[libc-commits] [libc] 5bd34e0 - [libc] Fix Off By One Errors In Printf Long Double (#66957)
via libc-commits
libc-commits at lists.llvm.org
Thu Sep 21 11:43:34 PDT 2023
Author: michaelrj-google
Date: 2023-09-21T11:43:29-07:00
New Revision: 5bd34e0a551e379d99004e5f34b932eb32569caa
URL: https://github.com/llvm/llvm-project/commit/5bd34e0a551e379d99004e5f34b932eb32569caa
DIFF: https://github.com/llvm/llvm-project/commit/5bd34e0a551e379d99004e5f34b932eb32569caa.diff
LOG: [libc] Fix Off By One Errors In Printf Long Double (#66957)
Two major off-by-one errors are fixed in this patch. The first is in
float_to_string.h with length_for_num, which wasn't accounting for the
implicit leading bit when calculating the length of a number, causing
a missing digit on 80 bit float max. The other off-by-one is the
ryu_long_double_constants.h (a.k.a the Mega Table) not having any
entries for the last POW10_OFFSET in POW10_SPLIT. This was also found on
80 bit float max. Finally, the integer calculation mode was using a
slightly too short integer, again on 80 bit float max, not accounting
for the mantissa width. All of these are fixed in this patch.
Added:
Modified:
libc/src/__support/float_to_string.h
libc/src/__support/ryu_long_double_constants.h
libc/test/src/stdio/sprintf_test.cpp
libc/utils/mathtools/ryu_tablegen.py
Removed:
################################################################################
diff --git a/libc/src/__support/float_to_string.h b/libc/src/__support/float_to_string.h
index 1e78bcb200b8c80..d430594060424bd 100644
--- a/libc/src/__support/float_to_string.h
+++ b/libc/src/__support/float_to_string.h
@@ -157,7 +157,7 @@ LIBC_INLINE constexpr uint32_t ceil_log10_pow2(const uint32_t e) {
LIBC_INLINE constexpr uint32_t length_for_num(const uint32_t idx,
const uint32_t mantissa_width) {
//+8 to round up when dividing by 9
- return (ceil_log10_pow2(idx) + ceil_log10_pow2(mantissa_width) +
+ return (ceil_log10_pow2(idx) + ceil_log10_pow2(mantissa_width + 1) +
(BLOCK_SIZE - 1)) /
BLOCK_SIZE;
// return (ceil_log10_pow2(16 * idx + mantissa_width) + 8) / 9;
@@ -666,7 +666,7 @@ FloatToString<long double>::get_positive_block(int block_index) {
// ----------------------------- INT CALC MODE -----------------------------
const int32_t SHIFT_CONST = CALC_SHIFT_CONST;
const uint64_t MAX_POW_2_SIZE =
- exponent + CALC_SHIFT_CONST - (BLOCK_SIZE * block_index);
+ pos_exp + CALC_SHIFT_CONST - (BLOCK_SIZE * block_index);
const uint64_t MAX_POW_5_SIZE =
internal::log2_pow5(BLOCK_SIZE * block_index);
const uint64_t MAX_INT_SIZE =
@@ -680,8 +680,10 @@ FloatToString<long double>::get_positive_block(int block_index) {
val = internal::get_table_positive<4096>(pos_exp, block_index);
} else if (MAX_INT_SIZE < 8192) {
val = internal::get_table_positive<8192>(pos_exp, block_index);
- } else {
+ } else if (MAX_INT_SIZE < 16384) {
val = internal::get_table_positive<16384>(pos_exp, block_index);
+ } else {
+ val = internal::get_table_positive<16384 + 128>(pos_exp, block_index);
}
#endif
const uint32_t shift_amount = SHIFT_CONST + pos_exp - exponent;
diff --git a/libc/src/__support/ryu_long_double_constants.h b/libc/src/__support/ryu_long_double_constants.h
index 7c5297d9134bbed..8ebb29727789bdc 100644
--- a/libc/src/__support/ryu_long_double_constants.h
+++ b/libc/src/__support/ryu_long_double_constants.h
@@ -35403,6 +35403,558 @@ constexpr uint64_t POW10_SPLIT[][5] = {
{8185529170695989288u, 251935u, 0u, 0u, 0u},
{4647388653739187u, 0u, 0u, 0u, 0u},
{4647389u, 0u, 0u, 0u, 0u},
+ {1u, 0u, 0u, 0u, 1666406u},
+ {9167511163728910775u, 3312060066959522888u, 1295184565790726114u, 14514316166628409175u, 467615u},
