[PATCH] Set cpu explicitly in kernel compiles
kumar.gala at freescale.com
Wed May 4 23:45:51 EST 2005
On May 4, 2005, at 2:05 AM, Paul Mackerras wrote:
> What do people think of this patch? The motivation for it is that a
> biarch gcc-4.0 will by default tune for POWER4, even for a 32-bit
> compile, meaning that we end up with a lot of nops we don't need.
> This also takes out -mstring.
> With this, the text size reduces by about 120k for my normal config
> when compiling with a biarch gcc-4.0. The text size also reduces
> slightly when compiling with the Debian gcc-3.3.5 (32-bit only, not
What is attributed to this large of a text size change. I've always
assumed the -mcpu and -mtune options really only effected code
scheduling. This seems really odd since there arent really that many
different instructions between the various PPC variants.
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