Re: [PATCH] common implementation of iterative div/mod

From: Jeremy Fitzhardinge
Date: Wed May 14 2008 - 06:52:47 EST


Andi Kleen wrote:
Jeremy Fitzhardinge wrote:
Andi Kleen wrote:
You would need to annotate it and have a separate object file for the
different sections. Also it would need to be compiled PIC.

Inlining is better.
BTW, I'm seeing the memcpy() in __vdso_gettimeofday() not being inlined.

Hmm works here. What compiler do you use? Normally gcc should recognize the memcpy is just two constant stores and always inline even with -Os.

It's:
jeremy@cosworth:~/hg/xen/paravirt/linux-x86_64$ gcc -v
Reading specs from /usr/lib/gcc/x86_64-linux/3.4.4/specs
Configured with: ../src/configure -v --enable-languages=c,c++,java,f77,pascal,objc,ada,treelang --prefix=/usr --libexecdir=/usr/lib --with-gxx-include-dir=/usr/include/c++/3.4 --enable-shared --with-system-zlib --enable-nls --without-included-gettext --program-suffix=-3.4 --enable-__cxa_atexit --enable-libstdcxx-allocator=mt --enable-clocale=gnu --enable-libstdcxx-debug --enable-java-gc=boehm --enable-java-awt=gtk --disable-werror x86_64-linux
Thread model: posix
gcc version 3.4.4 20050314 (prerelease) (Debian 3.4.3-13)

I think this is still a supported compiler, isn't it?

J
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/