1; RUN: llc < %s -block-placement-exit-block-bias=20 -no-phi-elim-live-out-early-exit | FileCheck %s
2target 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"
3target triple = "x86_64-apple-macosx10.9.0"
4
5; This is longest_match, the hot function from zlib's deflate implementation.
6
7%struct.internal_state = type { %struct.z_stream_s*, i32, i8*, i64, i8*, i32, i32, %struct.gz_header_s*, i32, i8, i32, i32, i32, i32, i8*, i64, i16*, i16*, i32, i32, i32, i32, i32, i64, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, [573 x %struct.ct_data_s], [61 x %struct.ct_data_s], [39 x %struct.ct_data_s], %struct.tree_desc_s, %struct.tree_desc_s, %struct.tree_desc_s, [16 x i16], [573 x i32], i32, i32, [573 x i8], i8*, i32, i32, i16*, i64, i64, i32, i32, i16, i32, i64 }
8%struct.z_stream_s = type { i8*, i32, i64, i8*, i32, i64, i8*, %struct.internal_state*, i8* (i8*, i32, i32)*, void (i8*, i8*)*, i8*, i32, i64, i64 }
9%struct.gz_header_s = type { i32, i64, i32, i32, i8*, i32, i32, i8*, i32, i8*, i32, i32, i32 }
10%struct.ct_data_s = type { %union.anon, %union.anon.0 }
11%union.anon = type { i16 }
12%union.anon.0 = type { i16 }
13%struct.tree_desc_s = type { %struct.ct_data_s*, i32, %struct.static_tree_desc_s* }
14%struct.static_tree_desc_s = type { i32 }
15
16; CHECK-LABEL: longest_match:
17
18; Verify that there are no spills or reloads in the loop exit block. This loop
19; is mostly cold, only %do.cond125 and %land.rhs131 are hot.
20; CHECK: %do.cond125
21; CHECK-NOT: {{Spill|Reload}}
22; CHECK: jbe
23
24; Verify that block placement doesn't destroy source order. It's important that
25; the two hot blocks are laid out close to each other.
26; CHECK-NEXT: %land.rhs131
27; CHECK: jne
28define i32 @longest_match(%struct.internal_state* nocapture %s, i32 %cur_match) nounwind {
29entry:
30  %max_chain_length = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 31
31  %0 = load i32, i32* %max_chain_length, align 4
32  %window = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 14
33  %1 = load i8*, i8** %window, align 8
34  %strstart = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 27
35  %2 = load i32, i32* %strstart, align 4
36  %idx.ext = zext i32 %2 to i64
37  %add.ptr = getelementptr inbounds i8, i8* %1, i64 %idx.ext
38  %prev_length = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 30
39  %3 = load i32, i32* %prev_length, align 4
40  %nice_match1 = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 36
41  %4 = load i32, i32* %nice_match1, align 4
42  %w_size = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 11
43  %5 = load i32, i32* %w_size, align 4
44  %sub = add i32 %5, -262
45  %cmp = icmp ugt i32 %2, %sub
46  %sub6 = sub i32 %2, %sub
47  %sub6. = select i1 %cmp, i32 %sub6, i32 0
48  %prev7 = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 16
49  %6 = load i16*, i16** %prev7, align 8
50  %w_mask = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 13
51  %7 = load i32, i32* %w_mask, align 4
52  %add.ptr11.sum = add i64 %idx.ext, 258
53  %add.ptr12 = getelementptr inbounds i8, i8* %1, i64 %add.ptr11.sum
54  %sub13 = add nsw i32 %3, -1
55  %idxprom = sext i32 %sub13 to i64
56  %add.ptr.sum = add i64 %idxprom, %idx.ext
57  %arrayidx = getelementptr inbounds i8, i8* %1, i64 %add.ptr.sum
58  %8 = load i8, i8* %arrayidx, align 1
59  %idxprom14 = sext i32 %3 to i64
60  %add.ptr.sum213 = add i64 %idxprom14, %idx.ext
61  %arrayidx15 = getelementptr inbounds i8, i8* %1, i64 %add.ptr.sum213
62  %9 = load i8, i8* %arrayidx15, align 1
63  %good_match = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 35
64  %10 = load i32, i32* %good_match, align 4
65  %cmp17 = icmp ult i32 %3, %10
66  %shr = lshr i32 %0, 2
