1; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce -instcombine -S | FileCheck %s 2 3target 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" 4target triple = "x86_64-apple-macosx10.8.0" 5 6;CHECK-LABEL: @reduction_sum( 7;CHECK: phi <4 x i32> 8;CHECK: load <4 x i32> 9;CHECK: add <4 x i32> 10;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef> 11;CHECK: add <4 x i32> 12;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> 13;CHECK: add <4 x i32> 14;CHECK: extractelement <4 x i32> %{{.*}}, i32 0 15;CHECK: ret i32 16define i32 @reduction_sum(i32 %n, i32* noalias nocapture %A, i32* noalias nocapture %B) nounwind uwtable readonly noinline ssp { 17 %1 = icmp sgt i32 %n, 0 18 br i1 %1, label %.lr.ph, label %._crit_edge 19 20.lr.ph: ; preds = %0, %.lr.ph 21 %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ] 22 %sum.02 = phi i32 [ %9, %.lr.ph ], [ 0, %0 ] 23 %2 = getelementptr inbounds i32* %A, i64 %indvars.iv 24 %3 = load i32* %2, align 4 25 %4 = getelementptr inbounds i32* %B, i64 %indvars.iv 26 %5 = load i32* %4, align 4 27 %6 = trunc i64 %indvars.iv to i32 28 %7 = add i32 %sum.02, %6 29 %8 = add i32 %7, %3 30 %9 = add i32 %8, %5 31 %indvars.iv.next = add i64 %indvars.iv, 1 32 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 33 %exitcond = icmp eq i32 %lftr.wideiv, %n 34 br i1 %exitcond, label %._crit_edge, label %.lr.ph 35 36._crit_edge: ; preds = %.lr.ph, %0 37 %sum.0.lcssa = phi i32 [ 0, %0 ], [ %9, %.lr.ph ] 38 ret i32 %sum.0.lcssa 39} 40 41;CHECK-LABEL: @reduction_prod( 42;CHECK: phi <4 x i32> 43;CHECK: load <4 x i32> 44;CHECK: mul <4 x i32> 45;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef> 46;CHECK: mul <4 x i32> 47;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> 48;CHECK: mul <4 x i32> 49;CHECK: extractelement <4 x i32> %{{.*}}, i32 0 50;CHECK: ret i32 51define i32 @reduction_prod(i32 %n, i32* noalias nocapture %A, i32* noalias nocapture %B) nounwind uwtable readonly noinline ssp { 52 %1 = icmp sgt i32 %n, 0 53 br i1 %1, label %.lr.ph, label %._crit_edge 54 55.lr.ph: ; preds = %0, %.lr.ph 56 %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ] 57 %prod.02 = phi i32 [ %9, %.lr.ph ], [ 1, %0 ] 58 %2 = getelementptr inbounds i32* %A, i64 %indvars.iv 59 %3 = load i32* %2, align 4 60 %4 = getelementptr inbounds i32* %B, i64 %indvars.iv 61 %5 = load i32* %4, align 4 62 %6 = trunc i64 %indvars.iv to i32 63 %7 = mul i32 %prod.02, %6 64 %8 = mul i32 %7, %3 65 %9 = mul i32 %8, %5 66 %indvars.iv.next = add i64 %indvars.iv, 1 67 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 68 %exitcond = icmp eq i32 %lftr.wideiv, %n 69 br i1 %exitcond, label %._crit_edge, label %.lr.ph 70 71._crit_edge: ; preds = %.lr.ph, %0 72 %prod.0.lcssa = phi i32 [ 1, %0 ], [ %9, %.lr.ph ] 73 ret i32 %prod.0.lcssa 74} 75 76;CHECK-LABEL: @reduction_mix( 77;CHECK: phi <4 x i32> 78;CHECK: load <4 x i32> 79;CHECK: mul nsw <4 x i32> 80;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef> 81;CHECK: add <4 x i32> 82;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> 83;CHECK: add <4 x i32> 84;CHECK: extractelement <4 x i32> %{{.