Assn 2 Part 1

[Sam]

SFU ID: 301404717

Github username:ahmadsami07

Github: Link to github repo (your assignment repos are private so these links are only accessible to TAs and Instructor): https://github.com/CMPT-295-SFU/assignment-2-ahmadsami07

Line and file: utils.c, 161

Expected behavior:00001000: jal    x19, 0
00001004: jal    x20, 1
00001008: jal    x3, 0
0000100c: jal    x1, 0...etc

Observed behavior:jal x19,4 etc

Question:I'm stuck on the jump offset for jal quite a while now and am not being able to figure it out. I changed my masking process and believe it to be correct but my output is not coming like it should on the ref. A clue to where I'm going wrong would be really appreciated as I'm stuck on this quite a while now and not being able to go to part 2.

[Arrvindh Shriraman]

It appears to me your confusing where exactly the bits are located.

test is already imm (it is not the entire instruction.......)

For instance if you want bits 10:1 you should NOT be right shifting by 11 bits line 168 there are only these fields to right off it (11|19:12). That is not 11 bits. 

- The other shifts and masks are also off, but you may not notice it in this test as the offset is just 0. 

- But all of it stems from the fact that you seem to have written the code assuming test is storing the entire instruction; not just imm.

Further remember that is bits 10:1 not the 0th bit. The offset does not need to store the 0th bit. Think why.

[Sam]

Thank you so much for your detailed reply,I got it correct now.