bge
Branch if greater than or equal
Branch to PC + imm if the signed value in register xs1 is greater than or equal to the signed value in register xs2.
Raise a MisalignedAddress exception if PC + imm is misaligned.
Decode Variables
Bits<13> imm = {$encoding[31], $encoding[7], $encoding[30:25], $encoding[11:8], 1'd0};
Bits<5> xs2 = $encoding[24:20];
Bits<5> xs1 = $encoding[19:15];Execution
-
IDL
-
Sail
XReg lhs = X[xs1];
XReg rhs = X[xs2];
if ($signed(lhs) >= $signed(rhs)) {
jump_halfword($pc + $signed(imm));
}{
let xs1_val = X(xs1);
let xs2_val = X(xs2);
let taken : bool = match op {
RISCV_BEQ => xs1_val == xs2_val,
RISCV_BNE => xs1_val != xs2_val,
RISCV_BLT => xs1_val <_s xs2_val,
RISCV_BGE => xs1_val >=_s xs2_val,
RISCV_BLTU => xs1_val <_u xs2_val,
RISCV_BGEU => xs1_val >=_u xs2_val
};
let t : xlenbits = PC + sign_extend(imm);
if taken then {
/* Extensions get the first checks on the prospective target address. */
match ext_control_check_pc(t) {
Ext_ControlAddr_Error(e) => {
ext_handle_control_check_error(e);
RETIRE_FAIL
},
Ext_ControlAddr_OK(target) => {
if bit_to_bool(target[1]) & not(extension("C")) then {
handle_mem_exception(target, E_Fetch_Addr_Align());
RETIRE_FAIL;
} else {
set_next_pc(target);
RETIRE_SUCCESS
}
}
}
} else RETIRE_SUCCESS
}