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| author | Olaf Hering <olh@suse.de> | 2006-04-11 20:42:08 +0200 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-04-13 09:38:33 -0700 |
| commit | f48b8296b3152bb45c07c544ce072eaa59dfbc7c (patch) | |
| tree | 88bf0d940d1343e12c927c6a6c0158933dd31f4b /arch | |
| parent | b055a9e10fd05c7fdd87904a50c1f413aea10ec4 (diff) | |
| download | blackbird-op-linux-f48b8296b3152bb45c07c544ce072eaa59dfbc7c.tar.gz blackbird-op-linux-f48b8296b3152bb45c07c544ce072eaa59dfbc7c.zip | |
[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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 6ec84d37a337..ed5b26aa8be3 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -104,6 +104,10 @@ ifndef CONFIG_FSL_BOOKE CFLAGS += -mstring endif +ifeq ($(CONFIG_6xx),y) +CFLAGS += -mcpu=powerpc +endif + cpu-as-$(CONFIG_PPC64BRIDGE) += -Wa,-mppc64bridge cpu-as-$(CONFIG_4xx) += -Wa,-m405 cpu-as-$(CONFIG_6xx) += -Wa,-maltivec |
