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goarch.bbclass: Define HOST_GO386 and TARGET_GO386

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These variables are used to control the floating-point instructions emitted by
the go compiler for x86 architectures.

The default is '387' which disables the use of sse/sse2 instructions and is safe
to use on all x86 processors from the i486 onwards.

If TUNE_FEATURES contains a feature set which is known to support sse/sse2
instructions then they are set to 'sse2' to enable the use of these
instructions. This is suitable for most processors from Pentium 4 onwards.

Only the 'core2' and 'corei7' TUNE_FEATURES are defined in the oe-core layer and
are known to support ss2 instructions. Other layers may introduce additional
tunings which support sse2 instructions and for these layers, TARGET_GO386
or go_map_386 should be overridden as needed.

(From OE-Core rev: 7e96cf3c9850dc34d53af73a9ac22b1624994484)

Signed-off-by: Paul Barker <pbarker@toganlabs.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Paul Barker
2017-10-13 19:25:28 +00:00
committed by Richard Purdie
parent df645a936a
commit 68e77cfb8a
1 changed files with 11 additions and 0 deletions
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11
meta/classes/goarch.bbclass
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@@ -4,10 +4,12 @@ BUILD_GOTUPLE = "${BUILD_GOOS}_${BUILD_GOARCH}"
HOST_GOOS = "${@go_map_os(d.getVar('HOST_OS'), d)}"
HOST_GOARCH = "${@go_map_arch(d.getVar('HOST_ARCH'), d)}"
HOST_GOARM = "${@go_map_arm(d.getVar('HOST_ARCH'), d.getVar('TUNE_FEATURES'), d)}"
HOST_GO386 = "${@go_map_386(d.getVar('HOST_ARCH'), d.getVar('TUNE_FEATURES'), d)}"
HOST_GOTUPLE = "${HOST_GOOS}_${HOST_GOARCH}"
TARGET_GOOS = "${@go_map_os(d.getVar('TARGET_OS'), d)}"
TARGET_GOARCH = "${@go_map_arch(d.getVar('TARGET_ARCH'), d)}"
TARGET_GOARM = "${@go_map_arm(d.getVar('TARGET_ARCH'), d.getVar('TUNE_FEATURES'), d)}"
TARGET_GO386 = "${@go_map_386(d.getVar('TARGET_ARCH'), d.getVar('TUNE_FEATURES'), d)}"
TARGET_GOTUPLE = "${TARGET_GOOS}_${TARGET_GOARCH}"
GO_BUILD_BINDIR = "${@['bin/${HOST_GOTUPLE}','bin'][d.getVar('BUILD_GOTUPLE') == d.getVar('HOST_GOTUPLE')]}"
@@ -66,6 +68,15 @@ def go_map_arm(a, f, d):
return '5'
return ''
def go_map_386(a, f, d):
import re
if re.match('i.86', a):
if ('core2' in f) or ('corei7' in f):
return 'sse2'
else:
return '387'
return ''
def go_map_os(o, d):
if o.startswith('linux'):
return 'linux'