1; RUN: llc -march=x86-64 < %s -block-placement-exit-block-bias=20 | 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 28; CHECK: jmp 29define i32 @longest_match(%struct.internal_state* nocapture %s, i32 %cur_match) nounwind { 30entry: 31 %max_chain_length = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 31 32 %0 = load i32* %max_chain_length, align 4 33 %window = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 14 34 %1 = load i8** %window, align 8 35 %strstart = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 27 36 %2 = load i32* %strstart, align 4 37 %idx.ext = zext i32 %2 to i64 38 %add.ptr = getelementptr inbounds i8* %1, i64 %idx.ext 39 %prev_length = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 30 40 %3 = load i32* %prev_length, align 4 41 %nice_match1 = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 36 42 %4 = load i32* %nice_match1, align 4 43 %w_size = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 11 44 %5 = load i32* %w_size, align 4 45 %sub = add i32 %5, -262 46 %cmp = icmp ugt i32 %2, %sub 47 %sub6 = sub i32 %2, %sub 48 %sub6. = select i1 %cmp, i32 %sub6, i32 0 49 %prev7 = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 16 50 %6 = load i16** %prev7, align 8 51 %w_mask = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 13 52 %7 = load i32* %w_mask, align 4 53 %add.ptr11.sum = add i64 %idx.ext, 258 54 %add.ptr12 = getelementptr inbounds i8* %1, i64 %add.ptr11.sum 55 %sub13 = add nsw i32 %3, -1 56 %idxprom = sext i32 %sub13 to i64 57 %add.ptr.sum = add i64 %idxprom, %idx.ext 58 %arrayidx = getelementptr inbounds i8* %1, i64 %add.ptr.sum 59 %8 = load i8* %arrayidx, align 1 60 %idxprom14 = sext i32 %3 to i64 61 %add.ptr.sum213 = add i64 %idxprom14, %idx.ext 62 %arrayidx15 = getelementptr inbounds i8* %1, i64 %add.ptr.sum213 63 %9 = load i8* %arrayidx15, align 1 64 %good_match = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 35 65 %10 = load i32* %good_match, align 4 66 %cmp17 = icmp ult i32 %3, %10 67 %shr = lshr i32 %0, 2 68 %chain_length.0 = select i1 %cmp17, i32 %0, i32 %shr 69 %lookahead = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 29 70 %11 = load i32* %lookahead, align 4 71 %cmp18 = icmp ugt i32 %4, %11 72 %. = select i1 %cmp18, i32 %11, i32 %4 73 %match_start = getelementptr inbounds %struct.internal_state* %s, i64 0, i32 28 74 %add.ptr.sum217 = add i64 %idx.ext, 1 75 %arrayidx44 = getelementptr inbounds i8* %1, i64 %add.ptr.sum217 76 %add.ptr.sum218 = add i64 %idx.ext, 2 77 %add.ptr50 = getelementptr inbounds i8* %1, i64 %add.ptr.sum218 78 %sub.ptr.lhs.cast = ptrtoint i8* %add.ptr12 to i64 79 br label %do.body 80 81do.body: ; preds = %land.rhs131, %entry 82 %best_len.0 = phi i32 [ %best_len.1, %land.rhs131 ], [ %3, %entry ] 83 %chain_length.1 = phi i32 [ %dec, %land.rhs131 ], [ %chain_length.0, %entry ] 84 %cur_match.addr.0 = phi i32 [ %conv128, %land.rhs131 ], [ %cur_match, %entry ] 85 %scan_end1.0 = phi i8 [ %scan_end1.1, %land.rhs131 ], [ %8, %entry ] 86 %scan_end.0 = phi i8 [ %scan_end.1, %land.rhs131 ], [ %9, %entry ] 87 %idx.ext23 = zext i32 %cur_match.addr.0 to i64 88 %add.ptr24 = getelementptr inbounds i8* %1, i64 %idx.ext23 89 %idxprom25 = sext i32 %best_len.0 to i64 90 %add.ptr24.sum = add i64 %idx.ext23, %idxprom25 91 %arrayidx26 = getelementptr