*}}, i32 0 85;CHECK: ret i32 86define i32 @reduction_mix(i32 %n, i32* noalias nocapture %A, i32* noalias nocapture %B) nounwind uwtable readonly noinline ssp { 87 %1 = icmp sgt i32 %n, 0 88 br i1 %1, label %.lr.ph, label %._crit_edge 89 90.lr.ph: ; preds = %0, %.lr.ph 91 %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ] 92 %sum.02 = phi i32 [ %9, %.lr.ph ], [ 0, %0 ] 93 %2 = getelementptr inbounds i32* %A, i64 %indvars.iv 94 %3 = load i32* %2, align 4 95 %4 = getelementptr inbounds i32* %B, i64 %indvars.iv 96 %5 = load i32* %4, align 4 97 %6 = mul nsw i32 %5, %3 98 %7 = trunc i64 %indvars.iv to i32 99 %8 = add i32 %sum.02, %7 100 %9 = add i32 %8, %6 101 %indvars.iv.next = add i64 %indvars.iv, 1 102 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 103 %exitcond = icmp eq i32 %lftr.wideiv, %n 104 br i1 %exitcond, label %._crit_edge, label %.lr.ph 105 106._crit_edge: ; preds = %.lr.ph, %0 107 %sum.0.lcssa = phi i32 [ 0, %0 ], [ %9, %.lr.ph ] 108 ret i32 %sum.0.lcssa 109} 110 111;CHECK-LABEL: @reduction_mul( 112;CHECK: mul <4 x i32> 113;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef> 114;CHECK: mul <4 x i32> 115;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> 116;CHECK: mul <4 x i32> 117;CHECK: extractelement <4 x i32> %{{.*}}, i32 0 118;CHECK: ret i32 119define i32 @reduction_mul(i32 %n, i32* noalias nocapture %A, i32* noalias nocapture %B) nounwind uwtable readonly noinline ssp { 120 %1 = icmp sgt i32 %n, 0 121 br i1 %1, label %.lr.ph, label %._crit_edge 122 123.lr.ph: ; preds = %0, %.lr.ph 124 %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ] 125 %sum.02 = phi i32 [ %9, %.lr.ph ], [ 19, %0 ] 126 %2 = getelementptr inbounds i32* %A, i64 %indvars.iv 127 %3 = load i32* %2, align 4 128 %4 = getelementptr inbounds i32* %B, i64 %indvars.iv 129 %5 = load i32* %4, align 4 130 %6 = trunc i64 %indvars.iv to i32 131 %7 = add i32 %3, %6 132 %8 = add i32 %7, %5 133 %9 = mul i32 %8, %sum.02 134 %indvars.iv.next = add i64 %indvars.iv, 1 135 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 136 %exitcond = icmp eq i32 %lftr.wideiv, %n 137 br i1 %exitcond, label %._crit_edge, label %.lr.ph 138 139._crit_edge: ; preds = %.lr.ph, %0 140 %sum.0.lcssa = phi i32 [ 0, %0 ], [ %9, %.lr.ph ] 141 ret i32 %sum.0.lcssa 142} 143 144;CHECK-LABEL: @start_at_non_zero( 145;CHECK: phi <4 x i32> 146;CHECK: <i32 120, i32 0, i32 0, i32 0> 147;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef> 148;CHECK: add <4 x i32> 149;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> 150;CHECK: add <4 x i32> 151;CHECK: extractelement <4 x i32> %{{.