1 ; RUN: opt -S < %s -simplifycfg -simplifycfg-merge-cond-stores=true -simplifycfg-merge-cond-stores-aggressively=false -phi-node-folding-threshold=2 | FileCheck %s 2 3 target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" 4 target triple = "armv7--linux-gnueabihf" 5 6 ; This is a bit reversal that has been run through the early optimizer (-mem2reg -gvn -instcombine). 7 ; There should be no additional PHIs created at all. The store should be on its own in a predicated 8 ; block and there should be no PHIs. 9 10 ; CHECK-LABEL: @f 11 ; Exactly 15 phis, as there are 15 in the original test case. 12 ; CHECK: select 13 ; CHECK: select 14 ; CHECK: select 15 ; CHECK: select 16 ; CHECK: select 17 ; CHECK: select 18 ; CHECK: select 19 ; CHECK: select 20 ; CHECK: select 21 ; CHECK: select 22 ; CHECK: select 23 ; CHECK: select 24 ; CHECK: select 25 ; CHECK: select 26 ; CHECK: select 27 ; CHECK: select 28 ; CHECK-NOT: select 29 ; CHECK: br i1 {{.*}}, label %[[L:.*]], label %[[R:.*]] 30 ; CHECK: [[L]] ; preds = 31 ; CHECK-NEXT: store 32 ; CHECK-NEXT: br label %[[R]] 33 ; CHECK: [[R]] ; preds = 34 ; CHECK-NEXT: ret i32 0 35 36 define i32 @f(i32* %b) { 37 entry: 38 %0 = load i32, i32* %b, align 4 39 %and = and i32 %0, 1 40 %tobool = icmp eq i32 %and, 0 41 br i1 %tobool, label %if.end, label %if.then 42 43 if.then: ; preds = %entry 44 %or = or i32 %0, -2147483648 45 store i32 %or, i32* %b, align 4 46 br label %if.end 47 48 if.end: ; preds = %entry, %if.then 49 %1 = phi i32 [ %0, %entry ], [ %or, %if.then ] 50 %and1 = and i32 %1, 2 51 %tobool2 = icmp eq i32 %and1, 0 52 br i1 %tobool2, label %if.end5, label %if.then3 53 54 if.then3: ; preds = %if.end 55 %or4 = or i32 %1, 1073741824 56 store i32 %or4, i32* %b, align 4 57 br label %if.end5 58 59 if.end5: ; preds = %if.end, %if.then3 60 %2 = phi i32 [ %1, %if.end ], [ %or4, %if.then3 ] 61 %and6 = and i32 %2, 4 62 %tobool7 = icmp eq i32 %and6, 0 63 br i1 %tobool7, label %if.end10, label %if.then8 64 65 if.then8: ; preds = %if.end5 66 %or9 = or i32 %2, 536870912 67 store i32 %or9, i32* %b, align 4 68 br label %if.end10 69 70 if.end10: ; preds = %if.end5, %if.then8 71 %3 = phi i32 [ %2, %if.end5 ], [ %or9, %if.then8 ] 72 %and11 = and i32 %3, 8 73 %tobool12 = icmp eq i32 %and11, 0 74 br i1 %tobool12, label %if.end15, label %if.then13 75 76 if.then13: ; preds = %if.end10 77 %or14 = or i32 %3, 268435456 78 store i32 %or14, i32* %b, align 4 79 br label %if.end15 80 81 if.end15: ; preds = %if.end10, %if.then13 82 %4 = phi i32 [ %3, %if.end10 ], [ %or14, %if.then13 ] 83 %and16 = and i32 %4, 16 84 %tobool17 = icmp eq i32 %and16, 0 85 br i1 %tobool17, label %if.end20, label %if.then18 86 87 if.then18: ; preds = %if.end15 88 %or19 = or i32 %4, 134217728 89 store i32 %or19, i32* %b, align 4 90 br label %if.end20 91 92 if.end20: ; preds = %if.end15, %if.then18 93 %5 = phi i32 [ %4, %if.end15 ], [ %or19, %if.then18 ] 94 %and21 = and i32 %5, 32 95 %tobool22 = icmp eq i32 %and21, 0 96 br i1 %tobool22, label %if.end25, label %if.then23 97 98 if.then23: ; preds = %if.end20 99 %or24 = or i32 %5, 67108864 100 store i32 %or24, i32* %b, align 4 101 br label %if.end25 102 103 if.end25: ; preds = %if.end20, %if.then23 104 %6 = phi i32 [ %5, %if.end20 ], [ %or24, %if.then23 ] 105 %and26 = and i32 %6, 64 106 %tobool27 = icmp eq i32 %and26, 0 107 br i1 %tobool27, label %if.end30, label %if.then28 108 109 if.then28: ; preds = %if.end25 110 %or29 = or i32 %6, 33554432 111 store i32 %or29, i32* %b, align 4 112 br label %if.end30 113 114 if.end30: ; preds = %if.end25, %if.then28 115 %7 = phi i32 [ %6, %if.end25 ], [ %or29, %if.then28 ] 116 %and31 = and i32 %7, 256 117 %tobool32 = icmp eq i32 %and31, 0 118 br i1 %tobool32, label %if.end35, label %if.then33 119 120 if.then33: ; preds = %if.end30 121 %or34 = or i32 %7, 8388608 122 store i32 %or34, i32* %b, align 4 123 br label %if.end35 124 125 if.end35: ; preds = %if.end30, %if.then33 126 %8 = phi i32 [ %7, %if.end30 ], [ %or34, %if.then33 ] 127 %and36 = and i32 %8, 512 128 %tobool37 = icmp eq i32 %and36, 0 129 br i1 %tobool37, label %if.end40, label %if.then38 130 131 if.then38: ; preds = %if.end35 132 %or39 = or i32 %8, 4194304 133 store i32 %or39, i32* %b, align 4 134 br label %if.end40 135 136 if.end40: ; preds = %if.end35, %if.then38 137 %9 = phi i32 [ %8, %if.end35 ], [ %or39, %if.then38 ] 138 %and41 = and i32 %9, 1024 139 %tobool42 = icmp eq i32 %and41, 0 140 br i1 %tobool42, label %if.end45, label %if.then43 141 142 if.then43: ; preds = %if.end40 143 %or44 = or i32 %9, 2097152 144 store i32 %or44, i32* %b, align 4 145 br label %if.end45 146 147 if.end45: ; preds = %if.end40, %if.then43 148 %10 = phi i32 [ %9, %if.end40 ], [ %or44, %if.then43 ] 149 %and46 = and i32 %10, 2048 150 %tobool47 = icmp eq i32 %and46, 0 151 br i1 %tobool47, label %if.end50, label %if.then48 152 153 if.then48: ; preds = %if.end45 154 %or49 = or i32 %10, 1048576 155 store i32 %or49, i32* %b, align 4 156 br label %if.end50 157 158 if.end50: ; preds = %if.end45, %if.then48 159 %11 = phi i32 [ %10, %if.end45 ], [ %or49, %if.then48 ] 160 %and51 = and i32 %11, 4096 161 %tobool52 = icmp eq i32 %and51, 0 162 br i1 %tobool52, label %if.end55, label %if.then53 163 164 if.then53: ; preds = %if.end50 165 %or54 = or i32 %11, 524288 166 store i32 %or54, i32* %b, align 4 167 br label %if.end55 168 169 if.end55: ; preds = %if.end50, %if.then53 170 %12 = phi i32 [ %11, %if.end50 ], [ %or54, %if.then53 ] 171 %and56 = and i32 %12, 8192 172 %tobool57 = icmp eq i32 %and56, 0 173 br i1 %tobool57, label %if.end60, label %if.then58 174 175 if.then58: ; preds = %if.end55 176 %or59 = or i32 %12, 262144 177 store i32 %or59, i32* %b, align 4 178 br label %if.end60 179 180 if.end60: ; preds = %if.end55, %if.then58 181 %13 = phi i32 [ %12, %if.end55 ], [ %or59, %if.then58 ] 182 %and61 = and i32 %13, 16384 183 %tobool62 = icmp eq i32 %and61, 0 184 br i1 %tobool62, label %if.end65, label %if.then63 185 186 if.then63: ; preds = %if.end60 187 %or64 = or i32 %13, 131072 188 store i32 %or64, i32* %b, align 4 189 br label %if.end65 190 191 if.end65: ; preds = %if.end60, %if.then63 192 %14 = phi i32 [ %13, %if.end60 ], [ %or64, %if.then63 ] 193 %and66 = and i32 %14, 32768 194 %tobool67 = icmp eq i32 %and66, 0 195 br i1 %tobool67, label %if.end70, label %if.then68 196 197 if.then68: ; preds = %if.end65 198 %or69 = or i32 %14, 65536 199 store i32 %or69, i32* %b, align 4 200 br label %if.end70 201 202 if.end70: ; preds = %if.end65, %if.then68 203 %15 = phi i32 [ %14, %if.end65 ], [ %or69, %if.then68 ] 204 %and71 = and i32 %15, 128 205 %tobool72 = icmp eq i32 %and71, 0 206 br i1 %tobool72, label %if.end75, label %if.then73 207 208 if.then73: ; preds = %if.end70 209 %or74 = or i32 %15, 16777216 210 store i32 %or74, i32* %b, align 4 211 br label %if.end75 212 213 if.end75: ; preds = %if.end70, %if.then73 214 ret i32 0 215 } 216
