1; RUN: llc -verify-machineinstrs -mtriple=arm64-apple-ios7.0 -o - %s | FileCheck %s 2@var = global ptr zeroinitializer 3 4declare void @bar() 5 6define void @foo() { 7; CHECK-LABEL: foo: 8 %func = load ptr, ptr @var 9 10 ; Calling a function encourages @foo to use a callee-saved register, 11 ; which makes it a natural choice for the tail call itself. But we don't 12 ; want that: the final "br xN" has to use a temporary or argument 13 ; register. 14 call void @bar() 15 16 tail call void %func() 17; CHECK: br {{x([0-79]|1[0-8])}} 18 ret void 19} 20 21; No matter how tempting it is, LLVM should not use x30 since that'll be 22; restored to its incoming value before the "br". 23define void @test_x30_tail() { 24; CHECK-LABEL: test_x30_tail: 25; CHECK: mov [[DEST:x[0-9]+]], x30 26; CHECK: br [[DEST]] 27 %addr = call ptr @llvm.returnaddress(i32 0) 28 tail call void %addr() 29 ret void 30} 31 32declare ptr @llvm.returnaddress(i32) 33