1; RUN: opt < %s  -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -enable-if-conversion -dce -instcombine -S | FileCheck %s
2
3target 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-n8:16:32:64-S128"
4
5; This is the loop in this example:
6;
7;int function0(int *a, int *b, int start, int end) {
8;
9;  for (int i=start; i<end; ++i) {
10;    unsigned k = a[i];
11;
12;    if (a[i] > b[i])   <------ notice the IF inside the loop.
13;      k = k * 5 + 3;
14;
15;    a[i] = k;  <---- K is a phi node that becomes vector-select.
16;  }
17;}
18
19;CHECK-LABEL: @function0(
20;CHECK: load <4 x i32>
21;CHECK: icmp sgt <4 x i32>
22;CHECK: mul <4 x i32>
23;CHECK: add <4 x i32>
24;CHECK: select <4 x i1>
25;CHECK: ret i32
26define i32 @function0(i32* nocapture %a, i32* nocapture %b, i32 %start, i32 %end) nounwind uwtable ssp {
27entry:
28  %cmp16 = icmp slt i32 %start, %end
29  br i1 %cmp16, label %for.body.lr.ph, label %for.end
30
31for.body.lr.ph:
32  %0 = sext i32 %start to i64
33  br label %for.body
34
35for.body:
36  %indvars.iv = phi i64 [ %0, %for.body.lr.ph ], [ %indvars.iv.next, %if.end ]
37  %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
38  %1 = load i32, i32* %arrayidx, align 4
39  %arrayidx4 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
40  %2 = load i32, i32* %arrayidx4, align 4
41  %cmp5 = icmp sgt i32 %1, %2
42  br i1 %cmp5, label %if.then, label %if.end
43
44if.then:
45  %mul = mul i32 %1, 5
46  %add = add i32 %mul, 3
47  br label %if.end
48
49if.end:
50  %k.0 = phi i32 [ %add, %if.then ], [ %1, %for.body ]
51  store i32 %k.0, i32* %arrayidx, align 4
52  %indvars.iv.next = add i64 %indvars.iv, 1
53  %3 = trunc i64 %indvars.iv.next to i32
54  %cmp = icmp slt i32 %3, %end
55  br i1 %cmp, label %for.body, label %for.end
56
57for.end:
58  ret i32 undef
59}
60
61
62
63; int func(int *A, int n) {
64;   unsigned sum = 0;
65;   for (int i = 0; i < n; ++i)
66;     if (A[i] > 30)
67;       sum += A[i] + 2;
68;
69;   return sum;
70; }
71
72;CHECK-LABEL: @reduction_func(
73;CHECK: load <4 x i32>
74;CHECK: icmp slt <4 x i32>
75;CHECK: add <4 x i32>
76;CHECK: select <4 x i1>
77;CHECK: ret i32
78define i32 @reduction_func(i32* nocapture %A, i32 %n) nounwind uwtable readonly ssp {
79entry:
80  %cmp10 = icmp sgt i32 %n, 0
81  br i1 %cmp10, label %for.body, label %for.end
82
83for.body:                                         ; preds = %entry, %for.inc
84  %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
85  %sum.011 = phi i32 [ %sum.1, %for.inc ], [ 0, %entry ]
86  %arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
87  %0 = load i32, i32* %arrayidx, align 4
88  %cmp1 = icmp sgt i32 %0, 30
89  br i1 %cmp1, label %if.then, label %for.inc
90
91if.then:                                          ; preds = %for.body
92  %add = add i32 %sum.011, 2
93  %add4 = add i32 %add, %0
94  br label %for.inc
95
96for.inc:                                          ; preds = %for.body, %if.then
97  %sum.1 = phi i32 [ %add4, %if.then ], [ %sum.011, %for.body ]
98  %indvars.iv.next = add i64 %indvars.iv, 1
99  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
100  %exitcond = icmp eq i32 %lftr.wideiv, %n
101  br i1 %exitcond, label %for.end, label %for.body
102
103for.end:                                          ; preds = %for.inc, %entry
104  %sum.0.lcssa = phi i32 [ 0, %entry ], [ %sum.1, %for.inc ]
105  ret i32 %sum.0.lcssa
106}
107
108@a = common global [1 x i32*] zeroinitializer, align 8
109@c = common global i32* null, align 8
110
111; We use to if convert this loop. This is not safe because there is a trapping
112; constant expression.