67  %chain_length.0 = select i1 %cmp17, i32 %0, i32 %shr
68  %lookahead = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 29
69  %11 = load i32, i32* %lookahead, align 4
70  %cmp18 = icmp ugt i32 %4, %11
71  %. = select i1 %cmp18, i32 %11, i32 %4
72  %match_start = getelementptr inbounds %struct.internal_state, %struct.internal_state* %s, i64 0, i32 28
73  %add.ptr.sum217 = add i64 %idx.ext, 1
74  %arrayidx44 = getelementptr inbounds i8, i8* %1, i64 %add.ptr.sum217
75  %add.ptr.sum218 = add i64 %idx.ext, 2
76  %add.ptr50 = getelementptr inbounds i8, i8* %1, i64 %add.ptr.sum218
77  %sub.ptr.lhs.cast = ptrtoint i8* %add.ptr12 to i64
78  br label %do.body
79
80do.body:                                          ; preds = %land.rhs131, %entry
81  %best_len.0 = phi i32 [ %best_len.1, %land.rhs131 ], [ %3, %entry ]
82  %chain_length.1 = phi i32 [ %dec, %land.rhs131 ], [ %chain_length.0, %entry ]
83  %cur_match.addr.0 = phi i32 [ %conv128, %land.rhs131 ], [ %cur_match, %entry ]
84  %scan_end1.0 = phi i8 [ %scan_end1.1, %land.rhs131 ], [ %8, %entry ]
85  %scan_end.0 = phi i8 [ %scan_end.1, %land.rhs131 ], [ %9, %entry ]
86  %idx.ext23 = zext i32 %cur_match.addr.0 to i64
87  %add.ptr24 = getelementptr inbounds i8, i8* %1, i64 %idx.ext23
88  %idxprom25 = sext i32 %best_len.0 to i64
89  %add.ptr24.sum = add i64 %idx.ext23, %idxprom25
90  %arrayidx26 = getelementptr inbounds i8, i8* %1, i64 %add.ptr24.sum
91  %12 = load i8, i8* %arrayidx26, align 1
92  %cmp28 = icmp eq i8 %12, %scan_end.0
93  br i1 %cmp28, label %lor.lhs.false, label %do.cond125
94
95lor.lhs.false:                                    ; preds = %do.body
96  %sub30 = add nsw i32 %best_len.0, -1
97  %idxprom31 = sext i32 %sub30 to i64
98  %add.ptr24.sum214 = add i64 %idx.ext23, %idxprom31
99  %arrayidx32 = getelementptr inbounds i8, i8* %1, i64 %add.ptr24.sum214
100  %13 = load i8, i8* %arrayidx32, align 1
101  %cmp35 = icmp eq i8 %13, %scan_end1.0
102  br i1 %cmp35, label %lor.lhs.false37, label %do.cond125
103
104lor.lhs.false37:                                  ; preds = %lor.lhs.false
105  %14 = load i8, i8* %add.ptr24, align 1
106  %15 = load i8, i8* %add.ptr, align 1
107  %cmp40 = icmp eq i8 %14, %15
108  br i1 %cmp40, label %lor.lhs.false42, label %do.cond125
109
110lor.lhs.false42:                                  ; preds = %lor.lhs.false37
111  %add.ptr24.sum215 = add i64 %idx.ext23, 1
112  %incdec.ptr = getelementptr inbounds i8, i8* %1, i64 %add.ptr24.sum215
113  %16 = load i8, i8* %incdec.ptr, align 1
114  %17 = load i8, i8* %arrayidx44, align 1
115  %cmp46 = icmp eq i8 %16, %17
116  br i1 %cmp46, label %if.end49, label %do.cond125
117
118if.end49:                                         ; preds = %lor.lhs.false42
119  %incdec.ptr.sum = add i64 %idx.ext23, 2
120  %incdec.ptr51 = getelementptr inbounds i8, i8* %1, i64 %incdec.ptr.sum
121  br label %do.cond
122
123do.cond:                                          ; preds = %land.lhs.true100, %if.end49
124  %match.0 = phi i8* [ %incdec.ptr51, %if.end49 ], [ %incdec.ptr103, %land.lhs.true100 ]
125  %scan.1 = phi i8* [ %add.ptr50, %if.end49 ], [ %incdec.ptr101, %land.lhs.true100 ]
126  %incdec.ptr53 = getelementptr inbounds i8, i8* %scan.1, i64 1
127  %18 = load i8, i8* %incdec.ptr53, align 1
128  %incdec.ptr55 = getelementptr inbounds i8, i8* %match.0, i64 1
129  %19 = load i8, i8* %incdec.ptr55, align 1
130  %cmp57 = icmp eq i8 %18, %19
131  br i1 %cmp57, label %land.lhs.true, label %do.end
132
133land.lhs.true:                                    ; preds = %do.cond
134  %incdec.ptr59 = getelementptr inbounds i8, i8* %scan.1, i64 2
135  %20 = load i8, i8* %incdec.ptr59, align 1
