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Diffstat (limited to 'llvm/test/CodeGen/AVR/pre-schedule.ll')
| -rw-r--r-- | llvm/test/CodeGen/AVR/pre-schedule.ll | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/AVR/pre-schedule.ll b/llvm/test/CodeGen/AVR/pre-schedule.ll new file mode 100644 index 00000000000..c724eea5d36 --- /dev/null +++ b/llvm/test/CodeGen/AVR/pre-schedule.ll @@ -0,0 +1,32 @@ +; 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 https://github.com/avr-rust/rust/issues/111 and +; discuss in http://lists.llvm.org/pipermail/llvm-dev/2018-October/127083.html. + +define void @"main"() addrspace(1) { +start: + %0 = or i64 undef, undef + br i1 undef, label %mul_and_call, label %fail + + mul_and_call: + %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 + + fail: + ret void +} + +declare void @"three_ints"(i64, i64, i64) addrspace(1) |
