unroll-cleanup.ll
3.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
; PR23524
; The test is to check redundency produced by loop unroll pass
; should be cleaned up by later pass.
; RUN: opt < %s -O2 -S | FileCheck %s
; After loop unroll:
; %dec18 = add nsw i32 %dec18.in, -1
; ...
; %dec18.1 = add nsw i32 %dec18, -1
; should be merged to:
; %dec18.1 = add nsw i32 %dec18.in, -2
;
; CHECK-LABEL: @_Z3fn1v(
; CHECK: %dec18.1 = add nsw i32 %dec18.in, -2
; ModuleID = '<stdin>'
target triple = "x86_64-unknown-linux-gnu"
@b = global i32 0, align 4
@c = global i32 0, align 4
; Function Attrs: nounwind uwtable
define void @_Z3fn1v() #0 {
entry:
%tmp = load i32, i32* @b, align 4
%tobool20 = icmp eq i32 %tmp, 0
br i1 %tobool20, label %for.end6, label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
br label %for.body
for.cond1.for.cond.loopexit_crit_edge: ; preds = %for.inc
%add.ptr.lcssa = phi i16* [ %add.ptr, %for.inc ]
%incdec.ptr.lcssa = phi i8* [ %incdec.ptr, %for.inc ]
br label %for.cond.loopexit
for.cond.loopexit: ; preds = %for.body, %for.cond1.for.cond.loopexit_crit_edge
%r.1.lcssa = phi i16* [ %add.ptr.lcssa, %for.cond1.for.cond.loopexit_crit_edge ], [ %r.022, %for.body ]
%a.1.lcssa = phi i8* [ %incdec.ptr.lcssa, %for.cond1.for.cond.loopexit_crit_edge ], [ %a.021, %for.body ]
%tmp1 = load i32, i32* @b, align 4
%tobool = icmp eq i32 %tmp1, 0
br i1 %tobool, label %for.cond.for.end6_crit_edge, label %for.body
for.body: ; preds = %for.cond.loopexit, %for.body.lr.ph
%r.022 = phi i16* [ undef, %for.body.lr.ph ], [ %r.1.lcssa, %for.cond.loopexit ]
%a.021 = phi i8* [ undef, %for.body.lr.ph ], [ %a.1.lcssa, %for.cond.loopexit ]
%tmp2 = load i32, i32* @c, align 4
%tobool215 = icmp eq i32 %tmp2, 0
br i1 %tobool215, label %for.cond.loopexit, label %for.body3.lr.ph
for.body3.lr.ph: ; preds = %for.body
br label %for.body3
for.body3: ; preds = %for.inc, %for.body3.lr.ph
%dec18.in = phi i32 [ %tmp2, %for.body3.lr.ph ], [ %dec18, %for.inc ]
%r.117 = phi i16* [ %r.022, %for.body3.lr.ph ], [ %add.ptr, %for.inc ]
%a.116 = phi i8* [ %a.021, %for.body3.lr.ph ], [ %incdec.ptr, %for.inc ]
%dec18 = add nsw i32 %dec18.in, -1
%tmp3 = load i8, i8* %a.116, align 1
%cmp = icmp eq i8 %tmp3, 0
br i1 %cmp, label %if.then, label %for.inc
if.then: ; preds = %for.body3
%arrayidx = getelementptr inbounds i16, i16* %r.117, i64 1
store i16 0, i16* %arrayidx, align 2
store i16 0, i16* %r.117, align 2
%arrayidx5 = getelementptr inbounds i16, i16* %r.117, i64 2
store i16 0, i16* %arrayidx5, align 2
br label %for.inc
for.inc: ; preds = %if.then, %for.body3
%incdec.ptr = getelementptr inbounds i8, i8* %a.116, i64 1
%add.ptr = getelementptr inbounds i16, i16* %r.117, i64 3
%tobool2 = icmp eq i32 %dec18, 0
br i1 %tobool2, label %for.cond1.for.cond.loopexit_crit_edge, label %for.body3, !llvm.loop !0
for.cond.for.end6_crit_edge: ; preds = %for.cond.loopexit
br label %for.end6
for.end6: ; preds = %for.cond.for.end6_crit_edge, %entry
ret void
}
!0 = !{!0, !1}
!1 = !{!"llvm.loop.unroll.count", i32 2}