| commit | f48b8296b3152bb45c07c544ce072eaa59dfbc7c | |
| author | Olaf Hering <olh@suse.de> | |
| Tue, 11 Apr 2006 18:42:08 +0000 (11 20:42 +0200) | ||
| committer | Paul Mackerras <paulus@samba.org> | |
| Thu, 13 Apr 2006 16:38:33 +0000 (13 09:38 -0700) | ||
| tree | 88bf0d940d1343e12c927c6a6c0158933dd31f4b | treesnapshot (tar.gz zip) |
| parent | b055a9e10fd05c7fdd87904a50c1f413aea10ec4 | commitdiff |
[PATCH] powerpc32: Set cpu explicitly in kernel compiles
Compile the 32bit kernel with -mcpu=powerpc. This reduces the imagesize
when a compiler is used that defaults to -mtune=power4. It inserts lots
of nops to please the 64bit cpu instruction scheduling. But all these nops
are not needed for 32bit kernels.
Example with SLES10 gcc 4.1.0 and arch/powerpc/configs/pmac32_defconfig:
vmlinux vmlinux.strip vmlinux.gz
-O2 4980515 4187528 1846829
-Os 4618801 3827084 1673333
-O2 -mcpu=powerpc 4738851 3945868 1816253
-Os -mcpu=powerpc 4532785 3741068 1664688
Signed-off-by: Olaf Hering <olh@suse.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Compile the 32bit kernel with -mcpu=powerpc. This reduces the imagesize
when a compiler is used that defaults to -mtune=power4. It inserts lots
of nops to please the 64bit cpu instruction scheduling. But all these nops
are not needed for 32bit kernels.
Example with SLES10 gcc 4.1.0 and arch/powerpc/configs/pmac32_defconfig:
vmlinux vmlinux.strip vmlinux.gz
-O2 4980515 4187528 1846829
-Os 4618801 3827084 1673333
-O2 -mcpu=powerpc 4738851 3945868 1816253
-Os -mcpu=powerpc 4532785 3741068 1664688
Signed-off-by: Olaf Hering <olh@suse.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
| arch/powerpc/Makefile | diffblobblamehistory |