mirror of
https://github.com/RPCS3/llvm.git
synced 2026-07-20 19:04:10 -04:00
Jeremy Morse
04fd1a03bc
MCP currently uses changeDebugValuesDefReg / collectDebugValues to find debug users of a register, however those functions assume that all DBG_VALUEs immediately follow the specified instruction, which isn't necessarily true. This is going to become very often untrue when we turn off CodeGenPrepare::placeDbgValues. Instead of calling changeDebugValuesDefReg on an instruction to change its debug users, in this patch we instead collect DBG_VALUEs of copies as we iterate over insns, and update the debug users of copies that are made dead. This isn't a non-functional change, because MCP will now update DBG_VALUEs that aren't immediately after a copy, but refer to the same register. I've hijacked the regression test for PR38773 to test for this new behaviour, an entirely new test seemed overkill. Differential Revision: https://reviews.llvm.org/D56265 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@368835 91177308-0d34-0410-b5e6-96231b3b80d8