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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt -S -passes=loop-unroll -unroll-allow-partial %s | FileCheck %s3 4; This is a variant on full-unroll-non-latch-exit.ll for partial unrolling.5; This test is primarily interested in making sure that latches are not6; folded incorrectly, not that a transform occurs.7 8define i1 @test(ptr %a1, ptr %a2) {9; CHECK-LABEL: @test(10; CHECK-NEXT: start:11; CHECK-NEXT: br label [[LOOP:%.*]]12; CHECK: loop:13; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, [[START:%.*]] ], [ [[IV_NEXT_4:%.*]], [[LATCH_4:%.*]] ]14; CHECK-NEXT: br label [[LATCH:%.*]]15; CHECK: latch:16; CHECK-NEXT: [[IV_NEXT:%.*]] = add nuw nsw i64 [[IV]], 117; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds i64, ptr [[A1:%.*]], i64 [[IV]]18; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds i64, ptr [[A2:%.*]], i64 [[IV]]19; CHECK-NEXT: [[LOAD1:%.*]] = load i64, ptr [[GEP1]], align 820; CHECK-NEXT: [[LOAD2:%.*]] = load i64, ptr [[GEP2]], align 821; CHECK-NEXT: [[EXITCOND2:%.*]] = icmp eq i64 [[LOAD1]], [[LOAD2]]22; CHECK-NEXT: br i1 [[EXITCOND2]], label [[LOOP_1:%.*]], label [[EXIT:%.*]]23; CHECK: loop.1:24; CHECK-NEXT: br label [[LATCH_1:%.*]]25; CHECK: latch.1:26; CHECK-NEXT: [[IV_NEXT_1:%.*]] = add nuw nsw i64 [[IV]], 227; CHECK-NEXT: [[GEP1_1:%.*]] = getelementptr inbounds i64, ptr [[A1]], i64 [[IV_NEXT]]28; CHECK-NEXT: [[GEP2_1:%.*]] = getelementptr inbounds i64, ptr [[A2]], i64 [[IV_NEXT]]29; CHECK-NEXT: [[LOAD1_1:%.*]] = load i64, ptr [[GEP1_1]], align 830; CHECK-NEXT: [[LOAD2_1:%.*]] = load i64, ptr [[GEP2_1]], align 831; CHECK-NEXT: [[EXITCOND2_1:%.*]] = icmp eq i64 [[LOAD1_1]], [[LOAD2_1]]32; CHECK-NEXT: br i1 [[EXITCOND2_1]], label [[LOOP_2:%.*]], label [[EXIT]]33; CHECK: loop.2:34; CHECK-NEXT: br label [[LATCH_2:%.*]]35; CHECK: latch.2:36; CHECK-NEXT: [[IV_NEXT_2:%.*]] = add nuw nsw i64 [[IV]], 337; CHECK-NEXT: [[GEP1_2:%.*]] = getelementptr inbounds i64, ptr [[A1]], i64 [[IV_NEXT_1]]38; CHECK-NEXT: [[GEP2_2:%.*]] = getelementptr inbounds i64, ptr [[A2]], i64 [[IV_NEXT_1]]39; CHECK-NEXT: [[LOAD1_2:%.*]] = load i64, ptr [[GEP1_2]], align 840; CHECK-NEXT: [[LOAD2_2:%.*]] = load i64, ptr [[GEP2_2]], align 841; CHECK-NEXT: [[EXITCOND2_2:%.*]] = icmp eq i64 [[LOAD1_2]], [[LOAD2_2]]42; CHECK-NEXT: br i1 [[EXITCOND2_2]], label [[LOOP_3:%.*]], label [[EXIT]]43; CHECK: loop.3:44; CHECK-NEXT: br label [[LATCH_3:%.*]]45; CHECK: latch.3:46; CHECK-NEXT: [[IV_NEXT_3:%.*]] = add nuw nsw i64 [[IV]], 447; CHECK-NEXT: [[GEP1_3:%.*]] = getelementptr inbounds i64, ptr [[A1]], i64 [[IV_NEXT_2]]48; CHECK-NEXT: [[GEP2_3:%.*]] = getelementptr inbounds i64, ptr [[A2]], i64 [[IV_NEXT_2]]49; CHECK-NEXT: [[LOAD1_3:%.*]] = load i64, ptr [[GEP1_3]], align 850; CHECK-NEXT: [[LOAD2_3:%.*]] = load i64, ptr [[GEP2_3]], align 851; CHECK-NEXT: [[EXITCOND2_3:%.*]] = icmp eq i64 [[LOAD1_3]], [[LOAD2_3]]52; CHECK-NEXT: br i1 [[EXITCOND2_3]], label [[LOOP_4:%.*]], label [[EXIT]]53; CHECK: loop.4:54; CHECK-NEXT: [[EXITCOND_4:%.*]] = icmp eq i64 [[IV_NEXT_3]], 2455; CHECK-NEXT: br i1 [[EXITCOND_4]], label [[EXIT]], label [[LATCH_4]]56; CHECK: latch.4:57; CHECK-NEXT: [[IV_NEXT_4]] = add nuw nsw i64 [[IV]], 558; CHECK-NEXT: [[GEP1_4:%.*]] = getelementptr inbounds i64, ptr [[A1]], i64 [[IV_NEXT_3]]59; CHECK-NEXT: [[GEP2_4:%.*]] = getelementptr inbounds i64, ptr [[A2]], i64 [[IV_NEXT_3]]60; CHECK-NEXT: [[LOAD1_4:%.*]] = load i64, ptr [[GEP1_4]], align 861; CHECK-NEXT: [[LOAD2_4:%.*]] = load i64, ptr [[GEP2_4]], align 862; CHECK-NEXT: [[EXITCOND2_4:%.*]] = icmp eq i64 [[LOAD1_4]], [[LOAD2_4]]63; CHECK-NEXT: br i1 [[EXITCOND2_4]], label [[LOOP]], label [[EXIT]]64; CHECK: exit:65; CHECK-NEXT: [[EXIT_VAL:%.*]] = phi i1 [ false, [[LATCH]] ], [ false, [[LATCH_1]] ], [ false, [[LATCH_2]] ], [ false, [[LATCH_3]] ], [ true, [[LOOP_4]] ], [ false, [[LATCH_4]] ]66; CHECK-NEXT: ret i1 [[EXIT_VAL]]67;68start:69 br label %loop70 71loop:72 %iv = phi i64 [ 0, %start ], [ %iv.next, %latch ]73 %exitcond = icmp eq i64 %iv, 2474 br i1 %exitcond, label %exit, label %latch75 76latch:77 %iv.next = add nuw nsw i64 %iv, 178 %gep1 = getelementptr inbounds i64, ptr %a1, i64 %iv79 %gep2 = getelementptr inbounds i64, ptr %a2, i64 %iv80 %load1 = load i64, ptr %gep1, align 881 %load2 = load i64, ptr %gep2, align 882 %exitcond2 = icmp eq i64 %load1, %load283 br i1 %exitcond2, label %loop, label %exit84 85exit:86 %exit.val = phi i1 [ false, %latch ], [ true, %loop ]87 ret i1 %exit.val88}89