Michael Munday f31a18ded4 cmd/compile: add some generic composite type optimizations ... Propagate values through some wide Zero/Move operations. Among other things this allows us to optimize some kinds of array initialization. For example, the following code no longer requires a temporary be allocated on the stack. Instead it writes the values directly into the return value. func f(i uint32) [4]uint32 { return [4]uint32{i, i+1, i+2, i+3} } The return value is unnecessarily cleared but removing that is probably a task for dead store analysis (I think it needs to be able to match multiple Store ops to wide Zero ops). In order to reliably remove stack variables that are rendered unnecessary by these new rules I've added a new generic version of the unread autos elimination pass. These rules are triggered more than 5000 times when building and testing the standard library. Updates #15925 (fixes for arrays of up to 4 elements). Updates #24386 (fixes for up to 4 kept elements). Updates #24416. compilebench results: name old time/op new time/op delta Template 353ms ± 5% 359ms ± 3% ~ (p=0.143 n=10+10) Unicode 219ms ± 1% 217ms ± 4% ~ (p=0.740 n=7+10) GoTypes 1.26s ± 1% 1.26s ± 2% ~ (p=0.549 n=9+10) Compiler 6.00s ± 1% 6.08s ± 1% +1.42% (p=0.000 n=9+8) SSA 15.3s ± 2% 15.6s ± 1% +2.43% (p=0.000 n=10+10) Flate 237ms ± 2% 240ms ± 2% +1.31% (p=0.015 n=10+10) GoParser 285ms ± 1% 285ms ± 1% ~ (p=0.878 n=8+8) Reflect 797ms ± 3% 807ms ± 2% ~ (p=0.065 n=9+10) Tar 334ms ± 0% 335ms ± 4% ~ (p=0.460 n=8+10) XML 419ms ± 0% 423ms ± 1% +0.91% (p=0.001 n=7+9) StdCmd 46.0s ± 0% 46.4s ± 0% +0.85% (p=0.000 n=9+9) name old user-time/op new user-time/op delta Template 337ms ± 3% 346ms ± 5% ~ (p=0.053 n=9+10) Unicode 205ms ±10% 205ms ± 8% ~ (p=1.000 n=10+10) GoTypes 1.22s ± 2% 1.21s ± 3% ~ (p=0.436 n=10+10) Compiler 5.85s ± 1% 5.93s ± 0% +1.46% (p=0.000 n=10+8) SSA 14.9s ± 1% 15.3s ± 1% +2.62% (p=0.000 n=10+10) Flate 229ms ± 4% 228ms ± 6% ~ (p=0.796 n=10+10) GoParser 271ms ± 3% 275ms ± 4% ~ (p=0.165 n=10+10) Reflect 779ms ± 5% 775ms ± 2% ~ (p=0.971 n=10+10) Tar 317ms ± 4% 319ms ± 5% ~ (p=0.853 n=10+10) XML 404ms ± 4% 409ms ± 5% ~ (p=0.436 n=10+10) name old alloc/op new alloc/op delta Template 34.9MB ± 0% 35.0MB ± 0% +0.26% (p=0.000 n=10+10) Unicode 29.3MB ± 0% 29.3MB ± 0% +0.02% (p=0.000 n=10+10) GoTypes 115MB ± 0% 115MB ± 0% +0.30% (p=0.000 n=10+10) Compiler 519MB ± 0% 521MB ± 0% +0.30% (p=0.000 n=10+10) SSA 1.55GB ± 0% 1.57GB ± 0% +1.34% (p=0.000 n=10+9) Flate 24.1MB ± 0% 24.2MB ± 0% +0.10% (p=0.000 n=10+10) GoParser 28.1MB ± 0% 28.1MB ± 0% +0.07% (p=0.000 n=10+10) Reflect 78.7MB ± 0% 78.7MB ± 0% +0.03% (p=0.000 n=8+10) Tar 34.4MB ± 0% 34.5MB ± 0% +0.12% (p=0.000 n=10+10) XML 43.2MB ± 0% 43.2MB ± 0% +0.13% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Template 330k ± 0% 330k ± 0% -0.01% (p=0.017 n=10+10) Unicode 337k ± 0% 337k ± 0% +0.01% (p=0.000 n=9+10) GoTypes 1.15M ± 0% 1.15M ± 0% +0.03% (p=0.000 n=10+10) Compiler 4.77M ± 0% 4.77M ± 0% +0.03% (p=0.000 n=9+10) SSA 12.5M ± 0% 12.6M ± 0% +1.16% (p=0.000 n=10+10) Flate 221k ± 0% 221k ± 0% +0.05% (p=0.000 n=9+10) GoParser 275k ± 0% 275k ± 0% +0.01% (p=0.014 n=10+9) Reflect 944k ± 0% 944k ± 0% -0.02% (p=0.000 n=10+10) Tar 324k ± 0% 323k ± 0% -0.12% (p=0.000 n=10+10) XML 384k ± 0% 384k ± 0% -0.01% (p=0.001 n=10+10) name old object-bytes new object-bytes delta Template 476kB ± 0% 476kB ± 0% -0.04% (p=0.000 n=10+10) Unicode 218kB ± 0% 218kB ± 0% ~ (all equal) GoTypes 1.58MB ± 0% 1.58MB ± 0% -0.04% (p=0.000 n=10+10) Compiler 6.25MB ± 0% 6.24MB ± 0% -0.09% (p=0.000 