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  1. 03 Jun, 2012 1 commit
    • Russ Cox's avatar
      exp/html/atom: faster Lookup with smaller tables · 19255059
      Russ Cox authored 
      Use perfect cuckoo hash, to avoid binary search.
Define Atom bits as offset+len in long string instead
of enumeration, to avoid string headers.

Before: 1909 string bytes + 6060 tables = 7969 total data
After: 1406 string bytes + 2048 tables = 3454 total data

benchmark          old ns/op    new ns/op    delta
BenchmarkLookup        83878        64681  -22.89%

R=nigeltao, r
CC=golang-dev
https://golang.org/cl/6262051
      19255059
  3. 02 Jun, 2012 9 commits
  5. 01 Jun, 2012 5 commits
  7. 31 May, 2012 8 commits
  9. 30 May, 2012 17 commits
    • Dave Cheney's avatar
      cmd/go: add -ccflags · 5b2cd445
      Dave Cheney authored 
      Add -ccflags to pass arguments to {5,6,8}c
similar to -gcflags for {5,6,8}g.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6260047
      5b2cd445
    • Russ Cox's avatar
      cmd/gc: contiguous loop layout · 001b75c9
      Russ Cox authored 
      Drop expecttaken function in favor of extra argument
to gbranch and bgen. Mark loop condition as likely to
be true, so that loops are generated inline.

The main benefit here is contiguous code when trying
to read the generated assembly. It has only minor effects
on the timing, and they mostly cancel the minor effects
that aligning function entry points had.  One exception:
both changes made Fannkuch faster.

Compared to before CL 6244066 (before aligned functions)
benchmark                 old ns/op    new ns/op    delta
BenchmarkBinaryTree17    4222117400   4201958800   -0.48%
BenchmarkFannkuch11      3462631800   3215908600   -7.13%
BenchmarkGobDecode         20887622     20899164   +0.06%
BenchmarkGobEncode          9548772      9439083   -1.15%
BenchmarkGzip                151687       152060   +0.25%
BenchmarkGunzip                8742         8711   -0.35%
BenchmarkJSONEncode        62730560     62686700   -0.07%
BenchmarkJSONDecode       252569180    252368960   -0.08%
BenchmarkMandelbrot200      5267599      5252531   -0.29%
BenchmarkRevcomp25M       980813500    985248400   +0.45%
BenchmarkTemplate         361259100    357414680   -1.06%

Compared to tip (aligned functions):
benchmark                 old ns/op    new ns/op    delta
BenchmarkBinaryTree17    4140739800   4201958800   +1.48%
BenchmarkFannkuch11      3259914400   3215908600   -1.35%
BenchmarkGobDecode         20620222     20899164   +1.35%
BenchmarkGobEncode          9384886      9439083   +0.58%
BenchmarkGzip                150333       152060   +1.15%
BenchmarkGunzip                8741         8711   -0.34%
BenchmarkJSONEncode        65210990     62686700   -3.87%
BenchmarkJSONDecode       249394860    252368960   +1.19%
BenchmarkMandelbrot200      5273394      5252531   -0.40%
BenchmarkRevcomp25M       996013800    985248400   -1.08%
BenchmarkTemplate         360620840    357414680   -0.89%

R=ken2
CC=golang-dev
https://golang.org/cl/6245069
      001b75c9
    • Mikio Hara's avatar
      net: fix test to avoid unintentional nil pointer dereference · aad8e954
      Mikio Hara authored 
      R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/6248065
      aad8e954
    • Russ Cox's avatar
      cmd/5l: fix PLD · 6a5660f1
      Russ Cox authored 
      Was missing break.

R=ken2
CC=golang-dev
https://golang.org/cl/6250078
      6a5660f1
    • Russ Cox's avatar
      cmd/6l, cmd/8l, cmd/5l: add AUNDEF instruction · f2bd3a97
      Russ Cox authored 
      On 6l and 8l, this is a real instruction, guaranteed to
cause an 'undefined instruction' exception.

On 5l, we simulate it as BL to address 0.

The plan is to use it as a signal to the linker that this
point in the instruction stream cannot be reached
(hence the changes to nofollow).  This will help the
compiler explain that panicindex and friends do not
return without having to put a list of these functions
in the linker.

R=ken2
CC=golang-dev
https://golang.org/cl/6255064
      f2bd3a97
    • Russ Cox's avatar
      cmd/ld: align function entry on arch-specific boundary · 8820ab5d
      Russ Cox authored 
      16 seems pretty standard on x86 for function entry.
I don't know if ARM would benefit, so I used just 4
(single instruction alignment).

