summaryrefslogtreecommitdiff
path: root/target/linux/generic/patches-2.6.37/012-extra_optimization.patch
blob: 4ffa26e9eba166a5ad3a891bc147ec1154be9ae3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
--- a/Makefile
+++ b/Makefile
@@ -538,9 +538,9 @@
 all: vmlinux
 
 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-KBUILD_CFLAGS	+= -Os
+KBUILD_CFLAGS	+= -Os -fno-caller-saves
 else
-KBUILD_CFLAGS	+= -O2
+KBUILD_CFLAGS	+= -O2 -fno-reorder-blocks -fno-tree-ch -fno-caller-saves
 endif
 
 include $(srctree)/arch/$(SRCARCH)/Makefile
@@ -595,6 +595,9 @@
 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 
+# improve gcc optimization
+CFLAGS += $(call cc-option,-funit-at-a-time,)
+
 # warn about C99 declaration after statement
 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)