The condition flags and Condition code suffixes （arm）

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本文深入探讨了ARM处理器中的操作状态寄存器（APSR），包括其功能、标志位（如N、Z、C、V等）以及它们如何用于表示运算结果的状态。同时介绍了条件码后缀在指令中的应用，以实现基于运算结果的不同行为。

Set to 1 when the result of the operation was negative, cleared to 0 otherwise.

Set to 1 when the result of the operation was zero, cleared to 0 otherwise.

Set to 1 when the operation resulted in a carry, cleared to 0 otherwise.

Set to 1 when the operation caused overflow, cleared to 0 otherwise.

For more information about the APSR see Program Status Register.

Condition code suffixes

Suffix	Flags	Meaning
`EQ`	Z = 1	Equal
`NE`	Z = 0	Not equal
`CS or HS`	C = 1	Higher or same, unsigned
`CC or LO`	C = 0	Lower, unsigned
`MI`	N = 1	Negative
`PL`	N = 0	Positive or zero
`VS`	V = 1	Overflow
`VC`	V = 0	No overflow
`HI`	C = 1 and Z = 0	Higher, unsigned
`LS`	C = 0 or Z = 1	Lower or same, unsigned
`GE`	N = V	Greater than or equal, signed
`LT`	N != V	Less than, signed
`GT`	Z = 0 and N = V	Greater than, signed
`LE`	Z = 1 and N != V	Less than or equal, signed
`AL`	Can have any value	Always. This is the default when no suffix is specified.