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mips: use -mno-branch-likely for kernel and userspace, saves ~11k kernel size after lzma and ~12k squashfs size in the default configuration 

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34909 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
Felix Fietkau 2012-12-28 19:17:19 +00:00
parent 7bd61ec3c9
commit c28528a913
7 changed files with 27 additions and 5 deletions
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2
include/target.mk
View File

@ -193,7 +193,7 @@ ifeq ($(DUMP),1)
DEFAULT_CFLAGS_i386=-O2 -pipe -march=i486 -fno-caller-saves
DEFAULT_CFLAGS_x86_64=-O2 -pipe -march=athlon64 -fno-caller-saves
DEFAULT_CFLAGS_m68k=-Os -pipe -mcfv4e -fno-caller-saves
DEFAULT_CFLAGS_mips=-Os -pipe -mips32 -mtune=mips32 -fno-caller-saves
DEFAULT_CFLAGS_mips=-Os -pipe -mips32 -mtune=mips32 -fno-caller-saves -mno-branch-likely
DEFAULT_CFLAGS_mipsel=$(DEFAULT_CFLAGS_mips)
DEFAULT_CFLAGS_mips64=-Os -pipe -mips64 -mtune=mips64 -mabi=64 -fno-caller-saves
DEFAULT_CFLAGS_mips64el=$(DEFAULT_CFLAGS_mips64)

2
target/linux/ar71xx/Makefile
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@ -10,7 +10,7 @@ ARCH:=mips
BOARD:=ar71xx
BOARDNAME:=Atheros AR7xxx/AR9xxx
FEATURES:=squashfs jffs2 targz
CFLAGS:=-Os -pipe -mips32r2 -mtune=mips32r2 -fno-caller-saves
CFLAGS:=-Os -pipe -mips32r2 -mtune=mips32r2 -fno-caller-saves -mno-branch-likely
SUBTARGETS:=generic nand
LINUX_VERSION:=3.6.11

11
target/linux/generic/patches-3.6/302-mips_no_branch_likely.patch Normal file
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@ -0,0 +1,11 @@
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -87,7 +87,7 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
# machines may also. Since BFD is incredibly buggy with respect to
# crossformat linking we rely on the elf2ecoff tool for format conversion.
#
-cflags-y += -G 0 -mno-abicalls -fno-pic -pipe
+cflags-y += -G 0 -mno-abicalls -fno-pic -pipe -mno-branch-likely
cflags-y += -msoft-float
LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
KBUILD_AFLAGS_MODULE += -mlong-calls

2
target/linux/generic/patches-3.6/305-mips_module_reloc.patch
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@ -1,7 +1,7 @@
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -90,8 +90,8 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
cflags-y += -G 0 -mno-abicalls -fno-pic -pipe
cflags-y += -G 0 -mno-abicalls -fno-pic -pipe -mno-branch-likely
cflags-y += -msoft-float
LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
-KBUILD_AFLAGS_MODULE += -mlong-calls

11
target/linux/generic/patches-3.7/302-mips_no_branch_likely.patch Normal file
View File

@ -0,0 +1,11 @@
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -87,7 +87,7 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
# machines may also. Since BFD is incredibly buggy with respect to
# crossformat linking we rely on the elf2ecoff tool for format conversion.
#
-cflags-y += -G 0 -mno-abicalls -fno-pic -pipe
+cflags-y += -G 0 -mno-abicalls -fno-pic -pipe -mno-branch-likely
cflags-y += -msoft-float
LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
KBUILD_AFLAGS_MODULE += -mlong-calls

2
target/linux/lantiq/Makefile
View File

@ -13,7 +13,7 @@ SUBTARGETS=xway ase falcon
LINUX_VERSION:=3.7.1
CFLAGS=-Os -pipe -mips32r2 -mtune=mips32r2 -fno-caller-saves
CFLAGS=-Os -pipe -mips32r2 -mtune=mips32r2 -fno-caller-saves -mno-branch-likely
define Target/Description
Build firmware images for Lantiq SoC

2
target/linux/ramips/Makefile
View File

@ -10,7 +10,7 @@ ARCH:=mipsel
BOARD:=ramips
BOARDNAME:=Ralink RT288x/RT3xxx
SUBTARGETS:=rt288x rt305x rt3883
CFLAGS:=-Os -pipe -mips32r2 -mtune=mips32r2 -fno-caller-saves
CFLAGS:=-Os -pipe -mips32r2 -mtune=mips32r2 -fno-caller-saves -mno-branch-likely
FEATURES:=squashfs
LINUX_VERSION:=3.6.11