This has a minor absolute effect on the current timings.
The main hope is that it will make them more consistent from
run to run.

benchmark                 old ns/op    new ns/op    delta
BenchmarkBinaryTree17    4222117400   4140739800   -1.93%
BenchmarkFannkuch11      3462631800   3259914400   -5.85%
BenchmarkGobDecode         20887622     20620222   -1.28%
BenchmarkGobEncode          9548772      9384886   -1.72%
BenchmarkGzip                151687       150333   -0.89%
BenchmarkGunzip                8742         8741   -0.01%
BenchmarkJSONEncode        62730560     65210990   +3.95%
BenchmarkJSONDecode       252569180    249394860   -1.26%
BenchmarkMandelbrot200      5267599      5273394   +0.11%
BenchmarkRevcomp25M       980813500    996013800   +1.55%
BenchmarkTemplate         361259100    360620840   -0.18%

R=ken2
CC=golang-dev
https://golang.org/cl/6244066
      8820ab5d
    • Russ Cox's avatar
      cmd/6l, cmd/8l: fix chaining bug in jump rewrite · b91cf505
      Russ Cox authored 
      The code was inconsistent about when it used
brchain(x) and when it used x directly, with the result
that you could end up emitting code for brchain(x) but
leave the jump pointing at an unemitted x.

R=ken2
CC=golang-dev
https://golang.org/cl/6250077
      b91cf505
    • Ivan Krasin's avatar
      compress/flate: fix overflow on 2GB input. Reset hashOffset every 16 MB. · 37f046ba
      Ivan Krasin authored 
      This bug has been introduced in the following revision:

changeset:   11404:26dceba5c610
user:        Ivan Krasin <krasin@golang.org>
date:        Mon Jan 23 09:19:39 2012 -0500
summary:     compress/flate: reduce memory pressure at cost of additional arithmetic operation.

This is the review page for that CL: https://golang.org/cl/5555070/

R=rsc, imkrasin
CC=golang-dev
https://golang.org/cl/6249067
      37f046ba
    • Mats Lidell's avatar
      go-mode: Works for both GNU-Emacs and XEmacs-21.5 · b8a02560
      Mats Lidell authored 
      Fixes some portability issues between the Emacsen.

R=golang-dev, sameer, bradfitz, ryanb
CC=golang-dev
https://golang.org/cl/6206043
      b8a02560
    • Rob Pike's avatar
      test/bench/shootout: more speedups · 6f3ffd4d
      Rob Pike authored 
      Most significant in mandelbrot, from avoiding MOVSD between registers,
but there are others.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6258063
      6f3ffd4d
    • Russ Cox's avatar
      cmd/6g: avoid MOVSD between registers · a768de83
      Russ Cox authored 
      MOVSD only copies the low half of the packed register pair,
while MOVAPD copies both halves.  I assume the internal
register renaming works better with the latter, since it makes
our code run 25% faster.

Before:
mandelbrot 16000
        gcc -O2 mandelbrot.c	28.44u 0.00s 28.45r
        gc mandelbrot	44.12u 0.00s 44.13r
        gc_B mandelbrot	44.17u 0.01s 44.19r

After:
mandelbrot 16000
        gcc -O2 mandelbrot.c	28.22u 0.00s 28.23r
        gc mandelbrot	32.81u 0.00s 32.82r
        gc_B mandelbrot	32.82u 0.00s 32.83r

R=ken2
CC=golang-dev
https://golang.org/cl/6248068
      a768de83
    • Russ Cox's avatar
      shootout: make mandelbrot.go more like mandelbrot.c · eb056dbe
      Russ Cox authored 
      Surprise! The C code is using floating point values for its counters.
Its off the critical path, but the Go code and C code are supposed to
be as similar as possible to make comparisons meaningful.

It doesn't have a significant effect.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6260058
      eb056dbe
    • Sameer Ajmani's avatar
      A+C: add Mats Lidell. He signed the agreement with the Sweden email · 3806cc7b
      Sameer Ajmani authored 
      address, but his changelist is under the Gmail address.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6248069
      3806cc7b
    • Jean-Marc Eurin's avatar
      misc/emacs: Use patch output of gofmt instead of replacing the buffer. · 7b6111a9
      Jean-Marc Eurin authored 
      This uses the patch output of gofmt (-d option) and applies each
chunk to the buffer, instead of replacing the whole buffer.  The
main advantage is that the undo history is kept across gofmt'ings,
so it can really be used as a before-save-hook.

R=sameer, sameer
CC=golang-dev
https://golang.org/cl/6198047
      7b6111a9
    • Rob Pike's avatar
      test/bench/shootout/timing.log: mandelbrot is restored · ec4d2135
      Rob Pike authored 
      R=golang-dev, bradfitz, rsc
CC=golang-dev
https://golang.org/cl/6259054
      ec4d2135
    • Joel Sing's avatar
      runtime: always initialise procid on netbsd · deb93b0f
      Joel Sing authored 
      The correct procid is needed for unparking LWPs on NetBSD - always
initialise procid in minit() so that cgo works correctly. The non-cgo
case already works correctly since procid is initialised via
lwp_create().

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6257071
      deb93b0f
    • Jan Ziak's avatar
      runtime: update field types in preparation for GC changes · 334bf95f
      Jan Ziak authored 
      R=rsc, remyoudompheng, minux.ma, ality
CC=golang-dev
https://golang.org/cl/6242061
      334bf95f