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Jake Ciolek 6cf1d5d0fa cmd/compile: generic SSA rules for simplifying 2 and 3 operand integer arithmetic expressions 
This applies the following generic integer addition/subtraction transformations:

x - (x + y) = -y
(x - y) - x = -y
y + (x - y) = x
y + (z + (x - y) = x + z

There's over 40 unique functions matching in Go. Hits 2 funcs in the runtime itself:

runtime.stackfree()
runtime.runqdrain()

Go binary size reduced by 0.05% on Linux x86_64.

StackCopy bench (perflocked Cascade Lake x86):

name                old time/op  new time/op  delta
StackCopyPtr-8      87.3ms ± 1%  86.9ms ± 0%  -0.45%  (p=0.000 n=20+20)
StackCopy-8         77.6ms ± 1%  77.0ms ± 0%  -0.76%  (p=0.000 n=20+20)
StackCopyNoCache-8  2.28ms ± 2%  2.26ms ± 2%  -0.93%  (p=0.008 n=19+20)

test/bench/go1 benchmarks (perflocked Cascade Lake x86):

name                     old time/op    new time/op    delta
BinaryTree17-8              1.88s ± 1%     1.88s ± 0%    ~     (p=0.373 n=15+12)
Fannkuch11-8                2.31s ± 0%     2.35s ± 0%  +1.52%  (p=0.000 n=15+14)
FmtFprintfEmpty-8          26.6ns ± 0%    26.6ns ± 0%    ~     (p=0.081 n=14+13)
FmtFprintfString-8         48.6ns ± 0%    50.0ns ± 0%  +2.86%  (p=0.000 n=15+14)
FmtFprintfInt-8            56.9ns ± 0%    54.8ns ± 0%  -3.70%  (p=0.000 n=15+15)
FmtFprintfIntInt-8         90.4ns ± 0%    88.8ns ± 0%  -1.78%  (p=0.000 n=15+15)
FmtFprintfPrefixedInt-8     104ns ± 0%     104ns ± 0%    ~     (p=0.905 n=14+13)
FmtFprintfFloat-8           148ns ± 0%     144ns ± 0%  -2.19%  (p=0.000 n=14+15)
FmtManyArgs-8               389ns ± 0%     390ns ± 0%  +0.35%  (p=0.000 n=12+15)
GobDecode-8                3.90ms ± 1%    3.88ms ± 0%  -0.49%  (p=0.000 n=15+14)
GobEncode-8                2.73ms ± 0%    2.73ms ± 0%    ~     (p=0.425 n=15+14)
Gzip-8                      169ms ± 0%     168ms ± 0%  -0.52%  (p=0.000 n=13+13)
Gunzip-8                   24.7ms ± 0%    24.8ms ± 0%  +0.61%  (p=0.000 n=15+15)
HTTPClientServer-8         60.5µs ± 6%    60.4µs ± 7%    ~     (p=0.595 n=15+15)
JSONEncode-8               6.97ms ± 1%    6.93ms ± 0%  -0.69%  (p=0.000 n=14+14)
JSONDecode-8               31.2ms ± 1%    30.8ms ± 1%  -1.27%  (p=0.000 n=14+14)
Mandelbrot200-8            3.87ms ± 0%    3.87ms ± 0%    ~     (p=0.652 n=15+14)
GoParse-8                  2.65ms ± 2%    2.64ms ± 1%    ~     (p=0.202 n=15+15)
RegexpMatchEasy0_32-8      45.1ns ± 0%    45.9ns ± 0%  +1.68%  (p=0.000 n=14+15)
RegexpMatchEasy0_1K-8       140ns ± 0%     139ns ± 0%  -0.44%  (p=0.000 n=15+14)
RegexpMatchEasy1_32-8      40.9ns ± 3%    40.5ns ± 0%  -0.88%  (p=0.000 n=15+13)
RegexpMatchEasy1_1K-8       215ns ± 1%     220ns ± 1%  +2.27%  (p=0.000 n=15+15)
RegexpMatchMedium_32-8      783ns ± 7%     738ns ± 0%    ~     (p=0.361 n=15+15)
RegexpMatchMedium_1K-8     24.1µs ± 6%    23.4µs ± 6%  -2.94%  (p=0.004 n=15+15)
RegexpMatchHard_32-8       1.10µs ± 1%    1.09µs ± 1%  -0.40%  (p=0.006 n=15+14)
RegexpMatchHard_1K-8       33.0µs ± 0%    33.0µs ± 0%    ~     (p=0.535 n=12+14)
Revcomp-8                   354ms ± 0%     353ms ± 0%  -0.23%  (p=0.002 n=15+13)
Template-8                 42.0ms ± 1%    41.8ms ± 2%  -0.37%  (p=0.023 n=14+15)
TimeParse-8                 181ns ± 0%     180ns ± 1%  -0.18%  (p=0.014 n=12+13)
TimeFormat-8                240ns ± 0%     242ns ± 1%  +0.69%  (p=0.000 n=12+15)
[Geo mean]                 35.2µs         35.1µs       -0.43%

