| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | # CPU tuning section - shared with UML. |
| 3 | # Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML. |
| 4 | |
| 5 | #-mtune exists since gcc 3.4 |
| 6 | HAS_MTUNE := $(call cc-option-yn, -mtune=i386) |
| 7 | ifeq ($(HAS_MTUNE),y) |
| 8 | tune = $(call cc-option,-mtune=$(1),$(2)) |
| 9 | else |
| 10 | tune = $(call cc-option,-mcpu=$(1),$(2)) |
| 11 | endif |
| 12 | |
| 13 | cflags-$(CONFIG_M486) += -march=i486 |
| 14 | cflags-$(CONFIG_M586) += -march=i586 |
| 15 | cflags-$(CONFIG_M586TSC) += -march=i586 |
| 16 | cflags-$(CONFIG_M586MMX) += -march=pentium-mmx |
| 17 | cflags-$(CONFIG_M686) += -march=i686 |
| 18 | cflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call tune,pentium2) |
| 19 | cflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call tune,pentium3) |
| 20 | cflags-$(CONFIG_MPENTIUMM) += -march=i686 $(call tune,pentium3) |
| 21 | cflags-$(CONFIG_MPENTIUM4) += -march=i686 $(call tune,pentium4) |
| 22 | cflags-$(CONFIG_MK6) += -march=k6 |
| 23 | # Please note, that patches that add -march=athlon-xp and friends are pointless. |
| 24 | # They make zero difference whatsosever to performance at this time. |
| 25 | cflags-$(CONFIG_MK7) += -march=athlon |
| 26 | cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon) |
| 27 | cflags-$(CONFIG_MCRUSOE) += -march=i686 -falign-functions=0 -falign-jumps=0 -falign-loops=0 |
| 28 | cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) -falign-functions=0 -falign-jumps=0 -falign-loops=0 |
| 29 | cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586) |
| 30 | cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586) |
| 31 | cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) -falign-functions=0 -falign-jumps=0 -falign-loops=0 |
| 32 | cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686) |
| 33 | cflags-$(CONFIG_MVIAC7) += -march=i686 |
| 34 | cflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2) |
| 35 | cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom,$(call cc-option,-march=core2,-march=i686)) \ |
| 36 | $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) |
| 37 | |
| 38 | # AMD Elan support |
| 39 | cflags-$(CONFIG_MELAN) += -march=i486 |
| 40 | |
| 41 | # Geode GX1 support |
| 42 | cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx |
| 43 | cflags-$(CONFIG_MGEODE_LX) += $(call cc-option,-march=geode,-march=pentium-mmx) |
| 44 | # add at the end to overwrite eventual tuning options from earlier |
| 45 | # cpu entries |
| 46 | cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686)) |
| 47 | |
| 48 | # Bug fix for binutils: this option is required in order to keep |
| 49 | # binutils from generating NOPL instructions against our will. |
| 50 | ifneq ($(CONFIG_X86_P6_NOP),y) |
| 51 | cflags-y += $(call cc-option,-Wa$(comma)-mtune=generic32,) |
| 52 | endif |