The implementation is similar to the one from the double-conversion
library used in the Chrome V8 engine.
old ns/op new ns/op speedup
BenchmarkAppendFloatDecimal 591 480 1.2x
BenchmarkAppendFloat 2956 486 6.1x
BenchmarkAppendFloatExp 10622 503 21.1x
BenchmarkAppendFloatNegExp 40343 483 83.5x
BenchmarkAppendFloatBig 2798 664 4.2x
See F. Loitsch, ``Printing Floating-Point Numbers Quickly and
Accurately with Integers'', Proceedings of the ACM, 2010.
R=rsc
CC=golang-dev, remy
https://golang.org/cl/5502079
This makes decimal a good test
case for the escape analysis.
With escape analysis:
benchmark old ns/op new ns/op delta
BenchmarkAtof64Decimal 1954 243 -87.56%
BenchmarkAtof64Float 2008 293 -85.41%
BenchmarkAtof64FloatExp 10106 8814 -12.78%
BenchmarkAtof64Big 5113 3486 -31.82%
R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4861042
Just enough to make mov instructions work,
which in turn is enough to make strconv work
when it avoids any floating point calculations.
That makes a bunch of other packages pass
their tests.
Should suffice until hardware floating point
is available.
Enable package tests that now pass
(some due to earlier fixes).
Looks like there is a new integer math bug
exposed in the fmt and json tests.
R=ken2
CC=golang-dev
https://golang.org/cl/2638041
parsing and printing to new syntax.
Use -oldparser to parse the old syntax,
use -oldprinter to print the old syntax.
2) Change default gofmt formatting settings
to use tabs for indentation only and to use
spaces for alignment. This will make the code
alignment insensitive to an editor's tabwidth.
Use -spaces=false to use tabs for alignment.
3) Manually changed src/exp/parser/parser_test.go
so that it doesn't try to parse the parser's
source files using the old syntax (they have
new syntax now).
4) gofmt -w src misc test/bench
4th set of files.
R=rsc
CC=golang-dev
https://golang.org/cl/180049
whole-package compilation. new Makefiles,
tests now in separate package
bytes
flag
fmt
io
math
once
os
reflect
strconv
sync
time
utf8
delete import "xxx" in package xxx.
inside package xxx, xxx is not declared
anymore so s/xxx.//g
delete file and package level forward declarations.
note the new internal_test.go and sync
and strconv to provide public access to
internals during testing. the installed version
of the package omits that file and thus does
not open the internals to all clients.
R=r
OCL=33065
CL=33097