name                     old speed      new speed      delta
GobDecode-8               197MB/s ± 1%   198MB/s ± 0%  +0.49%  (p=0.000 n=15+14)
GobEncode-8               281MB/s ± 0%   281MB/s ± 0%    ~     (p=0.419 n=15+14)
Gzip-8                    115MB/s ± 0%   115MB/s ± 0%  +0.52%  (p=0.000 n=13+13)
Gunzip-8                  786MB/s ± 0%   781MB/s ± 0%  -0.60%  (p=0.000 n=15+15)
JSONEncode-8              278MB/s ± 1%   280MB/s ± 0%  +0.69%  (p=0.000 n=14+14)
JSONDecode-8             62.3MB/s ± 1%  63.1MB/s ± 1%  +1.29%  (p=0.000 n=14+14)
GoParse-8                21.9MB/s ± 2%  22.0MB/s ± 1%    ~     (p=0.205 n=15+15)
RegexpMatchEasy0_32-8     709MB/s ± 0%   697MB/s ± 0%  -1.65%  (p=0.000 n=14+15)
RegexpMatchEasy0_1K-8    7.34GB/s ± 0%  7.37GB/s ± 0%  +0.43%  (p=0.000 n=15+15)
RegexpMatchEasy1_32-8     783MB/s ± 2%   790MB/s ± 0%  +0.88%  (p=0.000 n=15+13)
RegexpMatchEasy1_1K-8    4.77GB/s ± 1%  4.66GB/s ± 1%  -2.23%  (p=0.000 n=15+15)
RegexpMatchMedium_32-8   41.0MB/s ± 7%  43.3MB/s ± 0%    ~     (p=0.360 n=15+15)
RegexpMatchMedium_1K-8   42.5MB/s ± 6%  43.8MB/s ± 6%  +3.07%  (p=0.004 n=15+15)
RegexpMatchHard_32-8     29.2MB/s ± 1%  29.3MB/s ± 1%  +0.41%  (p=0.006 n=15+14)
RegexpMatchHard_1K-8     31.1MB/s ± 0%  31.1MB/s ± 0%    ~     (p=0.495 n=12+14)
Revcomp-8                 718MB/s ± 0%   720MB/s ± 0%  +0.23%  (p=0.002 n=15+13)
Template-8               46.3MB/s ± 1%  46.4MB/s ± 2%  +0.38%  (p=0.021 n=14+15)
[Geo mean]                205MB/s        206MB/s       +0.57%

