[llvm-dev] Getting TargetLowering in AsmPrinter / Lowering constant addrspacecast
Tom Stellard via llvm-dev
llvm-dev at lists.llvm.org
Mon Dec 14 15:59:56 PST 2015
On Tue, Dec 15, 2015 at 12:41:57AM +0100, Manuel Jacob via llvm-dev wrote:
> I'd like to add support for addrspacecast in initializers of global
> variables, at least for the trivial case. The trivial case is if
> TargetLowering::isNoopAddrSpaceCast(SrcAS, DestAS) returns true. In
> this case the MCExpr for the addrspacecast is the MCExpr of its first
You could create a Util directory and put the implementation of
isNoopAddrSpaceCast in there. We do this in AMDGPU when we want
to share code between the MC and non-MC parts of the compiler.
> It seems hard to obtain an instance of TargetLowering in
> AsmPrinter::lowerConstant(). Other methods in this class obtain it by
> calling `MF->getSubtarget().getTargetLowering()`. However, because MF
> is nullptr when lowering initializers of global variables, it won't
> work. My impression is that this is not possible because every function
> has its own TargetLowering instance. Is that correct?
> NVPTX solves the problem by having a method on it's NVPTXAsmPrinter
> class, which is mostly a copy of AsmPrinter::lowerConstant() and knows
> how to handle addrspacecasts. However, this probably isn't a solution
> for e.g. X86.
> Suggestions are highly welcome.
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