1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -loop-reduce -S | FileCheck %s
3
4target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
5target triple = "riscv64"
6
7
8define void @icmp_zero(i64 %N, ptr %p) {
9; CHECK-LABEL: @icmp_zero(
10; CHECK-NEXT:  entry:
11; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
12; CHECK:       vector.body:
13; CHECK-NEXT:    [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], [[VECTOR_BODY]] ], [ [[N:%.*]], [[ENTRY:%.*]] ]
14; CHECK-NEXT:    store i64 0, ptr [[P:%.*]], align 8
15; CHECK-NEXT:    [[LSR_IV_NEXT]] = add i64 [[LSR_IV]], -2
16; CHECK-NEXT:    [[DONE:%.*]] = icmp eq i64 [[LSR_IV_NEXT]], 0
17; CHECK-NEXT:    br i1 [[DONE]], label [[EXIT:%.*]], label [[VECTOR_BODY]]
18; CHECK:       exit:
19; CHECK-NEXT:    ret void
20;
21entry:
22  br label %vector.body
23
24vector.body:
25  %iv = phi i64 [ 0, %entry ], [ %iv.next, %vector.body ]
26  store i64 0, ptr %p
27  %iv.next = add i64 %iv, 2
28  %done = icmp eq i64 %iv.next, %N
29  br i1 %done, label %exit, label %vector.body
30
31exit:
32  ret void
33}
34
35define void @icmp_zero_urem_nonzero_con(i64 %N, ptr %p) {
36; CHECK-LABEL: @icmp_zero_urem_nonzero_con(
37; CHECK-NEXT:  entry:
38; CHECK-NEXT:    [[UREM:%.*]] = urem i64 [[N:%.*]], 16
39; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
40; CHECK:       vector.body:
41; CHECK-NEXT:    [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], [[VECTOR_BODY]] ], [ [[UREM]], [[ENTRY:%.*]] ]
42; CHECK-NEXT:    store i64 0, ptr [[P:%.*]], align 8
43; CHECK-NEXT:    [[LSR_IV_NEXT]] = add i64 [[LSR_IV]], -2
44; CHECK-NEXT:    [[DONE:%.*]] = icmp eq i64 [[LSR_IV_NEXT]], 0
45; CHECK-NEXT:    br i1 [[DONE]], label [[EXIT:%.*]], label [[VECTOR_BODY]]
46; CHECK:       exit:
47; CHECK-NEXT:    ret void
48;
49entry:
50  %urem = urem i64 %N, 16
51  br label %vector.body
52
53vector.body:
54  %iv = phi i64 [ 0, %entry ], [ %iv.next, %vector.body ]
55  store i64 0, ptr %p
56  %iv.next = add i64 %iv, 2
57  %done = icmp eq i64 %iv.next, %urem
58  br i1 %done, label %exit, label %vector.body
59
60exit:
61  ret void
62}
63
64; FIXME: We could handle this case even though we don't know %M.  The
65; faulting instruction is already outside the loop!
66define void @icmp_zero_urem_invariant(i64 %N, i64 %M, ptr %p) {
67; CHECK-LABEL: @icmp_zero_urem_invariant(
68; CHECK-NEXT:  entry:
69; CHECK-NEXT:    [[UREM:%.*]] = urem i64 [[N:%.*]], [[M:%.*]]
70; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
71; CHECK:       vector.body:
72; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[VECTOR_BODY]] ]
73; CHECK-NEXT:    store i64 0, ptr [[P:%.*]], align 8
74; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 2
75; CHECK-NEXT:    [[DONE:%.*]] = icmp eq i64 [[IV_NEXT]], [[UREM]]
76; CHECK-NEXT:    br i1 [[DONE]], label [[EXIT:%.*]], label [[VECTOR_BODY]]
77; CHECK:       exit:
78; CHECK-NEXT:    ret void
79;
80entry:
81  %urem = urem i64 %N, %M
82  br label %vector.body
83
84vector.body:
85  %iv = phi i64 [ 0, %entry ], [ %iv.next, %vector.body ]
86  store i64 0, ptr %p
87  %iv.next = add i64 %iv, 2
88  %done = icmp eq i64 %iv.next, %urem
89  br i1 %done, label %exit, label %vector.body
90
91exit:
92  ret void
93}
94
95; Negative test - We can not hoist because we don't know value of %M.
