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1; With Darwin PCS, non-virtual thunks generated are generated with musttail2; and are expected to build3; In general Darwin PCS should be tail optimized4; RUN: llc -mtriple=arm64-apple-ios5.0.0 < %s | FileCheck %s5 6; CHECK-LABEL: __ZThn16_N1C3addEPKcz:7; CHECK: b __ZN1C3addEPKcz8 9; CHECK-LABEL: _tailTest:10; CHECK: b __ZN1C3addEPKcz11 12; CHECK-LABEL: __ZThn8_N1C1fEiiiiiiiiiz:13; CHECK: b __ZN1C1fEiiiiiiiiiz14 15%class.C = type { %class.A.base, [4 x i8], %class.B.base, [4 x i8] }16%class.A.base = type <{ ptr, i32 }>17%class.B.base = type <{ ptr, i32 }>18 19declare void @_ZN1C3addEPKcz(ptr, ptr, ...) unnamed_addr #0 align 220 21define void @_ZThn16_N1C3addEPKcz(ptr %0, ptr %1, ...) unnamed_addr #0 align 2 {22 musttail call void (ptr, ptr, ...) @_ZN1C3addEPKcz(ptr noundef nonnull align 8 dereferenceable(28) undef, ptr noundef %1, ...)23 ret void24}25 26define void @tailTest(ptr %0, ptr %1, ...) unnamed_addr #0 align 2 {27 tail call void (ptr, ptr, ...) @_ZN1C3addEPKcz(ptr noundef nonnull align 8 dereferenceable(28) undef, ptr noundef %1)28 ret void29}30 31declare void @_ZN1C1fEiiiiiiiiiz(ptr %0, i32 %1, i32 %2, i32 %3, i32 %4, i32 %5, i32 %6, i32 %7, i32 %8, i32 noundef %9, ...) unnamed_addr #1 align 232 33define void @_ZThn8_N1C1fEiiiiiiiiiz(ptr %0, i32 %1, i32 %2, i32 %3, i32 %4, i32 %5, i32 %6, i32 %7, i32 %8, i32 noundef %9, ...) unnamed_addr #1 align 2 {34 musttail call void (ptr, i32, i32, i32, i32, i32, i32, i32, i32, i32, ...) @_ZN1C1fEiiiiiiiiiz(ptr nonnull align 8 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 noundef %9, ...)35 ret void36}37