• C
    powerpc/Makefile: set -mcpu=860 flag for the 8xx · 1c389763
    Christophe Leroy 提交于
    When compiled with GCC 8.1, vmlinux is significantly bigger than
    with GCC 4.8.
    
    When looking at the generated code with objdump, we notice that
    all functions and loops when a 16 bytes alignment. This significantly
    increases the size of the kernel. It is pointless and even
    counterproductive as on the 8xx 'nop' also consumes one clock cycle.
    
    Size of vmlinux with GCC 4.8:
       text	   data	    bss	    dec	    hex	filename
    5801948	1626076	 457796	7885820	 7853fc	vmlinux
    
    Size of vmlinux with GCC 8.1:
       text	   data	    bss	    dec	    hex	filename
    6764592	1630652	 456476	8851720	 871108	vmlinux
    
    Size of vmlinux with GCC 8.1 and this patch:
       text	   data	    bss	    dec	    hex	filename
    6331544	1631756	 456476	8419776	 8079c0	vmlinux
    Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr>
    Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
    1c389763
Makefile 15.2 KB