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Compilers and Libraries forum why SASX,SSAX,SADD16,SADD are not supported in ARMv8?

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why SASX,SSAX,SADD16,SADD are not supported in ARMv8?

ranjithkumar ds over 10 years ago

Hi, actually i need to do the conversion of 32-bit into 64-bit while doing that i came to know that many of the instructions that supports in ARMv7 not supporting in ARMv8 example: RSB, SASX, SSAX, SADD16, SADD what is the alternative instructions in ARMv8?

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daith over 10 years ago +1 verified

A pity about RSB. You can negate easily using r31 as in SUB w1,wzr,w1 but 7-i requires two instructions (unless you want to be excessively tricky and do i eor 7 for i in 0 to 7) The arithmetic operations...