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go/test/inline_big.go
Than McIntosh 733ba92187 cmd/compile: flag 'large' functions when -m=2+ in effect 
When -m=N (where N > 1) is in effect, include a note in the trace
output if a given function is considered "big" during inlining
analysis, since this causes the inliner to be less aggressive. If a
small change to a large function happens to nudge it over the large
function threshold, it can be confusing for developers, thus it's
probably worth including this info in the remark output.

Change-Id: Id31a1b76371ab1ef9265ba28a377f97b0247d0a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/460317
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Keith Randall <khr@google.com>
2023-01-24 13:28:54 +00:00

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// errorcheck -0 -m=2
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Test that we restrict inlining into very large functions.
// See issue #26546.
package foo
func small(a []int) int { // ERROR "can inline small with cost .* as:.*" "a does not escape"
// Cost 16 body (need cost < 20).
// See cmd/compile/internal/gc/inl.go:inlineBigFunction*
return a[0] + a[1] + a[2] + a[3]
}
func medium(a []int) int { // ERROR "can inline medium with cost .* as:.*" "a does not escape"
// Cost 32 body (need cost > 20 and cost < 80).
// See cmd/compile/internal/gc/inl.go:inlineBigFunction*
return a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6] + a[7]
}
func f(a []int) int { // ERROR "cannot inline f:.*" "a does not escape" "function f considered 'big'"
// Add lots of nodes to f's body. We need >5000.
// See cmd/compile/internal/gc/inl.go:inlineBigFunction*
a[0] = 0
a[1] = 0
a[2] = 0
a[3] = 0
a[4] = 0
a[5] = 0
a[6] = 0
a[7] = 0
a[8] = 0
a[9] = 0
a[10] = 0
a[11] = 0
a[12] = 0
a[13] = 0
a[14] = 0
a[15] = 0
a[16] = 0
a[17] = 0
a[18] = 0
a[19] = 0
a[20] = 0
a[21] = 0
a[22] = 0
a[23] = 0
a[24] = 0
a[25] = 0
a[26] = 0
a[27] = 0
a[28] = 0
a[29] = 0
a[30] = 0
a[31] = 0
a[32] = 0
a[33] = 0
a[34] = 0
a[35] = 0
a[36] = 0
a[37] = 0
a[38] = 0
a[39] = 0
a[40] = 0
a[41] = 0
a[42] = 0
a[43] = 0
a[44] = 0
a[45] = 0
a[46] = 0
a[47] = 0
a[48] = 0
a[49] = 0
a[50] = 0
a[51] = 0
a[52] = 0
a[53] = 0
a[54] = 0
a[55] = 0
a[56] = 0
a[57] = 0
a[58] = 0
a[59] = 0
a[60] = 0
a[61] = 0
a[62] = 0
a[63] = 0
a[64] = 0
a[65] = 0
a[66] = 0
a[67] = 0
a[68] = 0
a[69] = 0
a[70] = 0
a[71] = 0
a[72] = 0
a[73] = 0
a[74] = 0
a[75] = 0
a[76] = 0
a[77] = 0
a[78] = 0
a[79] = 0
a[80] = 0
a[81] = 0
a[82] = 0
a[83] = 0
a[84] = 0
a[85] = 0
a[86] = 0
a[87] = 0
a[88] = 0
a[89] = 0
