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Program Counter update

Note: This was originally posted on 15th June 2009 at http://forums.arm.com

In the Architectural Reference Manual for ARMv7 the PC update is described such that it gets update with adding 8 to the current PC while executing an ARM instruction and adding 4 for Thumb instruction. ARM instructions are 32-bit, hence I'd expect the PC to be updated by adding 4 to it rather than 8. Does anyone knows what is the reason behind this? Am I missing something or is it a mistake?

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Maya Maya over 12 years ago

Note: This was originally posted on 16th June 2009 at http://forums.arm.com

If that's the case, one would expect seeing PC + 6 due to having 16 and 32 bit Thumb instructions. Would that also be possible? How come that's not mentioned?
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Maya Maya over 12 years ago

Note: This was originally posted on 16th June 2009 at http://forums.arm.com

If that's the case, one would expect seeing PC + 6 due to having 16 and 32 bit Thumb instructions. Would that also be possible? How come that's not mentioned?
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