This is the mail archive of the
gcc-help@gcc.gnu.org
mailing list for the GCC project.
Help with GCC
- From: "Balaji V. Iyer" <bviyer at ncsu dot edu>
- To: gcc at gcc dot gnu dot org, gcc-help at gcc dot gnu dot org
- Date: Tue, 16 Aug 2005 02:37:58 -0400 (EDT)
- Subject: Help with GCC
Hello Everyone,
Greetings! I apologize ahead for asking an non-specific question. I
have a question about the liveness analysis. This is what I wanted to
do.
I want to check to see if an instruction is live after a certain number of
stage. (eg. 3 cycles)
if (INSN is not live for more than 3 cycles)
Mark it as "not_live" (NOT the same place as dead code marking)
else
Mark it as "live"
Pass this "live/not-live" flag to the register allocation process so that
it can output instruction in such a way (please see example below) (I want
this information to be passed into .md stage)
if (live)
print "add.live r1,r2,r3"
else
print "add.notlive r1,r2,r3"
I would also like to do it on the OpenRISC processor. Also, would like to
NOT change the GCC sources as much as I can.
I would appreciate if anyone could point me in the right direction to go
about doing this.
Thanking You,
Yours Sincerely,
Balaji V. Iyer.
PS. CC's greatly appreciated.