On Thu, Apr 16, 2015 at 02:23:44PM -0700, H.J. Lu wrote: > GCC 5 added a compiler option, -mskip-rax-setup, for x86-64. It skips > setting up the RAX register when SSE is disabled and there are no > variable arguments passed in vector registers. Since kernel doesn't > pass vector registers to functions with variable arguments, this option > can be used to optimize the x86-64 kernel. For kernel 3.17: > > text data bss dec hex filename > 11455921 2204048 5853184 19513153 129bf41 vmlinux #with -mskip-rax-setup > 11480079 2204048 5853184 19537311 12a1d9f vmlinux
Patch looks good to me. Reviewed-by: Andi Kleen <[email protected]> -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