136  %incdec.ptr61 = getelementptr inbounds i8, i8* %match.0, i64 2
137  %21 = load i8, i8* %incdec.ptr61, align 1
138  %cmp63 = icmp eq i8 %20, %21
139  br i1 %cmp63, label %land.lhs.true65, label %do.end
140
141land.lhs.true65:                                  ; preds = %land.lhs.true
142  %incdec.ptr66 = getelementptr inbounds i8, i8* %scan.1, i64 3
143  %22 = load i8, i8* %incdec.ptr66, align 1
144  %incdec.ptr68 = getelementptr inbounds i8, i8* %match.0, i64 3
145  %23 = load i8, i8* %incdec.ptr68, align 1
146  %cmp70 = icmp eq i8 %22, %23
147  br i1 %cmp70, label %land.lhs.true72, label %do.end
148
149land.lhs.true72:                                  ; preds = %land.lhs.true65
150  %incdec.ptr73 = getelementptr inbounds i8, i8* %scan.1, i64 4
151  %24 = load i8, i8* %incdec.ptr73, align 1
152  %incdec.ptr75 = getelementptr inbounds i8, i8* %match.0, i64 4
153  %25 = load i8, i8* %incdec.ptr75, align 1
154  %cmp77 = icmp eq i8 %24, %25
155  br i1 %cmp77, label %land.lhs.true79, label %do.end
156
157land.lhs.true79:                                  ; preds = %land.lhs.true72
158  %incdec.ptr80 = getelementptr inbounds i8, i8* %scan.1, i64 5
159  %26 = load i8, i8* %incdec.ptr80, align 1
160  %incdec.ptr82 = getelementptr inbounds i8, i8* %match.0, i64 5
161  %27 = load i8, i8* %incdec.ptr82, align 1
162  %cmp84 = icmp eq i8 %26, %27
163  br i1 %cmp84, label %land.lhs.true86, label %do.end
164
165land.lhs.true86:                                  ; preds = %land.lhs.true79
166  %incdec.ptr87 = getelementptr inbounds i8, i8* %scan.1, i64 6
167  %28 = load i8, i8* %incdec.ptr87, align 1
168  %incdec.ptr89 = getelementptr inbounds i8, i8* %match.0, i64 6
169  %29 = load i8, i8* %incdec.ptr89, align 1
170  %cmp91 = icmp eq i8 %28, %29
171  br i1 %cmp91, label %land.lhs.true93, label %do.end
172
173land.lhs.true93:                                  ; preds = %land.lhs.true86
174  %incdec.ptr94 = getelementptr inbounds i8, i8* %scan.1, i64 7
175  %30 = load i8, i8* %incdec.ptr94, align 1
176  %incdec.ptr96 = getelementptr inbounds i8, i8* %match.0, i64 7
177  %31 = load i8, i8* %incdec.ptr96, align 1
178  %cmp98 = icmp eq i8 %30, %31
179  br i1 %cmp98, label %land.lhs.true100, label %do.end
180
181land.lhs.true100:                                 ; preds = %land.lhs.true93
182  %incdec.ptr101 = getelementptr inbounds i8, i8* %scan.1, i64 8
183  %32 = load i8, i8* %incdec.ptr101, align 1
184  %incdec.ptr103 = getelementptr inbounds i8, i8* %match.0, i64 8
185  %33 = load i8, i8* %incdec.ptr103, align 1
186  %cmp105 = icmp eq i8 %32, %33
187  %cmp107 = icmp ult i8* %incdec.ptr101, %add.ptr12
188  %or.cond = and i1 %cmp105, %cmp107
189  br i1 %or.cond, label %do.cond, label %do.end
190
191do.end:                                           ; preds = %land.lhs.true100, %land.lhs.true93, %land.lhs.true86, %land.lhs.true79, %land.lhs.true72, %land.lhs.true65, %land.lhs.true, %do.cond
192  %scan.2 = phi i8* [ %incdec.ptr101, %land.lhs.true100 ], [ %incdec.ptr94, %land.lhs.true93 ], [ %incdec.ptr87, %land.lhs.true86 ], [ %incdec.ptr80, %land.lhs.true79 ], [ %incdec.ptr73, %land.lhs.true72 ], [ %incdec.ptr66, %land.lhs.true65 ], [ %incdec.ptr59, %land.lhs.true ], [ %incdec.ptr53, %do.cond ]
193  %sub.ptr.rhs.cast = ptrtoint i8* %scan.2 to i64
194  %sub.ptr.sub = sub i64 %sub.ptr.lhs.cast, %sub.ptr.rhs.cast
195  %conv109 = trunc i64 %sub.ptr.sub to i32
196  %sub110 = sub nsw i32 258, %conv109
197  %cmp112 = icmp sgt i32 %sub110, %best_len.0
198  br i1 %cmp112, label %if.then114, label %do.cond125
199
200if.then114:                                       ; preds = %do.end
201  store i32 %cur_match.addr.0, i32* %match_start, align 4
202  %cmp115 = icmp slt i32 %sub110, %.
