1 ; RUN: opt -passes=indvars -S < %s | FileCheck %s
3 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-n8:16:32:64"
5 @main.flags = internal global [8193 x i8] zeroinitializer, align 1 ; <ptr> [#uses=5]
6 @.str = private constant [11 x i8] c"Count: %d\0A\00" ; <ptr> [#uses=1]
8 ; Indvars shouldn't emit a udiv here, because there's no udiv in the
9 ; original code. This comes from SingleSource/Benchmarks/Shootout/sieve.c.
14 define i32 @main(i32 %argc, ptr nocapture %argv) nounwind {
16 %cmp = icmp eq i32 %argc, 2 ; <i1> [#uses=1]
17 br i1 %cmp, label %cond.true, label %while.cond.preheader
19 cond.true: ; preds = %entry
20 %arrayidx = getelementptr inbounds ptr, ptr %argv, i64 1 ; <ptr> [#uses=1]
21 %tmp2 = load ptr, ptr %arrayidx ; <ptr> [#uses=1]
22 %call = tail call i32 @atoi(ptr %tmp2) nounwind readonly ; <i32> [#uses=1]
23 br label %while.cond.preheader
25 while.cond.preheader: ; preds = %entry, %cond.true
26 %NUM.0.ph = phi i32 [ %call, %cond.true ], [ 170000, %entry ] ; <i32> [#uses=2]
27 %tobool18 = icmp eq i32 %NUM.0.ph, 0 ; <i1> [#uses=1]
28 br i1 %tobool18, label %while.end, label %bb.nph30
30 while.cond.loopexit: ; preds = %for.cond12.while.cond.loopexit_crit_edge, %for.cond12.loopexit
31 %count.2.lcssa = phi i32 [ %count.1.lcssa, %for.cond12.while.cond.loopexit_crit_edge ], [ 0, %for.cond12.loopexit ] ; <i32> [#uses=1]
34 while.cond: ; preds = %while.cond.loopexit
35 %tobool = icmp eq i32 %dec19, 0 ; <i1> [#uses=1]
36 br i1 %tobool, label %while.cond.while.end_crit_edge, label %for.cond.preheader
38 while.cond.while.end_crit_edge: ; preds = %while.cond
39 %count.2.lcssa.lcssa = phi i32 [ %count.2.lcssa, %while.cond ] ; <i32> [#uses=1]
42 bb.nph30: ; preds = %while.cond.preheader
43 br label %for.cond.preheader
45 for.cond.preheader: ; preds = %bb.nph30, %while.cond
46 %dec19.in = phi i32 [ %NUM.0.ph, %bb.nph30 ], [ %dec19, %while.cond ] ; <i32> [#uses=1]
47 %dec19 = add i32 %dec19.in, -1 ; <i32> [#uses=2]
48 br i1 true, label %bb.nph, label %for.cond12.loopexit
50 for.cond: ; preds = %for.body
51 %cmp8 = icmp slt i64 %inc, 8193 ; <i1> [#uses=1]
52 br i1 %cmp8, label %for.body, label %for.cond.for.cond12.loopexit_crit_edge
54 for.cond.for.cond12.loopexit_crit_edge: ; preds = %for.cond
55 br label %for.cond12.loopexit
57 bb.nph: ; preds = %for.cond.preheader
60 for.body: ; preds = %bb.nph, %for.cond
61 %i.02 = phi i64 [ 2, %bb.nph ], [ %inc, %for.cond ] ; <i64> [#uses=2]
62 %arrayidx10 = getelementptr inbounds [8193 x i8], ptr @main.flags, i64 0, i64 %i.02 ; <ptr> [#uses=1]
63 store i8 1, ptr %arrayidx10
64 %inc = add nsw i64 %i.02, 1 ; <i64> [#uses=2]
67 for.cond12.loopexit: ; preds = %for.cond.for.cond12.loopexit_crit_edge, %for.cond.preheader
68 br i1 true, label %bb.nph16, label %while.cond.loopexit
70 for.cond12: ; preds = %for.inc35
71 %cmp14 = icmp slt i64 %inc37, 8193 ; <i1> [#uses=1]
72 br i1 %cmp14, label %for.body15, label %for.cond12.while.cond.loopexit_crit_edge
74 for.cond12.while.cond.loopexit_crit_edge: ; preds = %for.cond12
75 %count.1.lcssa = phi i32 [ %count.1, %for.cond12 ] ; <i32> [#uses=1]