113; PR16729
114
115; CHECK-LABEL: trapping_constant_expression
116; CHECK-NOT: or <4 x i32>
117
118define i32 @trapping_constant_expression() {
119entry:
120  br label %for.body
121
122for.body:
123  %inc3 = phi i32 [ 0, %entry ], [ %inc, %cond.end ]
124  %or2 = phi i32 [ 0, %entry ], [ %or, %cond.end ]
125  br i1 icmp eq (i32** getelementptr inbounds ([1 x i32*], [1 x i32*]* @a, i64 0, i64 0), i32** @c), label %cond.false, label %cond.end
126
127cond.false:
128  br label %cond.end
129
130cond.end:
131  %cond = phi i32 [ sdiv (i32 1, i32 zext (i1 icmp eq (i32** getelementptr inbounds ([1 x i32*], [1 x i32*]* @a, i64 0, i64 0), i32** @c) to i32)), %cond.false ], [ 0, %for.body ]
132  %or = or i32 %or2, %cond
133  %inc = add nsw i32 %inc3, 1
134  %cmp = icmp slt i32 %inc, 128
135  br i1 %cmp, label %for.body, label %for.end
136
137for.end:
138  ret i32 %or
139}
140
141; Neither should we if-convert if there is an instruction operand that is a
142; trapping constant expression.
143; PR16729
144
145; CHECK-LABEL: trapping_constant_expression2
146; CHECK-NOT: or <4 x i32>
147
148define i32 @trapping_constant_expression2() {
149entry:
150  br label %for.body
151
152for.body:
153  %inc3 = phi i32 [ 0, %entry ], [ %inc, %cond.end ]
154  %or2 = phi i32 [ 0, %entry ], [ %or, %cond.end ]
155  br i1 icmp eq (i32** getelementptr inbounds ([1 x i32*], [1 x i32*]* @a, i64 0, i64 0), i32** @c), label %cond.false, label %cond.end
156
157cond.false:
158  %cond.1 = or i32 %inc3, sdiv (i32 1, i32 zext (i1 icmp eq (i32** getelementptr inbounds ([1 x i32*], [1 x i32*]* @a, i64 0, i64 1), i32** @c) to i32))
159  br label %cond.end
160
161cond.end:
162  %cond = phi i32 [ %cond.1, %cond.false ], [ %inc3, %for.body ]
163  %or = or i32 %or2, %cond
164  %inc = add nsw i32 %inc3, 1
165  %cmp = icmp slt i32 %inc, 128
166  br i1 %cmp, label %for.body, label %for.end
167
168for.end:
169  ret i32 %or
170}
171
172; Handle PHI with single incoming value having a full mask.
173; PR34523
174
175; CHECK-LABEL: PR34523
176; CHECK: vector.body
177
178define void @PR34523() {
179bb1:
180  br label %bb2
181
182bb2:                                             ; preds = %bb4, %bb1
183  %i = phi i16 [ undef, %bb1 ], [ %_tmp2, %bb4 ]
184  br label %bb3
185
186bb3:                                             ; preds = %bb2
187  %_tmp1 = phi [1 x [1 x i32]]* [ undef, %bb2 ]
188  br label %bb4
189
190bb4:                                             ; preds = %bb3
191  %_tmp2 = add i16 %i, 1
192  %_tmp3 = icmp slt i16 %_tmp2, 2
193  br i1 %_tmp3, label %bb2, label %bb5
194
195bb5:                                             ; preds = %bb4
196  unreachable
197}
198