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authorDarren Hart <dvhart@linux.intel.com>2014-01-17 22:25:49 +0000
committerRichard Purdie <richard.purdie@linuxfoundation.org>2014-01-28 00:50:53 +0000
commit31d3449e1ad6d334619fb2a7d958d18da9a0154e (patch)
tree7833d4bfc4f476a2bc44a5d58165a5c5642662a2 /meta/conf/machine
parent3a39071677c56cc69f39962b605be64499861f31 (diff)
downloadpoky-31d3449e1ad6d334619fb2a7d958d18da9a0154e.tar.gz
tune-core2: Replace -mtune=generic with -mtune=core2
-march specifies which ISA to use. -mtune specifies which cpu-type to optimize instruction ordering for, but not which ISA to use. There are times when it may make sense to specify mtune=generic and use a more specific march, such as core2, but the opposite makes little sense at all: use cpu-type specific ISA, but order the instructions generically. While the -mtune is implied by -march, gcc does not verify it is using -mtune=core2 with: gcc -Q -march=core2 --help=target Explicitly specify -mtune=core2 to be sure. Add a comment header describing the CPUs targeted by this tune file. (From OE-Core rev: 4cd33193b2db6c281275db2fb5cc169181955217) Signed-off-by: Darren Hart <dvhart@linux.intel.com> Cc: Richard Purdie <richard.purdie@linuxfoundation.org> Cc: Paul Eggleton <paul.eggleton@intel.com> Cc: Tom Zanussi <tom.zanussi@intel.com> Cc: Nitin Kamble <nitin.a.kamble@intel.com> Cc: Mark Hatle <mark.hatle@windriver.com> Cc: Bruce Ashfield <bruce.ashfield@windriver.com> Cc: Martin Jansa <martin.jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta/conf/machine')
-rw-r--r--meta/conf/machine/include/tune-core2.inc10
1 files changed, 9 insertions, 1 deletions
diff --git a/meta/conf/machine/include/tune-core2.inc b/meta/conf/machine/include/tune-core2.inc
index 85b69240ce..3b251972bb 100644
--- a/meta/conf/machine/include/tune-core2.inc
+++ b/meta/conf/machine/include/tune-core2.inc
@@ -1,10 +1,18 @@
1# Settings for the GCC(1) cpu-type "core2":
2#
3# Intel Core2 CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3 and SSSE3
4# instruction set support.
5#
6# This tune is recommended for the Intel Core 2 CPU family, including Conroe,
7# Merom and beyond, as well as the first Atom CPUs, Diamondville, and beyond.
8#
1DEFAULTTUNE ?= "core2" 9DEFAULTTUNE ?= "core2"
2 10
3require conf/machine/include/tune-i586.inc 11require conf/machine/include/tune-i586.inc
4 12
5# Extra tune features 13# Extra tune features
6TUNEVALID[core2] = "Enable core2 specific processor optimizations" 14TUNEVALID[core2] = "Enable core2 specific processor optimizations"
7TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "core2", " -march=core2 -msse3 -mtune=generic -mfpmath=sse", "", d)}" 15TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "core2", " -march=core2 -mtune=core2 -msse3 -mfpmath=sse", "", d)}"
8 16
9# Extra tune selections 17# Extra tune selections
10AVAILTUNES += "core2" 18AVAILTUNES += "core2"