1; RUN: opt < %s -S -analyze -scalar-evolution | FileCheck %s
2
3; ScalarEvolution should be able to fold away the sign-extensions
4; on this loop with a primary induction variable incremented with
5; a nsw add of 2.
6
7target 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"
8
9define void @foo(i32 %no, double* nocapture %d, double* nocapture %q) nounwind {
10entry:
11  %n = and i32 %no, 4294967294
12  %0 = icmp sgt i32 %n, 0                         ; <i1> [#uses=1]
13  br i1 %0, label %bb.nph, label %return
14
15bb.nph:                                           ; preds = %entry
16  br label %bb
17
18bb:                                               ; preds = %bb.nph, %bb1
19  %i.01 = phi i32 [ %16, %bb1 ], [ 0, %bb.nph ]   ; <i32> [#uses=5]
20
21; CHECK: %1 = sext i32 %i.01 to i64
22; CHECK: -->  {0,+,2}<nuw><nsw><%bb>
23  %1 = sext i32 %i.01 to i64                      ; <i64> [#uses=1]
24
25; CHECK: %2 = getelementptr inbounds double* %d, i64 %1
26; CHECK: -->  {%d,+,16}<nsw><%bb>
27  %2 = getelementptr inbounds double* %d, i64 %1  ; <double*> [#uses=1]
28
29  %3 = load double* %2, align 8                   ; <double> [#uses=1]
30  %4 = sext i32 %i.01 to i64                      ; <i64> [#uses=1]
31  %5 = getelementptr inbounds double* %q, i64 %4  ; <double*> [#uses=1]
32  %6 = load double* %5, align 8                   ; <double> [#uses=1]
33  %7 = or i32 %i.01, 1                            ; <i32> [#uses=1]
34
35; CHECK: %8 = sext i32 %7 to i64
36; CHECK: -->  {1,+,2}<nuw><nsw><%bb>
37  %8 = sext i32 %7 to i64                         ; <i64> [#uses=1]
38
39; CHECK: %9 = getelementptr inbounds double* %q, i64 %8
40; CHECK: {(8 + %q),+,16}<nsw><%bb>
41  %9 = getelementptr inbounds double* %q, i64 %8  ; <double*> [#uses=1]
42
43; Artificially repeat the above three instructions, this time using
44; add nsw instead of or.
45  %t7 = add nsw i32 %i.01, 1                            ; <i32> [#uses=1]
46
47; CHECK: %t8 = sext i32 %t7 to i64
48; CHECK: -->  {1,+,2}<nuw><nsw><%bb>
49  %t8 = sext i32 %t7 to i64                         ; <i64> [#uses=1]
50
51; CHECK: %t9 = getelementptr inbounds double* %q, i64 %t8
52; CHECK: {(8 + %q),+,16}<nsw><%bb>
53  %t9 = getelementptr inbounds double* %q, i64 %t8  ; <double*> [#uses=1]
54
55  %10 = load double* %9, align 8                  ; <double> [#uses=1]
56  %11 = fadd double %6, %10                       ; <double> [#uses=1]
57  %12 = fadd double %11, 3.200000e+00             ; <double> [#uses=1]
58  %13 = fmul double %3, %12                       ; <double> [#uses=1]
59  %14 = sext i32 %i.01 to i64                     ; <i64> [#uses=1]
60  %15 = getelementptr inbounds double* %d, i64 %14 ; <double*> [#uses=1]
61  store double %13, double* %15, align 8
62  %16 = add nsw i32 %i.01, 2                      ; <i32> [#uses=2]
63  br label %bb1
64
65bb1:                                              ; preds = %bb
66  %17 = icmp slt i32 %16, %n                      ; <i1> [#uses=1]
67  br i1 %17, label %bb, label %bb1.return_crit_edge
68
69bb1.return_crit_edge:                             ; preds = %bb1
70  br label %return
71
72return:                                           ; preds = %bb1.return_crit_edge, %entry
73  ret void
74}
75
76; CHECK: Loop %bb: backedge-taken count is ((-1 + (2 * (%no /u 2))) /u 2)
77; CHECK: Loop %bb: max backedge-taken count is 1073741822
78