96define void @icmp_zero_urem_nohoist(i64 %N, i64 %M, ptr %p) {
97; CHECK-LABEL: @icmp_zero_urem_nohoist(
98; CHECK-NEXT:  entry:
99; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
100; CHECK:       vector.body:
101; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[VECTOR_BODY]] ]
102; CHECK-NEXT:    store i64 0, ptr [[P:%.*]], align 8
103; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 2
104; CHECK-NEXT:    [[UREM:%.*]] = urem i64 [[N:%.*]], [[M:%.*]]
105; CHECK-NEXT:    [[DONE:%.*]] = icmp eq i64 [[IV_NEXT]], [[UREM]]
106; CHECK-NEXT:    br i1 [[DONE]], label [[EXIT:%.*]], label [[VECTOR_BODY]]
107; CHECK:       exit:
108; CHECK-NEXT:    ret void
109;
110entry:
111  br label %vector.body
112
113vector.body:
114  %iv = phi i64 [ 0, %entry ], [ %iv.next, %vector.body ]
115  store i64 0, ptr %p
116  %iv.next = add i64 %iv, 2
117  %urem = urem i64 %N, %M
118  %done = icmp eq i64 %iv.next, %urem
119  br i1 %done, label %exit, label %vector.body
120
121exit:
122  ret void
123}
124
125define void @icmp_zero_urem_nonzero(i64 %N, i64 %M, ptr %p) {
126; CHECK-LABEL: @icmp_zero_urem_nonzero(
127; CHECK-NEXT:  entry:
128; CHECK-NEXT:    [[NONZERO:%.*]] = add nuw i64 [[M:%.*]], 1
129; CHECK-NEXT:    [[UREM:%.*]] = urem i64 [[N:%.*]], [[NONZERO]]
130; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
131; CHECK:       vector.body:
132; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[VECTOR_BODY]] ]
133; CHECK-NEXT:    store i64 0, ptr [[P:%.*]], align 8
134; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 2
135; CHECK-NEXT:    [[DONE:%.*]] = icmp eq i64 [[IV_NEXT]], [[UREM]]
136; CHECK-NEXT:    br i1 [[DONE]], label [[EXIT:%.*]], label [[VECTOR_BODY]]
137; CHECK:       exit:
138; CHECK-NEXT:    ret void
139;
140entry:
141  %nonzero = add nuw i64 %M, 1
142  %urem = urem i64 %N, %nonzero
143  br label %vector.body
144
145vector.body:
146  %iv = phi i64 [ 0, %entry ], [ %iv.next, %vector.body ]
147  store i64 0, ptr %p
148  %iv.next = add i64 %iv, 2
149  %done = icmp eq i64 %iv.next, %urem
150  br i1 %done, label %exit, label %vector.body
151
152exit:
153  ret void
154}
155
156; FIXME: We can hoist this because vscale is never equal to zero
157define void @icmp_zero_urem_vscale(i64 %N, ptr %p) {
158; CHECK-LABEL: @icmp_zero_urem_vscale(
159; CHECK-NEXT:  entry:
160; CHECK-NEXT:    [[VSCALE:%.*]] = call i64 @llvm.vscale.i64()
161; CHECK-NEXT:    [[UREM:%.*]] = urem i64 [[N:%.*]], [[VSCALE]]
162; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
163; CHECK:       vector.body:
164; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[VECTOR_BODY]] ]
165; CHECK-NEXT:    store i64 0, ptr [[P:%.*]], align 8
166; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 2
167; CHECK-NEXT:    [[DONE:%.*]] = icmp eq i64 [[IV_NEXT]], [[UREM]]
168; CHECK-NEXT:    br i1 [[DONE]], label [[EXIT:%.*]], label [[VECTOR_BODY]]
169; CHECK:       exit:
170; CHECK-NEXT:    ret void
171;
172entry:
173  %vscale = call i64 @llvm.vscale.i64()
174  %urem = urem i64 %N, %vscale
175  br label %vector.body
176
177vector.body:
178  %iv = phi i64 [ 0, %entry ], [ %iv.next, %vector.body ]
179  store i64 0, ptr %p
180  %iv.next = add i64 %iv, 2
181  %done = icmp eq i64 %iv.next, %urem
182  br i1 %done, label %exit, label %vector.body
183
184exit:
185  ret void
186}
187
188declare i64 @llvm.vscale.i64()
189