blob: c724eea5d365520015ef8496aa3df18f0066bd1e [file] [log] [blame]
; RUN: llc < %s -march=avr | FileCheck %s
target triple = "avr-unknown-unknown"
; The case illustrate DAG schedular may pre-schedule the node has
; ADJCALLSTACKDOWN parent, so ADJCALLSTACKUP may hold CallResource too long
; and make other calls can't be scheduled. If there's no other available node
; to schedule, the scheduler will try to rename the register by creating the
; copy to avoid the conflict which will fail because CallResource is not a real
; physical register.
; The issue is found by Tim on and
; discuss in
define void @"main"() addrspace(1) {
%0 = or i64 undef, undef
br i1 undef, label %mul_and_call, label %fail
%1 = mul i64 %0, %0
call addrspace(1) void @"three_ints"(i64 undef, i64 %1, i64 %0)
; The CHECK line only want to make sure the following assertion message
; won't trigger due to create copy of artificial CallResource register.
; 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.
; CHECK: call __muldi3
ret void
ret void
declare void @"three_ints"(i64, i64, i64) addrspace(1)