Root/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
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-$(CONFIG_X86_ELAN) += -march=i486
41
42# Geode GX1 support
43cflags-$(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
54cflags-$(CONFIG_FUNCTION_GRAPH_TRACER) += $(call cc-option,-maccumulate-outgoing-args)
55
56# Bug fix for binutils: this option is required in order to keep
57# binutils from generating NOPL instructions against our will.
58ifneq ($(CONFIG_X86_P6_NOP),y)
59cflags-y += $(call cc-option,-Wa$(comma)-mtune=generic32,)
60endif
61

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