1 ; RUN: llc -o - %s | FileCheck %s
2 ; RUN: llc -global-isel -verify-machineinstrs -o - %s | FileCheck %s
3 target triple="aarch64--"
5 declare void @somefunc()
6 define preserve_allcc void @test_ccmismatch_notail() {
7 ; Ensure that no tail call is used here, as the called function somefunc does
8 ; not preserve enough registers for preserve_allcc.
9 ; CHECK-LABEL: test_ccmismatch_notail:
10 ; CHECK-NOT: b somefunc
12 tail call void @somefunc()
16 declare preserve_allcc void @some_preserve_all_func()
17 define void @test_ccmismatch_tail() {
18 ; We can perform a tail call here, because some_preserve_all_func preserves
19 ; all registers necessary for test_ccmismatch_tail.
20 ; CHECK-LABEL: test_ccmismatch_tail:
21 ; CHECK-NOT: bl some_preserve_all_func
22 ; CHECK: b some_preserve_all_func
23 tail call preserve_allcc void @some_preserve_all_func()