1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun# CPU tuning section - shared with UML. 3*4882a593Smuzhiyun# Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML. 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun#-mtune exists since gcc 3.4 6*4882a593SmuzhiyunHAS_MTUNE := $(call cc-option-yn, -mtune=i386) 7*4882a593Smuzhiyunifeq ($(HAS_MTUNE),y) 8*4882a593Smuzhiyuntune = $(call cc-option,-mtune=$(1),$(2)) 9*4882a593Smuzhiyunelse 10*4882a593Smuzhiyuntune = $(call cc-option,-mcpu=$(1),$(2)) 11*4882a593Smuzhiyunendif 12*4882a593Smuzhiyun 13*4882a593Smuzhiyuncflags-$(CONFIG_M486SX) += -march=i486 14*4882a593Smuzhiyuncflags-$(CONFIG_M486) += -march=i486 15*4882a593Smuzhiyuncflags-$(CONFIG_M586) += -march=i586 16*4882a593Smuzhiyuncflags-$(CONFIG_M586TSC) += -march=i586 17*4882a593Smuzhiyuncflags-$(CONFIG_M586MMX) += -march=pentium-mmx 18*4882a593Smuzhiyuncflags-$(CONFIG_M686) += -march=i686 19*4882a593Smuzhiyuncflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call tune,pentium2) 20*4882a593Smuzhiyuncflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call tune,pentium3) 21*4882a593Smuzhiyuncflags-$(CONFIG_MPENTIUMM) += -march=i686 $(call tune,pentium3) 22*4882a593Smuzhiyuncflags-$(CONFIG_MPENTIUM4) += -march=i686 $(call tune,pentium4) 23*4882a593Smuzhiyuncflags-$(CONFIG_MK6) += -march=k6 24*4882a593Smuzhiyun# Please note, that patches that add -march=athlon-xp and friends are pointless. 25*4882a593Smuzhiyun# They make zero difference whatsosever to performance at this time. 26*4882a593Smuzhiyuncflags-$(CONFIG_MK7) += -march=athlon 27*4882a593Smuzhiyuncflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon) 28*4882a593Smuzhiyuncflags-$(CONFIG_MCRUSOE) += -march=i686 -falign-functions=0 -falign-jumps=0 -falign-loops=0 29*4882a593Smuzhiyuncflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) -falign-functions=0 -falign-jumps=0 -falign-loops=0 30*4882a593Smuzhiyuncflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586) 31*4882a593Smuzhiyuncflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586) 32*4882a593Smuzhiyuncflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) -falign-functions=0 -falign-jumps=0 -falign-loops=0 33*4882a593Smuzhiyuncflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686) 34*4882a593Smuzhiyuncflags-$(CONFIG_MVIAC7) += -march=i686 35*4882a593Smuzhiyuncflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2) 36*4882a593Smuzhiyuncflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom,$(call cc-option,-march=core2,-march=i686)) \ 37*4882a593Smuzhiyun $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun# AMD Elan support 40*4882a593Smuzhiyuncflags-$(CONFIG_MELAN) += -march=i486 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun# Geode GX1 support 43*4882a593Smuzhiyuncflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx 44*4882a593Smuzhiyuncflags-$(CONFIG_MGEODE_LX) += $(call cc-option,-march=geode,-march=pentium-mmx) 45*4882a593Smuzhiyun# add at the end to overwrite eventual tuning options from earlier 46*4882a593Smuzhiyun# cpu entries 47*4882a593Smuzhiyuncflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686)) 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun# Bug fix for binutils: this option is required in order to keep 50*4882a593Smuzhiyun# binutils from generating NOPL instructions against our will. 51*4882a593Smuzhiyunifneq ($(CONFIG_X86_P6_NOP),y) 52*4882a593Smuzhiyuncflags-y += $(call cc-option,-Wa$(comma)-mtune=generic32,) 53*4882a593Smuzhiyunendif 54