1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -S -passes=loop-unroll -unroll-allow-partial %s | FileCheck %s 3 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 not 6; 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]], 1 17; 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 8 20; CHECK-NEXT: [[LOAD2:%.*]] = load i64, ptr [[GEP2]], align 8 21; 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]], 2 27; 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 8 30; CHECK-NEXT: [[LOAD2_1:%.*]] = load i64, ptr [[GEP2_1]], align 8 31; 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]], 3 37; 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 8 40; CHECK-NEXT: [[LOAD2_2:%.*]] = load i64, ptr [[GEP2_2]], align 8 41; 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]], 4 47; 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 8 50; CHECK-NEXT: [[LOAD2_3:%.*]] = load i64, ptr [[GEP2_3]], align 8 51; 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]], 24 55; 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]], 5 58; 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 8 61; CHECK-NEXT: [[LOAD2_4:%.*]] = load i64, ptr [[GEP2_4]], align 8 62; 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 %loop 70 71loop: 72 %iv = phi i64 [ 0, %start ], [ %iv.next, %latch ] 73 %exitcond = icmp eq i64 %iv, 24 74 br i1 %exitcond, label %exit, label %latch 75 76latch: 77 %iv.next = add nuw nsw i64 %iv, 1 78 %gep1 = getelementptr inbounds i64, ptr %a1, i64 %iv 79 %gep2 = getelementptr inbounds i64, ptr %a2, i64 %iv 80 %load1 = load i64, ptr %gep1, align 8 81 %load2 = load i64, ptr %gep2, align 8 82 %exitcond2 = icmp eq i64 %load1, %load2 83 br i1 %exitcond2, label %loop, label %exit 84 85exit: 86 %exit.val = phi i1 [ false, %latch ], [ true, %loop ] 87 ret i1 %exit.val 88} 89