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 5tune = $(call cc-option,-mtune=$(1),$(2)) 6 7ifdef CONFIG_CC_IS_CLANG 8align := -falign-functions=0 $(call cc-option,-falign-jumps=0) $(call cc-option,-falign-loops=0) 9else 10align := -falign-functions=0 -falign-jumps=0 -falign-loops=0 11endif 12 13cflags-$(CONFIG_M586) += -march=i586 14cflags-$(CONFIG_M586TSC) += -march=i586 15cflags-$(CONFIG_M586MMX) += -march=pentium-mmx 16cflags-$(CONFIG_M686) += -march=i686 17cflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call tune,pentium2) 18cflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call tune,pentium3) 19cflags-$(CONFIG_MPENTIUMM) += -march=i686 $(call tune,pentium3) 20cflags-$(CONFIG_MPENTIUM4) += -march=i686 $(call tune,pentium4) 21cflags-$(CONFIG_MK6) += -march=k6 22# Please note, that patches that add -march=athlon-xp and friends are pointless. 23# They make zero difference whatsosever to performance at this time. 24cflags-$(CONFIG_MK7) += -march=athlon 25cflags-$(CONFIG_MCRUSOE) += -march=i686 $(align) 26cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) $(align) 27cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586) 28cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586) 29cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) $(align) 30cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686) 31cflags-$(CONFIG_MVIAC7) += -march=i686 32cflags-$(CONFIG_MATOM) += -march=atom 33 34# AMD Elan support 35cflags-$(CONFIG_MELAN) += -march=i486 36 37# Geode GX1 support 38cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx 39cflags-$(CONFIG_MGEODE_LX) += $(call cc-option,-march=geode,-march=pentium-mmx) 40# add at the end to overwrite eventual tuning options from earlier 41# cpu entries 42cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686)) 43