 %v0 = phi i16 [ 0, %b0 ], [ %v3, %b1 ]
81 %v1 = phi i32 [ 3, %b0 ], [ %v6, %b1 ]
82 %v2 = trunc i32 %v1 to i16
83 %v3 = add i16 %v0, %v2
85 %v5 = icmp eq i16 %v4, 0
86 %v6 = add nuw nsw i32 %v1, 1
87 br i1 %v5, label %b2, label %b1
90 %v7 = phi i32 [ %v1, %b1 ]
91 %v8 = phi i16 [ %v3, %b1 ]
92 store i32 %v7, i32* @g1, align 4
93 store i16 %v8, i16* @g0, align 2
96 b3: ; preds = %b3, %b2
100 attributes #0 = { nounwind uwtable "target-cpu"="x86-64" }