모두의 코드
FDECSTP (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 633 번 읽혔습니다.

FDECSTP

Decrement Stack-Top Pointer

참고 사항

아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.

Opcode

Instruction

64-Bit
Mode

Compat/
Leg Mode

Description

D9 F6

FDECSTP

Valid

Valid

Decrement TOP field in FPU status word.

Description

Subtracts one from the TOP field of the FPU status word (decrements the top-of-stack pointer). If the TOP field contains a 0, it is set to 7. The effect of this instruction is to rotate the stack by one position. The contents of the FPU data registers and tag register are not affected.

This instruction's operation is the same in non-64-bit modes and 64-bit mode.

Operation

IF TOP = 0
    THEN TOP <- 7;
    ELSE TOP <- TOP - 1;
FI;

FPU Flags Affected

The C1 flag is set to 0. The C0, C2, and C3 flags are 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.

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