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- # CPU tuning section - shared with UML.
- # Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML.
- #-mtune exists since gcc 3.4
- HAS_MTUNE := $(call cc-option-yn, -mtune=i386)
- ifeq ($(HAS_MTUNE),y)
- tune = $(call cc-option,-mtune=$(1),$(2))
- else
- tune = $(call cc-option,-mcpu=$(1),$(2))
- endif
- align := $(cc-option-align)
- cflags-$(CONFIG_M486) += -march=i486
- cflags-$(CONFIG_M586) += -march=i586
- cflags-$(CONFIG_M586TSC) += -march=i586
- cflags-$(CONFIG_M586MMX) += -march=pentium-mmx
- cflags-$(CONFIG_M686) += -march=i686
- cflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call tune,pentium2)
- cflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call tune,pentium3)
- cflags-$(CONFIG_MPENTIUMM) += -march=i686 $(call tune,pentium3)
- cflags-$(CONFIG_MPENTIUM4) += -march=i686 $(call tune,pentium4)
- cflags-$(CONFIG_MK6) += -march=k6
- # Please note, that patches that add -march=athlon-xp and friends are pointless.
- # They make zero difference whatsosever to performance at this time.
- cflags-$(CONFIG_MK7) += -march=athlon
- cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon)
- cflags-$(CONFIG_MCRUSOE) += -march=i686 $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
- cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
- cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586)
- cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586)
- cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
- cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686)
- cflags-$(CONFIG_MVIAC7) += -march=i686
- cflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2)
- cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom,$(call cc-option,-march=core2,-march=i686)) \
- $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
- # AMD Elan support
- cflags-$(CONFIG_MELAN) += -march=i486
- # Geode GX1 support
- cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx
- cflags-$(CONFIG_MGEODE_LX) += $(call cc-option,-march=geode,-march=pentium-mmx)
- # add at the end to overwrite eventual tuning options from earlier
- # cpu entries
- cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686))
- # Work around the pentium-mmx code generator madness of gcc4.4.x which
- # does stack alignment by generating horrible code _before_ the mcount
- # prologue (push %ebp, mov %esp, %ebp) which breaks the function graph
- # tracer assumptions. For i686, generic, core2 this is set by the
- # compiler anyway
- ifeq ($(CONFIG_FUNCTION_GRAPH_TRACER), y)
- ADD_ACCUMULATE_OUTGOING_ARGS := y
- endif
- # Work around to a bug with asm goto with first implementations of it
- # in gcc causing gcc to mess up the push and pop of the stack in some
- # uses of asm goto.
- ifeq ($(CONFIG_JUMP_LABEL), y)
- ADD_ACCUMULATE_OUTGOING_ARGS := y
- endif
- cflags-$(ADD_ACCUMULATE_OUTGOING_ARGS) += $(call cc-option,-maccumulate-outgoing-args)
- # Bug fix for binutils: this option is required in order to keep
- # binutils from generating NOPL instructions against our will.
- ifneq ($(CONFIG_X86_P6_NOP),y)
- cflags-y += $(call cc-option,-Wa$(comma)-mtune=generic32,)
- endif
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