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SubjectRe: Using %cr2 to reference "current"
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> With the following options enabled we get:
> -freg-struct-return -mrtd -mregparm=3
>
> text data bss dec hex filename
> 1302372 260804 288080 1851256 1c3f78 vmlinux
>
> Quite significant difference if you ask me!!!

30K is nice have but still a scratch on the surface compared with 500K 8)

> in a saving of about 2.3% in code size. This may not sound grat in
> relative
> numbers, but for a compiler designer this would already sound hilarious
> and in
> absolute numbers it's: 29760 bytes. Not withstanding the speed
> improvement...

The obvious question is - have you tried running the kernel built like that
with any asm fixups needed ?
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