+ {18446650963712978694u, 11459123952047835623u, 11203169122561999106u, 12474589757305876786u, 2263011u},
+ {1727375103581005166u, 6279996614298463960u, 7709863957368393064u, 16687049419988932499u, 1149488u},
+ {5260295235157421525u, 18426378431810315116u, 1049713953025921878u, 12343052908124526721u, 3504815u},
+ {3705581585852188490u, 3335423218796647794u, 5009356519446298754u, 17358475006776455890u, 3071434u},
+ {14296650234967904607u, 13533728612605645886u, 13550853390885990417u, 17206365355322613797u, 2749915u},
+ {18409334644427041092u, 1794178469698007910u, 17611594257294438978u, 1708051658308162884u, 3019512u},
+ {4754135742177139480u, 6231107125027989758u, 17105560207999383557u, 17277465141864323237u, 2595660u},
+ {18358242171314739190u, 5662514190210093154u, 11287743438560124974u, 5452201045844425276u, 2058811u},
+ {17761256625928321051u, 17212837789613283598u, 9527998849657635872u, 11639251005171736777u, 1601676u},
+ {5821492835406745926u, 2889087753330502654u, 17816699099621606956u, 1830985569848452224u, 878190u},
+ {12963632653576508465u, 16198926776608324708u, 18116681369755801167u, 3835252232019257168u, 913381u},
+ {9574571567457348478u, 3277569375660351599u, 18148476178141229221u, 8447587411821609647u, 210151u},
+ {13880179963005905487u, 5477919832920232767u, 14817599233219952607u, 8578730300674845931u, 1381841u},
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+ {12660825544341635357u, 17072319751234321385u, 4141906532134766863u, 8022987279786678839u, 1041705u},
+ {4208242032265338789u, 6179533235162763885u, 4663781822995994981u, 15151310821523157448u, 1739068u},
+ {10653887473848443412u, 11200751534061535549u, 606738062098171451u, 13578907836604540712u, 3000918u},
+ {13120902791532787541u, 15157295797028660471u, 15143378621921492754u, 6972886207552178012u, 3720865u},
+ {2917010345935268847u, 14296034567889414688u, 6010795054467218268u, 5472957404205304698u, 2111479u},
+ {3742646036080397844u, 1151328827019557461u, 9996378462949280080u, 12216683310612790758u, 1689927u},
+ {9619773773509228999u, 15481406353179655672u, 858931880484260835u, 1400267949809565856u, 215249u},
+ {948392722800532033u, 11348006699322003232u, 1574581608721209477u, 17441908401793950369u, 954248u},
+ {462598889539630657u, 5800041313224363972u, 81444903863947377u, 594063538384181082u, 2527082u},
+ {51652138247582647u, 14320710675845841103u, 9242659841859226976u, 2280401850677107635u, 2752120u},
+ {17724376936085623124u, 10914972719891653171u, 16058509705904217847u, 4446280891894143477u, 3375059u},
+ {15603682070138069368u, 17227461949292265365u, 8516655538738209687u, 15842871948359168961u, 1876052u},
+ {2164787505947305985u, 1314374343496442562u, 1613518136772747793u, 3277198798662600020u, 3493366u},
+ {1241523173912533272u, 9344770226938929374u, 2825662592730452629u, 3090860181427970552u, 1325337u},
+ {6500955467731547228u, 10494820024245753425u, 8080875601806383935u, 13427160646595874273u, 2037366u},
+ {12849740150501879112u, 878507731814419636u, 17221100512977373214u, 11927085798871747420u, 864123u},
+ {7616793236080815838u, 14207627352045752879u, 13702613918041915501u, 13850998323038455629u, 135940u},
+ {17419639683032134222u, 7535321661157406685u, 8949155094029408843u, 14558141659901821471u, 3317420u},
+ {5407977910102188888u, 3123393472277042012u, 11506565976623227603u, 14184484043717022656u, 3851934u},
+ {1287332972838146586u, 13340604206896449100u, 13123899189259079054u, 14770804838608603315u, 2005098u},
+ {15038169683813021494u, 3215060569813160179u, 2485545355485800227u, 253160326533295521u, 3699297u},
+ {968448526437954958u, 10172615572427506342u, 12870468088719309768u, 1077046301795792953u, 2661703u},
