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2015 Apr 28
2
[LLVMdev] Lowering intrinsic that return an int1
Hi all,
I'm playing with intrinsics and I was wondering how to lower an
intrinsic that should return, for example, an int1? More precisely, how
to return the value when working with MachineInst?
First, I have defined an instrinsic in "Intrinsics.td":
_def int_antivm : Intrinsic<[llvm_i1_ty], [], [], "llvm.antivm">;_
Then I want to lower it in the X86 backend,
2015 Apr 28
2
[LLVMdev] Lowering intrinsic that return an int1
...e-all, you should be able to see the actual sequence.
That's exactly my problem. How to know before my custom inserter where
the produced value will be? I found some documentation about the x86
target saying that the operand 0 is always the destination value, is it
right? Also, sometimes I saw _getOperand(0).getReg()_, but how can I be
sure that the destination will be in a vreg? Should I specify it
explicitly in the TableGen definition?
I admit being a bit lost inside the backend...
Thank you for your help
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