diff options
| author | Akim Demaille <akim.demaille@gmail.com> | 2020-03-22 15:05:06 +0100 |
|---|---|---|
| committer | Akim Demaille <akim.demaille@gmail.com> | 2020-03-22 15:59:22 +0100 |
| commit | 5acc29041e942190cb7f03cebdafab443129ed22 (patch) | |
| tree | c321a2133b268aa9eeb4e0aa34170479a33b186a /etc | |
| parent | 5b0b0a1e08195fd31ff4a8c171a390d8f2aa7ec9 (diff) | |
| download | bison-5acc29041e942190cb7f03cebdafab443129ed22.tar.gz | |
bench: calc: work on a string instead of a file
The cost of the file layer is large and makes benchmarks too coarse,
as seen for in following example, first with a file, then with a
literal string:
0. %skeleton "yacc.c" %define parse.lac full
1. %skeleton "yacc-v1.c" %define nofinal %define parse.lac full
2. %skeleton "yacc-v2.c" %define nofinal %define parse.lac full
3. %skeleton "yacc-v3.c" %define nofinal %define parse.lac full
4. %skeleton "yacc.c"
5. %skeleton "yacc-v1.c" %define nofinal
6. %skeleton "yacc-v2.c" %define nofinal
7. %skeleton "yacc-v3.c" %define nofinal
--------------------------------------------------
Benchmark Time CPU Iterations
--------------------------------------------------
BM_y0 32558 ns 32537 ns 21228
BM_y1 32400 ns 32369 ns 21233
BM_y2 33485 ns 33464 ns 20625
BM_y3 32139 ns 32125 ns 21446
BM_y4 31343 ns 31329 ns 21747
BM_y5 31344 ns 31317 ns 22035
BM_y6 31287 ns 31255 ns 22039
BM_y7 31387 ns 31373 ns 22178
--------------------------------------------------
Benchmark Time CPU Iterations
--------------------------------------------------
BM_y0 10642 ns 10634 ns 63601
BM_y1 10657 ns 10654 ns 63625
BM_y2 10441 ns 10432 ns 65957
BM_y3 10558 ns 10554 ns 64546
BM_y4 9521 ns 9516 ns 72011
BM_y5 9179 ns 9157 ns 75028
BM_y6 9360 ns 9356 ns 73770
BM_y7 9365 ns 9359 ns 72609
Of course, at the same time it is less realistic: most users read
files rather that strings, so it might lead to us to pay attention to
costs most people don't see.
* etc/bench.pl.in (&calc_input): Output into a file given as argument.
Output in C syntax.
(&generate_grammar_calc): Use it.
Simplify the grammar: remove operators we don't care about.
Rewrite the scanner to work on a char* instead of a FILE*.
Diffstat (limited to 'etc')
| -rwxr-xr-x | etc/bench.pl.in | 158 |
1 files changed, 51 insertions, 107 deletions
diff --git a/etc/bench.pl.in b/etc/bench.pl.in index 023c2b01..dc932be4 100755 --- a/etc/bench.pl.in +++ b/etc/bench.pl.in @@ -334,26 +334,24 @@ EOF ################################################################## -=item C<calc_input ($base, $max)> +=item C<calc_input ($out, $max)> -Generate the input file F<$base.input> for the calc parser. The input -is composed of two expressions. The first one is using left recursion -only and consumes no stack. The second one requires a deep stack. -These two expressions are repeated C<$max> times in the output file. +Emit in C<$out> input for the calc parser. The input is composed of +two expressions. The