Re: [PATCH] X86-32: Let gcc decide whether to inline memcpy was Re: New x86 warning

[H. Peter Anvin]

Joe Damato wrote:
> Looks like this thread is dead/dying, but figured I should reply with
> my test findings. The number of out-of-line calls (as determined by:
> make mrproper && make defconfig && make && objdump -d vmlinux | grep
> "call.*\<memset" | wc -l))
>
> gcc 4.2.4 - withOUT memset patch: 20
> gcc 4.2.4 - with memset patch: 365
>
> gcc 3.4 - withOUT memset patch: 17
> gcc 3.4 - with memset patch: 349
>
> I'm guessing this is probably not acceptable, so I won't bother
> installing/trying gcc-3.2 unless anyone thinks that a 300+ increase in
> out-of-line calls is OK.

Not unless it can be proven those calls are in non-performance-critical 
contexts.  That's a lot of work to go through, though.

	-hpa

--
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/