BSL
Bitwise select
This instruction sets each bit in the destination SIMD&FP register
to the corresponding bit from the first source SIMD&FP register when
the original destination bit was 1, otherwise from the second source SIMD&FP register.
Depending on the settings in the CPACR_EL1,
CPTR_EL2, and CPTR_EL3 registers,
and the current Security state and Exception level,
an attempt to execute the instruction might be trapped.
If PSTATE.DIT is 1:
The execution time of this instruction is independent of:
The values of the data supplied in any of its registers.
The values of the NZCV flags.
The response of this instruction to asynchronous exceptions does not vary based on:
The values of the data supplied in any of its registers.
The values of the NZCV flags.
0
1
0
1
1
1
0
0
1
1
0
0
0
1
1
1
BSL <Vd>.<T>, <Vn>.<T>, <Vm>.<T>
constant integer d = UInt(Rd);
constant integer n = UInt(Rn);
constant integer m = UInt(Rm);
constant integer datasize = 64 << UInt(Q);
<Vd>
Is the name of the SIMD&FP destination register, encoded in the "Rd" field.
<T>
Is an arrangement specifier,
<Vn>
Is the name of the first SIMD&FP source register, encoded in the "Rn" field.
<Vm>
Is the name of the second SIMD&FP source register, encoded in the "Rm" field.
CheckFPAdvSIMDEnabled64();
constant bits(datasize) operand1 = V[m, datasize];
constant bits(datasize) operand2 = V[d, datasize];
constant bits(datasize) operand3 = V[n, datasize];
V[d, datasize] = operand1 EOR ((operand1 EOR operand3) AND operand2);