x86settag
LBT intrinsic · group: x86 FPU
Synopsis
Instruction: x86settag rd, imm1, imm2
CPU Flags: LBT
Description
Set x87 tag word bit in rd according to imm1 and imm2. imm2 selects the target bit position. imm1%8 determines the operation: 0=set bit (0→1 only), 1=clear bit (1→0 only), 2-4=check tag byte then modify. Raises a BTE (Binary Translation Exception) on invalid state transitions.