first one is using left recursion only and +consumes no stack. The second one requires a deep stack. These two +expressions are repeated C<$max> times in the output file. =cut sub calc_input ($$) { - my ($base, $max) = @_; - my $out = new IO::File ">$base.input" - or die; + my ($out, $max) = @_; foreach (1 .. $max) { - print $out "0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+55+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70+71+72+73+74+75+76+77+78+79+80+81+82+83+84+85+86+87+88+89+90+91+92+93+94+95+96+97+98+99\n"; + print $out "0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+55+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70+71+72+73+74+75+76+77+78+79+80+81+82+83+84+85+86+87+88+89+90+91+92+93+94+95+96+97+98+99\\n\\\n"; if (!$gbench) { - print $out "1+1*(2+2*(3+3*(4+4*(5+5*(6+6*(7+7*(8+8*(9+9*(10+10*(11+11*(12+12*(13+13*(14+14*(15+15*(16+16*(17+17*(18+18*(19+19*(20+20*(21+21*(22+22*(23+23*(24+24*(25+25*(26+26*(27+27*(28+28*(29+29*(30+30*(31+31*(32+32*(33+33*(34+34*(35+35*(36+36*(37+37*(38+38*(39+39*(40+40*(41+41*(42+42*(43+43*(44+44*(45+45*(46+46*(47+47*(48+48*(49+49*(50+50*(51+51*(52+52*(53+53*(54+54*(55+55*(56+56*(57+57*(58+58*(59+59*(60+60*(61+61*(62+62*(63+63*(64+64*(65+65*(66+66*(67+67*(68+68*(69+69*(70+70*(71+71*(72+72*(73+73*(74+74*(75+75*(76+76*(77+77*(78+78*(79+79*(80+80*(81+81*(82+82*(83+83*(84+84*(85+85*(86+86*(87+87*(88+88*(89+89*(90+90*(91+91*(92+92*(93+93*(94+94*(95+95*(96+96*(97+97*(98+98*(99+99*(100+100*(101+101*(102+102*(103+103*(104+104*(105+105*(106+106*(107+107*(108+108*(109+109*(110+110*(111+111*(112+112*(113+113*(114+114*(115+115*(116+116*(117+117*(118+118*(119+119*(120+120*(121+121*(122+122*(123+123*(124+124*(125+125*(126+126*(127+127*(128+128*(129+129*(130+130*(131+131*(132+132*(133+133*(134+134*(135+135*(136+136*(137+137*(138+138*(139+139*(140+140*(141+141*(142+142*(143+143*(144+144*(145+145*(146+146*(147+147*(148+148*(149+149*(150+150*(151+151*(152+152*(153+153*(154+154*(155+155*(156+156*(157+157*(158+158*(159+159*(160+160*(161+161*(162+162*(163+163*(164+164*(165+165*(166+166*(167+167*(168+168*(169+169*(170+170*(171+171*(172+172*(173+173*(174+174*(175+175*(176+176*(177+177*(178+178*(179+179*(180+180*(181+181*(182+182*(183+183*(184+184*(185+185*(186+186*(187+187*(188+188*(189+189*(190+190*(191+191*(192+192*(193+193*(194+194*(195+195*(196+196*(197+197*(198+198*(199+199*(200+200*(201+201*(202+202*(203+203*(204+204*(205+205*(206+206*(207+207*(208+208*(209+209*(210+210*(211+211*(212+212*(213+213*(214+214*(215+215*(216+216*(217+217*(218+218*(219+219*(220+220*(221+221*(222+222*(223+223*(224+224*(225+225*(226+226*(227+227*(228+228*(229+229*(230+230*(231+231*(232+232*(233+233*(234+234*(235+235*(236+236*(237+237*(238+238*(239+239*(240+240*(241+241*(242+242*(243+243*(244+244*(245+245*(246+246*(247+247*(248+248*(249+249*(250+250*(251+251*(252+252*(253+253*(254+254*(255+255*(256+256*(257+257*(258+258*(259+259*(260+260*(261+261*(262