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authorOlaf Hering <olh@suse.de>2006-04-11 20:42:08 +0200
committerPaul Mackerras <paulus@samba.org>2006-04-13 09:38:33 -0700
commitf48b8296b3152bb45c07c544ce072eaa59dfbc7c (patch)
tree88bf0d940d1343e12c927c6a6c0158933dd31f4b /arch/powerpc/Makefile
parentb055a9e10fd05c7fdd87904a50c1f413aea10ec4 (diff)
[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/powerpc/Makefile')
-rw-r--r--arch/powerpc/Makefile4
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