모두의 코드
FFREE (Intel x86/64 assembly instruction)
작성일 : 2020-09-01
이 글은 646 번 읽혔습니다.
FFREE
Free Floating-Point Register
참고 사항
아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.
Opcode | Instruction | 64-Bit | Compat/ | Description |
|---|---|---|---|---|
DD C0+i | FFREE ST(i) | Valid | Valid | Sets tag for ST(i) to empty. |
Description
Sets the tag in the FPU tag register associated with register ST(i) to empty (11B). The contents of ST(i) and the FPU stack-top pointer (TOP) are not affected.
This instruction's operation is the same in non-64-bit modes and 64-bit mode.
Operation
TAG(i) <- 11B;
FPU Flags Affected
C0, C1, C2, C3 undefined.
Floating-Point Exceptions
None
Protected Mode Exceptions
#NM
CR0.EM[bit 2] or CR0.TS[bit 3] = 1.
#MF
If there is a pending x87 FPU exception.
#UD
If the LOCK prefix is used.
Real-Address Mode Exceptions
Same exceptions as in protected mode.
Virtual-8086 Mode Exceptions
Same exceptions as in protected mode.
Compatibility Mode Exceptions
Same exceptions as in protected mode.
64-Bit Mode Exceptions
Same exceptions as in protected mode.
첫
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