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Josh Bleecher Snyder 5848b6c9b8 cmd/compile: shrink specialized convT2x call sites 
convT2E16 and other specialized type-to-interface routines
accept a type/itab argument and return a complete interface value.
However, we know enough in the routine to do without the type.
And the caller can construct the interface value using the type.

Doing so shrinks the call sites of ten of the specialized convT2x routines.
It also lets us unify the empty and non-empty interface routines.

Cuts 12k off cmd/go.

name                         old time/op  new time/op  delta
ConvT2ESmall-8               2.96ns ± 2%  2.34ns ± 4%  -21.01%  (p=0.000 n=175+189)
ConvT2EUintptr-8             3.00ns ± 3%  2.34ns ± 4%  -22.02%  (p=0.000 n=189+187)
ConvT2ELarge-8               21.3ns ± 7%  21.5ns ± 5%   +1.02%  (p=0.000 n=200+197)
ConvT2ISmall-8               2.99ns ± 4%  2.33ns ± 3%  -21.95%  (p=0.000 n=193+184)
ConvT2IUintptr-8             3.02ns ± 3%  2.33ns ± 3%  -22.82%  (p=0.000 n=198+190)
ConvT2ILarge-8               21.7ns ± 5%  22.2ns ± 4%   +2.31%  (p=0.000 n=199+198)
ConvT2Ezero/zero/16-8        2.96ns ± 2%  2.33ns ± 3%  -21.11%  (p=0.000 n=174+187)
ConvT2Ezero/zero/32-8        2.96ns ± 1%  2.35ns ± 4%  -20.62%  (p=0.000 n=163+193)
ConvT2Ezero/zero/64-8        2.99ns ± 2%  2.34ns ± 4%  -21.78%  (p=0.000 n=183+188)
ConvT2Ezero/zero/str-8       3.27ns ± 3%  2.54ns ± 3%  -22.32%  (p=0.000 n=195+192)
ConvT2Ezero/zero/slice-8     3.46ns ± 4%  2.81ns ± 3%  -18.96%  (p=0.000 n=197+164)
ConvT2Ezero/zero/big-8       88.4ns ±20%  90.0ns ±20%   +1.84%  (p=0.000 n=196+198)
ConvT2Ezero/nonzero/16-8     12.6ns ± 3%  12.3ns ± 3%   -2.34%  (p=0.000 n=167+196)
ConvT2Ezero/nonzero/32-8     12.3ns ± 4%  11.9ns ± 3%   -2.95%  (p=0.000 n=187+193)
ConvT2Ezero/nonzero/64-8     14.2ns ± 6%  13.8ns ± 5%   -2.94%  (p=0.000 n=198+199)
ConvT2Ezero/nonzero/str-8    27.2ns ± 5%  26.8ns ± 5%   -1.33%  (p=0.000 n=200+198)
ConvT2Ezero/nonzero/slice-8  33.3ns ± 8%  33.1ns ± 6%   -0.82%  (p=0.000 n=199+200)
ConvT2Ezero/nonzero/big-8    88.8ns ±22%  90.2ns ±18%   +1.58%  (p=0.000 n=200+199)


Neligible toolspeed impact.

name        old alloc/op      new alloc/op      delta
Template         35.4MB ± 0%       35.3MB ± 0%  -0.06%  (p=0.008 n=5+5)
Unicode          29.1MB ± 0%       29.1MB ± 0%    ~     (p=0.310 n=5+5)
GoTypes           122MB ± 0%        122MB ± 0%  -0.08%  (p=0.008 n=5+5)
Compiler          514MB ± 0%        513MB ± 0%  -0.02%  (p=0.008 n=5+5)
SSA              1.94GB ± 0%       1.94GB ± 0%  -0.01%  (p=0.008 n=5+5)
Flate            24.2MB ± 0%       24.2MB ± 0%    ~     (p=0.548 n=5+5)
GoParser         28.5MB ± 0%       28.5MB ± 0%  -0.05%  (p=0.016 n=5+5)
Reflect          86.3MB ± 0%       86.2MB ± 0%  -0.02%  (p=0.008 n=5+5)
Tar              34.9MB ± 0%       34.9MB ± 0%    ~     (p=0.095 n=5+5)
XML              47.1MB ± 0%       47.1MB ± 0%  -0.05%  (p=0.008 n=5+5)
[Geo mean]       81.0MB            81.0MB       -0.03%

name        old allocs/op     new allocs/op     delta
Template           349k ± 0%         349k ± 0%  -0.08%  (p=0.008 n=5+5)
Unicode            340k ± 0%         340k ± 0%    ~     (p=0.111 n=5+5)
GoTypes           1.28M ± 0%        1.28M ± 0%  -0.09%  (p=0.008 n=5+5)
Compiler          4.92M ± 0%        4.92M ± 0%  -0.08%  (p=0.008 n=5+5)
SSA               15.3M ± 0%        15.3M ± 0%  -0.03%  (p=0.008 n=5+5)
Flate              233k ± 0%         233k ± 0%    ~     (p=0.500 n=5+5)
GoParser           292k ± 0%         292k ± 0%  -0.06%  (p=0.008 n=5+5)
Reflect           1.05M ± 0%        1.05M ± 0%  -0.02%  (p=0.008 n=5+5)
Tar                344k ± 0%         343k ± 0%  -0.06%  (p=0.008 n=5+5)
XML                430k ± 0%         429k ± 0%  -0.08%  (p=0.008 n=5+5)
[Geo mean]         809k              809k       -0.05%

name        old object-bytes  new object-bytes  delta
Template          507kB ± 0%        507kB ± 0%  -0.04%  (p=0.008 n=5+5)
Unicode           225kB ± 0%        225kB ± 0%    ~     (all equal)
GoTypes          1.85MB ± 0%       1.85MB ± 0%  -0.08%  (p=0.008 n=5+5)
Compiler         6.75MB ± 0%       6.75MB ± 0%  +0.01%  (p=0.008 n=5+5)
SSA              21.4MB ± 0%       21.4MB ± 0%  -0.02%  (p=0.008 n=5+5)
Flate             328kB ± 0%        328kB ± 0%  -0.03%  (p=0.008 n=5+5)
GoParser          403kB ± 0%        402kB ± 0%  -0.06%  (p=0.008 n=5+5)
Reflect          1.41MB ± 0%       1.41MB ± 0%  -0.03%  (p=0.008 n=5+5)
Tar               457kB ± 0%        457kB ± 0%  -0.05%  (p=0.008 n=5+5)
XML               601kB ± 0%        600kB ± 0%  -0.16%  (p=0.008 n=5+5)
[Geo mean]       1.05MB            1.04MB       -0.05%


Change-Id: I677a4108c0ecd32617549294036aa84f9214c4fe
Reviewed-on: https://go-review.googlesource.com/c/147360
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
2018-11-06 00:02:14 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api syscall: FreeBSD 12 ino64 support 2018-10-05 21:38:13 +00:00
doc doc: document Go 1.10.5 2018-11-02 19:43:46 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc cmd/cgo: accept expressions as untyped constants 2018-11-02 19:28:58 +00:00
src cmd/compile: shrink specialized convT2x call sites 2018-11-06 00:02:14 +00:00
test test: add test that gccgo failed to compile 2018-11-05 20:54:58 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
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