arch/x86/Makefile_32.cpu

   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
   5 HAS_MTUNE       := $(call cc-option-yn, -mtune=i386)
   6 ifeq ($(HAS_MTUNE),y)
   7 tune            = $(call cc-option,-mtune=$(1),$(2))
   8 else
   9 tune            = $(call cc-option,-mcpu=$(1),$(2))
  10 endif
  11
  12 align := $(cc-option-align)
  13 cflags-$(CONFIG_M386)           += -march=i386
  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)-functions=0 $(align)-jumps=0 $(align)-loops=0
  29 cflags-$(CONFIG_MEFFICEON)      += -march=i686 $(call tune,pentium3) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
  30 cflags-$(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)-functions=0 $(align)-jumps=0 $(align)-loops=0
  33 cflags-$(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-$(CONFIG_X86_ELAN)       += -march=i486
  41
  42 # Geode GX1 support
  43 cflags-$(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 # 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
  54 cflags-$(CONFIG_FUNCTION_GRAPH_TRACER) += $(call cc-option,-maccumulate-outgoing-args)
  55
  56 # Bug fix for binutils: this option is required in order to keep
  57 # binutils from generating NOPL instructions against our will.
  58 ifneq ($(CONFIG_X86_P6_NOP),y)
  59 cflags-y                        += $(call cc-option,-Wa$(comma)-mtune=generic32,)
  60 endif