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Paolo 'Blaisorblade' Giarrusso96d55b82005-10-30 15:00:07 -08001# CPU tuning section - shared with UML.
2# Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML.
3
Andrew Mortona1365642006-01-08 01:04:09 -08004#-mtune exists since gcc 3.4
Paolo 'Blaisorblade' Giarrussod89ea9b2005-10-30 15:00:09 -08005HAS_MTUNE := $(call cc-option-yn, -mtune=i386)
6ifeq ($(HAS_MTUNE),y)
Lasse Collinb0b1ff62007-05-02 19:27:06 +02007tune = $(call cc-option,-mtune=$(1),$(2))
Paolo 'Blaisorblade' Giarrussod89ea9b2005-10-30 15:00:09 -08008else
Lasse Collinb0b1ff62007-05-02 19:27:06 +02009tune = $(call cc-option,-mcpu=$(1),$(2))
Paolo 'Blaisorblade' Giarrussod89ea9b2005-10-30 15:00:09 -080010endif
11
Paolo 'Blaisorblade' Giarrusso96d55b82005-10-30 15:00:07 -080012align := $(cc-option-align)
13cflags-$(CONFIG_M386) += -march=i386
14cflags-$(CONFIG_M486) += -march=i486
15cflags-$(CONFIG_M586) += -march=i586
16cflags-$(CONFIG_M586TSC) += -march=i586
Andrew Mortona1365642006-01-08 01:04:09 -080017cflags-$(CONFIG_M586MMX) += -march=pentium-mmx
Paolo 'Blaisorblade' Giarrusso96d55b82005-10-30 15:00:07 -080018cflags-$(CONFIG_M686) += -march=i686
Paolo 'Blaisorblade' Giarrussod89ea9b2005-10-30 15:00:09 -080019cflags-$(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 $(call tune,pentium4)
Paolo 'Blaisorblade' Giarrusso96d55b82005-10-30 15:00:07 -080023cflags-$(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.
Andrew Mortona1365642006-01-08 01:04:09 -080026cflags-$(CONFIG_MK7) += -march=athlon
27cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon)
Paolo 'Blaisorblade' Giarrusso96d55b82005-10-30 15:00:07 -080028cflags-$(CONFIG_MCRUSOE) += -march=i686 $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
Paolo 'Blaisorblade' Giarrussod89ea9b2005-10-30 15:00:09 -080029cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
Paolo 'Blaisorblade' Giarrusso96d55b82005-10-30 15:00:07 -080030cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586)
Paolo 'Blaisorblade' Giarrusso96d55b82005-10-30 15:00:07 -080031cflags-$(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) += $(call cc-option,-march=c3-2,-march=i686)
Simon Arlott0949be32007-05-02 19:27:05 +020034cflags-$(CONFIG_MVIAC7) += -march=i686
Lasse Collinb0b1ff62007-05-02 19:27:06 +020035cflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2)
Tobias Doerffel366d19e2009-08-21 23:06:23 +020036cflags-$(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))
Paolo 'Blaisorblade' Giarrusso96d55b82005-10-30 15:00:07 -080038
39# AMD Elan support
40cflags-$(CONFIG_X86_ELAN) += -march=i486
41
42# Geode GX1 support
Andrew Mortona1365642006-01-08 01:04:09 -080043cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx
Matteo Croce98059e32009-10-01 17:11:10 +020044cflags-$(CONFIG_MGEODE_LX) += $(call cc-option,-march=geode,-march=pentium-mmx)
Andi Kleendca99a32006-03-25 16:29:06 +010045# add at the end to overwrite eventual tuning options from earlier
46# cpu entries
Lasse Collinb0b1ff62007-05-02 19:27:06 +020047cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686))
Andi Kleendca99a32006-03-25 16:29:06 +010048
Thomas Gleixner746357d2009-11-20 12:01:43 +010049# 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
Thomas Gleixnerb8b7d792009-11-28 15:03:03 +010052# tracer assumptions. For i686, generic, core2 this is set by the
53# compiler anyway
54cflags-$(CONFIG_FUNCTION_GRAPH_TRACER) += $(call cc-option,-maccumulate-outgoing-args)
Thomas Gleixner746357d2009-11-20 12:01:43 +010055
H. Peter Anvin28f7e662008-09-08 12:01:48 -070056# Bug fix for binutils: this option is required in order to keep
57# binutils from generating NOPL instructions against our will.
58ifneq ($(CONFIG_X86_P6_NOP),y)
59cflags-y += $(call cc-option,-Wa$(comma)-mtune=generic32,)
60endif