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Ben Shi cd65bbc01b cmd/compile/internal/ssa: optimize 386's subtraction 
The SUBL instruction can take a memory operand, and this CL
implements this optimization.

The go1 benchmark shows a little improvement.

name                     old time/op    new time/op    delta
BinaryTree17-4              3.27s ± 2%     3.29s ± 3%    ~     (p=0.322 n=37+40)
Fannkuch11-4                3.49s ± 0%     3.53s ± 1%  +1.21%  (p=0.000 n=31+40)
FmtFprintfEmpty-4          46.2ns ± 3%    46.3ns ± 2%    ~     (p=0.351 n=40+28)
FmtFprintfString-4         82.0ns ± 3%    81.5ns ± 2%  -0.69%  (p=0.002 n=40+30)
FmtFprintfInt-4            94.6ns ± 3%    94.6ns ± 6%    ~     (p=0.913 n=39+37)
FmtFprintfIntInt-4          147ns ± 3%     150ns ± 2%  +1.72%  (p=0.000 n=40+25)
FmtFprintfPrefixedInt-4     186ns ± 3%     186ns ± 0%  -0.33%  (p=0.006 n=40+25)
FmtFprintfFloat-4           388ns ± 4%     388ns ± 4%    ~     (p=0.162 n=40+40)
FmtManyArgs-4               612ns ± 3%     616ns ± 4%    ~     (p=0.223 n=40+40)
GobDecode-4                7.35ms ± 5%    7.42ms ± 5%    ~     (p=0.095 n=40+40)
GobEncode-4                7.21ms ± 8%    7.23ms ± 4%    ~     (p=0.294 n=40+40)
Gzip-4                      360ms ± 4%     359ms ± 4%    ~     (p=0.097 n=40+40)
Gunzip-4                   46.1ms ± 3%    45.6ms ± 3%  -1.20%  (p=0.000 n=40+40)
HTTPClientServer-4         64.0µs ± 2%    64.1µs ± 2%    ~     (p=0.648 n=39+40)
JSONEncode-4               21.9ms ± 4%    22.1ms ± 5%    ~     (p=0.086 n=40+40)
JSONDecode-4               67.9ms ± 4%    66.7ms ± 4%  -1.63%  (p=0.000 n=40+40)
Mandelbrot200-4            5.19ms ± 3%    5.17ms ± 3%    ~     (p=0.881 n=40+40)
GoParse-4                  3.34ms ± 3%    3.28ms ± 2%  -1.78%  (p=0.000 n=40+40)
RegexpMatchEasy0_32-4       101ns ± 5%      99ns ± 3%  -2.40%  (p=0.000 n=40+40)
RegexpMatchEasy0_1K-4       851ns ± 1%     848ns ± 3%  -0.36%  (p=0.004 n=33+40)
RegexpMatchEasy1_32-4       109ns ± 5%     105ns ± 3%  -3.53%  (p=0.000 n=39+40)
RegexpMatchEasy1_1K-4      1.03µs ± 4%    1.03µs ± 3%    ~     (p=0.638 n=40+38)
RegexpMatchMedium_32-4      131ns ± 5%     127ns ± 4%  -3.36%  (p=0.000 n=38+40)
RegexpMatchMedium_1K-4     43.4µs ± 4%    43.2µs ± 3%  -0.46%  (p=0.008 n=40+40)
RegexpMatchHard_32-4       2.21µs ± 4%    2.23µs ± 1%  +0.77%  (p=0.014 n=40+28)
RegexpMatchHard_1K-4       67.6µs ± 4%    67.7µs ± 3%  +0.11%  (p=0.016 n=40+40)
Revcomp-4                   1.86s ± 3%     1.77s ± 2%  -4.81%  (p=0.000 n=40+40)
Template-4                 71.7ms ± 3%    71.6ms ± 4%    ~     (p=0.200 n=40+40)
TimeParse-4                 436ns ± 4%     433ns ± 3%    ~     (p=0.358 n=40+40)
TimeFormat-4                413ns ± 4%     412ns ± 3%    ~     (p=0.415 n=40+40)
[Geo mean]                 63.9µs         63.6µs       -0.49%