Change-Id: Ibd1afdf8b6c0b08087dcc3acd8f943637eb95ac0
Reviewed-on: https://go-review.googlesource.com/c/go/+/344930
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
 		2021-08-25 19:45:20 +00:00
..
abi cmd/compile: set unsayable "names" for regabi testing triggers 2021-05-06 11:58:39 +00:00
alias3.dir
…
bench test/bench/go1: fix size for RegexpMatchMedium_32 2021-07-18 21:03:43 +00:00
chan [dev.typeparams] cmd/compile/internal/types2: implement close(ch) where ch is of type parameter type 2021-07-14 23:33:46 +00:00
closure3.dir cmd/compile: don't emit inltree for closure within body of inlined func 2021-05-18 20:04:57 +00:00
closure5.dir [dev.regabi] cmd/compile: exporting, importing, and inlining functions with OCLOSURE 2021-01-20 22:53:32 +00:00
codegen cmd/compile: generic SSA rules for simplifying 2 and 3 operand integer arithmetic expressions 2021-08-25 19:45:20 +00:00
ddd2.dir
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dwarf
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fixedbugs test: add test that caused gofrontend compiler crash 2021-08-25 03:13:06 +00:00
import2.dir
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import4.dir
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interface
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intrinsic.dir
…
ken
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linkname.dir
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method4.dir
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oldescape_linkname.dir
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retjmp.dir
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runtime
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stress all: update references to symbols moved from io/ioutil to io 2021-04-05 17:51:15 +00:00
syntax test/syntax: remove interface.go 2021-04-06 18:55:39 +00:00
typeparam cmd/compile: fix function contains no TParam in generic function 2021-08-25 19:06:16 +00:00
uintptrescapes.dir
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64bit.go
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235.go
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README.md
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alg.go
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alias.go
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alias1.go
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alias2.go
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alias3.go
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align.go
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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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cannotassign.go
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chancap.go [dev.regabi] cmd/compile: remove toolstash scaffolding 2021-01-05 21:44:30 +00:00
chanlinear.go
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char_lit.go
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char_lit1.go cmd/compile: do not report error for invalid constant 2021-03-05 18:46:43 +00:00
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 [dev.regabi] test: add another closure test case 2021-01-01 13:44:37 +00:00
closure3.go cmd/compile: disable inlining functions with closures for now 2021-02-24 21:34:21 +00:00
closure4.go
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closure5.go [dev.regabi] cmd/compile: exporting, importing, and inlining functions with OCLOSURE 2021-01-20 22:53:32 +00:00
closure6.go [dev.regabi] cmd/compile: fix escape analysis problem with closures 2021-01-23 02:15:24 +00:00
closure7.go [dev.regabi] test: add a test for inlining closures 2021-02-01 18:28:05 +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 test: fix error check messages for 2 types2 tests 2021-06-02 05:14:45 +00:00
compos.go
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const.go
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const1.go
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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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const7.go [dev.typeparams] cmd/compile: refuse excessively long constants 2021-02-03 20:22:34 +00:00
convT2X.go
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convert.go
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convert1.go
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convert2.go cmd/compile: allow conversion from slice to array ptr 2021-04-21 00:53:48 +00:00
convert3.go
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convert4.go cmd/compile: allow conversion from slice to array ptr 2021-04-21 00:53:48 +00:00
convlit.go cmd/compile/internal/types2: refactor untyped conversions 2021-03-23 05:11:09 +00:00
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: fix error check messages for 2 types2 tests 2021-06-02 05:14:45 +00:00
ddd2.go
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decl.go
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declbad.go cmd/compile: rewrite a, b = f() to use temporaries when type not identical 2021-06-14 07:12:37 +00:00
defer.go
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defererrcheck.go
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deferfin.go [dev.regabi] test: enable finalizer tests on !amd64 2021-01-05 21:11:31 +00:00
defernil.go
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deferprint.go
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deferprint.out
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devirt.go [dev.typeparams] cmd/compile: simplify interface conversions 2021-08-09 16:10:20 +00:00
directive.go
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divide.go
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divmod.go
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embedfunc.go cmd/compile: require 'go 1.16' go.mod line for //go:embed 2021-01-19 20:07:52 +00:00
embedvers.go cmd/compile: require 'go 1.16' go.mod line for //go:embed 2021-01-19 20:07:52 +00:00
empty.go
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env.go
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eof.go
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eof1.go
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escape.go
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escape2.go [dev.typeparams] cmd/compile: move call logic from order.go to escape 2021-06-23 16:48:12 +00:00
escape2n.go [dev.typeparams] cmd/compile: move call logic from order.go to escape 2021-06-23 16:48:12 +00:00
escape3.go
…
escape4.go [dev.regabi] cmd/compile: convert OPANIC argument to interface{} during typecheck 2021-01-18 05:55:08 +00:00
escape5.go [dev.typeparams] test: rename blank functions 2021-07-28 21:41:07 +00:00
escape_array.go [dev.typeparams] cmd/compile: simplify ~r/~b naming 2021-05-26 23:50:32 +00:00
escape_calls.go [dev.typeparams] cmd/compile: simplify ~r/~b naming 2021-05-26 23:50:32 +00:00
escape_closure.go [dev.typeparams] cmd/compile: simplify ~r/~b naming 2021-05-26 23:50:32 +00:00
escape_field.go
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escape_goto.go [dev.typeparams] test: rename blank functions 2021-07-28 21:41:07 +00:00
escape_hash_maphash.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 [dev.typeparams] cmd/compile: simplify ~r/~b naming 2021-05-26 23:50:32 +00:00
escape_runtime_atomic.go [dev.typeparams] cmd/compile: simplify ~r/~b naming 2021-05-26 23:50:32 +00:00
escape_selfassign.go
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escape_slice.go [dev.typeparams] cmd/compile: simplify ~r/~b naming 2021-05-26 23:50:32 +00:00
escape_struct_param1.go
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escape_struct_param2.go
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escape_struct_return.go [dev.typeparams] cmd/compile: simplify ~r/~b naming 2021-05-26 23:50:32 +00:00
escape_sync_atomic.go
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escape_unsafe.go [dev.typeparams] cmd/compile: simplify ~r/~b naming 2021-05-26 23:50:32 +00:00
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 [dev.regabi] cmd/compile: enable rational constant arithmetic 2021-01-25 18:53:24 +00:00
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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fuse.go test: do not run fuse test in noopt mode 2021-04-28 15:55:10 +00:00