+ {16491073505286710206u, 4776625450912764881u, 8499429596999256617u, 4228440209318091524u, 3844291u},
+ {13144847925556245583u, 5086820599644725425u, 3864883981563063797u, 15419182186528955543u, 1566144u},
+ {13456254344894082659u, 12053415236713946928u, 9869824296384523522u, 14296293892479489286u, 824636u},
+ {4612142625692954708u, 17390478244333552846u, 5273943730985591382u, 11760599691724515010u, 2066342u},
+ {5899769588486058447u, 13719977949088340476u, 550149834463641958u, 830750828220564130u, 3488855u},
+ {10534787308359918187u, 13209693485526300107u, 17041172457937954450u, 11377400280080718717u, 3195784u},
+ {2435776775255582925u, 16721099619973654109u, 14430992332922355956u, 11371994084894942037u, 806232u},
+ {14042081236324420284u, 2963128925266938408u, 2092099659278665951u, 14066103204135976604u, 937954u},
+ {10566210754735983697u, 7250659501254350448u, 16830998706112843403u, 11474459663487557196u, 2746711u},
+ {10726083074336755492u, 5231374047940318539u, 13213258395716541530u, 3725605182270227235u, 62066u},
+ {3883746425241127871u, 14946131023260350215u, 5549258235235903935u, 11674475153487609671u, 3862930u},
+ {14393910121425636773u, 6473116559170572233u, 13126787039533254617u, 4394714135034806151u, 2338757u},
+ {11380892778805865294u, 2623953889057718829u, 15561442046877712686u, 16184043520720168528u, 3629338u},
+ {4019896420561230106u, 13682873562996146370u, 6697620537159396878u, 11019703779192078669u, 2738454u},
+ {5968187012136698778u, 16270120631095531078u, 12047943638884579433u, 11291500241032088011u, 3654240u},
+ {5839830805684327272u, 17982414620093159251u, 17143294400944311354u, 1076215157886403736u, 3579894u},
+ {8793931010555164936u, 15377471400260893822u, 8470974373286997449u, 1507189270263782259u, 1508104u},
+ {5102179307437569337u, 3730252954023074536u, 16492834014703398671u, 2189547431169565019u, 2120840u},
+ {3438236539395638478u, 9892295529584675112u, 11415628479610930188u, 11568337640959303356u, 1384007u},
+ {12753332279374869354u, 2352654878819984441u, 6690793983327713765u, 6006310739641578864u, 3453079u},
+ {6822555037746972750u, 16908857709188787844u, 7862085857762970638u, 13682583343753991548u, 2931330u},
+ {17163670097373676040u, 7084078904513823961u, 12774754487691517574u, 6755429753515468411u, 929172u},
+ {10899112525774686375u, 5322147284073737894u, 177279919491202035u, 593600957143310093u, 154996u},
+ {6536239966731470442u, 5004537090468546580u, 14860395034310464002u, 8217424892461834346u, 2057531u},
+ {9635866402238077889u, 13361756555251337323u, 16746958562614786886u, 5009928744615176163u, 1091279u},
+ {14418019652747213660u, 4161742605756651257u, 7252024352738705708u, 12197863941845763614u, 2390186u},
+ {3690751242878133745u, 1357251444293563710u, 3405346255116476424u, 18058489671110411480u, 2452663u},
+ {8884354494438447791u, 18257396216143614355u, 1947328475511158815u, 2351086673932240313u, 1572516u},
+ {11663903200490507524u, 16723779807808058321u, 3711967642423355165u, 17827233529923100315u, 1455863u},
+ {6350713148693756534u, 5472793569975335610u, 16001165561450181777u, 13285453252973356762u, 1361019u},
+ {7196143823434156761u, 4785875547581960460u, 3767073559708352574u, 17246871357522686057u, 1448695u},
+ {12915667836839069498u, 3848370932170070873u, 7397645704488294962u, 6800137562717960000u, 2293158u},
+ {279561028095290524u, 17665948925617459094u, 12591808902876062942u, 18200815003104557082u, 534033u},
+ {1014466257507712139u, 11840771384660824305u, 1525627097628953880u, 16222809846812515936u, 493424u},
+ {5778499859244332170u, 239287486616116946u, 11235711116246593027u, 5485479229353159044u, 1475334u},
