Ben Shi 69261ecad6 runtime: use hardware divider to improve performance ... The hardware divider is an optional component of ARMv7. This patch detects whether it is available in runtime and use it or not. 1. The hardware divider is detected at startup and a flag is set/clear according to a perticular bit of runtime.hwcap. 2. Each call of runtime.udiv will check this flag and decide if use the hardware division instruction. A rough test shows the performance improves 40-50% for ARMv7. And the compatibility of ARMv5/v6 is not broken. fixes #19118 Change-Id: Ic586bc9659ebc169553ca2004d2bdb721df823ac Reviewed-on: https://go-review.googlesource.com/37496 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>		2017-04-11 12:25:55 +00:00
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addr2line	cmd/go: build test binaries with -s in addition to -w	2017-03-29 17:18:16 +00:00
api
asm	runtime: use hardware divider to improve performance	2017-04-11 12:25:55 +00:00
cgo	cmd/cgo: support floating point #define macros	2017-04-07 21:09:44 +00:00
compile	cmd/compile/internal/ssa: remove unused Typ fields	2017-04-11 06:18:36 +00:00
cover
dist	cmd/go: allow full flag processing in go vet	2017-04-10 15:10:30 +00:00
doc	cmd/doc: implement "go doc struct.field"	2017-03-22 05:37:50 +00:00
fix	cmd/fix,cmd/gofmt: flush to disk before diffing	2017-03-30 18:19:57 +00:00
go	cmd/go: allow full flag processing in go vet	2017-04-10 15:10:30 +00:00
gofmt	cmd/fix,cmd/gofmt: flush to disk before diffing	2017-03-30 18:19:57 +00:00
internal	runtime: use hardware divider to improve performance	2017-04-11 12:25:55 +00:00
link	Revert "cmd/compile: output DWARF lexical blocks for local variables"	2017-04-07 19:52:26 +00:00
nm
objdump	cmd/objdump: print Go code alongside assembly	2017-04-05 06:20:40 +00:00
pack
pprof	cmd/pprof: update README to explain relationship with github.com/google/pprof	2017-04-10 19:51:01 +00:00
trace
vendor
vet	cmd/go: allow full flag processing in go vet	2017-04-10 15:10:30 +00:00