name                     old speed      new speed      delta
GobDecode-4               105MB/s ± 5%   104MB/s ± 5%    ~     (p=0.096 n=40+40)
GobEncode-4               106MB/s ± 7%   106MB/s ± 3%    ~     (p=0.385 n=39+40)
Gzip-4                   54.0MB/s ± 4%  54.0MB/s ± 4%    ~     (p=0.100 n=40+40)
Gunzip-4                  421MB/s ± 3%   426MB/s ± 3%  +1.21%  (p=0.000 n=40+40)
JSONEncode-4             88.5MB/s ± 5%  88.0MB/s ± 5%    ~     (p=0.083 n=40+40)
JSONDecode-4             28.6MB/s ± 4%  29.1MB/s ± 4%  +1.65%  (p=0.000 n=40+40)
GoParse-4                17.3MB/s ± 3%  17.7MB/s ± 2%  +1.82%  (p=0.000 n=40+40)
RegexpMatchEasy0_32-4     316MB/s ± 5%   323MB/s ± 4%  +2.44%  (p=0.000 n=40+40)
RegexpMatchEasy0_1K-4    1.20GB/s ± 1%  1.21GB/s ± 3%  +0.40%  (p=0.004 n=33+40)
RegexpMatchEasy1_32-4     291MB/s ± 7%   302MB/s ± 4%  +3.82%  (p=0.000 n=40+40)
RegexpMatchEasy1_1K-4     993MB/s ± 4%   990MB/s ± 3%    ~     (p=0.623 n=40+38)
RegexpMatchMedium_32-4   7.61MB/s ± 5%  7.87MB/s ± 4%  +3.36%  (p=0.000 n=38+40)
RegexpMatchMedium_1K-4   23.6MB/s ± 4%  23.7MB/s ± 4%  +0.46%  (p=0.007 n=40+40)
RegexpMatchHard_32-4     14.5MB/s ± 4%  14.3MB/s ± 1%  -0.79%  (p=0.017 n=40+28)
RegexpMatchHard_1K-4     15.1MB/s ± 4%  15.1MB/s ± 3%  -0.11%  (p=0.015 n=40+40)
Revcomp-4                 137MB/s ± 3%   144MB/s ± 3%  +5.06%  (p=0.000 n=40+40)
Template-4               27.1MB/s ± 3%  27.1MB/s ± 4%    ~     (p=0.211 n=40+40)
[Geo mean]               78.9MB/s       79.7MB/s       +1.01%

