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. 4 5 tune = $(call cc-option,-mtune=$(1),$(2)) 6 7 ifdef CONFIG_CC_IS_CLANG 8 align := -falign-functions=0 $(call cc-option,-falign-jumps=0) $(call cc-option,-falign-loops=0) 9 else 10 align := -falign-functions=0 -falign-jumps=0 -falign-loops=0 11 endif 12 13 cflags-$(CONFIG_M486SX) += -march=i486 14 cflags-$(CONFIG_M486) += -march=i486 15 cflags-$(CONFIG_M586) += -march=i586 16 cflags-$(CONFIG_M586TSC) += -march=i586 17 cflags-$(CONFIG_M586MMX) += -march=pentium-mmx 18 cflags-$(CONFIG_M686) += -march=i686 19 cflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call tune,pentium2) 20 cflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call tune,pentium3) 21 cflags-$(CONFIG_MPENTIUMM) += -march=i686 $(call tune,pentium3) 22 cflags-$(CONFIG_MPENTIUM4) += -march=i686 $(call tune,pentium4) 23 cflags-$(CONFIG_MK6) += -march=k6 24 # Please note, that patches that add -march=athlon-xp and friends are pointless. 25 # They make zero difference whatsosever to performance at this time. 26 cflags-$(CONFIG_MK7) += -march=athlon 27 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon) 28 cflags-$(CONFIG_MCRUSOE) += -march=i686 $(align) 29 cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) $(align) 30 cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586) 31 cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586) 32 cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) $(align) 33 cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686) 34 cflags-$(CONFIG_MVIAC7) += -march=i686 35 cflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2) 36 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom,$(call cc-option,-march=core2,-march=i686)) \ 37 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) 38 39 # AMD Elan support 40 cflags-$(CONFIG_MELAN) += -march=i486 41 42 # Geode GX1 support 43 cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx 44 cflags-$(CONFIG_MGEODE_LX) += $(call cc-option,-march=geode,-march=pentium-mmx) 45 # add at the end to overwrite eventual tuning options from earlier 46 # cpu entries 47 cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686)) 48 49 # Bug fix for binutils: this option is required in order to keep 50 # binutils from generating NOPL instructions against our will. 51 ifneq ($(CONFIG_X86_P6_NOP),y) 52 cflags-y += $(call cc-option,-Wa$(comma)-mtune=generic32,) 53 endif
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