+ {15827562941444384151u, 1882203109389839939u, 18022446613796125709u, 10403508655668344220u, 1287938u},
+ {10617363928325999389u, 16004449707254836050u, 2906321956832367953u, 4058983539196278404u, 3039506u},
+ {1572837626401424878u, 16717353587109129911u, 10891328483580322792u, 14035242236709507747u, 2090925u},
+ {4013646543180537715u, 10465368162944436926u, 17011449912082695626u, 17476508529566123892u, 2341155u},
+ {7334613124894770187u, 11045481991511767987u, 16227238705961063697u, 14598820700259837086u, 1049074u},
+ {9920066073374336886u, 16492983325224438894u, 7597119454862309828u, 16448483454838772882u, 2927851u},
+ {13394616778403033259u, 7785415074875790612u, 4560590352721251124u, 2215737155669276119u, 698675u},
+ {10928571732483674251u, 11933756357247984107u, 11890493039126391710u, 8659799565682788496u, 148914u},
+ {7989148123538360129u, 5352507825763642065u, 15719088971959752715u, 146862175182647821u, 1796094u},
+ {10391882985101183219u, 9150218065935334770u, 10751421471809048927u, 7743294648555476610u, 3282887u},
+ {14589635302984404535u, 8981796418648001305u, 6114579199245562112u, 3086977533648176089u, 3371711u},
+ {11660831417479146071u, 12259579797065747659u, 11748935419883368219u, 13753139960200796679u, 485274u},
+ {13390264473793791645u, 24910993518807165u, 2798361181829106818u, 6133847232260639849u, 470990u},
+ {3470242773902998213u, 14659890233930989434u, 18008812635260641118u, 14420207045710710893u, 311547u},
+ {12907859068092350164u, 16086974568506940195u, 7157721240988335137u, 14056977879592086555u, 2947763u},
+ {8251179107570303596u, 3811668176210728874u, 10926404289158350062u, 4449889880021532264u, 642976u},
+ {8093766228884096833u, 7467643073958945263u, 12569269789051847659u, 5848525935239590168u, 3129901u},
+ {17311902433977298412u, 13619323446148005800u, 10183712940102274416u, 8632590179084997918u, 1758807u},
+ {3008400851376462910u, 15902991501335165357u, 8007363231101877316u, 6733800516763937102u, 591631u},
+ {15785282909023622483u, 1111580227218342821u, 9150743487201641645u, 8657824956928225692u, 1281970u},
+ {2328049455322581378u, 243648968715481454u, 15004382635231025593u, 10039653752429981494u, 2083587u},
+ {13765383930480561096u, 10178776302361367814u, 17578051603214794385u, 16467566846831531423u, 3688325u},
+ {5452213069609480124u, 12500900122681739971u, 14676499349359960723u, 10876676709492422028u, 1031683u},
+ {15630942213536175708u, 14405402230239782635u, 15352704097385341306u, 7008617824821883392u, 2833202u},
+ {15866872391068835275u, 10626521610085046973u, 16222764483420727778u, 5024237347828767457u, 408003u},
+ {987459778602510876u, 7415049863893150574u, 308988605714341954u, 17445464089125103578u, 1684477u},
+ {13210694762062102892u, 3327654545986117185u, 9270750839110120763u, 18189586831120354005u, 2983214u},
+ {1824921960622170989u, 377096222442144674u, 8023002361367862100u, 14322434222874425525u, 1152031u},
+ {11293178811761037468u, 2123730037480286650u, 6127226634742215671u, 453596799571981527u, 2458865u},
+ {8718988959940011264u, 14922876261363392774u, 3804776868493412673u, 8259923774144183340u, 13657u},
+ {13657712062600689024u, 15763567487601503302u, 9050028945829595852u, 251935443738425u, 0u},
+ {10466626043363181657u, 6818666522446702205u, 8185529170695989287u, 251935u, 0u},
+ {2018209524826601272u, 10742761122394389465u, 4647388653739186u, 0u, 0u},
+ {4855442052952102466u, 12059359465839967396u, 4647388u, 0u, 0u},
+ {9325685136827616813u, 85729189106588351u, 0u, 0u, 0u},
+ {1966208041461408697u, 85729189u, 0u, 0u, 0u},
+ {1581424411095884124u, 0u, 0u, 0u, 0u},
+ {1581424412u, 0u, 0u, 0u, 0u}
};
constexpr uint64_t POW10_SPLIT_2[][5] = {
