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[S390] config option for z9-109 code generation. 

Add a kernel config option for the IBM System z9. This will produce
faster code on newer compilers using the -march=z9-109 option.

Signed-off-by: Christian Borntraeger <cborntra@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2006-09-28 16:55:46 +02:00 committed by Martin Schwidefsky
parent d9f7a745d5
commit 0efa470363
2 changed files with 9 additions and 0 deletions
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8
arch/s390/Kconfig
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@ -153,6 +153,14 @@ config MARCH_Z990
This will be slightly faster but does not work on This will be slightly faster but does not work on
older machines such as the z900. older machines such as the z900.
config MARCH_Z9_109
bool "IBM System z9"
help
Select this to enable optimizations for IBM System z9-109, IBM
System z9 Enterprise Class (z9 EC), and IBM System z9 Business
Class (z9 BC). The kernel will be slightly faster but will not
work on older machines such as the z990, z890, z900, and z800.
endchoice endchoice
config PACK_STACK config PACK_STACK

1
arch/s390/Makefile
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@ -33,6 +33,7 @@ endif
cflags-$(CONFIG_MARCH_G5) += $(call cc-option,-march=g5) cflags-$(CONFIG_MARCH_G5) += $(call cc-option,-march=g5)
cflags-$(CONFIG_MARCH_Z900) += $(call cc-option,-march=z900) cflags-$(CONFIG_MARCH_Z900) += $(call cc-option,-march=z900)
cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990) cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990)
cflags-$(CONFIG_MARCH_Z9_109) += $(call cc-option,-march=z9-109)
# #
# Prevent tail-call optimizations, to get clearer backtraces: # Prevent tail-call optimizations, to get clearer backtraces: