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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 |
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 |
61 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9