*}}, i32 0 152;CHECK: ret i32 153define i32 @start_at_non_zero(i32* nocapture %in, i32* nocapture %coeff, i32* nocapture %out, i32 %n) nounwind uwtable readonly ssp { 154entry: 155 %cmp7 = icmp sgt i32 %n, 0 156 br i1 %cmp7, label %for.body, label %for.end 157 158for.body: ; preds = %entry, %for.body 159 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] 160 %sum.09 = phi i32 [ %add, %for.body ], [ 120, %entry ] 161 %arrayidx = getelementptr inbounds i32* %in, i64 %indvars.iv 162 %0 = load i32* %arrayidx, align 4 163 %arrayidx2 = getelementptr inbounds i32* %coeff, i64 %indvars.iv 164 %1 = load i32* %arrayidx2, align 4 165 %mul = mul nsw i32 %1, %0 166 %add = add nsw i32 %mul, %sum.09 167 %indvars.iv.next = add i64 %indvars.iv, 1 168 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 169 %exitcond = icmp eq i32 %lftr.wideiv, %n 170 br i1 %exitcond, label %for.end, label %for.body 171 172for.end: ; preds = %for.body, %entry 173 %sum.0.lcssa = phi i32 [ 120, %entry ], [ %add, %for.body ] 174 ret i32 %sum.0.lcssa 175} 176 177;CHECK-LABEL: @reduction_and( 178;CHECK: and <4 x i32> 179;CHECK: <i32 -1, i32 -1, i32 -1, i32 -1> 180;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef> 181;CHECK: and <4 x i32> 182;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> 183;CHECK: and <4 x i32> 184;CHECK: extractelement <4 x i32> %{{.*}}, i32 0 185;CHECK: ret i32 186define i32 @reduction_and(i32 %n, i32* nocapture %A, i32* nocapture %B) nounwind uwtable readonly { 187entry: 188 %cmp7 = icmp sgt i32 %n, 0 189 br i1 %cmp7, label %for.body, label %for.end 190 191for.body: ; preds = %entry, %for.body 192 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] 193 %result.08 = phi i32 [ %and, %for.body ], [ -1, %entry ] 194 %arrayidx = getelementptr inbounds i32* %A, i64 %indvars.iv 195 %0 = load i32* %arrayidx, align 4 196 %arrayidx2 = getelementptr inbounds i32* %B, i64 %indvars.iv 197 %1 = load i32* %arrayidx2, align 4 198 %add = add nsw i32 %1, %0 199 %and = and i32 %add, %result.08 200 %indvars.iv.next = add i64 %indvars.iv, 1 201 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 202 %exitcond = icmp eq i32 %lftr.wideiv, %n 203 br i1 %exitcond, label %for.end, label %for.body 204 205for.end: ; preds = %for.body, %entry 206 %result.0.lcssa = phi i32 [ -1, %entry ], [ %and, %for.body ] 207 ret i32 %result.0.lcssa 208} 209 210;CHECK-LABEL: @reduction_or( 211;CHECK: or <4 x i32> 212;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef> 213;CHECK: or <4 x i32> 214;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> 215;CHECK: or <4 x i32> 216;CHECK: extractelement <4 x i32> %{{.*}}, i32 0 217;CHECK: ret i32 218define i32 @reduction_or(i32 %n, i32* nocapture %A, i32* nocapture %B) nounwind uwtable readonly { 219entry: 220 %cmp7 = icmp sgt i32 %n, 0 221 br i1 %cmp7, label %for.body, label %for.end 222 223for.body: ; preds = %entry, %for.body 224 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] 225 %result.08 = phi i32 [ %or, %for.body ], [ 0, %entry ] 226 %arrayidx = getelementptr inbounds i32* %A, i64 %indvars.iv 227 %0 = load i32* %arrayidx, align 4 228 %arrayidx2 = getelementptr inbounds i32* %B, i64 %indvars.iv 229 %1 = load i32* %arrayidx2, align 4 230 %add = add nsw i32 %1, %0 231 %or = or i32 %add, %result.08 232 %indvars.iv.next = add i64 %indvars.iv, 1 233 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 234 %exitcond = icmp eq i32 %lftr.wideiv, %n 235 br i1 %exitcond, label %for.end, label %for.body 236 237for.end: ; preds = %for.body, %entry 238 %result.0.lcssa = phi i32 [ 0, %entry ], [ %or, %for.body ] 239 ret i32 %result.0.lcssa 240} 241 242;CHECK-LABEL: @reduction_xor( 243;CHECK: xor <4 x i32> 244;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef> 245;CHECK: xor <4 x i32> 246;CHECK: shufflevector <4 x i32> %{{.