Application Program Status Register

The Application Program Status Register (APSR) holds copies of the Arithmetic Logic Unit (ALU) status flags. They are also known as the condition code flags. They are used to determine whether conditional instructions are executed or not.

On ARMv5TE, ARMv6 and later architectures, the APSR also holds the Q (saturation) flag.

On ARMv6 and later, the APSR also holds the GE (Greater than or Equal) flags. The GE flags can be set by the parallel add and subtract instructions. The GE flags are used by the SEL instruction to perform byte-based selection from two registers.

These flags are accessible in all modes, using MSR and MRS instructions.

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