a[90] = 0
a[91] = 0
a[92] = 0
a[93] = 0
a[94] = 0
a[95] = 0
a[96] = 0
a[97] = 0
a[98] = 0
a[99] = 0
a[100] = 0
a[101] = 0
a[102] = 0
a[103] = 0
a[104] = 0
a[105] = 0
a[106] = 0
a[107] = 0
a[108] = 0
a[109] = 0
a[110] = 0
a[111] = 0
a[112] = 0
a[113] = 0
a[114] = 0
a[115] = 0
a[116] = 0
a[117] = 0
a[118] = 0
a[119] = 0
a[120] = 0
a[121] = 0
a[122] = 0
a[123] = 0
a[124] = 0
a[125] = 0
a[126] = 0
a[127] = 0
a[128] = 0
a[129] = 0
a[130] = 0
a[131] = 0
a[132] = 0
a[133] = 0
a[134] = 0
a[135] = 0
a[136] = 0
a[137] = 0
a[138] = 0
a[139] = 0
a[140] = 0
a[141] = 0
a[142] = 0
a[143] = 0
a[144] = 0
a[145] = 0
a[146] = 0
a[147] = 0
a[148] = 0
a[149] = 0
a[150] = 0
a[151] = 0
a[152] = 0
a[153] = 0
a[154] = 0
a[155] = 0
a[156] = 0
a[157] = 0
a[158] = 0
a[159] = 0
a[160] = 0
a[161] = 0
a[162] = 0
a[163] = 0
a[164] = 0
a[165] = 0
a[166] = 0
a[167] = 0
a[168] = 0
a[169] = 0
a[170] = 0
a[171] = 0
a[172] = 0
a[173] = 0
a[174] = 0
a[175] = 0
a[176] = 0
a[177] = 0
a[178] = 0
a[179] = 0
a[180] = 0
a[181] = 0
a[182] = 0
a[183] = 0
a[184] = 0
a[185] = 0
a[186] = 0
a[187] = 0
a[188] = 0
a[189] = 0
a[190] = 0
a[191] = 0
a[192] = 0
a[193] = 0
a[194] = 0
a[195] = 0
a[196] = 0
a[197] = 0
a[198] = 0
a[199] = 0
a[200] = 0
a[201] = 0
a[202] = 0
a[203] = 0
a[204] = 0
a[205] = 0
a[206] = 0
a[207] = 0
a[208] = 0
a[209] = 0
a[210] = 0
a[211] = 0
a[212] = 0
a[213] = 0
a[214] = 0
a[215] = 0
a[216] = 0
a[217] = 0
a[218] = 0
a[219] = 0
a[220] = 0
a[221] = 0
a[222] = 0
a[223] = 0
a[224] = 0
a[225] = 0
a[226] = 0
a[227] = 0
a[228] = 0
a[229] = 0
a[230] = 0
a[231] = 0
a[232] = 0
a[233] = 0
a[234] = 0
a[235] = 0
a[236] = 0
a[237] = 0
a[238] = 0
a[239] = 0
a[240] = 0
a[241] = 0
a[242] = 0
a[243] = 0
a[244] = 0
a[245] = 0
a[246] = 0
a[247] = 0
a[248] = 0
a[249] = 0
a[250] = 0
a[251] = 0
a[252] = 0
a[253] = 0
a[254] = 0
a[255] = 0
a[256] = 0
a[257] = 0
a[258] = 0
a[259] = 0
a[260] = 0
a[261] = 0
a[262] = 0
a[263] = 0
a[264] = 0
a[265] = 0
a[266] = 0
a[267] = 0
a[268] = 0
a[269] = 0
a[270] = 0
a[271] = 0
a[272] = 0
a[273] = 0
a[274] = 0
a[275] = 0
a[276] = 0
a[277] = 0
a[278] = 0
a[279] = 0
a[280] = 0
a[281] = 0
a[282] = 0
a[283] = 0
a[284] = 0
a[285] = 0
a[286] = 0
a[287] = 0
a[288] = 0
a[289] = 0
a[290] = 0
a[291] = 0
a[292] = 0
a[293] = 0
a[294] = 0
a[295] = 0
a[296] = 0
a[297] = 0
a[298] = 0
a[299] = 0
a[300] = 0
a[301] = 0
a[302] = 0
a[303] = 0
a[304] = 0
a[305] = 0
a[306] = 0
a[307] = 0
a[308] = 0
a[309] = 0
a[310] = 0
a[311] = 0
a[312] = 0
a[313] = 0
a[314] = 0
a[315] = 0
a[316] = 0
a[317] = 0
a[318] = 0
a[319] = 0
a[320] = 0
a[321] = 0
a[322] = 0
a[323] = 0
a[324] = 0
