Re: [Open64-devel] Callee save predicate registers.....

[Lu y. <ly...@ic...>]

Predicate registers are divided into "scratch" and "preserved" registers,
corresponding to
caller- and callee- save. Whether savind predicate registers in caller or in
callee is reasonable.


Thanks,
Yunzhao Lu
----- Original Message -----
From: "Chung-Lin Tang" <clt...@nc...>
To: <ope...@li...>
Sent: Saturday, June 05, 2004 6:37 PM
Subject: [Open64-devel] Callee save predicate registers.....




My understanding of the saving/restoring of the predicate registers is that,
the EETARG_[Save/Restore]_Extra_Callee_Tns routines (in
be/cg/ia64/entry_exit_targ.cxx) is
responsible; saving all predicate regs with a single OP is faster....

But that code path seems to only when the GRA is run....When only LRA
runs (like in -O0)
the LRA Spill/Restore code doesn't seem to do anything about the 'extra'
callee-save regs....
Why is it this way...?

My guess is that it was assumed that under all local TN mode, caller
save predicates will always
be enough, maybe only a single one to place the branch condition is
needed.....





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