| 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-$(CONFIG_MELAN) += -march=i486 |
| 41 | |
| 42 | # Geode GX1 support |
| 43 | cflags-$(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 | ifeq ($(CONFIG_FUNCTION_GRAPH_TRACER), y) |
| 55 | ADD_ACCUMULATE_OUTGOING_ARGS := y |
| 56 | endif |
| 57 | |
| 58 | # Work around to a bug with asm goto with first implementations of it |
| 59 | # in gcc causing gcc to mess up the push and pop of the stack in some |
| 60 | # uses of asm goto. |
| 61 | ifeq ($(CONFIG_JUMP_LABEL), y) |
| 62 | ADD_ACCUMULATE_OUTGOING_ARGS := y |
| 63 | endif |
| 64 | |
| 65 | cflags-$(ADD_ACCUMULATE_OUTGOING_ARGS) += $(call cc-option,-maccumulate-outgoing-args) |
| 66 | |
| 67 | # Bug fix for binutils: this option is required in order to keep |
| 68 | # binutils from generating NOPL instructions against our will. |
| 69 | ifneq ($(CONFIG_X86_P6_NOP),y) |
| 70 | cflags-y += $(call cc-option,-Wa$(comma)-mtune=generic32,) |
| 71 | endif |