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authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2005-10-30 18:00:09 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 20:37:16 -0500
commitd89ea9b8bb4c4ad63122cd2d2ee5110a52da51b8 (patch)
treec729040e58c76b23d66bba40f1e8e989a7fea2ac /arch/i386
parent6a351cfeadd4b56a2a0031020c0cfb07cc0337fb (diff)
[PATCH] i386: use -mcpu, not -mtune, for GCCs older than 3.4
I just noted that -mtune is used, which is only supported on recent GCCs; by reading http://gcc.gnu.org/gcc-3.4/changes.html, you see "-mcpu has been renamed to -mtune.", so for GCC < 3.4 we're not using any specific tuning in the appropriate cases. However -mcpu is deprecated, so use -mtune when possible. This was introduced by commit e9d4dce954a60dc23dd1d967766ca2347b780e54 of the old tree (between 2.6.10-rc3 and 2.6.10) by Linus Torvalds, to remove the use of -march, since that could trigger gcc using SSE on its own. But no attention was used about using -mcpu vs. -mtune. And btw, the old 2.6.4 code (for instance) was: cflags-$(CONFIG_MPENTIUMII) += $(call check_gcc,-march=pentium2,-march=i686) cflags-$(CONFIG_MPENTIUMIII) += $(call check_gcc,-march=pentium3,-march=i686) cflags-$(CONFIG_MPENTIUMM) += $(call check_gcc,-march=pentium3,-march=i686) cflags-$(CONFIG_MPENTIUM4) += $(call check_gcc,-march=pentium4,-march=i686) Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/Makefile.cpu18
1 files changed, 13 insertions, 5 deletions
diff --git a/arch/i386/Makefile.cpu b/arch/i386/Makefile.cpu
index 86c7bb1b95e5..8e51456df23d 100644
--- a/arch/i386/Makefile.cpu
+++ b/arch/i386/Makefile.cpu
@@ -1,6 +1,14 @@
1# CPU tuning section - shared with UML. 1# CPU tuning section - shared with UML.
2# Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML. 2# Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML.
3 3
4#-mtune exists since gcc 3.4, and some -mcpu flavors didn't exist in gcc 2.95.
5HAS_MTUNE := $(call cc-option-yn, -mtune=i386)
6ifeq ($(HAS_MTUNE),y)
7tune = $(call cc-option,-mtune=$(1),)
8else
9tune = $(call cc-option,-mcpu=$(1),)
10endif
11
4align := $(cc-option-align) 12align := $(cc-option-align)
5cflags-$(CONFIG_M386) += -march=i386 13cflags-$(CONFIG_M386) += -march=i386
6cflags-$(CONFIG_M486) += -march=i486 14cflags-$(CONFIG_M486) += -march=i486
@@ -8,17 +16,17 @@ cflags-$(CONFIG_M586) += -march=i586
8cflags-$(CONFIG_M586TSC) += -march=i586 16cflags-$(CONFIG_M586TSC) += -march=i586
9cflags-$(CONFIG_M586MMX) += $(call cc-option,-march=pentium-mmx,-march=i586) 17cflags-$(CONFIG_M586MMX) += $(call cc-option,-march=pentium-mmx,-march=i586)
10cflags-$(CONFIG_M686) += -march=i686 18cflags-$(CONFIG_M686) += -march=i686
11cflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call cc-option,-mtune=pentium2) 19cflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call tune,pentium2)
12cflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call cc-option,-mtune=pentium3) 20cflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call tune,pentium3)
13cflags-$(CONFIG_MPENTIUMM) += -march=i686 $(call cc-option,-mtune=pentium3) 21cflags-$(CONFIG_MPENTIUMM) += -march=i686 $(call tune,pentium3)
14cflags-$(CONFIG_MPENTIUM4) += -march=i686 $(call cc-option,-mtune=pentium4) 22cflags-$(CONFIG_MPENTIUM4) += -march=i686 $(call tune,pentium4)
15cflags-$(CONFIG_MK6) += -march=k6 23cflags-$(CONFIG_MK6) += -march=k6
16# Please note, that patches that add -march=athlon-xp and friends are pointless. 24# Please note, that patches that add -march=athlon-xp and friends are pointless.
17# They make zero difference whatsosever to performance at this time. 25# They make zero difference whatsosever to performance at this time.
18cflags-$(CONFIG_MK7) += $(call cc-option,-march=athlon,-march=i686 $(align)-functions=4) 26cflags-$(CONFIG_MK7) += $(call cc-option,-march=athlon,-march=i686 $(align)-functions=4)
19cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,$(call cc-option,-march=athlon,-march=i686 $(align)-functions=4)) 27cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,$(call cc-option,-march=athlon,-march=i686 $(align)-functions=4))
20cflags-$(CONFIG_MCRUSOE) += -march=i686 $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0 28cflags-$(CONFIG_MCRUSOE) += -march=i686 $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
21cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call cc-option,-mtune=pentium3) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0 29cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
22cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586) 30cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586)
23cflags-$(CONFIG_MWINCHIP2) += $(call cc-option,-march=winchip2,-march=i586) 31cflags-$(CONFIG_MWINCHIP2) += $(call cc-option,-march=winchip2,-march=i586)
24cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586) 32cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586)