+262*(263+263*(264+264*(265+265*(266+266*(267+267*(268+268*(269+269*(270+270*(271+271*(272+272*(273+273*(274+274*(275+275*(276+276*(277+277*(278+278*(279+279*(280+280*(281+281*(282+282*(283+283*(284+284*(285+285*(286+286*(287+287*(288+288*(289+289*(290+290*(291+291*(292+292*(293+293*(294+294*(295+295*(296+296*(297+297*(298+298*(299+299*(300+300*(301+301*(302+302*(303+303*(304+304*(305+305*(306+306*(307+307*(308+308*(309+309*(310+310*(311+311*(312+312*(313+313*(314+314*(315+315*(316+316*(317+317*(318+318*(319+319*(320+320*(321+321*(322+322*(323+323*(324+324*(325+325*(326+326*(327+327*(328+328*(329+329*(330+330*(331+331*(332+332*(333+333*(334+334*(335+335*(336+336*(337+337*(338+338*(339+339*(340+340*(341+341*(342+342*(343+343*(344+344*(345+345*(346+346*(347+347*(348+348*(349+349*(350+350*(351+351*(352+352*(353+353*(354+354*(355+355*(356+356*(357+357*(358+358*(359+359*(360+360*(361+361*(362+362*(363+363*(364+364*(365+365*(366+366*(367+367*(368+368*(369+369*(370+370*(371+371*(372+372*(373+373*(374+374*(375+375*(376+376*(377+377*(378+378*(379+379*(380+380*(381+381*(382+382*(383+383*(384+384*(385+385*(386+386*(387+387*(388+388*(389+389*(390+390*(391+391*(392+392*(393+393*(394+394*(395+395*(396+396*(397+397*(398+398*(399+399*(400+400*(401+401*(402+402*(403+403*(404+404*(405+405*(406+406*(407+407*(408+408*(409+409*(410+410*(411+411*(412+412*(413+413*(414+414*(415+415*(416+416*(417+417*(418+418*(419+419*(420+420*(421+421*(422+422*(423+423*(424+424*(425+425*(426+426*(427+427*(428+428*(429+429*(430+430*(431+431*(432+432*(433+433*(434+434*(435+435*(436+436*(437+437*(438+438*(439+439*(440+440*(441+441*(442+442*(443+443*(444+444*(445+445*(446+446*(447+447*(448+448*(449+449*(450+450*(451+451*(452+452*(453+453*(454+454*(455+455*(456+456*(457+457*(458+458*(459+459*(460+460*(461+461*(462+462*(463+463*(464+464*(465+465*(466+466*(467+467*(468+468*(469+469*(470+470*(471+471*(472+472*(473+473*(474+474*(475+475*(476+476*(477+477*(478+478*(479+479*(480+480*(481+481*(482+482*(483+483*(484+484*(485+485*(486+486*(487+487*(488+488*(489+489*(490+490*(491+491*(492+492*(493+493*(494+494*(495+495*(496+496*(497+497*(498+498*(499+499*(500+500*(501+501*(502+502*(503+503*(504+504*(505+505*(506+506*(507+507*(508+508*(509+509*(510+510*(511+511*(512+512*(513+513*(514+514*(515+515*(516+516*(517+517*(518+518*(519+519*(520+520*(521+521*(522+522*(523+523*(524+524*(525+525*(526+526*(527+527*(528+528*(529+529*(530+530*(531+531*(532+532*(533+533*(534+534*(535+535*(536+536*(537+537*(538+538*(539+539*(540+540*(541+541*(542+542*(543+543*(544+544*(545+545*(546+546*(547+547*(548+548*(549+549*(550+550*(551+551*(552+552*(553+553*(554+554*(555+555*(556+556*(557+557*(558+558*(559+559*(560+560*(561+561*(562+562*(563+563*(564+564*(565+565*(566+566*(567+567*(568+568*(569+569*(570+570*(571+571*(572+572*(573+573*(574+574*(575+575*(576+576*(577+577*(578+578*(579+579*(580+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+ print $out "1+1*(2+2*(3+3*(4+4*(5+5*(6+6*(7+7*(8+8*(9+9*(10+10*(11+11*(12+12*(13+13*(14+14*(15+15*(16+16*(17+17*(18+18*(19+19*(20+20*(21+21*(22+22*(23+23*(24+24*(25+25*(26+26*(27+27*(28+28*(29+29*(30+30*(31+31*(32+32*(33+33*(34+34*(35+35*(36+36*(37+37*(38+38*(39+39*(40+40*(41+41*(42+42*(43+43*(44+44*(45+45*(46+46*(47+47*(48+48*(49+49*(50+50*(51+51*(52+52*(53+53*(54+54*(55+55*(56+56*(57+57*(58+58*(59+59*(60+60*(61+61*(62+62*(63+63*(64+64*(65+65*(66+66*(67+67*(68+68*(69+69*(70+70*(71+71*(72+72*(73+73*(74+74*(75+75*(76+76*(77+77*(78+78*(79+79*(80+80*(81+81*(82+82*(83+83*(84+84*(85+85*(86+86*(87+87*(88+88*(89+89*(90+90*(91+91*(92+92*(93+93*(94+94*(95+95*(96+96*(97+97*(98+98*(99+99*(100+100*(101+101*(102+102*(103+103*(104+104*(105+105*(106+106*(107+107*(108+108*(109+109*(110+110*(111+111*(112+112*(113+113*(114+114*(115+115*(116+116*(117+117*(118+118*(119+119*(120+120*(121+121*(122+122*(123+123*(124+124*(125+125*(126+126*(127+127*(128+128*(129+129*(130+130*(131+131*(132+132*(133+133*(134+134*(135+135*(136+136*(137+137*(138+138*(139+139*(140+140*(141+141*(142+142*(143+143*(144+144*(145+145*(146+146*(147+147*(148+148*(149+149*(150+150*(151+151*(152+152*(153+153*(154+154*(155+155*(156+156*(157+157*(158+158*(159+159*(160+160*(161+161*(162+162*(163+163*(164+164*(165+165*(166+166*(167+167*(168+168*(169+169*(170+170*(171+171*(172+172*(173+173*(174+174*(175+175*(176+176*(177+177*(178+178*(179+179*(180+180*(181+181*(182+182*(183+183*(184+184*(185+185*(186+186*(187+187*(188+188*(189+189*(190+190*(191+191*(192+192*(193+193*(194+194*(195+195*(196+196*(197+197*(198+198*(199+199*(200+200*(201+201*(202+202*(203+203*(204+204*(205+205*(206+206*(207+207*(208+208*(209+209*(210+210*(211+211*(212+212*(213+213*(214+214*(215+215*(216+216*(217+217*(218+218*(219+219*(220+220*(221+221*(222+222*(223+223*(224+224*(225+225*(226+226*(227+227*(228+228*(229+229*(230+230*(231+231*(232+232*(233+233*(234+234*(235+235*(236+236*(237+237*(238+238*(239+239*(240+240*(241+241*(242+242*(243+243*(244+244*(245+245*(246+246*(247+247*(248+248*(249+249*(250+250*(251+251*(252+252*(253+253*(254+254*(255+255*(256+256*(257+257*(258+258*(259+259*(260+260*(261+261*(262+262*(263+263*(264+264*(265+265*(266+266*(267+267*(268+268*(269+269*(270+270*(271+271*(272+272*(273+273*(274+274*(275+275*(276+276*(277+277*(278+278*(279+279*(280+280*(281+281*(282+282*(283+283*(284+284*(285+285*(286+286*(287+287*(288+288*(289+289*(290+290*(291+291*(292+292*(293+293*(294+294*(295+295*(296+296*(297+297*(298+298*(299+299*(300+300*(301+301*(302+302*(303+303*(304+304*(305+305*(306+306*(307+307*(308+308*(309+309*(310+310*(311+311*(312+312*(313+313*(314+314*(315+315*(316+316*(317+317*(318+318*(319+319*(320+320*(321+321*(322+322*(323+323*(324+324*(325+325*(326+326*(327+327*(328+328*(329+329*(330+330*(331+331*(332+332*(333+333*(334+334*(335+335*(336+336*(337+337*(338+338*(339+339*(340+340*(341+341*(342+342*(343+343*(344+344*(345+345*(346+346*(347+347*(348+348*(349+349*(350+350*(351+351