[llvm-dev] Immediate value boundary checking

[Sky Flyer via llvm-dev]

Dear all,

I have written an assembler which reads assembly instructions and produces
the equivalent binary. I have a problem. Although I set the bit range and
immediate type for an instruction like add which accepts a register and an
immediate value, I can simply overflow that value and llvm/tablegen doesn't
care!

for example for a i8imm imm value (bits<8> val) these two produce the same
output:

add r0 0
add r0 256

whose responsibility is to check the integer boundary in the assembly
parser?

Cheers,
ES
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