n=10+10) SSA 15.9MB ± 0% 16.1MB ± 0% +1.22% (p=0.000 n=10+10) Flate 304kB ± 0% 304kB ± 0% -0.13% (p=0.000 n=10+10) GoParser 370kB ± 0% 370kB ± 0% -0.00% (p=0.000 n=10+10) Reflect 1.27MB ± 0% 1.27MB ± 0% -0.12% (p=0.000 n=10+10) Tar 421kB ± 0% 419kB ± 0% -0.64% (p=0.000 n=10+10) XML 518kB ± 0% 517kB ± 0% -0.12% (p=0.000 n=10+10) name old export-bytes new export-bytes delta Template 16.7kB ± 0% 16.7kB ± 0% ~ (all equal) Unicode 6.52kB ± 0% 6.52kB ± 0% ~ (all equal) GoTypes 29.2kB ± 0% 29.2kB ± 0% ~ (all equal) Compiler 88.0kB ± 0% 88.0kB ± 0% ~ (all equal) SSA 109kB ± 0% 109kB ± 0% ~ (all equal) Flate 4.49kB ± 0% 4.49kB ± 0% ~ (all equal) GoParser 8.10kB ± 0% 8.10kB ± 0% ~ (all equal) Reflect 7.71kB ± 0% 7.71kB ± 0% ~ (all equal) Tar 9.15kB ± 0% 9.15kB ± 0% ~ (all equal) XML 12.3kB ± 0% 12.3kB ± 0% ~ (all equal) name old text-bytes new text-bytes delta HelloSize 676kB ± 0% 672kB ± 0% -0.59% (p=0.000 n=10+10) CmdGoSize 7.26MB ± 0% 7.24MB ± 0% -0.18% (p=0.000 n=10+10) name old data-bytes new data-bytes delta HelloSize 10.2kB ± 0% 10.2kB ± 0% ~ (all equal) CmdGoSize 248kB ± 0% 248kB ± 0% ~ (all equal) name old bss-bytes new bss-bytes delta HelloSize 125kB ± 0% 125kB ± 0% ~ (all equal) CmdGoSize 145kB ± 0% 145kB ± 0% ~ (all equal) name old exe-bytes new exe-bytes delta HelloSize 1.46MB ± 0% 1.45MB ± 0% -0.31% (p=0.000 n=10+10) CmdGoSize 14.7MB ± 0% 14.7MB ± 0% -0.17% (p=0.000 n=10+10) Change-Id: Ic72b0c189dd542f391e1c9ab88a76e9148dc4285 Reviewed-on: https://go-review.googlesource.com/106495 Run-TryBot: Michael Munday <mike.munday@ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>		2018-05-08 10:31:21 +00:00
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bug504.dir	test: add test case that gccgo miscompiled	2017-10-12 19:02:09 +00:00
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issue22877.dir	cmd/compile: make -asmhdr work with type aliases	2017-11-29 20:40:41 +00:00
issue22941.dir	cmd/compile: fix DWARF type symbol buglet	2017-12-01 18:52:50 +00:00
issue22962.dir	cmd/compile: fix bug in DWARF inl handling of unused autos	2017-12-04 18:36:11 +00:00
issue23179.dir	cmd/compile: second attempt at fix for issue 23179	2017-12-20 20:39:16 +00:00
issue24693.dir	cmd/compile: sort method sets using package height	2018-04-10 00:06:06 +00:00
issue24761.dir	cmd/compile: loop to ensure all autogenerated functions are compiled	2018-04-11 23:46:30 +00:00
issue24801.dir	cmd/compile: fix check that ensures main.main is a function	2018-04-10 23:34:12 +00:00
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bug248.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
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bug273.go	runtime: use sparse mappings for the heap	2018-02-15 21:12:23 +00:00
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bug302.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
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bug345.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
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bug369.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
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bug429_run.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
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bug504.go	test: add test case that gccgo miscompiled	2017-10-12 19:02:09 +00:00
bug505.go	test: add type alias test that caused gccgo to crash	2017-10-26 22:52:53 +00:00
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issue4085b.go	cmd/compile: optimize append(x, make([]T, y)...) slice extension	2018-05-06 04:28:23 +00:00
