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[POWERPC] add Kconfig option for optimizing for cell

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Since the PPE on cell is an in-order core, it suffers significantly
from wrong instruction scheduling.  This adds a Kconfig option that
enables passing -mtune=cell to gcc in order to generate object
code that runs well on cell.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Arnd Bergmann
2007-09-15 10:21:57 +10:00
committed by Paul Mackerras
parent fb8299ed31
commit 3164cccdc0
2 changed files with 16 additions and 0 deletions
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4
arch/powerpc/Makefile
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@@ -92,6 +92,10 @@ else
endif
endif
ifeq ($(CONFIG_TUNE_CELL),y)
CFLAGS += $(call cc-option,-mtune=cell)
endif
# No AltiVec instruction when building kernel
CFLAGS += $(call cc-option,-mno-altivec)