1 # SPDX-License-Identifier: GPL-2.0
2 # CPU tuning section - shared with UML.
3 # Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML.
5 tune = $(call cc-option,-mtune=$(1),$(2))
7 cflags-$(CONFIG_M486SX) += -march=i486
8 cflags-$(CONFIG_M486) += -march=i486
9 cflags-$(CONFIG_M586) += -march=i586
10 cflags-$(CONFIG_M586TSC) += -march=i586
11 cflags-$(CONFIG_M586MMX) += -march=pentium-mmx
12 cflags-$(CONFIG_M686) += -march=i686
13 cflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call tune,pentium2)
14 cflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call tune,pentium3)
15 cflags-$(CONFIG_MPENTIUMM) += -march=i686 $(call tune,pentium3)
16 cflags-$(CONFIG_MPENTIUM4) += -march=i686 $(call tune,pentium4)
17 cflags-$(CONFIG_MK6) += -march=k6
18 # Please note, that patches that add -march=athlon-xp and friends are pointless.
19 # They make zero difference whatsosever to performance at this time.
20 cflags-$(CONFIG_MK7) += -march=athlon
21 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon)
22 cflags-$(CONFIG_MCRUSOE) += -march=i686 -falign-functions=0 -falign-jumps=0 -falign-loops=0
23 cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) -falign-functions=0 -falign-jumps=0 -falign-loops=0
24 cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586)
25 cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586)
26 cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) -falign-functions=0 -falign-jumps=0 -falign-loops=0
27 cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686)
28 cflags-$(CONFIG_MVIAC7) += -march=i686
29 cflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2)
30 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom,$(call cc-option,-march=core2,-march=i686)) \
31 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
34 cflags-$(CONFIG_MELAN) += -march=i486
37 cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx
38 cflags-$(CONFIG_MGEODE_LX) += $(call cc-option,-march=geode,-march=pentium-mmx)
39 # add at the end to overwrite eventual tuning options from earlier
41 cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686))
43 # Bug fix for binutils: this option is required in order to keep
44 # binutils from generating NOPL instructions against our will.
45 ifneq ($(CONFIG_X86_P6_NOP),y)
46 cflags-y += $(call cc-option,-Wa$(comma)-mtune=generic32,)