| ; 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) |