[llvm-dev] Adding Flag Support in LLVM Backend
Grang, Mandeep Singh via llvm-dev
llvm-dev at lists.llvm.org
Fri Jul 21 10:25:33 PDT 2017
Your cl::opt definition seems correct but the definition from llc.cpp is
not visible in X86ISelLowring.cpp. The general practice is to define the
cl::opt variable in the file you want to use it in. So you could try
moving the definition to X86ISelLowering.cpp.
On 7/21/2017 10:17 AM, hameeza ahmed via llvm-dev wrote:
> Thank you.
> I want to define a flag -optt-enabled in llc so i wrote following line
> in llc.cpp:
> static cl::opt<bool>
> OPPT("oppt-enabled", cl::desc("Enables Optimization"), cl::init(false));
> Now i want to check its value in x86isellwering.cpp
> there i wrote:
> if (OPPT)
> but getting the error
> use of undeclared identifier 'OPPT'
> Could someone tell me where i am mistaken? what else do i need to define.
> On Fri, Jul 21, 2017 at 2:33 PM, Diana Picus <diana.picus at linaro.org
> <mailto:diana.picus at linaro.org>> wrote:
> You can find plenty of examples (including in the vectorizer) if you
> grep for cl::opt.
> The docs are here:
> Hope that helps,
> On 21 July 2017 at 10:47, hameeza ahmed via llvm-dev
> <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> > Hello.
> > I need to introduce a new flag in llc command like llc -mV to
> control the
> > vectorization. How can I achieve this??
> > Please help.
> > Thank You
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