[Bug 90056] Unigine Valley regression since radeon/llvm: Run LLVM's instruction combining pass

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90056

--- Comment #13 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Tom Stellard from comment #12)
> (In reply to Andy Furniss from comment #10)
> > (In reply to Grigori Goronzy from comment #9)
> > > Created attachment 115409 [details] [review] [review] [review]
> > > Full shader
> > > 
> > > That does not help either. Seems to break the SSA somehow. Full shader that
> > > triggers the bug attached.
> > > 
> > > The patch I posted earlier help with the the reduced testcase, but not with
> > > the full shader. Both undef incoming values in phi nodes and undef branch
> > > conditions cause problems in different ways.
> > 
> > With the second patch + valley I get -
> > 
> > valley_x64: LiveVariables.cpp:114: void
> > llvm::LiveVariables::MarkVirtRegAliveInBlock(llvm::LiveVariables::VarInfo &,
> > llvm::MachineBasicBlock *, llvm::MachineBasicBlock *,
> > std::vector<MachineBasicBlock *> &): Assertion `MBB != &MF->front() &&
> > "Can't find reaching def for virtreg"' failed.
> 
> Did test with only the patch from comment #8 or did you test with both
> patches?

Just #8 but I just tried with both and get the same fail.

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