Re: gcc 4.3 generates less efficient code than gcc 4.1 or 4.2

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Hi Eljay,

On 2008-07-03 08:44:38 -0500, Eljay Love-Jensen wrote:
> > A problem is that I generally don't compile/install gcc myself.
> > I thought "gcc -v" would give it, but this is not the case.
> 
> Does this allow you to see it...?
> 
> touch info.c
> gcc -S -fverbose-asm info.c -o info.s
> cat info.s

I get the -mtune value, but not the -march one. Is it necessarily
the same one?

BTW, to avoid temporary files:

  gcc -S -fverbose-asm -xc /dev/null -o /dev/stdout

> > One may guess it from the given configure option and gcc version,
> > but wouldn't it be a useful to have it from "gcc -v"?
> 
> Agreed!

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36731

-- 
Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <http://www.vinc17.org/>
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Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)

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