203  br i1 %cmp115, label %if.end118, label %do.end135
204
205if.end118:                                        ; preds = %if.then114
206  %sub119 = add nsw i32 %sub110, -1
207  %idxprom120 = sext i32 %sub119 to i64
208  %add.ptr111.sum = add i64 %idxprom120, %idx.ext
209  %arrayidx121 = getelementptr inbounds i8, i8* %1, i64 %add.ptr111.sum
210  %34 = load i8, i8* %arrayidx121, align 1
211  %idxprom122 = sext i32 %sub110 to i64
212  %add.ptr111.sum216 = add i64 %idxprom122, %idx.ext
213  %arrayidx123 = getelementptr inbounds i8, i8* %1, i64 %add.ptr111.sum216
214  %35 = load i8, i8* %arrayidx123, align 1
215  br label %do.cond125
216
217do.cond125:                                       ; preds = %if.end118, %do.end, %lor.lhs.false42, %lor.lhs.false37, %lor.lhs.false, %do.body
218  %best_len.1 = phi i32 [ %best_len.0, %do.body ], [ %best_len.0, %lor.lhs.false ], [ %best_len.0, %lor.lhs.false37 ], [ %best_len.0, %lor.lhs.false42 ], [ %sub110, %if.end118 ], [ %best_len.0, %do.end ]
219  %scan_end1.1 = phi i8 [ %scan_end1.0, %do.body ], [ %scan_end1.0, %lor.lhs.false ], [ %scan_end1.0, %lor.lhs.false37 ], [ %scan_end1.0, %lor.lhs.false42 ], [ %34, %if.end118 ], [ %scan_end1.0, %do.end ]
220  %scan_end.1 = phi i8 [ %scan_end.0, %do.body ], [ %scan_end.0, %lor.lhs.false ], [ %scan_end.0, %lor.lhs.false37 ], [ %scan_end.0, %lor.lhs.false42 ], [ %35, %if.end118 ], [ %scan_end.0, %do.end ]
221  %and = and i32 %cur_match.addr.0, %7
222  %idxprom126 = zext i32 %and to i64
223  %arrayidx127 = getelementptr inbounds i16, i16* %6, i64 %idxprom126
224  %36 = load i16, i16* %arrayidx127, align 2
225  %conv128 = zext i16 %36 to i32
226  %cmp129 = icmp ugt i32 %conv128, %sub6.
227  br i1 %cmp129, label %land.rhs131, label %do.end135
228
229land.rhs131:                                      ; preds = %do.cond125
230  %dec = add i32 %chain_length.1, -1
231  %cmp132 = icmp eq i32 %dec, 0
232  br i1 %cmp132, label %do.end135, label %do.body
233
234do.end135:                                        ; preds = %land.rhs131, %do.cond125, %if.then114
235  %best_len.2 = phi i32 [ %best_len.1, %land.rhs131 ], [ %best_len.1, %do.cond125 ], [ %sub110, %if.then114 ]
236  %cmp137 = icmp ugt i32 %best_len.2, %11
237  %.best_len.2 = select i1 %cmp137, i32 %11, i32 %best_len.2
238  ret i32 %.best_len.2
239}
240