diff --git a/libc/test/src/stdio/sprintf_test.cpp b/libc/test/src/stdio/sprintf_test.cpp
index 68fbe6e460207f7..4fda76d4a4e5a72 100644
--- a/libc/test/src/stdio/sprintf_test.cpp
+++ b/libc/test/src/stdio/sprintf_test.cpp
@@ -1101,6 +1101,79 @@ TEST_F(LlvmLibcSPrintfTest, FloatDecimalConv) {
"231934194956788626761834746430104077432547436359522462253411168467463134"
"24896.000000");
+ written = __llvm_libc::sprintf(big_buff, "%Lf", 0xf.fffffffffffffffp+16380L);
+ ASSERT_STREQ_LEN(
+ written, big_buff,
+ "118973149535723176502126385303097020516906332229462420044032373389173700"
+ "552297072261641029033652888285354569780749557731442744315367028843419812"
+ "557385374367867359320070697326320191591828296152436552951064679108661431"
+ "179063216977883889613478656060039914875343321145491116008867984515486651"
+ "285234014977303760000912547939396622315138362241783854274391783813871780"
+ "588948754057516822634765923557697480511372564902088485522249479139937758"
+ "502601177354918009979622602685950855888360815984690023564513234659447638"
+ "493985927645628457966177293040780660922910271504608538808795932778162298"
+ "682754783076808004015069494230341172895777710033571401055977524212405734"
+ "700738625166011082837911962300846927720096515350020847447079244384854591"
+ "288672300061908512647211195136146752763351956292759795725027800298079590"
+ "419313960302147099703527646744553092202267965628099149823208332964124103"
+ "850923918473478612192169721054348428704835340811304257300221642134891734"
+ "717423480071488075100206439051723424765600472176809648610799494341570347"
+ "632064355862420744350442438056613601760883747816538902780957697597728686"
+ "007148702828795556714140463261583262360276289631617397848425448686060994"
+ "827086796804807870251185893083854658422304090880599629459458620190376604"
+ "844679092600222541053077590106576067134720012584640695703025713896098375"
+ "799892695455305236856075868317922311363951946885088077187210470520395758"
+ "748001314313144425494391994017575316933939236688185618912993172910425292"
+ "123683515992232205099800167710278403536014082929639811512287776813570604"
+ "578934353545169653956125404884644716978689321167108722908808277835051822"
+ "885764606221873970285165508372099234948333443522898475123275372663606621"
+ "390228126470623407535207172405866507951821730346378263135339370677490195"
+ "019784169044182473806316282858685774143258116536404021840272491339332094"
+ "921949842244273042701987304453662035026238695780468200360144729199712309"
+ "553005720614186697485284685618651483271597448120312194675168637934309618"
+ "961510733006555242148519520176285859509105183947250286387163249416761380"
+ "499631979144187025430270675849519200883791516940158174004671147787720145"
+ "964446117520405945350476472180797576111172084627363927960033967047003761"
+ "337450955318415007379641260504792325166135484129188421134082301547330475"
+ "406707281876350361733290800595189632520707167390454777712968226520622565"
+ "143991937680440029238090311243791261477625596469422198137514696707944687"
+ "035800439250765945161837981185939204954403611491531078225107269148697980"
+ "924094677214272701240437718740921675661363493890045123235166814608932240"
+ "069799317601780533819184998193300841098599393876029260139091141452600372"
+ "028487213241195542428210183120421610446740462163533690058366460659115629"
+ "876474552506814500393294140413149540067760295100596225302282300363147382"
+ "468105964844244132486457313743759509641616804802412935187620466813563687"
+ "753281467553879887177183651289394719533506188500326760735438867336800207"
+ "438784965701457609034985757124304510203873049485425670247933932280911052"
