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TGC-Hammer/reprod/16_custom_register_read.core_desc

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// Custom registers can be read only once (also for custom register fields)
InstructionSet Zbb {
architectural_state {
unsigned int XLEN=32;
const register unsigned<32> XLEN_R = 32;
register unsigned<XLEN> X[32] [[is_main_reg]];
register unsigned<8> LFSR;
}
instructions {
TEST {
encoding: 12'b011000000000 :: rs1[4:0] :: 3'b001 :: rd[4:0] :: 7'b0010011;
assembly: "{name(rd)}, {name(rs1)}";
behavior: {
unsigned<8> a = LFSR;
unsigned<8> b = LFSR;
}
}
}
}