[llvm-dev] A question about support RV32E in the riscv target

[Ben Shi via llvm-dev]

Hello,


Though the ABI / call-convention for rv32e has not be defined clear by the riscv organization. 


But besides that, is it possible to partial support it by adding target feature FeatureReserveX16---FeatureReserveX31 to the FeatureRV32E ?
Just like 
def FeatureStdExtD
    : SubtargetFeature<"d", "HasStdExtD", "true",
                       "'D' (Double-Precision Floating-Point)",
                       [FeatureStdExtF]>;


FeatureStdExtD implies FeatureStdExtF, we can make FeatureRV32E implies FeatureReserveX16---FeatureReserveX31 ? 


Is this a proper way to tell the register allocator do not use X16-X31 ?


Ben

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