모두의 코드
FABS (Intel x86/64 assembly instruction)
FABS
Absolute Value
참고 사항
아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.
Opcode | Instruction | 64-Bit | Compat/ | Description |
|---|---|---|---|---|
D9 E1 | Valid | Valid | Replace ST with its absolute value. |
Description
Clears the sign bit of ST(0) to create the absolute value of the operand. The following table shows the results obtained when creating the absolute value of various classes of numbers.
Table 3-17. Results Obtained from FABS
ST(0) SRC | ST(0) DEST |
|---|---|
- $\infty$ | + $\infty$ |
- F | + F |
- 0 | + 0 |
+ 0 | + 0 |
+ F | + F |
+ $\infty$ | + $\infty$ |
NaN | NaN |
NOTES:
F Means finite floating-point value.
This instruction's operation is the same in non-64-bit modes and 64-bit mode.
Operation
ST(0) <- |ST(0)|;
FPU Flags Affected
C1 Set to 0.
C0, C2, C3 Undefined.
Floating-Point Exceptions
#IS Stack underflow occurred.
Protected Mode Exceptions
#NM
CR0.EM[bit 2] or CR0.TS[bit 3] = 1.
#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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