1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -S -O2 < %s | FileCheck %s 3 4; Test a single-iteration loop that should get SROAd once we realize that fact. 5; It should compile down to a bswap. 6 7; The helper function exists to avoid IPSCCP breaking the loop too early. 8 9define i16 @helper(i16 %0, i64 %x) { 10; CHECK-LABEL: @helper( 11; CHECK-NEXT: start: 12; CHECK-NEXT: [[DATA:%.*]] = alloca [2 x i8], align 2 13; CHECK-NEXT: store i16 [[TMP0:%.*]], ptr [[DATA]], align 2 14; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds nuw i8, ptr [[DATA]], i64 1 15; CHECK-NEXT: br label [[BB6_I_I:%.*]] 16; CHECK: bb6.i.i: 17; CHECK-NEXT: [[ITER_SROA_0_07_I_I:%.*]] = phi i64 [ [[TMP2:%.*]], [[BB6_I_I]] ], [ 0, [[START:%.*]] ] 18; CHECK-NEXT: [[_40_I_I:%.*]] = sub nsw i64 0, [[ITER_SROA_0_07_I_I]] 19; CHECK-NEXT: [[TMP2]] = add nuw nsw i64 [[ITER_SROA_0_07_I_I]], 1 20; CHECK-NEXT: [[_34_I_I:%.*]] = getelementptr inbounds nuw [0 x i8], ptr [[DATA]], i64 0, i64 [[ITER_SROA_0_07_I_I]] 21; CHECK-NEXT: [[_39_I_I:%.*]] = getelementptr inbounds [0 x i8], ptr [[TMP1]], i64 0, i64 [[_40_I_I]] 22; CHECK-NEXT: [[TMP_0_COPYLOAD_I_I_I_I:%.*]] = load i8, ptr [[_34_I_I]], align 1 23; CHECK-NEXT: [[TMP2_0_COPYLOAD_I_I_I_I:%.*]] = load i8, ptr [[_39_I_I]], align 1 24; CHECK-NEXT: store i8 [[TMP2_0_COPYLOAD_I_I_I_I]], ptr [[_34_I_I]], align 1 25; CHECK-NEXT: store i8 [[TMP_0_COPYLOAD_I_I_I_I]], ptr [[_39_I_I]], align 1 26; CHECK-NEXT: [[EXITCOND_NOT_I_I:%.*]] = icmp eq i64 [[TMP2]], [[X:%.*]] 27; CHECK-NEXT: br i1 [[EXITCOND_NOT_I_I]], label [[EXIT:%.*]], label [[BB6_I_I]] 28; CHECK: exit: 29; CHECK-NEXT: [[DOTSROA_0_0_COPYLOAD:%.*]] = load i16, ptr [[DATA]], align 2 30; CHECK-NEXT: ret i16 [[DOTSROA_0_0_COPYLOAD]] 31; 32start: 33 %data = alloca [2 x i8], align 2 34 store i16 %0, ptr %data, align 2 35 %1 = getelementptr inbounds i8, ptr %data, i64 2 36 %2 = getelementptr inbounds i8, ptr %1, i64 -1 37 br label %bb6.i.i 38 39bb6.i.i: 40 %iter.sroa.0.07.i.i = phi i64 [ %4, %bb6.i.i ], [ 0, %start ] 41 %3 = xor i64 %iter.sroa.0.07.i.i, -1 42 %_40.i.i = add nsw i64 1, %3 43 %4 = add nuw nsw i64 %iter.sroa.0.07.i.i, 1 44 %_34.i.i = getelementptr inbounds [0 x i8], ptr %data, i64 0, i64 %iter.sroa.0.07.i.i 45 %_39.i.i = getelementptr inbounds [0 x i8], ptr %2, i64 0, i64 %_40.i.i 46 %tmp.0.copyload.i.i.i.i = load i8, ptr %_34.i.i, align 1 47 %tmp2.0.copyload.i.i.i.i = load i8, ptr %_39.i.i, align 1 48 store i8 %tmp2.0.copyload.i.i.i.i, ptr %_34.i.i, align 1 49 store i8 %tmp.0.copyload.i.i.i.i, ptr %_39.i.i, align 1 50 %exitcond.not.i.i = icmp eq i64 %4, %x 51 br i1 %exitcond.not.i.i, label %exit, label %bb6.i.i 52 53exit: 54 %.sroa.0.0.copyload = load i16, ptr %data, align 2 55 ret i16 %.sroa.0.0.copyload 56} 57 58define i16 @test(i16 %arg) { 59; CHECK-LABEL: @test( 60; CHECK-NEXT: bb6.i.i.i: 61; CHECK-NEXT: [[DATA_I_SROA_0_0_INSERT_INSERT:%.*]] = tail call i16 @llvm.bswap.i16(i16 [[ARG:%.*]]) 62; CHECK-NEXT: ret i16 [[DATA_I_SROA_0_0_INSERT_INSERT]] 63; 64 %ret = call i16 @helper(i16 %arg, i64 1) 65 ret i16 %ret 66} 67