1; RUN: llc < %s -march=avr | FileCheck %s
2target triple = "avr-unknown-unknown"
3
4; The case illustrate DAG schedular may pre-schedule the node has
5; ADJCALLSTACKDOWN parent, so ADJCALLSTACKUP may hold CallResource too long
6; and make other calls can't be scheduled. If there's no other available node
7; to schedule, the scheduler will try to rename the register by creating the
8; copy to avoid the conflict which will fail because CallResource is not a real
9; physical register.
10;
11; The issue is found by Tim on https://github.com/avr-rust/rust/issues/111 and
12; discuss in http://lists.llvm.org/pipermail/llvm-dev/2018-October/127083.html.
13
14define void @"main"() addrspace(1) {
15start:
16  %0 = or i64 undef, undef
17   br i1 undef, label %mul_and_call, label %fail
18
19  mul_and_call:
20  %1 = mul i64 %0, %0
21  call addrspace(1) void @"three_ints"(i64 undef, i64 %1, i64 %0)
22; The CHECK line only want to make sure the following assertion message
23; won't trigger due to create copy of artificial CallResource register.
24; llc: llvm/lib/CodeGen/TargetRegisterInfo.cpp:203: const llvm::TargetRegisterClass* llvm::TargetRegisterInfo::getMinimalPhysRegClass(unsigned int, llvm::MVT) const: Assertion `BestRC && "Couldn't find the register class"' failed.
25; CHECK: call    __muldi3
26  ret void
27
28  fail:
29    ret void
30}
31
32declare void @"three_ints"(i64, i64, i64) addrspace(1)
33