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Fix BLTZAL/BGEZAL info

This commit is contained in:
wheremyfoodat 2022-08-29 04:11:35 +03:00
parent 72300d8f44
commit 9db9fafd62
1 changed files with 4 additions and 3 deletions
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7
docs/cpuspecifications.md
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@ -351,11 +351,12 @@ Note that the instruction following the branch will always be executed.<br/>
bgez rs,dest if rs>=0 then pc=$+4+(-8000h..+7FFFh)*4
bgtz rs,dest if rs>0 then pc=$+4+(-8000h..+7FFFh)*4
blez rs,dest if rs<=0 then pc=$+4+(-8000h..+7FFFh)*4
bltzal rs,dest if rs<0 then pc=$+4+(..)*4, ra=$+8
bgezal rs,dest if rs>=0 then pc=$+4+(..)*4, ra=$+8
bltzal rs,dest ra=$+8; if rs<0 then pc=$+4+(..)*4
bgezal rs,dest ra=$+8; if rs>=0 then pc=$+4+(..)*4
```
jr/jalr can be used to jump to an unaligned address, in which case an address error (AdEL) exception will be raised on the next instruction fetch.
jr/jalr can be used to jump to an unaligned address, in which case an address error (AdEL) exception will be raised on the next instruction fetch.<br/>
Additionally, bltzal/bgezal will always place the return address in $ra, whether or not the branch is taken<br/>
#### JALR cautions
Caution: The JALR source code syntax varies (IDT79R3041 specs say "jalr rs,rd",