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1# RUN: llc --verify-machineinstrs -mtriple=aarch64 -o - %s -run-pass pipeliner -aarch64-enable-pipeliner -debug-only=pipeliner 2>&1 | FileCheck %s2# REQUIRES: asserts3 4# An unacceptable loop by pipeliner: No exits5# CHECK: Unable to analyzeLoop, can NOT pipeline Loop6 7--- |8 define dso_local void @func(ptr noalias nocapture noundef writeonly %a, ptr nocapture noundef readonly %b, i32 noundef %n) local_unnamed_addr #0 {9 entry:10 %cmp6 = icmp sgt i32 %n, 011 br i1 %cmp6, label %for.body.preheader, label %for.cond.cleanup12 13 for.body.preheader: ; preds = %entry14 %wide.trip.count = zext nneg i32 %n to i6415 br label %for.body16 17 for.cond.cleanup: ; preds = %for.body, %entry18 ret void19 20 for.body: ; preds = %for.body.preheader, %for.body21 %lsr.iv11 = phi i64 [ %wide.trip.count, %for.body.preheader ], [ %lsr.iv.next, %for.body ]22 %lsr.iv9 = phi ptr [ %b, %for.body.preheader ], [ %scevgep10, %for.body ]23 %lsr.iv = phi ptr [ %a, %for.body.preheader ], [ %scevgep, %for.body ]24 %0 = load float, ptr %lsr.iv9, align 425 %add = fadd float %0, 1.000000e+0026 store float %add, ptr %lsr.iv, align 427 %scevgep = getelementptr i8, ptr %lsr.iv, i64 428 %scevgep10 = getelementptr i8, ptr %lsr.iv9, i64 429 %lsr.iv.next = add nsw i64 %lsr.iv11, -130 %exitcond.not = icmp eq i64 %lsr.iv.next, 031 br i1 %exitcond.not, label %for.cond.cleanup, label %for.body32 }33 34...35---36name: func37tracksRegLiveness: true38liveins:39 - { reg: '$x0', virtual-reg: '%7' }40 - { reg: '$x1', virtual-reg: '%8' }41 - { reg: '$w2', virtual-reg: '%9' }42body: |43 bb.0.entry:44 successors: %bb.1(0x50000000), %bb.2(0x30000000)45 liveins: $x0, $x1, $w246 47 %9:gpr32common = COPY $w248 %8:gpr64 = COPY $x149 %7:gpr64 = COPY $x050 dead $wzr = SUBSWri %9, 1, 0, implicit-def $nzcv51 Bcc 11, %bb.2, implicit $nzcv52 B %bb.153 54 bb.1.for.body.preheader:55 %11:gpr32 = ORRWrs $wzr, %9, 056 %0:gpr64all = SUBREG_TO_REG 0, killed %11, %subreg.sub_3257 %14:fpr32 = FMOVSi 11258 B %bb.359 60 bb.2.for.cond.cleanup:61 RET_ReallyLR62 63 bb.3.for.body:64 successors: %bb.3(0x7c000000)65 66 %1:gpr64sp = PHI %0, %bb.1, %6, %bb.367 %2:gpr64sp = PHI %8, %bb.1, %5, %bb.368 %3:gpr64sp = PHI %7, %bb.1, %4, %bb.369 early-clobber %12:gpr64sp, %13:fpr32 = LDRSpost %2, 4 :: (load (s32) from %ir.lsr.iv9)70 %15:fpr32 = nofpexcept FADDSrr killed %13, %14, implicit $fpcr71 early-clobber %16:gpr64sp = STRSpost killed %15, %3, 4 :: (store (s32) into %ir.lsr.iv)72 %4:gpr64all = COPY %1673 %5:gpr64all = COPY %1274 %17:gpr64 = nsw SUBSXri %1, 1, 0, implicit-def $nzcv75 %6:gpr64all = COPY %1776 B %bb.377 78...79