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issue7525.go	cmd/compile: silence unnecessary unsafe error	2017-10-24 02:28:02 +00:00
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issue7525d.go	cmd/compile: silence unnecessary unsafe error	2017-10-24 02:28:02 +00:00
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issue9355.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue9370.go
issue9432.go
issue9521.go
issue9537.go
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issue9604b.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue9608.go
issue9634.go
issue9691.go
issue9731.go
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issue9862_run.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue9862.go
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issue10958.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue10975.go
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issue11053.out
issue11256.go
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issue11656.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue11674.go
issue11699.go
issue11737.go
issue11750.go
issue11771.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue11790.go
issue11945.go
issue11987.go
issue12006.go
issue12108.go
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issue12226.go
issue12347.go
issue12411.go
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issue12525.go
issue12536.go
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issue12588.go
issue12621.go	test: add test for rounding to positive zero	2018-02-14 20:13:05 +00:00
issue12677.go
issue12686.go
issue12944.go
issue13160.go
issue13162.go
issue13169.go
issue13171.go
issue13248.go
issue13261.go
issue13262.go
issue13263.go
issue13265.go	cmd/compile: fix segfault in race instrumentation	2017-10-18 16:46:18 +00:00
issue13266.go
issue13268.go
issue13273.go
issue13274.go
issue13319.go
issue13337.go
issue13365.go
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issue13799.go
issue13821.go
issue13821b.go
issue14006.go
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issue14136.go
issue14164.go
issue14321.go	cmd/compile: better error message when referring to ambiguous method/field	2018-04-10 23:39:13 +00:00
issue14331.go
issue14405.go
issue14520.go
issue14540.go
issue14553.go
issue14591.go
issue14636.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue14646.go
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issue15646.go
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issue15747.go	runtime: remove legacy eager write barrier	2018-02-13 16:34:46 +00:00
issue15747b.go
issue15838.go
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issue15898.go
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issue16037_run.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue16095.go
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issue18902.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue18902b.go
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issue19182.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue19201.go
issue19217.go
issue19246.go
issue19261.go
issue19275.go
issue19323.go
issue19359.go	cmd/compile: avoid mapaccess at m[k]=append(m[k]..	2018-03-20 01:47:07 +00:00
issue19467.go
issue19482.go
issue19507.go
issue19515.go
issue19548.go
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issue19658.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue19667.go
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issue19699b.go
