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Re: Tremendous increase in compile times for 3.4.1 with -mcpu=G5
- From: David Edelsohn <dje at watson dot ibm dot com>
- To: Bradley Lucier <lucier at math dot purdue dot edu>
- Cc: Michael Matz <matz at suse dot de>, Dale Johannesen <dalej at apple dot com>, Matt Austern <austern at apple dot com>, gcc at gcc dot gnu dot org
- Date: Sat, 14 Aug 2004 16:32:12 -0400
- Subject: Re: Tremendous increase in compile times for 3.4.1 with -mcpu=G5
- References: <C7AB5C7A-EE24-11D8-8F7A-003065BA681E@math.purdue.edu>
>>>>> Bradley Lucier writes:
Brad> I've been trying to digest this. Is this a problem that gcc has with
Brad> 64-bit ppc architecture, i.e., one that will also show up on aix and
Brad> linux64?
-mcpu=G5 is not a pure 64-bit PowerPC mode, it is a mixed mode:
64-bit computation within a function, but 32-bit ABI. The conversion back
and forth at function boundaries causes the register allocator fits.
David