[libre-riscv-dev] [Bug 305] Create Pipelined ALU similar to alu_hier.py

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Thu May 14 17:54:25 BST 2020


--- Comment #63 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Michael Nolan from comment #59)
> *headdesk*

move the keyboard to the left, first...

> cmp is BACKWARDS!


> (gdb) p/x $r1
> $1 = 0x40000000
> (gdb) p/x $r2
> $2 = 0x80000000

are ya having fun, yet?

> Why IBM, why did you do this?

hm i dunno... i mean... it could be justified if it's less code to check
+ve condition quicker than it is to check -ve condition or vice-versa.

then you would use sub for one and cmp for the other.

honestly: am clueless :)

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