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issue20227.go
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issue20245.go
issue20250.go	runtime: remove legacy eager write barrier	2018-02-13 16:34:46 +00:00
issue20298.go
issue20333.go
issue20335.go
issue20415.go
issue20529.go	cmd/compile: add some generic composite type optimizations	2018-05-08 10:31:21 +00:00
issue20530.go
issue20602.go
issue20682.go
issue20739.go
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issue20923.go	test: add a test that gccgo miscompiled	2018-02-14 20:13:07 +00:00
issue21048.go
issue21120.go
issue21221.go	cmd/compile: fix constant pointer comparison failure	2018-04-09 23:19:45 +00:00
issue21253.go
issue21256.go	cmd/compile, go/types: error if main.main is not a function	2017-11-22 19:14:31 +00:00
issue21273.go	cmd/compile: avoid spurious errors for invalid map key types	2017-11-02 23:53:38 +00:00
issue21317.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue21655.go	cmd/compile: fix large load/store offsets on 386	2017-12-08 03:53:18 +00:00
issue21687.go
issue21709.go	cmd/compile: fix loop depth of range expression in escape analysis	2017-11-30 13:45:18 +00:00
issue21770.go
issue21808.go
issue21808.out
issue21879.go
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issue21882.go
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issue21887.out
issue21963.go
issue21988.go
issue22063.go
issue22076.go
issue22083.go
issue22164.go	cmd/compile/internal/syntax: better recovery after missing closing parentheses	2017-10-17 01:04:56 +00:00
issue22198.go
issue22200.go
issue22200b.go
issue22305.go	test: add new test that gccgo failed to compile	2018-02-15 03:37:20 +00:00
issue22351.go	cmd/compile: silence unnecessary unsafe error	2017-10-24 02:28:02 +00:00
issue22389.go	cmd/compile: test for omitted ICE diagnostics after normal messages	2017-11-06 08:37:30 +00:00
issue22429.go	cmd/compile: make sure not to use SP as an index register	2017-10-26 02:45:05 +00:00
issue22458.go	cmd/compile: fix runtime.KeepAlive	2017-10-30 19:55:02 +00:00
issue22581.go	cmd/compile/internal/syntax: better syntax errors for typos in if/switch/for headers	2017-11-06 23:17:24 +00:00
issue22605.go	cmd/compile: don't put Noalg types in typelinks	2017-11-07 22:29:48 +00:00
issue22660.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue22662.go	cmd/compile: track line directives w/ column information	2018-02-26 18:32:03 +00:00
issue22662b.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue22683.go	cmd/compile: add test for array decomposition	2017-11-13 20:22:22 +00:00
issue22683.out	cmd/compile: add test for array decomposition	2017-11-13 20:22:22 +00:00
issue22781.go	cmd/compile: fix mapassign_fast* routines for pointer keys	2017-11-22 04:30:27 +00:00
issue22794.go	cmd/compile: hint on wrong case-field names in composite literals	2017-11-20 20:29:43 +00:00
issue22822.go	cmd/compile: improved error message when calling a shadowed builtin	2018-02-28 19:39:52 +00:00
issue22877.go	cmd/compile: make -asmhdr work with type aliases	2017-11-29 20:40:41 +00:00
issue22881.go	cmd/compile: avoid mapaccess at m[k]=append(m[k]..	2018-03-20 01:47:07 +00:00
issue22904.go	cmd/compile: fix infinite recursion in isdirectiface	2017-11-28 21:58:16 +00:00
issue22941.go	cmd/compile: fix DWARF type symbol buglet	2017-12-01 18:52:50 +00:00
issue22962.go	cmd/compile: fix bug in DWARF inl handling of unused autos	2017-12-04 18:36:11 +00:00
issue23093.go	cmd/compile: remove broken inlining accounting code	2017-12-12 20:26:33 +00:00