+ "604153852899484920399109194612991249163328991799809438033787952209313146"
+ "694614970593966415237594928589096048991612194498998638483702248667224914"
+ "892467841020618336462741696957630763248023558797524525373703543388296086"
+ "275342774001633343405508353704850737454481975472222897528108302089868263"
+ "302028525992308416805453968791141829762998896457648276528750456285492426"
+ "516521775079951625966922911497778896235667095662713848201819134832168799"
+ "586365263762097828507009933729439678463987902491451422274252700636394232"
+ "799848397673998715441855420156224415492665301451550468548925862027608576"
+ "183712976335876121538256512963353814166394951655600026415918655485005705"
+ "261143195291991880795452239464962763563017858089669222640623538289853586"
+ "759599064700838568712381032959192649484625076899225841930548076362021508"
+ "902214922052806984201835084058693849381549890944546197789302911357651677"
+ "540623227829831403347327660395223160342282471752818181884430488092132193"
+ "355086987339586127607367086665237555567580317149010847732009642431878007"
+ "000879734603290627894355374356444885190719161645514115576193939969076741"
+ "515640282654366402676009508752394550734155613586793306603174472092444651"
+ "353236664764973540085196704077110364053815007348689179836404957060618953"
+ "500508984091382686953509006678332447257871219660441528492484004185093281"
+ "190896363417573989716659600075948780061916409485433875852065711654107226"
+ "099628815012314437794400874930194474433078438899570184271000480830501217"
+ "712356062289507626904285680004771889315808935851559386317665294808903126"
+ "774702966254511086154895839508779675546413794489596052797520987481383976"
+ "257859210575628440175934932416214833956535018919681138909184379573470326"
+ "940634289008780584694035245347939808067427323629788710086717580253156130"
+ "235606487870925986528841635097252953709111431720488774740553905400942537"
+ "542411931794417513706468964386151771884986701034153254238591108962471088"
+ "538580868883777725864856414593426212108664758848926003176234596076950884"
+ "9149662444156604419552086811989770240.000000");
+
written = __llvm_libc::sprintf(big_buff, "%.10Lf", 1e-10L);
ASSERT_STREQ_LEN(written, big_buff, "0.0000000001");
@@ -1749,6 +1822,9 @@ TEST_F(LlvmLibcSPrintfTest, FloatExponentConv) {
written = __llvm_libc::sprintf(buff, "%.9Le", 1000000000500000000.0L);
ASSERT_STREQ_LEN(written, buff, "1.000000000e+18");
+
+ written = __llvm_libc::sprintf(buff, "%Le", 0xf.fffffffffffffffp+16380L);
+ ASSERT_STREQ_LEN(written, buff, "1.189731e+4932");
#endif
// TODO: Fix long doubles (needs bigger table or alternate algorithm.)
@@ -2378,6 +2454,9 @@ TEST_F(LlvmLibcSPrintfTest, FloatAutoConv) {
// Length Modifier Tests.
+ written = __llvm_libc::sprintf(buff, "%Lg", 0xf.fffffffffffffffp+16380L);
+ ASSERT_STREQ_LEN(written, buff, "1.18973e+4932");
+
// TODO: Uncomment the below tests after long double support is added
/*
written = __llvm_libc::sprintf(buff, "%Lf", 1e100L);
diff --git a/libc/utils/mathtools/ryu_tablegen.py b/libc/utils/mathtools/ryu_tablegen.py
index e4b5734d95cea7b..91e2029e4177108 100644
--- a/libc/utils/mathtools/ryu_tablegen.py
+++ b/libc/utils/mathtools/ryu_tablegen.py
@@ -173,10 +173,10 @@ def print_negative_table_for_idx(idx):
)
else:
print("static const uint64_t POW10_SPLIT[][" + str(MID_INT_SIZE // 64) + "] = {")
- for idx in range(0, POSITIVE_ARR_SIZE):
+ for idx in range(0, POSITIVE_ARR_SIZE + 1):
num_size = print_positive_table_for_idx(idx)
+ positive_size_arr[idx] = acc
acc += num_size
- positive_size_arr[idx + 1] = acc
print("};")
print(
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