inbounds i8* %1, i64 %add.ptr24.sum 92 %12 = load i8* %arrayidx26, align 1 93 %cmp28 = icmp eq i8 %12, %scan_end.0 94 br i1 %cmp28, label %lor.lhs.false, label %do.cond125 95 96lor.lhs.false: ; preds = %do.body 97 %sub30 = add nsw i32 %best_len.0, -1 98 %idxprom31 = sext i32 %sub30 to i64 99 %add.ptr24.sum214 = add i64 %idx.ext23, %idxprom31 100 %arrayidx32 = getelementptr inbounds i8* %1, i64 %add.ptr24.sum214 101 %13 = load i8* %arrayidx32, align 1 102 %cmp35 = icmp eq i8 %13, %scan_end1.0 103 br i1 %cmp35, label %lor.lhs.false37, label %do.cond125 104 105lor.lhs.false37: ; preds = %lor.lhs.false 106 %14 = load i8* %add.ptr24, align 1 107 %15 = load i8* %add.ptr, align 1 108 %cmp40 = icmp eq i8 %14, %15 109 br i1 %cmp40, label %lor.lhs.false42, label %do.cond125 110 111lor.lhs.false42: ; preds = %lor.lhs.false37 112 %add.ptr24.sum215 = add i64 %idx.ext23, 1 113 %incdec.ptr = getelementptr inbounds i8* %1, i64 %add.ptr24.sum215 114 %16 = load i8* %incdec.ptr, align 1 115 %17 = load i8* %arrayidx44, align 1 116 %cmp46 = icmp eq i8 %16, %17 117 br i1 %cmp46, label %if.end49, label %do.cond125 118 119if.end49: ; preds = %lor.lhs.false42 120 %incdec.ptr.sum = add i64 %idx.ext23, 2 121 %incdec.ptr51 = getelementptr inbounds i8* %1, i64 %incdec.ptr.sum 122 br label %do.cond 123 124do.cond: ; preds = %land.lhs.true100, %if.end49 125 %match.0 = phi i8* [ %incdec.ptr51, %if.end49 ], [ %incdec.ptr103, %land.lhs.true100 ] 126 %scan.1 = phi i8* [ %add.ptr50, %if.end49 ], [ %incdec.ptr101, %land.lhs.true100 ] 127 %incdec.ptr53 = getelementptr inbounds i8* %scan.1, i64 1 128 %18 = load i8* %incdec.ptr53, align 1 129 %incdec.ptr55 = getelementptr inbounds i8* %match.0, i64 1 130 %19 = load i8* %incdec.ptr55, align 1 131 %cmp57 = icmp eq i8 %18, %19 132 br i1 %cmp57, label %land.lhs.true, label %do.end 133 134land.lhs.true: ; preds = %do.cond 135 %incdec.ptr59 = getelementptr inbounds i8* %scan.1, i64 2 136 %20 = load i8* %incdec.ptr59, align 1 137 %incdec.ptr61 = getelementptr inbounds i8* %match.0, i64 2 138 %21 = load i8* %incdec.ptr61, align 1 139 %cmp63 = icmp eq i8 %20, %21 140 br i1 %cmp63, label %land.lhs.true65, label %do.end 141 142land.lhs.true65: ; preds = %land.lhs.true 143 %incdec.ptr66 = getelementptr inbounds i8* %scan.1, i64 3 144 %22 = load i8* %incdec.ptr66, align 1 145 %incdec.ptr68 = getelementptr inbounds i8* %match.0, i64 3 146 %23 = load i8* %incdec.ptr68, align 1 147 %cmp70 = icmp eq i8 %22, %23 148 br i1 %cmp70, label %land.lhs.true72, label %do.end 149 150land.lhs.true72: ; preds = %land.lhs.true65 151 %incdec.ptr73 = getelementptr inbounds i8* %scan.1, i64 4 152 %24 = load i8* %incdec.ptr73, align 1 153 %incdec.ptr75 = getelementptr inbounds i8* %match.0, i64 4 154 %25 = load i8* %incdec.ptr75, align 1 155 %cmp77 = icmp eq i8 %24, %25 156 br i1 %cmp77, label %land.lhs.true79, label %do.end 157 158land.lhs.true79: ; preds = %land.lhs.true72 159 %incdec.ptr80 = getelementptr inbounds i8* %scan.1, i64 5 160 %26 = load i8* %incdec.ptr80, align 1 161 %incdec.ptr82 = getelementptr inbounds i8* %match.0, i64 5 162 %27 = load i8* %incdec.ptr82, align 1 163 %cmp84 = icmp eq i8 %26, %27 164 br i1 %cmp84, label %land.lhs.true86, label %do.end 165 166land.lhs.true86: ; preds = %land.lhs.true79 167 %incdec.ptr87 = getelementptr inbounds