*}}, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef> 247;CHECK: xor <4 x i32> 248;CHECK: extractelement <4 x i32> %{{.*}}, i32 0 249;CHECK: ret i32 250define i32 @reduction_xor(i32 %n, i32* nocapture %A, i32* nocapture %B) nounwind uwtable readonly { 251entry: 252 %cmp7 = icmp sgt i32 %n, 0 253 br i1 %cmp7, label %for.body, label %for.end 254 255for.body: ; preds = %entry, %for.body 256 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] 257 %result.08 = phi i32 [ %xor, %for.body ], [ 0, %entry ] 258 %arrayidx = getelementptr inbounds i32* %A, i64 %indvars.iv 259 %0 = load i32* %arrayidx, align 4 260 %arrayidx2 = getelementptr inbounds i32* %B, i64 %indvars.iv 261 %1 = load i32* %arrayidx2, align 4 262 %add = add nsw i32 %1, %0 263 %xor = xor i32 %add, %result.08 264 %indvars.iv.next = add i64 %indvars.iv, 1 265 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 266 %exitcond = icmp eq i32 %lftr.wideiv, %n 267 br i1 %exitcond, label %for.end, label %for.body 268 269for.end: ; preds = %for.body, %entry 270 %result.0.lcssa = phi i32 [ 0, %entry ], [ %xor, %for.body ] 271 ret i32 %result.0.lcssa 272} 273 274; In this code the subtracted variable is on the RHS and this is not an induction variable. 275;CHECK-LABEL: @reduction_sub_rhs( 276;CHECK-NOT: phi <4 x i32> 277;CHECK-NOT: sub nsw <4 x i32> 278;CHECK: ret i32 279define i32 @reduction_sub_rhs(i32 %n, i32* noalias nocapture %A) nounwind uwtable readonly { 280entry: 281 %cmp4 = icmp sgt i32 %n, 0 282 br i1 %cmp4, label %for.body, label %for.end 283 284for.body: ; preds = %entry, %for.body 285 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] 286 %x.05 = phi i32 [ %sub, %for.body ], [ 0, %entry ] 287 %arrayidx = getelementptr inbounds i32* %A, i64 %indvars.iv 288 %0 = load i32* %arrayidx, align 4 289 %sub = sub nsw i32 %0, %x.05 290 %indvars.iv.next = add i64 %indvars.iv, 1 291 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 292 %exitcond = icmp eq i32 %lftr.wideiv, %n 293 br i1 %exitcond, label %for.end, label %for.body 294 295for.end: ; preds = %for.body, %entry 296 %x.0.lcssa = phi i32 [ 0, %entry ], [ %sub, %for.body ] 297 ret i32 %x.0.lcssa 298} 299 300 301; In this test the reduction variable is on the LHS and we can vectorize it. 302;CHECK-LABEL: @reduction_sub_lhs( 303;CHECK: phi <4 x i32> 304;CHECK: sub nsw <4 x i32> 305;CHECK: ret i32 306define i32 @reduction_sub_lhs(i32 %n, i32* noalias nocapture %A) nounwind uwtable readonly { 307entry: 308 %cmp4 = icmp sgt i32 %n, 0 309 br i1 %cmp4, label %for.body, label %for.end 310 311for.body: ; preds = %entry, %for.body 312 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] 313 %x.05 = phi i32 [ %sub, %for.body ], [ 0, %entry ] 314 %arrayidx = getelementptr inbounds i32* %A, i64 %indvars.iv 315 %0 = load i32* %arrayidx, align 4 316 %sub = sub nsw i32 %x.05, %0 317 %indvars.iv.next = add i64 %indvars.iv, 1 318 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 319 %exitcond = icmp eq i32 %lftr.wideiv, %n 320 br i1 %exitcond, label %for.end, label %for.body 321 322for.end: ; preds = %for.body, %entry 323 %x.0.lcssa = phi i32 [ 0, %entry ], [ %sub, %for.body ] 324 ret i32 %x.0.lcssa 325} 326 327; We can vectorize conditional reductions with multi-input phis. 328; CHECK: reduction_conditional 329; CHECK: fadd <4 x float> 330 331define float @reduction_conditional(float* %A, float* %B, float* %C, float %S) { 332entry: 333 br label %for.body 334 335for.body: 336 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.inc ] 337 %sum.033 = phi float [ %S, %entry ], [ %sum.1, %for.inc ] 338 %arrayidx = getelementptr inbounds float* %A, i64 %indvars.iv 339 %0 = load float* %arrayidx, align 4 340 %arrayidx2 = getelementptr inbounds float* %B, i64 %indvars.iv 341 %1 = load float* %arrayidx2, align 4 342 %cmp3 = fcmp ogt float %0, %1 343 br i1 %cmp3, label %if.then, label %for.inc 344 345if.then: 346 %cmp6 = fcmp ogt float %1, 1.000000e+00 347 br i1 %cmp6, label %if.then8, label %if.else 348 349if.then8: 350 %add = fadd fast float %sum.033, %0 351 br label %for.inc 352 353if.else: 354 %cmp14 = fcmp ogt float %0, 2.000000e+00 355 br i1 %cmp14, label %if.then16, label %for.inc 356 357if.then16: 358 %add19 = fadd fast float %sum.033, %1 359 br label %for.inc 360 361for.inc: 362 %sum.1 = phi float [ %add, %if.then8 ], [ %add19, %if.then16 ], [ %sum.033, %if.else ], [ %sum.033, %for.body ] 363 %indvars.iv.next = add i64 %indvars.iv, 1 364 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 365 %exitcond = icmp ne i32 %lftr.wideiv, 128 366 br i1 %exitcond, label %for.body, label %for.end 367 368for.end: 369 %sum.1.lcssa = phi float [ %sum.1, %for.inc ] 370 ret float %sum.1.lcssa 371} 372 373; We can't vectorize reductions with phi inputs from outside the reduction. 374; CHECK: noreduction_phi 375; CHECK-NOT: fadd <4 x float> 376define float @noreduction_phi(float* %A, float* %B, float* %C, float %S) { 377entry: 378 br label %for.body 379 380for.body: 381 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.inc ] 382 %sum.033 = phi float [ %S, %entry ], [ %sum.1, %for.inc ] 383 %arrayidx = getelementptr inbounds float* %A, i64 %indvars.iv 384 %0 = load float* %arrayidx, align 4 385 %arrayidx2 = getelementptr inbounds float* %B, i64 %indvars.iv 386 %1 = load float* %arrayidx2, align 4 387 %cmp3 = fcmp ogt float %0, %1 388 br i1 %cmp3, label %if.then, label %for.inc 389 390if.then: 391 %cmp6 = fcmp ogt float %1, 1.000000e+00 392 br i1 %cmp6, label %if.then8, label %if.else 393 394if.then8: 395 %add = fadd fast float %sum.033, %0 396 br label %for.inc 397 398if.else: 399 %cmp14 = fcmp ogt float %0, 2.000000e+00 400 br i1 %cmp14, label %if.then16, label %for.inc 401 402if.then16: 403 %add19 = fadd fast float %sum.033, %1 404 br label %for.inc 405 406for.inc: 