76 br label %while.cond.loopexit
78 bb.nph16: ; preds = %for.cond12.loopexit
81 for.body15: ; preds = %bb.nph16, %for.cond12
82 %count.212 = phi i32 [ 0, %bb.nph16 ], [ %count.1, %for.cond12 ] ; <i32> [#uses=2]
83 %i.17 = phi i64 [ 2, %bb.nph16 ], [ %inc37, %for.cond12 ] ; <i64> [#uses=4]
84 %arrayidx17 = getelementptr inbounds [8193 x i8], ptr @main.flags, i64 0, i64 %i.17 ; <ptr> [#uses=1]
85 %tmp18 = load i8, ptr %arrayidx17 ; <i8> [#uses=1]
86 %tobool19 = icmp eq i8 %tmp18, 0 ; <i1> [#uses=1]
87 br i1 %tobool19, label %for.inc35, label %if.then
89 if.then: ; preds = %for.body15
90 %add = shl i64 %i.17, 1 ; <i64> [#uses=2]
91 %cmp243 = icmp slt i64 %add, 8193 ; <i1> [#uses=1]
92 br i1 %cmp243, label %bb.nph5, label %for.end32
94 for.cond22: ; preds = %for.body25
95 %cmp24 = icmp slt i64 %add31, 8193 ; <i1> [#uses=1]
96 br i1 %cmp24, label %for.body25, label %for.cond22.for.end32_crit_edge
98 for.cond22.for.end32_crit_edge: ; preds = %for.cond22
101 bb.nph5: ; preds = %if.then
104 for.body25: ; preds = %bb.nph5, %for.cond22
105 %k.04 = phi i64 [ %add, %bb.nph5 ], [ %add31, %for.cond22 ] ; <i64> [#uses=2]
106 %arrayidx27 = getelementptr inbounds [8193 x i8], ptr @main.flags, i64 0, i64 %k.04 ; <ptr> [#uses=1]
107 store i8 0, ptr %arrayidx27
108 %add31 = add nsw i64 %k.04, %i.17 ; <i64> [#uses=2]
111 for.end32: ; preds = %for.cond22.for.end32_crit_edge, %if.then
112 %inc34 = add nsw i32 %count.212, 1 ; <i32> [#uses=1]
115 for.inc35: ; preds = %for.body15, %for.end32
116 %count.1 = phi i32 [ %inc34, %for.end32 ], [ %count.212, %for.body15 ] ; <i32> [#uses=2]
117 %inc37 = add nsw i64 %i.17, 1 ; <i64> [#uses=2]
120 while.end: ; preds = %while.cond.while.end_crit_edge, %while.cond.preheader
121 %count.0.lcssa = phi i32 [ %count.2.lcssa.lcssa, %while.cond.while.end_crit_edge ], [ 0, %while.cond.preheader ] ; <i32> [#uses=1]
122 %call40 = tail call i32 (ptr, ...) @printf(ptr @.str, i32 %count.0.lcssa) nounwind ; <i32> [#uses=0]
126 declare i32 @atoi(ptr nocapture) nounwind readonly
128 declare i32 @printf(ptr nocapture, ...) nounwind
130 ; IndVars doesn't emit a udiv in for.body.preheader since SCEVExpander::expand will
131 ; find out there's already a udiv in the original code.
134 ; CHECK: for.body.preheader:
137 define void @foo(ptr %p, i64 %n) nounwind {
139 %div0 = udiv i64 %n, 7 ; <i64> [#uses=1]
140 %div1 = add i64 %div0, 1
141 %cmp2 = icmp ult i64 0, %div1 ; <i1> [#uses=1]
142 br i1 %cmp2, label %for.body.preheader, label %for.end
144 for.body.preheader: ; preds = %entry
147 for.body: ; preds = %for.body.preheader, %for.body
148 %i.03 = phi i64 [ %inc, %for.body ], [ 0, %for.body.preheader ] ; <i64> [#uses=2]
149 %arrayidx = getelementptr inbounds double, ptr %p, i64 %i.03 ; <ptr> [#uses=1]
150 store double 0.000000e+00, ptr %arrayidx
151 %inc = add i64 %i.03, 1 ; <i64> [#uses=2]
152 %divx = udiv i64 %n, 7 ; <i64> [#uses=1]
153 %div = add i64 %divx, 1
154 %cmp = icmp ult i64 %inc, %div ; <i1> [#uses=1]
155 br i1 %cmp, label %for.body, label %for.end.loopexit
157 for.end.loopexit: ; preds = %for.body
160 for.end: ; preds = %for.end.loopexit, %entry