33 lines
1.3 KiB
LLVM
33 lines
1.3 KiB
LLVM
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; RUN: llc < %s -march=avr | FileCheck %s
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target triple = "avr-unknown-unknown"
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; The case illustrate DAG schedular may pre-schedule the node has
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; ADJCALLSTACKDOWN parent, so ADJCALLSTACKUP may hold CallResource too long
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; and make other calls can't be scheduled. If there's no other available node
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; to schedule, the scheduler will try to rename the register by creating the
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; copy to avoid the conflict which will fail because CallResource is not a real
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; physical register.
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;
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; The issue is found by Tim on https://github.com/avr-rust/rust/issues/111 and
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; discuss in http://lists.llvm.org/pipermail/llvm-dev/2018-October/127083.html.
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define void @"main"() addrspace(1) {
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start:
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%0 = or i64 undef, undef
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br i1 undef, label %mul_and_call, label %fail
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mul_and_call:
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%1 = mul i64 %0, %0
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call addrspace(1) void @"three_ints"(i64 undef, i64 %1, i64 %0)
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; The CHECK line only want to make sure the following assertion message
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; won't trigger due to create copy of artificial CallResource register.
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; 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.
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; CHECK: call __muldi3
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ret void
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fail:
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ret void
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}
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declare void @"three_ints"(i64, i64, i64) addrspace(1)
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