a[325] = 0
a[326] = 0
a[327] = 0
a[328] = 0
a[329] = 0
a[330] = 0
a[331] = 0
a[332] = 0
a[333] = 0
a[334] = 0
a[335] = 0
a[336] = 0
a[337] = 0
a[338] = 0
a[339] = 0
a[340] = 0
a[341] = 0
a[342] = 0
a[343] = 0
a[344] = 0
a[345] = 0
a[346] = 0
a[347] = 0
a[348] = 0
a[349] = 0
a[350] = 0
a[351] = 0
a[352] = 0
a[353] = 0
a[354] = 0
a[355] = 0
a[356] = 0
a[357] = 0
a[358] = 0
a[359] = 0
a[360] = 0
a[361] = 0
a[362] = 0
a[363] = 0
a[364] = 0
a[365] = 0
a[366] = 0
a[367] = 0
a[368] = 0
a[369] = 0
a[370] = 0
a[371] = 0
a[372] = 0
a[373] = 0
a[374] = 0
a[375] = 0
a[376] = 0
a[377] = 0
a[378] = 0
a[379] = 0
a[380] = 0
a[381] = 0
a[382] = 0
a[383] = 0
a[384] = 0
a[385] = 0
a[386] = 0
a[387] = 0
a[388] = 0
a[389] = 0
a[390] = 0
a[391] = 0
a[392] = 0
a[393] = 0
a[394] = 0
a[395] = 0
a[396] = 0
a[397] = 0
a[398] = 0
a[399] = 0
a[400] = 0
a[401] = 0
a[402] = 0
a[403] = 0
a[404] = 0
a[405] = 0
a[406] = 0
a[407] = 0
a[408] = 0
a[409] = 0
a[410] = 0
a[411] = 0
a[412] = 0
a[413] = 0
a[414] = 0
a[415] = 0
a[416] = 0
a[417] = 0
a[418] = 0
a[419] = 0
a[420] = 0
a[421] = 0
a[422] = 0
a[423] = 0
a[424] = 0
a[425] = 0
a[426] = 0
a[427] = 0
a[428] = 0
a[429] = 0
a[430] = 0
a[431] = 0
a[432] = 0
a[433] = 0
a[434] = 0
a[435] = 0
a[436] = 0
a[437] = 0
a[438] = 0
a[439] = 0
a[440] = 0
a[441] = 0
a[442] = 0
a[443] = 0
a[444] = 0
a[445] = 0
a[446] = 0
a[447] = 0
a[448] = 0
a[449] = 0
a[450] = 0
a[451] = 0
a[452] = 0
a[453] = 0
a[454] = 0
a[455] = 0
a[456] = 0
a[457] = 0
a[458] = 0
a[459] = 0
a[460] = 0
a[461] = 0
a[462] = 0
a[463] = 0
a[464] = 0
a[465] = 0
a[466] = 0
a[467] = 0
a[468] = 0
a[469] = 0
a[470] = 0
a[471] = 0
a[472] = 0
a[473] = 0
a[474] = 0
a[475] = 0
a[476] = 0
a[477] = 0
a[478] = 0
a[479] = 0
a[480] = 0
a[481] = 0
a[482] = 0
a[483] = 0
a[484] = 0
a[485] = 0
a[486] = 0
a[487] = 0
a[488] = 0
a[489] = 0
a[490] = 0
a[491] = 0
a[492] = 0
a[493] = 0
a[494] = 0
a[495] = 0
a[496] = 0
a[497] = 0
a[498] = 0
a[499] = 0
a[500] = 0
a[501] = 0
a[502] = 0
a[503] = 0
a[504] = 0
a[505] = 0
a[506] = 0
a[507] = 0
a[508] = 0
a[509] = 0
a[510] = 0
a[511] = 0
a[512] = 0
a[513] = 0
a[514] = 0
a[515] = 0
a[516] = 0
a[517] = 0
a[518] = 0
a[519] = 0
a[520] = 0
a[521] = 0
a[522] = 0
a[523] = 0
a[524] = 0
a[525] = 0
a[526] = 0
a[527] = 0
a[528] = 0
a[529] = 0
a[530] = 0
a[531] = 0
a[532] = 0
a[533] = 0
a[534] = 0
a[535] = 0
a[536] = 0
a[537] = 0
a[538] = 0
a[539] = 0
a[540] = 0
a[541] = 0
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a[543] = 0
a[544] = 0
a[545] = 0
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a[547] = 0
a[548] = 0
