mirror of
https://github.com/RPCS3/llvm.git
synced 2025-05-14 17:36:29 +00:00
2b9ba6c223
------------------------------------------------------------------------ r326769 | bjope | 2018-03-06 00:47:07 -0800 (Tue, 06 Mar 2018) | 28 lines [DebugInfo] Discard invalid DBG_VALUE instructions in LiveDebugVariables Summary: This is a workaround for pr36417 https://bugs.llvm.org/show_bug.cgi?id=36417 LiveDebugVariables will now verify that the DBG_VALUE instructions are sane (prior to register allocation) by asking LIS if a virtual register used in the DBG_VALUE is live (or dead def) in the slot index before the DBG_VALUE. If it isn't sane the DBG_VALUE is discarded. One pass that was identified as introducing non-sane DBG_VALUE instructtons, when analysing pr36417, was the DAG->DAG Instruction Selection. It sometimes inserts DBG_VALUE instructions referring to a virtual register that is defined later in the same basic block. So it is a use before def kind of problem. The DBG_VALUE is typically inserted in the beginning of a basic block when this happens. The problem can be seen in the test case test/DebugInfo/X86/dbg-value-inlined-parameter.ll Reviewers: aprantl, rnk, probinson Reviewed By: aprantl Subscribers: vsk, davide, alexcrichton, Ka-Ka, eraman, llvm-commits, JDevlieghere Differential Revision: https://reviews.llvm.org/D43956 ------------------------------------------------------------------------ ------------------------------------------------------------------------ r326780 | bjope | 2018-03-06 05:23:28 -0800 (Tue, 06 Mar 2018) | 6 lines Fixup for rL326769 (RegState::Debug is being truncated to a bool) I obviously messed up arguments to MachineOperand::CreateReg in rL326769. This should make it work as intended. Thanks to RKSimon for spotting this. ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@329668 91177308-0d34-0410-b5e6-96231b3b80d8