I've got most of the bits of the IADD3 instruction figured out, there's still a couple things I don't know and can't find an answer to.

here's some output from cuobjdump (reformatted to take less horizontal space)

IADD3 R4, P0, R4, R4, RZ ;                    // 0x0000000404047210
                                              // 0x003fde0007f1e0ff
IADD3.X R5, P3, P6, R5, R5, RZ, P0, P5  ?PM3; // 0x0000000505057210
                                              // 0x003fdec00066a4ff
// I edited the bits of the IADD3.X instruction to see how the assembly changes
// I don't know if the ?PM3 would actually do anything or appear in normal code
// also I don't know if the second predicate input/output are actually used
// a more detailed breakdown of the above is below in the commented dump from DocumentSASS

here's a helpful graphic to reference for the following from this pdf: ![ampere_encoding.png](https://asset

the default control bits output by ptxas on some random ptx I made seem to be 0x003fde (why I think this is default is in the table below):

| field               | #bits | val | why I think this is default |
| --------------------------------------------------------------- |
| reuse               |   4   |  0  | can still reuse regs, we just dont give the hint to the processor that we ARE reusing it |
| wait barrier mask   |   6   |  3  | probably could also be 0 since the barriers for all prev instructions are 7 aka unset) |
| read barrier index  |   3   |  7  | unset/not making a barrier  |
| write barrier index |   3   |  7  | unset/not making a barrier  |
| yield flag          |   1   |  0  | dont yield (in combination with a high stall this seems to kinda say "take as long as it takes")
| stall cycles        |   4   |  F  | take as long as it takes    |

most helpful graphic I've found for understanding the encoding from [this pdf](https://www.cse.ust.hk/~weiwa

First post for this project - I'll just dump some links that I've found helpful for learning about the Ampere architecture and instruction encoding

• website with SM90a ISA
• SASS control code viewer
• SASS control code explanation
• Turning/Ampere assembler
• Volta architecture pdf
• Ampere architecture pdf
• Ampere architecture talk
• [above talk slides pdf (no signin required) ]( https://cfvod.kaltura.com/api_v3/index.php/service/attachment_attachmentAsset/action/serve/attachmentAssetId/1_ezjj6bp9/ks/djJ8MjkzNTc3MXzsRYu5cyOvZOPrEK0zuiSWMgkhZRcJ8ZojnzQVpbbToju32