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a[550] = 0
a[551] = 0
a[552] = 0
a[553] = 0
a[554] = 0
a[555] = 0
a[556] = 0
a[557] = 0
a[558] = 0
a[559] = 0
a[560] = 0
a[561] = 0
a[562] = 0
a[563] = 0
a[564] = 0
a[565] = 0
a[566] = 0
a[567] = 0
a[568] = 0
a[569] = 0
a[570] = 0
a[571] = 0
a[572] = 0
a[573] = 0
a[574] = 0
a[575] = 0
a[576] = 0
a[577] = 0
a[578] = 0
a[579] = 0
a[580] = 0
a[581] = 0
a[582] = 0
a[583] = 0
a[584] = 0
a[585] = 0
a[586] = 0
a[587] = 0
a[588] = 0
a[589] = 0
a[590] = 0
a[591] = 0
a[592] = 0
a[593] = 0
a[594] = 0
a[595] = 0
a[596] = 0
a[597] = 0
a[598] = 0
a[599] = 0
a[600] = 0
a[601] = 0
a[602] = 0
a[603] = 0
a[604] = 0
a[605] = 0
a[606] = 0
a[607] = 0
a[608] = 0
a[609] = 0
a[610] = 0
a[611] = 0
a[612] = 0
a[613] = 0
a[614] = 0
a[615] = 0
a[616] = 0
a[617] = 0
a[618] = 0
a[619] = 0
a[620] = 0
a[621] = 0
a[622] = 0
a[623] = 0
a[624] = 0
a[625] = 0
a[626] = 0
a[627] = 0
a[628] = 0
a[629] = 0
a[630] = 0
a[631] = 0
a[632] = 0
a[633] = 0
a[634] = 0
a[635] = 0
a[636] = 0
a[637] = 0
a[638] = 0
a[639] = 0
a[640] = 0
a[641] = 0
a[642] = 0
a[643] = 0
a[644] = 0
a[645] = 0
a[646] = 0
a[647] = 0
a[648] = 0
a[649] = 0
a[650] = 0
a[651] = 0
a[652] = 0
a[653] = 0
a[654] = 0
a[655] = 0
a[656] = 0
a[657] = 0
a[658] = 0
a[659] = 0
a[660] = 0
a[661] = 0
a[662] = 0
a[663] = 0
a[664] = 0
a[665] = 0
a[666] = 0
a[667] = 0
a[668] = 0
a[669] = 0
a[670] = 0
a[671] = 0
a[672] = 0
a[673] = 0
a[674] = 0
a[675] = 0
a[676] = 0
a[677] = 0
a[678] = 0
a[679] = 0
a[680] = 0
a[681] = 0
a[682] = 0
a[683] = 0
a[684] = 0
a[685] = 0
a[686] = 0
a[687] = 0
a[688] = 0
a[689] = 0
a[690] = 0
a[691] = 0
a[692] = 0
a[693] = 0
a[694] = 0
a[695] = 0
a[696] = 0
a[697] = 0
a[698] = 0
a[699] = 0
a[700] = 0
a[701] = 0
a[702] = 0
a[703] = 0
a[704] = 0
a[705] = 0
a[706] = 0
a[707] = 0
a[708] = 0
a[709] = 0
a[710] = 0
a[711] = 0
a[712] = 0
a[713] = 0
a[714] = 0
a[715] = 0
a[716] = 0
a[717] = 0
a[718] = 0
a[719] = 0
a[720] = 0
a[721] = 0
a[722] = 0
a[723] = 0
a[724] = 0
a[725] = 0
a[726] = 0
a[727] = 0
a[728] = 0
a[729] = 0
a[730] = 0
a[731] = 0
a[732] = 0
a[733] = 0
a[734] = 0
a[735] = 0
a[736] = 0
a[737] = 0
a[738] = 0
a[739] = 0
a[740] = 0
a[741] = 0
a[742] = 0
a[743] = 0
a[744] = 0
a[745] = 0
a[746] = 0
a[747] = 0
a[748] = 0
a[749] = 0
a[750] = 0
a[751] = 0
a[752] = 0
a[753] = 0
a[754] = 0
a[755] = 0
a[756] = 0
a[757] = 0
a[758] = 0
a[759] = 0
a[760] = 0
a[761] = 0
a[762] = 0
a[763] = 0
a[764] = 0
a[765] = 0
a[766] = 0
a[767] = 0
a[768] = 0
a[769] = 0
a[770] = 0
a[771] = 0
a[772] = 0
a[773] = 0
a[774] = 0
a[775] = 0
a[776] = 0
a[777] = 0
a[778] = 0
a[779] = 0
a[780] = 0
a[781] = 0