*(352+352*(353+353*(354+354*(355+355*(356+356*(357+357*(358+358*(359+359*(360+360*(361+361*(362+362*(363+363*(364+364*(365+365*(366+366*(367+367*(368+368*(369+369*(370+370*(371+371*(372+372*(373+373*(374+374*(375+375*(376+376*(377+377*(378+378*(379+379*(380+380*(381+381*(382+382*(383+383*(384+384*(385+385*(386+386*(387+387*(388+388*(389+389*(390+390*(391+391*(392+392*(393+393*(394+394*(395+395*(396+396*(397+397*(398+398*(399+399*(400+400*(401+401*(402+402*(403+403*(404+404*(405+405*(406+406*(407+407*(408+408*(409+409*(410+410*(411+411*(412+412*(413+413*(414+414*(415+415*(416+416*(417+417*(418+418*(419+419*(420+420*(421+421*(422+422*(423+423*(424+424*(425+425*(426+426*(427+427*(428+428*(429+429*(430+430*(431+431*(432+432*(433+433*(434+434*(435+435*(436+436*(437+437*(438+438*(439+439*(440+440*(441+441*(442+442*(443+443*(444+444*(445+445*(446+446*(447+447*(448+448*(449+449*(450+450*(451+451*(452+452*(453+453*(454+454*(455+455*(456+456*(457+457*(458+458*(459+459*(460+460*(461+461*(462+462*(463+463*(464+464*(465+465*(466+466*(467+467*(468+468*(469+469*(470+470*(471+471*(472+472*(473+473*(474+474*(475+475*(476+476*(477+477*(478+478*(479+479*(480+480*(481+481*(482+482*(483+483*(484+484*(485+485*(486+486*(487+487*(488+488*(489+489*(490+490*(491+491*(492+492*(493+493*(494+494*(495+495*(496+496*(497+497*(498+498*(499+499*(500+500*(501+501*(502+502*(503+503*(504+504*(505+505*(506+506*(507+507*(508+508*(509+509*(510+510*(511+511*(512+512*(513+513*(514+514*(515+515*(516+516*(517+517*(518+518*(519+519*(520+520*(521+521*(522+522*(523+523*(524+524*(525+525*(526+526*(527+527*(528+528*(529+529*(530+530*(531+531*(532+532*(533+533*(534+534*(535+535*(536+536*(537+537*(538+538*(539+539*(540+540*(541+541*(542+542*(543+543*(544+544*(545+545*(546+546*(547+547*(548+548*(549+549*(550+550*(551+551*(552+552*(553+553*(554+554*(555+555*(556+556*(557+557*(558+558*(559+559*(560+560*(561+561*(562+562*(563+563*(564+564*(565+565*(566+566*(567+567*(568+568*(569+569*(570+570*(571+571*(572+572*(573+573*(574+574*(575+575*(576+576*(577+577*(578+578*(579+579*(580+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} } } @@ -377,10 +375,6 @@ sub generate_grammar_calc ($$@) if ($gbench); my $directives = directives ($base, @directive); - # Putting this request here is stupid, since the input will be - # generated each time we generate a grammar. - calc_input ('calc', $gbench ? 1 : 200); - my $out = new IO::File ">$base.y" or die; print $out <<EOF; @@ -458,20 +452,18 @@ exp: fprintf (stderr, "calc: error: %d != %d\\n", \$1, \$3); \$\$ = \$1; } -| exp "+" exp { \$\$ = \$1 + \$3; } -| exp "-" exp { \$\$ = \$1 - \$3; } -| exp "*" exp { \$\$ = \$1 * \$3; } -| exp "/" exp { \$\$ = \$1 / \$3; } -| "-" exp %prec NEG { \$\$ = -\$2; } -| exp "^" exp { \$\$ = power (\$1, \$3); } -| "(" exp ")" { \$\$ = \$2; } +| exp "+" exp { \$\$ = \$1 + \$3; } +| exp "-" exp { \$\$ = \$1 - \$3; } +| exp "*" exp { \$\$ = \$1 * \$3; } +| exp "/" exp { \$\$ = \$1 / \$3; } +| "-" exp %prec NEG { \$\$ = -\$2; } +| "(" exp ")" { \$\$ = \$2; } | "(" error ")" { \$\$ = 1111; } -| "!" { \$\$ = 0; YYERROR; } | "-" error { \$\$ = 0; YYERROR; } ; %% /* The input. */ -static FILE *input; +static const char *input; static void yyerror (const char *s) @@ -480,42 +472,6 @@ yyerror (const char *s) } static int -get_char (void) -{ - return getc (input); -} - -static void -unget_char ( int c) -{ - ungetc (c, input); -} - -static int -read_signed_integer (void) -{ - int c = get_char (); - int sign = 1; - int n = 0; - - if (c == '-') - { - c = get_char (); - sign = -1; - } - - while (isdigit (c)) - { - n = 10 * n + (c - '0'); - c = get_char (); - } - - unget_char (c); - - return sign * n; -} - -static int #if YYPURE # define yylval (*yylvalp) yylex (YYSTYPE* yylvalp) @@ -525,70 +481,65 @@ yylex (void) { int c; - while ((c = get_char ()) == ' ' || c == '\t') - continue; + // Ignore white space, get first nonwhite character. + do { + c = *input++; + } while (c == ' ' || c == '\t'); switch (c) - { - case '0': case '1': case '2': case '3': case '4': - case '5': case '6': case '7': case '8': case '9': - case '.': - unget_char (c); - yylval.NUM = read_signed_integer (); - return NUM; - + { case '+': return PLUS; case '-': return MINUS; case '*': return STAR; case '/': return SLASH; - case '^': return CARET; case '=': return EQUAL; - case '!': return BANG; case '(': return LPAREN; case ')': return RPAREN; case '\\n': return EOL; - case EOF: return CALC_EOF; + case 0: return CALC_EOF; - default: return c; - } + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + { + int nchars = 0; + sscanf (input - 1, "%d%n", &yylval.NUM, &nchars); + input += nchars - 1; + return NUM; + } + + default: + yyerror ("error: invalid character"); + return yylex (); + } } +EOF -static int -power (int base, int exponent) -{ - assert (0 <= exponent); - int res = 1; - for (/* Niente */; exponent; --exponent) - res *= base; - return res; -} + print $out "static const char *INPUT = \"\\n\\\n"; + calc_input ($out, $gbench ? 1 : 200); + print $out "\";\n"; -@{[ - $gbench ? <<BENCH : <<MAIN + if ($gbench) + { + print $out <<EOF; static void BM_${prefix} (benchmark::State& state) { #if YYDEBUG yydebug = !!getenv ("YYDEBUG"); #endif - input = fopen ("calc.input", "r"); - if (!input) - { - perror ("calc.input"); - exit (3); - } - for (auto _ : state) { - rewind (input); - ${prefix}parse (); + input = INPUT; + yyparse (); } - - fclose (input); } BENCHMARK(BM_${prefix}); -BENCH +EOF + } + else + { + print $out <<EOF; int main (int argc, const char **argv) { @@ -596,18 +547,11 @@ main (int argc, const char **argv) yydebug = !!getenv ("YYDEBUG"); #endif - input = fopen ("calc.input", "r"); - if (!input) - { - perror ("calc.input"); - return 3; - } - - return yyparse (); + input = INPUT; + yyparse (); } -MAIN -]} EOF + } } ################################################################## |