Instruction format in documentation ARM-v7-A

Hi. This is the first time to ask questions in this forum. Hope this is the right place to reach you and get help. I refer to the documentation ARMv7-A and ARMv7-R edition I don't understand the brackets...
Instruction format in documentation ARM-v7-A

Hi. This is the first time to ask questions in this forum. Hope this is the right place to reach you and get help. I refer to the documentation ARMv7-A and ARMv7-R edition I don't understand the brackets...
Strange behavior of the "smmls" instruction

I try to optimize my code by substituting a pair of smull and sub instructions with one smmls instruction, but the smmls gives the wrong result! This is the test case: mov32 r1, #0x8000d286 mov32...
Strange behavior of the "smmls" instruction

I try to optimize my code by substituting a pair of smull and sub instructions with one smmls instruction, but the smmls gives the wrong result! This is the test case: mov32 r1, #0x8000d286 mov32...
Which instruction format does Cortex-R support,encoding A1 orA2?

I see it support encoding T2 for Thumb-2 instruction set.But which instruction format does Cortex-R support for ARM instruction,encoding A1 orA2?