1 ; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
2 ; RUN: opt < %s -S -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s
4 ; ScalarEvolution should be able to fold away the sign-extensions
5 ; on this loop with a primary induction variable incremented with
6 ; a nsw add of 2 (this test is derived from the nsw-offset.ll test, but uses an
7 ; assume instead of a preheader conditional branch to guard the loop).
9 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"
11 ; Note: Without the preheader assume, there is an 'smax' in the
12 ; backedge-taken count expression:
13 define void @foo(i32 %no, ptr nocapture %d, ptr nocapture %q) nounwind {
15 ; CHECK-NEXT: Classifying expressions for: @foo
16 ; CHECK-NEXT: %n = and i32 %no, -2
17 ; CHECK-NEXT: --> (2 * (%no /u 2))<nuw> U: [0,-1) S: [-2147483648,2147483647)
18 ; CHECK-NEXT: %i.01 = phi i32 [ %16, %bb1 ], [ 0, %bb.nph ]
19 ; CHECK-NEXT: --> {0,+,2}<nuw><nsw><%bb> U: [0,2147483645) S: [0,2147483645) Exits: (2 * ((-1 + (2 * (%no /u 2))<nuw>) /u 2))<nuw> LoopDispositions: { %bb: Computable }
20 ; CHECK-NEXT: %1 = sext i32 %i.01 to i64
21 ; CHECK-NEXT: --> {0,+,2}<nuw><nsw><%bb> U: [0,2147483645) S: [0,2147483645) Exits: (2 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> LoopDispositions: { %bb: Computable }
22 ; CHECK-NEXT: %2 = getelementptr inbounds double, ptr %d, i64 %1
23 ; CHECK-NEXT: --> {%d,+,16}<nuw><%bb> U: full-set S: full-set Exits: ((16 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> + %d) LoopDispositions: { %bb: Computable }
24 ; CHECK-NEXT: %4 = sext i32 %i.01 to i64
25 ; CHECK-NEXT: --> {0,+,2}<nuw><nsw><%bb> U: [0,2147483645) S: [0,2147483645) Exits: (2 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> LoopDispositions: { %bb: Computable }
26 ; CHECK-NEXT: %5 = getelementptr inbounds double, ptr %q, i64 %4
27 ; CHECK-NEXT: --> {%q,+,16}<nuw><%bb> U: full-set S: full-set Exits: ((16 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> + %q) LoopDispositions: { %bb: Computable }
28 ; CHECK-NEXT: %7 = or disjoint i32 %i.01, 1
29 ; CHECK-NEXT: --> {1,+,2}<nuw><nsw><%bb> U: [1,2147483646) S: [1,2147483646) Exits: (1 + (2 * ((-1 + (2 * (%no /u 2))<nuw>) /u 2))<nuw>)<nuw><nsw> LoopDispositions: { %bb: Computable }
30 ; CHECK-NEXT: %8 = sext i32 %7 to i64
31 ; CHECK-NEXT: --> {1,+,2}<nuw><nsw><%bb> U: [1,2147483646) S: [1,2147483646) Exits: (1 + (2 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw>)<nuw><nsw> LoopDispositions: { %bb: Computable }
32 ; CHECK-NEXT: %9 = getelementptr inbounds double, ptr %q, i64 %8
33 ; CHECK-NEXT: --> {(8 + %q),+,16}<nuw><%bb> U: full-set S: full-set Exits: (8 + (16 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> + %q) LoopDispositions: { %bb: Computable }
34 ; CHECK-NEXT: %t7 = add nsw i32 %i.01, 1
35 ; CHECK-NEXT: --> {1,+,2}<nuw><nsw><%bb> U: [1,2147483646) S: [1,2147483646) Exits: (1 + (2 * ((-1 + (2 * (%no /u 2))<nuw>) /u 2))<nuw>)<nuw><nsw> LoopDispositions: { %bb: Computable }
36 ; CHECK-NEXT: %t8 = sext i32 %t7 to i64
37 ; CHECK-NEXT: --> {1,+,2}<nuw><nsw><%bb> U: [1,2147483646) S: [1,2147483646) Exits: (1 + (2 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw>)<nuw><nsw> LoopDispositions: { %bb: Computable }
