Re: PA problem

[Jeffrey A Law <law at redhat dot com>]

 In message <200102281706.RAA05092@cam-mail2.cambridge.arm.com>you write:
  > Of course, the other alternative is to disable the splitter until after 
  > reload has completed.  I'm not sure which will lead to the best code.
But we want to schedule those instructions independently.

Basically what we've done is take something like this

t1 = a * b;
t2 = t1 + c

And turns it into

t1 = a * b;
t2 = a * b + c

Note how t2 is no longer dependent on t1.  That allows the instructions to
execute and retire independently of each other which gives the scheduler
more freedom in their placement in the insn stream.


jeff