delta/go-git.git/src/math/big/ftoa.go, branch dev.debug

math/big: implement Float.Scan, type assert fmt interfaces to enforce docs

2016-10-19T03:25:30+00:00

Implements Float.Scan which satisfies fmt.Scanner interface.
Also enforces docs' interface implementation claims with compile time
type assertions, that is:
+ Float always implements fmt.Formatter and fmt.Scanner
+ Int always implements fmt.Formatter and fmt.Scanner
+ Rat always implements fmt.Formatter
which will ensure that the API claims are strictly matched.

Also note that Float.Scan doesn't handle ±Inf.

Fixes #17391

Change-Id: I3d3dfbe7f602066975c7a7794fe25b4c645440ce
Reviewed-on: https://go-review.googlesource.com/30723
Reviewed-by: Robert Griesemer

math/big: avoid panic in float.Text with negative prec

2016-06-01T19:20:52+00:00

Fixes #15918

Change-Id: I4b434aed262960a2e6c659d4c2296fbf662c3a52
Reviewed-on: https://go-review.googlesource.com/23633
Run-TryBot: Robert Griesemer 
Reviewed-by: Robert Griesemer 
TryBot-Result: Gobot Gobot

math/big: cleanup documentation for Format methods

2016-03-21T02:49:32+00:00

'b' is a standard verb for floating point values. The runes like '+'
and '#' are called "flags" by package fmt's documentation. The flag
'-' controls left/right justification, not anything related to signs.

Change-Id: Ia9cf81b002df373f274ce635fe09b5bd0066aa1c
Reviewed-on: https://go-review.googlesource.com/20930
Reviewed-by: Brad Fitzpatrick

math/big: fix comment typos

2016-03-15T20:41:15+00:00

Change-Id: I34cdc9cb3d32e86ff3a57db0012326c39cd55670
Reviewed-on: https://go-review.googlesource.com/20718
Reviewed-by: Robert Griesemer

math/big: more documentation

2015-09-29T00:23:51+00:00

Good enough for now.

Fixes #11241.

Change-Id: Ieb50809f104d20bcbe14daecac503f72486bec92
Reviewed-on: https://go-review.googlesource.com/15111
Reviewed-by: Alan Donovan

math/big: removed more unnecessary string conversions

2015-09-25T22:25:12+00:00

- renamed (nat) itoa to utoa (since that's what it is)
- added (nat) itoa that takes a sign parameter; this helps removing a few string copies
- used buffers instead of string+ in Rat conversions

Change-Id: I6b37a6b39557ae311cafdfe5c4a26e9246bde1a9
Reviewed-on: https://go-review.googlesource.com/14995
Reviewed-by: Alan Donovan

math/big: faster string conversion routines

2015-09-24T23:07:47+00:00

Eliminated unnecessary string conversions throughout and removed
(internal) capability for arbitrary character sets in conversion
routines (functionality was not exported and not used internally).

benchmark                         old ns/op     new ns/op     delta
BenchmarkDecimalConversion-8      198283        187085        -5.65%
BenchmarkStringPiParallel-8       46116         47822         +3.70%
BenchmarkString10Base2-8          216           166           -23.15%
BenchmarkString100Base2-8         886           762           -14.00%
BenchmarkString1000Base2-8        7296          6625          -9.20%
BenchmarkString10000Base2-8       72371         65563         -9.41%
BenchmarkString100000Base2-8      725849        672766        -7.31%
BenchmarkString10Base8-8          160           114           -28.75%
BenchmarkString100Base8-8         398           309           -22.36%
BenchmarkString1000Base8-8        2650          2244          -15.32%
BenchmarkString10000Base8-8       24974         21745         -12.93%
BenchmarkString100000Base8-8      245457        217489        -11.39%
BenchmarkString10Base10-8         337           288           -14.54%
BenchmarkString100Base10-8        1298          1046          -19.41%
BenchmarkString1000Base10-8       6200          5752          -7.23%
BenchmarkString10000Base10-8      24942         22589         -9.43%
BenchmarkString100000Base10-8     8012921       7947152       -0.82%
BenchmarkString10Base16-8         156           107           -31.41%
BenchmarkString100Base16-8        344           255           -25.87%
BenchmarkString1000Base16-8       2067          1705          -17.51%
BenchmarkString10000Base16-8      19026         16112         -15.32%
BenchmarkString100000Base16-8     184038        163457        -11.18%

Change-Id: I68bd807529bd9b985f4b6ac2a87764bcc1a7d2f7
Reviewed-on: https://go-review.googlesource.com/14926
Reviewed-by: Alan Donovan

math/big: fix test for denormalized inputs and enable more test cases

2015-09-24T22:23:55+00:00

Also: removed unnecessary BUG comment (was fixed).

Change-Id: I8f11fbcb4e30a19ec5a25df742b3e25e2ee7f846
Reviewed-on: https://go-review.googlesource.com/14923
Reviewed-by: Alan Donovan

math/big: factored out an internal accessor method (cleanup), added benchmark

2015-09-23T20:25:59+00:00

Current result of DecimalConversion benchmark (for future reference):

BenchmarkDecimalConversion-8	   10000	    204770 ns/op

Measured on Mac Mini (late 2012) running OS X 10.10.5,
2.3 GHz Intel Core i7, 8 GB 1333 MHz DDR3.

Also: Removed comment suggesting to implement decimal by representing
digits as numbers 0..9 rather than ASCII chars '0'..'9' to avoid
repeated +/-'0' operations. Tried and it appears (per above benchmark)
that the +/-'0' operations are neglibile but the addition conversion
passes around it are not and that it makes things significantly slower.

Change-Id: I6ee033b1172043248093cc5d02abff5fc54c2e7a
Reviewed-on: https://go-review.googlesource.com/14857
Reviewed-by: Brad Fitzpatrick 
Run-TryBot: Robert Griesemer 
TryBot-Result: Gobot Gobot 
Reviewed-by: Alan Donovan

math/big: implement negative precision for Float.Append/Text

2015-09-23T16:45:38+00:00

Enabled all but a handful of disabled Float formatting test cases.

Fixes #10991.

Change-Id: Id18e160e857be2743429a377000e996978015a1a
Reviewed-on: https://go-review.googlesource.com/14850
Reviewed-by: Alan Donovan