a[782] = 0
a[783] = 0
a[784] = 0
a[785] = 0
a[786] = 0
a[787] = 0
a[788] = 0
a[789] = 0
a[790] = 0
a[791] = 0
a[792] = 0
a[793] = 0
a[794] = 0
a[795] = 0
a[796] = 0
a[797] = 0
a[798] = 0
a[799] = 0
a[800] = 0
a[801] = 0
a[802] = 0
a[803] = 0
a[804] = 0
a[805] = 0
a[806] = 0
a[807] = 0
a[808] = 0
a[809] = 0
a[810] = 0
a[811] = 0
a[812] = 0
a[813] = 0
a[814] = 0
a[815] = 0
a[816] = 0
a[817] = 0
a[818] = 0
a[819] = 0
a[820] = 0
a[821] = 0
a[822] = 0
a[823] = 0
a[824] = 0
a[825] = 0
a[826] = 0
a[827] = 0
a[828] = 0
a[829] = 0
a[830] = 0
a[831] = 0
a[832] = 0
a[833] = 0
a[834] = 0
a[835] = 0
a[836] = 0
a[837] = 0
a[838] = 0
a[839] = 0
a[840] = 0
a[841] = 0
a[842] = 0
a[843] = 0
a[844] = 0
a[845] = 0
a[846] = 0
a[847] = 0
a[848] = 0
a[849] = 0
a[850] = 0
a[851] = 0
a[852] = 0
a[853] = 0
a[854] = 0
a[855] = 0
a[856] = 0
a[857] = 0
a[858] = 0
a[859] = 0
a[860] = 0
a[861] = 0
a[862] = 0
a[863] = 0
a[864] = 0
a[865] = 0
a[866] = 0
a[867] = 0
a[868] = 0
a[869] = 0
a[870] = 0
a[871] = 0
a[872] = 0
a[873] = 0
a[874] = 0
a[875] = 0
a[876] = 0
a[877] = 0
a[878] = 0
a[879] = 0
a[880] = 0
a[881] = 0
a[882] = 0
a[883] = 0
a[884] = 0
a[885] = 0
a[886] = 0
a[887] = 0
a[888] = 0
a[889] = 0
a[890] = 0
a[891] = 0
a[892] = 0
a[893] = 0
a[894] = 0
a[895] = 0
a[896] = 0
a[897] = 0
a[898] = 0
a[899] = 0
a[900] = 0
a[901] = 0
a[902] = 0
a[903] = 0
a[904] = 0
a[905] = 0
a[906] = 0
a[907] = 0
a[908] = 0
a[909] = 0
a[910] = 0
a[911] = 0
a[912] = 0
a[913] = 0
a[914] = 0
a[915] = 0
a[916] = 0
a[917] = 0
a[918] = 0
a[919] = 0
a[920] = 0
a[921] = 0
a[922] = 0
a[923] = 0
a[924] = 0
a[925] = 0
a[926] = 0
a[927] = 0
a[928] = 0
a[929] = 0
a[930] = 0
a[931] = 0
a[932] = 0
a[933] = 0
a[934] = 0
a[935] = 0
a[936] = 0
a[937] = 0
a[938] = 0
a[939] = 0
a[940] = 0
a[941] = 0
a[942] = 0
a[943] = 0
a[944] = 0
a[945] = 0
a[946] = 0
a[947] = 0
a[948] = 0
a[949] = 0
a[950] = 0
a[951] = 0
a[952] = 0
a[953] = 0
a[954] = 0
a[955] = 0
a[956] = 0
a[957] = 0
a[958] = 0
a[959] = 0
a[960] = 0
a[961] = 0
a[962] = 0
a[963] = 0
a[964] = 0
a[965] = 0
a[966] = 0
a[967] = 0
a[968] = 0
a[969] = 0
a[970] = 0
a[971] = 0
a[972] = 0
a[973] = 0
a[974] = 0
a[975] = 0
a[976] = 0
a[977] = 0
a[978] = 0
a[979] = 0
a[980] = 0
a[981] = 0
a[982] = 0
a[983] = 0
a[984] = 0
a[985] = 0
a[986] = 0
a[987] = 0
a[988] = 0
a[989] = 0
a[990] = 0
a[991] = 0
a[992] = 0
a[993] = 0
a[994] = 0
a[995] = 0
a[996] = 0
a[997] = 0
a[998] = 0
a[999] = 0
x := small(a) // ERROR "inlining call to small"
y := medium(a) // The crux of this test: medium is not inlined.
return x + y
}
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