[llvm-dev] In ISel, where Constant<0> comes from?

Krzysztof Parzyszek via llvm-dev llvm-dev at lists.llvm.org
Mon Dec 17 06:45:47 PST 2018

On 12/17/2018 8:08 AM, Gleb Popov via llvm-dev wrote:
> In the Initial selection DAG I see
> t19: ch,glue = CopyToReg t17, Register:i32 $i0, Constant:i32<0>

To answer this---this seems to be a part of the return sequence, i.e. 
the part of the calling convention that dictates how a function passes 
return values to its caller. This is handled via LowerReturn in the 
target lowering object. Check SparcTargetLowering::LowerReturn for the 
Sparc implementation.


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