Change-Id: I638fa4fef85833e8605919d693f9570cc3cf7334
Reviewed-on: https://go-review.googlesource.com/107275
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 		2018-04-16 04:41:20 +00:00
..
alias3.dir
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bench
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chan all: fix article typos 2017-09-15 02:39:16 +00:00
closure3.dir cmd/compile: inline closures with captures 2017-11-05 04:18:05 +00:00
codegen cmd/compile/internal/ssa: optimize 386's subtraction 2018-04-16 04:41:20 +00:00
ddd2.dir
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dwarf
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fixedbugs cmd/compile: fix evaluation of "" < s 2018-04-12 19:38:37 +00:00
import2.dir
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import4.dir
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interface
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intrinsic.dir
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ken
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linkname.dir
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method4.dir
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retjmp.dir cmd/asm: fix assembling return jump 2018-03-01 21:11:16 +00:00
safe
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stress
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syntax cmd/compile: better handling of incorrect type switches 2018-04-03 05:34:20 +00:00
uintptrescapes.dir
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64bit.go
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235.go
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README.md test: use the version of Go used to run run.go 2018-03-03 19:52:00 +00:00
alg.go
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alias.go
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alias1.go
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alias2.go cmd/compile: cleanup method symbol creation 2018-04-05 22:01:17 +00:00
alias3.go
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align.go test: check that unaligned load-add opcodes work. 2018-04-09 18:57:37 +00:00
append.go
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append1.go
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args.go
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armimm.go
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assign.go
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assign1.go
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atomicload.go
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bigalg.go
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bigmap.go
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blank.go
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blank1.go
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bom.go
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bombad.go
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bounds.go
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chancap.go runtime: use sparse mappings for the heap 2018-02-15 21:12:23 +00:00
chanlinear.go
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char_lit.go
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char_lit1.go
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checkbce.go
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clearfat.go
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closedchan.go
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closure.go
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closure1.go
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closure2.go
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closure3.go cmd/compile: fix reassignment check 2017-11-03 20:09:26 +00:00
cmp.go
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cmp6.go
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cmplx.go
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cmplxdivide.c
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cmplxdivide.go
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cmplxdivide1.go
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complit.go
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complit1.go
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compos.go
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const.go
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const1.go cmd/compile: fix constant pointer comparison failure 2018-04-09 23:19:45 +00:00
const2.go
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const3.go
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const4.go
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const5.go
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const6.go
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convT2X.go
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convert.go
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convert1.go
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convert2.go
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convert3.go
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convlit.go
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convlit1.go
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copy.go
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copy1.go
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crlf.go
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ddd.go
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ddd1.go test: reenable ... test 2017-08-11 17:41:17 +00:00
ddd2.go
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decl.go
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declbad.go
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defer.go
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deferfin.go
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deferprint.go
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deferprint.out
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devirt.go
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divide.go
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divmod.go
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empty.go
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env.go
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eof.go
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eof1.go
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errchk test: skip "# package/path" output from cmd/go in errchk 2017-12-13 21:32:01 +00:00
escape.go
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escape2.go test: add missing escape analysis test 2017-08-11 00:56:21 +00:00
escape2n.go test: add missing escape analysis test 2017-08-11 00:56:21 +00:00
escape3.go
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escape4.go cmd/compile: inline calls to local closures 2017-10-11 22:32:36 +00:00
escape5.go cmd/compile: in escape analysis, propagate loop depth to field 2018-04-13 14:48:23 +00:00
escape_array.go cmd/compile: print accurate escape reason for non-const-length slices 2018-03-28 16:56:03 +00:00
escape_because.go test: update list of escape reasons 2018-03-29 14:17:40 +00:00
escape_calls.go
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escape_closure.go
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escape_field.go
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escape_iface.go
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escape_indir.go
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escape_level.go
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escape_map.go
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escape_param.go
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escape_slice.go
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escape_struct_param1.go
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escape_struct_param2.go
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escape_struct_return.go
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fibo.go
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finprofiled.go
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float_lit.go
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float_lit2.go
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float_lit3.go
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floatcmp.go
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for.go
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func.go
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func1.go
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func2.go
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func3.go
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func4.go
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func5.go
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func6.go
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func7.go
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func8.go
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funcdup.go
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funcdup2.go
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gc.go
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gc1.go
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gc2.go
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gcstring.go
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goprint.go
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goprint.out
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goto.go
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heapsampling.go
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helloworld.go
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helloworld.out
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if.go
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import.go
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import1.go
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import2.go
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import4.go
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import5.go
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import6.go
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index.go
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index0.go
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index1.go
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index2.go
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indirect.go
