1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4 2; RUN: opt -S -passes=loop-idiom < %s | FileCheck %s 3 4; The poison flags should be preserved, as no transform takes place. 5define void @test(ptr %p.end, ptr %p.start) { 6; CHECK-LABEL: define void @test( 7; CHECK-SAME: ptr [[P_END:%.*]], ptr [[P_START:%.*]]) { 8; CHECK-NEXT: entry: 9; CHECK-NEXT: [[P_END_INT:%.*]] = ptrtoint ptr [[P_END]] to i64 10; CHECK-NEXT: [[P_START_INT:%.*]] = ptrtoint ptr [[P_START]] to i64 11; CHECK-NEXT: [[DIST:%.*]] = sub nuw i64 [[P_END_INT]], [[P_START_INT]] 12; CHECK-NEXT: [[LEN:%.*]] = lshr exact i64 [[DIST]], 5 13; CHECK-NEXT: [[CMP:%.*]] = icmp eq ptr [[P_END]], [[P_START]] 14; CHECK-NEXT: br i1 [[CMP]], label [[EXIT:%.*]], label [[PREHEADER:%.*]] 15; CHECK: preheader: 16; CHECK-NEXT: br label [[LOOP:%.*]] 17; CHECK: loop: 18; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[LEN]], [[PREHEADER]] ], [ [[IV_DEC:%.*]], [[LOOP]] ] 19; CHECK-NEXT: [[IV_NEG:%.*]] = sub nsw i64 0, [[IV]] 20; CHECK-NEXT: [[SRC:%.*]] = getelementptr inbounds [32 x i8], ptr [[P_END]], i64 [[IV_NEG]] 21; CHECK-NEXT: [[V:%.*]] = load <4 x i64>, ptr [[SRC]], align 8 22; CHECK-NEXT: [[DST:%.*]] = getelementptr inbounds [32 x i8], ptr [[P_START]], i64 [[IV_NEG]] 23; CHECK-NEXT: store <4 x i64> [[V]], ptr [[DST]], align 8 24; CHECK-NEXT: [[IV_DEC]] = add i64 [[IV]], -1 25; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i64 [[IV_DEC]], 0 26; CHECK-NEXT: br i1 [[CMP2]], label [[LOOP_EXIT:%.*]], label [[LOOP]] 27; CHECK: loop.exit: 28; CHECK-NEXT: br label [[EXIT]] 29; CHECK: exit: 30; CHECK-NEXT: ret void 31; 32entry: 33 %p.end.int = ptrtoint ptr %p.end to i64 34 %p.start.int = ptrtoint ptr %p.start to i64 35 %dist = sub nuw i64 %p.end.int, %p.start.int 36 %len = lshr exact i64 %dist, 5 37 %cmp = icmp eq ptr %p.end, %p.start 38 br i1 %cmp, label %exit, label %preheader 39 40preheader: 41 br label %loop 42 43loop: 44 %iv = phi i64 [ %len, %preheader ], [ %iv.dec, %loop ] 45 %iv.neg = sub nsw i64 0, %iv 46 %src = getelementptr inbounds [32 x i8], ptr %p.end, i64 %iv.neg 47 %v = load <4 x i64>, ptr %src, align 8 48 %dst = getelementptr inbounds [32 x i8], ptr %p.start, i64 %iv.neg 49 store <4 x i64> %v, ptr %dst, align 8 50 %iv.dec = add i64 %iv, -1 51 %cmp2 = icmp eq i64 %iv.dec, 0 52 br i1 %cmp2, label %loop.exit, label %loop 53 54loop.exit: 55 br label %exit 56 57exit: 58 ret void 59} 60