407 %sum.1 = phi float [ %add, %if.then8 ], [ %add19, %if.then16 ], [ 0.000000e+00, %if.else ], [ %sum.033, %for.body ] 408 %indvars.iv.next = add i64 %indvars.iv, 1 409 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 410 %exitcond = icmp ne i32 %lftr.wideiv, 128 411 br i1 %exitcond, label %for.body, label %for.end 412 413for.end: 414 %sum.1.lcssa = phi float [ %sum.1, %for.inc ] 415 ret float %sum.1.lcssa 416} 417 418; We can't vectorize reductions that feed another header PHI. 419; CHECK: noredux_header_phi 420; CHECK-NOT: fadd <4 x float> 421 422define float @noredux_header_phi(float* %A, float* %B, float* %C, float %S) { 423entry: 424 br label %for.body 425 426for.body: 427 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 428 %sum2.09 = phi float [ 0.000000e+00, %entry ], [ %add1, %for.body ] 429 %sum.08 = phi float [ %S, %entry ], [ %add, %for.body ] 430 %arrayidx = getelementptr inbounds float* %B, i64 %indvars.iv 431 %0 = load float* %arrayidx, align 4 432 %add = fadd fast float %sum.08, %0 433 %add1 = fadd fast float %sum2.09, %add 434 %indvars.iv.next = add i64 %indvars.iv, 1 435 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 436 %exitcond = icmp ne i32 %lftr.wideiv, 128 437 br i1 %exitcond, label %for.body, label %for.end 438 439for.end: 440 %add1.lcssa = phi float [ %add1, %for.body ] 441 %add.lcssa = phi float [ %add, %for.body ] 442 %add2 = fadd fast float %add.lcssa, %add1.lcssa 443 ret float %add2 444} 445 446 447; When vectorizing a reduction whose loop header phi value is used outside the 448; loop special care must be taken. Otherwise, the reduced value feeding into the 449; outside user misses a few iterations (VF-1) of the loop. 450; PR16522 451 452; CHECK-LABEL: @phivalueredux( 453; CHECK-NOT: x i32> 454 455define i32 @phivalueredux(i32 %p) { 456entry: 457 br label %for.body 458 459for.body: 460 %t.03 = phi i32 [ 0, %entry ], [ %inc, %for.body ] 461 %p.addr.02 = phi i32 [ %p, %entry ], [ %xor, %for.body ] 462 %xor = xor i32 %p.addr.02, -1 463 %inc = add nsw i32 %t.03, 1 464 %exitcond = icmp eq i32 %inc, 16 465 br i1 %exitcond, label %for.end, label %for.body 466 467for.end: 468 ret i32 %p.addr.02 469} 470 471; Don't vectorize a reduction value that is not the last in a reduction cyle. We 472; would loose iterations (VF-1) on the operations after that use. 473; PR17498 474 475; CHECK-LABEL: not_last_operation 476; CHECK-NOT: x i32> 477define i32 @not_last_operation(i32 %p, i32 %val) { 478entry: 479 %tobool = icmp eq i32 %p, 0 480 br label %for.body 481 482for.body: 483 %inc613.1 = phi i32 [ 0, %entry ], [ %inc6.1, %for.body ] 484 %inc511.1 = phi i32 [ %val, %entry ], [ %inc5.1, %for.body ] 485 %0 = zext i1 %tobool to i32 486 %inc4.1 = xor i32 %0, 1 487 %inc511.1.inc4.1 = add nsw i32 %inc511.1, %inc4.1 488 %inc5.1 = add nsw i32 %inc511.1.inc4.1, 1 489 %inc6.1 = add nsw i32 %inc613.1, 1 490 %exitcond.1 = icmp eq i32 %inc6.1, 22 491 br i1 %exitcond.1, label %exit, label %for.body 492 493exit: 494 %inc.2 = add nsw i32 %inc511.1.inc4.1, 2 495 ret i32 %inc.2 496} 497