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indirect1.go
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init.go
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init1.go
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initcomma.go
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initialize.go
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initializerr.go
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initloop.go
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inline.go cmd/compile: inline closures with captures 2017-11-05 04:18:05 +00:00
inline_caller.go
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inline_callers.go test: make inline_callers.go test not inline the runtime 2017-11-22 00:52:54 +00:00
inline_literal.go
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inline_variadic.go cmd/compile: enable inlining variadic functions 2018-03-13 20:34:03 +00:00
int_lit.go
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intcvt.go
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intrinsic.go
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intrinsic_atomic.go cmd/compile: intrinsify atomics on MIPS64 2017-10-10 19:43:38 +00:00
iota.go
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label.go
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label1.go
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linkmain.go
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linkmain_run.go
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linkname.go
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linkobj.go
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linkx.go
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linkx_run.go
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literal.go
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live.go cmd/compile: mark the first word of an interface as a uintptr 2018-02-27 22:58:32 +00:00
live1.go
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live2.go cmd/compile: specialize map creation for small hint sizes 2017-11-02 17:03:45 +00:00
live_syscall.go cmd/compile: fix unsafe.Pointer liveness for Syscall-like functions 2017-12-08 21:34:24 +00:00
locklinear.go test: skip locklinear's lockmany test for now 2018-04-05 10:53:40 +00:00
loopbce.go cmd/compile: make loop guard+rotate conditional on GOEXPERIMENT 2017-06-21 22:07:33 +00:00
makechan.go cmd/compile: generate makechan calls with int arguments 2017-08-15 05:54:24 +00:00
makemap.go test: check that size argument errors are emitted at call site 2018-03-14 08:36:15 +00:00
makenew.go
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mallocfin.go
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map.go
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map1.go
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maplinear.go
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mergemul.go cmd/compile: combine x*n - y*n into (x-y)*n 2017-09-03 14:29:38 +00:00
method.go
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method1.go
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method2.go cmd/compile: add two error position tests for the typechecker 2017-10-12 20:50:20 +00:00
method3.go
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method4.go
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method5.go
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method6.go cmd/compile: add two error position tests for the typechecker 2017-10-12 20:50:20 +00:00
method7.go cmd/compile: fix method expressions with anonymous receivers 2018-04-06 15:39:11 +00:00
named.go
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named1.go
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nil.go
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nilcheck.go
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nilptr.go
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nilptr2.go
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nilptr3.go cmd/compile: remove more nil ptr checks after newobject 2017-08-25 03:26:58 +00:00
nilptr4.go
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nosplit.go test: fix and re-enable nosplit.go 2017-10-31 19:12:11 +00:00
notinheap.go
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notinheap2.go
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notinheap3.go cmd/compile: []T where T is go:notinheap does not need write barriers 2017-11-06 21:07:57 +00:00
nowritebarrier.go cmd/compile: improve coverage of nowritebarrierrec check 2017-10-29 19:36:44 +00:00
nul1.go
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opt_branchlikely.go
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parentype.go
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peano.go
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phiopt.go
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print.go cmd/compile: fix print/println when input is uint 2017-09-26 04:08:38 +00:00
print.out cmd/compile: fix print/println when input is uint 2017-09-26 04:08:38 +00:00
printbig.go
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printbig.out
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prove.go cmd/compile: in prove, complete support for OpIsInBounds/OpIsSliceInBounds 2018-04-03 20:25:34 +00:00
range.go cmd/compile: improve single blank variable handling in walkrange 2017-09-12 05:50:54 +00:00
recover.go
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recover1.go
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recover2.go
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recover3.go
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recover4.go all: use Fatalf instead of Fatal if format is given 2018-01-10 01:35:45 +00:00
recover5.go
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reflectmethod1.go
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reflectmethod2.go
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reflectmethod3.go
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reflectmethod4.go
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rename.go
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rename1.go cmd/compile: avoid duplicate cast error 2017-08-22 13:44:35 +00:00
reorder.go
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reorder2.go
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retjmp.go cmd/asm: fix assembling return jump 2018-03-01 21:11:16 +00:00
return.go
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rotate.go
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rotate0.go
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rotate1.go
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rotate2.go
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rotate3.go
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run.go test: small cleanup of code and comments in run.go 2018-04-15 21:17:43 +00:00
rune.go
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runtime.go
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shift1.go cmd/compile: permit indices of certain non-constant shifts 2017-12-01 20:39:50 +00:00
shift2.go
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sieve.go
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sigchld.go
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sigchld.out
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simassign.go
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sinit.go
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sinit_run.go
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sizeof.go
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slice3.go
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slice3err.go
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slicecap.go
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sliceopt.go cmd/compile: make prove pass use unsatisfiability 2018-03-08 22:25:25 +00:00
solitaire.go
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stack.go
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strength.go
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string_lit.go
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stringrange.go
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struct0.go
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switch.go
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switch2.go
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switch3.go
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switch4.go
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switch5.go
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switch6.go
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switch7.go
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tinyfin.go
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torture.go
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turing.go
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typecheck.go
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typecheckloop.go
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typeswitch.go
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typeswitch1.go
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typeswitch2.go
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typeswitch3.go
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uintptrescapes.go
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uintptrescapes2.go cmd/compile: fix go:uintptrescapes tag for unnamed parameters 2018-02-14 21:41:39 +00:00
undef.go
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utf.go
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varerr.go
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varinit.go
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writebarrier.go
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zerodivide.go
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README.md

The test directory contains tests of the Go tool chain and runtime. It includes black box tests, regression tests, and error output tests. They are run as part of all.bash.

To run just these tests, execute:

../bin/go run run.go

Standard library tests should be written as regular Go tests in the appropriate package.

The tool chain and runtime also have regular Go tests in their packages. The main reasons to add a new test to this directory are:

  • it is most naturally expressed using the test runner; or
  • it is also applicable to gccgo and other Go tool chains.