38 ; CHECK-NEXT: %t9 = getelementptr inbounds double, ptr %q, i64 %t8
39 ; CHECK-NEXT: --> {(8 + %q),+,16}<nuw><%bb> U: full-set S: full-set Exits: (8 + (16 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> + %q) LoopDispositions: { %bb: Computable }
40 ; CHECK-NEXT: %14 = sext i32 %i.01 to i64
41 ; CHECK-NEXT: --> {0,+,2}<nuw><nsw><%bb> U: [0,2147483645) S: [0,2147483645) Exits: (2 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> LoopDispositions: { %bb: Computable }
42 ; CHECK-NEXT: %15 = getelementptr inbounds double, ptr %d, i64 %14
43 ; CHECK-NEXT: --> {%d,+,16}<nuw><%bb> U: full-set S: full-set Exits: ((16 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> + %d) LoopDispositions: { %bb: Computable }
44 ; CHECK-NEXT: %16 = add nsw i32 %i.01, 2
45 ; CHECK-NEXT: --> {2,+,2}<nuw><nsw><%bb> U: [2,2147483647) S: [2,2147483647) Exits: (2 + (2 * ((-1 + (2 * (%no /u 2))<nuw>) /u 2))<nuw>) LoopDispositions: { %bb: Computable }
46 ; CHECK-NEXT: Determining loop execution counts for: @foo
47 ; CHECK-NEXT: Loop %bb: backedge-taken count is ((-1 + (2 * (%no /u 2))<nuw>) /u 2)
48 ; CHECK-NEXT: Loop %bb: constant max backedge-taken count is 1073741822
49 ; CHECK-NEXT: Loop %bb: symbolic max backedge-taken count is ((-1 + (2 * (%no /u 2))<nuw>) /u 2)
50 ; CHECK-NEXT: Loop %bb: Predicated backedge-taken count is ((-1 + (2 * (%no /u 2))<nuw>) /u 2)
51 ; CHECK-NEXT: Predicates:
52 ; CHECK-NEXT: Loop %bb: Trip multiple is 1
55 %n = and i32 %no, 4294967294
56 %0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1]
57 tail call void @llvm.assume(i1 %0)
60 bb.nph: ; preds = %entry
63 bb: ; preds = %bb.nph, %bb1
64 %i.01 = phi i32 [ %16, %bb1 ], [ 0, %bb.nph ] ; <i32> [#uses=5]
66 %1 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
68 %2 = getelementptr inbounds double, ptr %d, i64 %1 ; <ptr> [#uses=1]
70 %3 = load double, ptr %2, align 8 ; <double> [#uses=1]
71 %4 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
72 %5 = getelementptr inbounds double, ptr %q, i64 %4 ; <ptr> [#uses=1]
73 %6 = load double, ptr %5, align 8 ; <double> [#uses=1]
74 %7 = or disjoint i32 %i.01, 1 ; <i32> [#uses=1]
76 %8 = sext i32 %7 to i64 ; <i64> [#uses=1]
78 %9 = getelementptr inbounds double, ptr %q, i64 %8 ; <ptr> [#uses=1]
80 ; Artificially repeat the above three instructions, this time using
81 ; add nsw instead of or.
82 %t7 = add nsw i32 %i.01, 1 ; <i32> [#uses=1]
84 %t8 = sext i32 %t7 to i64 ; <i64> [#uses=1]
86 %t9 = getelementptr inbounds double, ptr %q, i64 %t8 ; <ptr> [#uses=1]
88 %10 = load double, ptr %9, align 8 ; <double> [#uses=1]
89 %11 = fadd double %6, %10 ; <double> [#uses=1]
90 %12 = fadd double %11, 3.200000e+00 ; <double> [#uses=1]
91 %13 = fmul double %3, %12 ; <double> [#uses=1]
92 %14 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
93 %15 = getelementptr inbounds double, ptr %d, i64 %14 ; <ptr> [#uses=1]
94 store double %13, ptr %15, align 8
95 %16 = add nsw i32 %i.01, 2 ; <i32> [#uses=2]
99 %17 = icmp slt i32 %16, %n ; <i1> [#uses=1]
100 br i1 %17, label %bb, label %bb1.return_crit_edge
102 bb1.return_crit_edge: ; preds = %bb1
105 return: ; preds = %bb1.return_crit_edge, %entry
109 declare void @llvm.assume(i1) nounwind