| ; RUN: llc -verify-machineinstrs -mtriple=arm64-apple-ios7.0 -o - %s | FileCheck %s |
| @var = global void()* zeroinitializer |
| |
| declare void @bar() |
| |
| define void @foo() { |
| ; CHECK-LABEL: foo: |
| %func = load void()*, void()** @var |
| |
| ; Calling a function encourages @foo to use a callee-saved register, |
| ; which makes it a natural choice for the tail call itself. But we don't |
| ; want that: the final "br xN" has to use a temporary or argument |
| ; register. |
| call void @bar() |
| |
| tail call void %func() |
| ; CHECK: br {{x([0-79]|1[0-8])}} |
| ret void |
| } |
| |
| ; No matter how tempting it is, LLVM should not use x30 since that'll be |
| ; restored to its incoming value before the "br". |
| define void @test_x30_tail() { |
| ; CHECK-LABEL: test_x30_tail: |
| ; CHECK: mov [[DEST:x[0-9]+]], x30 |
| ; CHECK: br [[DEST]] |
| %addr = call i8* @llvm.returnaddress(i32 0) |
| %faddr = bitcast i8* %addr to void()* |
| tail call void %faddr() |
| ret void |
| } |
| |
| declare i8* @llvm.returnaddress(i32) |