issue23116.go	cmd/compile: reject type switch with guarded declaration and no cases	2018-03-13 22:02:46 +00:00
issue23179.go	cmd/compile: fix corner case in DWARF inline info generation	2017-12-19 19:00:42 +00:00
issue23298.go	cmd/compile: allow converting defined string types to []rune	2018-02-15 00:25:21 +00:00
issue23305.go	cmd/compile: disable "redundant zeroextensions" optimization for Select on AMD64	2018-01-02 21:08:35 +00:00
issue23414.go	cmd/compile: fix typechecking of untyped boolean expressions	2018-02-15 01:00:06 +00:00
issue23489.go	test: add test case for incorrect gccgo compilation error	2018-02-14 20:13:22 +00:00
issue23504.go	cmd/compile: reset branch prediction when deleting a branch	2018-02-20 00:56:13 +00:00
issue23521.go	cmd/compile: make DCE remove nodes after terminating if	2018-04-03 15:19:41 +00:00
issue23522.go	cmd/compile: don't let spills clobber arguments	2018-01-23 21:51:55 +00:00
issue23545.go	test: add test for gccgo bug 23545	2018-01-31 20:03:31 +00:00
issue23586.go	cmd/compile/internal/syntax: more tolerant handling of missing function invocation in go/defer	2018-02-15 01:48:16 +00:00
issue23587.go	cmd/compile/internal/syntax: don't assume (operator) ~ means operator ^	2018-02-15 16:41:24 +00:00
issue23609.go	cmd/compile: improve compiler error on embedded structs	2018-03-06 21:06:46 +00:00
issue23664.go	cmd/compile/internal/syntax: better error message for incorrect if/switch header	2018-04-03 21:57:37 +00:00
issue23719.go	cmd/compile: use unsigned loads for multi-element comparisons	2018-02-06 18:24:33 +00:00
issue23732.go	cmd/compile: report the struct type in invalid number of initializer values	2018-02-13 19:42:15 +00:00
issue23812.go	cmd/compile: fix constant folding of right shifts	2018-02-14 00:03:36 +00:00
issue23912.go	test: add test case where gccgo incorrectly rejected aliases	2018-02-20 01:57:14 +00:00
issue24120.go	cmd/compile: fix inlining of constant if statements	2018-02-27 19:27:32 +00:00
issue24159.go	cmd/compile: prevent detection of wrong duplicates	2018-03-07 01:26:00 +00:00
issue24173.go	cmd/compile: fix unexpected type alias crash	2018-02-28 20:18:37 +00:00
issue24187.go	runtime: fix amd64p32 indexbytes in presence of overflow	2018-03-01 16:53:33 +00:00
issue24339.go	cmd/compile: use key position for key:val elements in composite literals	2018-03-13 21:44:12 +00:00
issue24449.go	cmd/compile: mark LAA and LAAG as clobbering flags on s390x	2018-03-20 09:44:50 +00:00
issue24470.go	cmd/compile: better handling of incorrect type switches	2018-04-03 05:34:20 +00:00
issue24503.go	cmd/compile/internal/ssa: handle symbol address comparisons consistently	2018-03-31 21:37:13 +00:00
issue24547.go	cmd/compile: fix method set computation for shadowed methods	2018-03-27 18:56:36 +00:00
issue24693.go	cmd/compile: sort method sets using package height	2018-04-10 00:06:06 +00:00
issue24693.out	cmd/compile: sort method sets using package height	2018-04-10 00:06:06 +00:00
issue24761.go	cmd/compile: loop to ensure all autogenerated functions are compiled	2018-04-11 23:46:30 +00:00
issue24799.go	cmd/compile: generate load without DS relocation for go.string on ppc64le	2018-04-20 16:16:47 +00:00
issue24801.go	cmd/compile: fix check that ensures main.main is a function	2018-04-10 23:34:12 +00:00
issue24817.go	cmd/compile: fix evaluation of "" < s	2018-04-12 19:38:37 +00:00
issue24937.go	cmd/compile: avoid runtime call during switch string(byteslice)	2018-04-21 00:50:50 +00:00
issue25006.go	cmd/compile/internal/ssa: fix endless compile loop on AMD64	2018-04-24 16:20:41 +00:00