i8* %scan.1, i64 6 168 %28 = load i8* %incdec.ptr87, align 1 169 %incdec.ptr89 = getelementptr inbounds i8* %match.0, i64 6 170 %29 = load i8* %incdec.ptr89, align 1 171 %cmp91 = icmp eq i8 %28, %29 172 br i1 %cmp91, label %land.lhs.true93, label %do.end 173 174land.lhs.true93: ; preds = %land.lhs.true86 175 %incdec.ptr94 = getelementptr inbounds i8* %scan.1, i64 7 176 %30 = load i8* %incdec.ptr94, align 1 177 %incdec.ptr96 = getelementptr inbounds i8* %match.0, i64 7 178 %31 = load i8* %incdec.ptr96, align 1 179 %cmp98 = icmp eq i8 %30, %31 180 br i1 %cmp98, label %land.lhs.true100, label %do.end 181 182land.lhs.true100: ; preds = %land.lhs.true93 183 %incdec.ptr101 = getelementptr inbounds i8* %scan.1, i64 8 184 %32 = load i8* %incdec.ptr101, align 1 185 %incdec.ptr103 = getelementptr inbounds i8* %match.0, i64 8 186 %33 = load i8* %incdec.ptr103, align 1 187 %cmp105 = icmp eq i8 %32, %33 188 %cmp107 = icmp ult i8* %incdec.ptr101, %add.ptr12 189 %or.cond = and i1 %cmp105, %cmp107 190 br i1 %or.cond, label %do.cond, label %do.end 191 192do.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 193 %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 ] 194 %sub.ptr.rhs.cast = ptrtoint i8* %scan.2 to i64 195 %sub.ptr.sub = sub i64 %sub.ptr.lhs.cast, %sub.ptr.rhs.cast 196 %conv109 = trunc i64 %sub.ptr.sub to i32 197 %sub110 = sub nsw i32 258, %conv109 198 %cmp112 = icmp sgt i32 %sub110, %best_len.0 199 br i1 %cmp112, label %if.then114, label %do.cond125 200 201if.then114: ; preds = %do.end 202 store i32 %cur_match.addr.0, i32* %match_start, align 4 203 %cmp115 = icmp slt i32 %sub110, %. 204 br i1 %cmp115, label %if.end118, label %do.end135 205 206if.end118: ; preds = %if.then114 207 %sub119 = add nsw i32 %sub110, -1 208 %idxprom120 = sext i32 %sub119 to i64 209 %add.ptr111.sum = add i64 %idxprom120, %idx.ext 210 %arrayidx121 = getelementptr inbounds i8* %1, i64 %add.ptr111.sum 211 %34 = load i8* %arrayidx121, align 1 212 %idxprom122 = sext i32 %sub110 to i64 213 %add.ptr111.sum216 = add i64 %idxprom122, %idx.ext 214 %arrayidx123 = getelementptr inbounds i8* %1, i64 %add.ptr111.sum216 215 %35 = load i8* %arrayidx123, align 1 216 br label %do.cond125 217 218do.cond125: ; preds = %if.end118, %do.end, %lor.lhs.false42, %lor.lhs.false37, %lor.lhs.false, %do.body 219 %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 ] 220 %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 ] 221 %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 ] 222 %and = and i32 %cur_match.addr.0, %7 223 %idxprom126 = zext i32 %and to i64 224 %arrayidx127 = getelementptr inbounds i16* %6, i64 %idxprom126 225 %36 = load i16* %arrayidx127, align 2 226 %conv128 = zext i16 %36 to i32 227 %cmp129 = icmp ugt i32 %conv128, %sub6. 228 br i1 %cmp129, label %land.rhs131, label %do.end135 229 230land.rhs131: ; preds = %do.cond125 231 %dec = add i32 %chain_length.1, -1 232 %cmp132 = icmp eq i32 %dec, 0 233 br i1 %cmp132, label %do.end135, label %do.body 234 235do.end135: ; preds = %land.rhs131, %do.cond125, %if.then114 236 %best_len.2 = phi i32 [ %best_len.1, %land.rhs131 ], [ %best_len.1, %do.cond125 ], [ %sub110, %if.then114 ] 237 %cmp137 = icmp ugt i32 %best_len.2, %11 238 %.best_len.2 = select i1 %cmp137, i32 %11, i32 %best_len.2 239 ret i32 %.best_len.2 240} 241