gc.go
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gc1.go
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gc2.go
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gcgort.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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initempty.go
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initexp.go cmd/compile: fix exponential-time init-cycle reporting 2021-01-08 17:14:20 +00:00
initialize.go
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initializerr.go
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initloop.go
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inline.go [dev.typeparams] test: rename blank functions 2021-07-28 21:41:07 +00:00
inline_big.go [dev.typeparams] cmd/compile/internal/inline: refactor mkinlcall 2021-05-27 23:40:56 +00:00
inline_caller.go
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inline_callers.go
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inline_literal.go
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inline_math_bits_rotate.go
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inline_sync.go
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inline_variadic.go [dev.typeparams] cmd/compile: simplify inlining variadic calls 2021-05-26 23:50:45 +00:00
int_lit.go
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intcvt.go
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intrinsic.go
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intrinsic_atomic.go
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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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linkname2.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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literal2.go
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live.go [dev.typeparams] cmd/compile: simplify interface conversions 2021-08-09 16:10:20 +00:00
live1.go
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live2.go
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live_regabi.go test: enable regabi test on arm64 2021-08-20 19:58:13 +00:00
live_syscall.go
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locklinear.go
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loopbce.go
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mainsig.go
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makechan.go cmd/compile/internal/types2: add unsafe.Add and unsafe.Slice 2021-04-23 00:41:01 +00:00
makemap.go cmd/compile/internal/types2: add unsafe.Add and unsafe.Slice 2021-04-23 00:41:01 +00:00
makenew.go
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makeslice.go
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mallocfin.go
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map.go
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map1.go
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mapclear.go
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maplinear.go
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mergemul.go
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method.go
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method1.go
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method2.go
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method3.go
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method4.go
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method5.go
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method6.go
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method7.go [dev.typeparams] cmd/compile: fix MethodExpr handling with embedded fields 2021-01-26 17:05:06 +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 test: disable nilptr on windows/arm64 2021-02-19 00:40:22 +00:00
nilptr2.go
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nilptr3.go [dev.regabi] cmd/compile: deref PAUTOHEAPs during SSA construction 2021-01-10 08:01:49 +00:00
nilptr4.go
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nilptr5.go
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nilptr5_aix.go
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nilptr5_wasm.go
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nilptr_aix.go
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nosplit.go test: make nosplit test invariant to ABI wrappers 2021-03-18 16:51:25 +00:00
notinheap.go
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notinheap2.go
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notinheap3.go
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nowritebarrier.go
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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 cmd/compile/internal/ssa: strengthen phiopt pass 2021-03-29 05:50:11 +00:00
print.go
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print.out
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printbig.go
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printbig.out
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prove.go docs: fix spelling 2021-02-24 04:11:43 +00:00
range.go
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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
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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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reflectmethod5.go
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reflectmethod6.go
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reflectmethod7.go cmd/compile: mark concrete call of reflect.(*rtype).Method as REFLECTMETHOD 2021-02-10 22:44:54 +00:00
reflectmethod8.go [dev.typeparams] cmd/compile: fix missing condition in usemethod 2021-07-22 17:48:41 +00:00
rename.go
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rename1.go
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reorder.go [dev.regabi] cmd/compile: cleanup OAS2FUNC ordering 2021-01-16 23:19:26 +00:00
reorder2.go
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retjmp.go
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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 cmd/compile: fixing 15.go for -G=3 2021-08-23 16:57:27 +00:00
rune.go
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runtime.go
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shift1.go
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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
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solitaire.go
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stack.go
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stackobj.go
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stackobj2.go
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stackobj3.go
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strcopy.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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typeswitch2b.go
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typeswitch3.go
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uintptrescapes.go
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uintptrescapes2.go [dev.typeparams] cmd/compile: skip escape analysis diagnostics for wrappers 2021-06-24 18:24:24 +00:00
uintptrescapes3.go
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undef.go
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unsafebuiltins.go cmd/compile,runtime: change unsafe.Slice((*T)(nil), 0) to return []T(nil) 2021-06-28 23:31:13 +00:00
used.go [dev.typeparams] all: merge dev.regabi (07569da) into dev.typeparams 2020-12-28 00:39:17 -08:00
utf.go
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varerr.go
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varinit.go
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winbatch.go
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writebarrier.go cmd/compile: don't emit write barriers for offsets of global addresses 2021-08-23 19:46:36 +00:00
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

To run just tests from specified files in this directory, execute:

../bin/go run run.go -- file1.go file2.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.