linux/arch/x86/Makefile_32.cpu
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   1# CPU tuning section - shared with UML.
   2# Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML.
   3
   4#-mtune exists since gcc 3.4
   5HAS_MTUNE       := $(call cc-option-yn, -mtune=i386)
   6ifeq ($(HAS_MTUNE),y)
   7tune            = $(call cc-option,-mtune=$(1),$(2))
   8else
   9tune            = $(call cc-option,-mcpu=$(1),$(2))
  10endif
  11
  12align := $(cc-option-align)
  13cflags-$(CONFIG_M386)           += -march=i386
  14cflags-$(CONFIG_M486)           += -march=i486
  15cflags-$(CONFIG_M586)           += -march=i586
  16cflags-$(CONFIG_M586TSC)        += -march=i586
  17cflags-$(CONFIG_M586MMX)        += -march=pentium-mmx
  18cflags-$(CONFIG_M686)           += -march=i686
  19cflags-$(CONFIG_MPENTIUMII)     += -march=i686 $(call tune,pentium2)
  20cflags-$(CONFIG_MPENTIUMIII)    += -march=i686 $(call tune,pentium3)
  21cflags-$(CONFIG_MPENTIUMM)      += -march=i686 $(call tune,pentium3)
  22cflags-$(CONFIG_MPENTIUM4)      += -march=i686 $(call tune,pentium4)
  23cflags-$(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.
  26cflags-$(CONFIG_MK7)            += -march=athlon
  27cflags-$(CONFIG_MK8)            += $(call cc-option,-march=k8,-march=athlon)
  28cflags-$(CONFIG_MCRUSOE)        += -march=i686 $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
  29cflags-$(CONFIG_MEFFICEON)      += -march=i686 $(call tune,pentium3) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
  30cflags-$(CONFIG_MWINCHIPC6)     += $(call cc-option,-march=winchip-c6,-march=i586)
  31cflags-$(CONFIG_MWINCHIP3D)     += $(call cc-option,-march=winchip2,-march=i586)
  32cflags-$(CONFIG_MCYRIXIII)      += $(call cc-option,-march=c3,-march=i486) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
  33cflags-$(CONFIG_MVIAC3_2)       += $(call cc-option,-march=c3-2,-march=i686)
  34cflags-$(CONFIG_MVIAC7)         += -march=i686
  35cflags-$(CONFIG_MCORE2)         += -march=i686 $(call tune,core2)
  36cflags-$(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
  40cflags-$(CONFIG_MELAN)          += -march=i486
  41
  42# Geode GX1 support
  43cflags-$(CONFIG_MGEODEGX1)      += -march=pentium-mmx
  44cflags-$(CONFIG_MGEODE_LX)      += $(call cc-option,-march=geode,-march=pentium-mmx)
  45# add at the end to overwrite eventual tuning options from earlier
  46# cpu entries
  47cflags-$(CONFIG_X86_GENERIC)    += $(call tune,generic,$(call tune,i686))
  48
  49# Work around the pentium-mmx code generator madness of gcc4.4.x which
  50# does stack alignment by generating horrible code _before_ the mcount
  51# prologue (push %ebp, mov %esp, %ebp) which breaks the function graph
  52# tracer assumptions. For i686, generic, core2 this is set by the
  53# compiler anyway
  54ifeq ($(CONFIG_FUNCTION_GRAPH_TRACER), y)
  55ADD_ACCUMULATE_OUTGOING_ARGS := y
  56endif
  57
  58# Work around to a bug with asm goto with first implementations of it
  59# in gcc causing gcc to mess up the push and pop of the stack in some
  60# uses of asm goto.
  61ifeq ($(CONFIG_JUMP_LABEL), y)
  62ADD_ACCUMULATE_OUTGOING_ARGS := y
  63endif
  64
  65cflags-$(ADD_ACCUMULATE_OUTGOING_ARGS) += $(call cc-option,-maccumulate-outgoing-args)
  66
  67# Bug fix for binutils: this option is required in order to keep
  68# binutils from generating NOPL instructions against our will.
  69ifneq ($(CONFIG_X86_P6_NOP),y)
  70cflags-y                        += $(call cc-option,-Wa$(comma)-mtune=generic32,)
  71endif
  72
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