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Performance optimization in the yy_find_shift_action() routine of the

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Lemon-generated parser.

FossilOrigin-Name: ba6663beefcc8060e6f3be6ab37c13fdbb08b7de
This commit is contained in:
drh 2016-08-10 01:43:30 +00:00
parent 8d57d7af23
commit c83db9e4e1
3 changed files with 32 additions and 35 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Fix\sharmless\scompiler\swarning.
D 2016-08-09T21:01:52.333
C Performance\soptimization\sin\sthe\syy_find_shift_action()\sroutine\sof\sthe\nLemon-generated\sparser.
D 2016-08-10T01:43:30.837
F Makefile.in cfd8fb987cd7a6af046daa87daa146d5aad0e088
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc d66d0395c38571aab3804f8db0fa20707ae4609a
@ -1438,7 +1438,7 @@ F tool/genfkey.README cf68fddd4643bbe3ff8e31b8b6d8b0a1b85e20f4
F tool/genfkey.test 4196a8928b78f51d54ef58e99e99401ab2f0a7e5
F tool/getlock.c f4c39b651370156cae979501a7b156bdba50e7ce
F tool/lemon.c 09a96bed19955697a5e20c49ad863ec2005815a2
F tool/lempar.c 57ffa9852901f6abc45981f0d882f31d1ccb06c0
F tool/lempar.c 321ebbf1c85ab5435434042590eca0616da24b3d
F tool/libvers.c caafc3b689638a1d88d44bc5f526c2278760d9b9
F tool/loadfts.c c3c64e4d5e90e8ba41159232c2189dba4be7b862
F tool/logest.c 11346aa019e2e77a00902aa7d0cabd27bd2e8cca
@ -1510,7 +1510,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 14864f2b8470fe98dbd17f59963bf1be8d4962f9
R 3c3d32515aedcf447480f55f3548a5e0
P 9a5a4f6e3bc265fecf79a7f63d14abbf239da636
R fb6cb5f47404a4ca8ae3044e53622029
U drh
Z 4951f1f9d58f89a54689c68080c6d7fb
Z 1ed24d5681cad4ee5c357b2d89914ae1

2
manifest.uuid
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@ -1 +1 @@
9a5a4f6e3bc265fecf79a7f63d14abbf239da636
ba6663beefcc8060e6f3be6ab37c13fdbb08b7de

53
tool/lempar.c
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@ -450,50 +450,47 @@ static unsigned int yy_find_shift_action(
assert( stateno <= YY_SHIFT_COUNT );
do{
i = yy_shift_ofst[stateno];
if( i==YY_SHIFT_USE_DFLT ) return yy_default[stateno];
assert( iLookAhead!=YYNOCODE );
i += iLookAhead;
if( i<0 || i>=YY_ACTTAB_COUNT || yy_lookahead[i]!=iLookAhead ){
if( iLookAhead>0 ){
#ifdef YYFALLBACK
YYCODETYPE iFallback; /* Fallback token */
if( iLookAhead<sizeof(yyFallback)/sizeof(yyFallback[0])
&& (iFallback = yyFallback[iLookAhead])!=0 ){
YYCODETYPE iFallback; /* Fallback token */
if( iLookAhead<sizeof(yyFallback)/sizeof(yyFallback[0])
&& (iFallback = yyFallback[iLookAhead])!=0 ){
#ifndef NDEBUG
if( yyTraceFILE ){
fprintf(yyTraceFILE, "%sFALLBACK %s => %s\n",
yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]);
}
#endif
assert( yyFallback[iFallback]==0 ); /* Fallback loop must terminate */
iLookAhead = iFallback;
continue;
if( yyTraceFILE ){
fprintf(yyTraceFILE, "%sFALLBACK %s => %s\n",
yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]);
}
#endif
assert( yyFallback[iFallback]==0 ); /* Fallback loop must terminate */
iLookAhead = iFallback;
continue;
}
#endif
#ifdef YYWILDCARD
{
int j = i - iLookAhead + YYWILDCARD;
if(
{
int j = i - iLookAhead + YYWILDCARD;
if(
#if YY_SHIFT_MIN+YYWILDCARD<0
j>=0 &&
j>=0 &&
#endif
#if YY_SHIFT_MAX+YYWILDCARD>=YY_ACTTAB_COUNT
j<YY_ACTTAB_COUNT &&
j<YY_ACTTAB_COUNT &&
#endif
yy_lookahead[j]==YYWILDCARD
){
yy_lookahead[j]==YYWILDCARD && iLookAhead>0
){
#ifndef NDEBUG
if( yyTraceFILE ){
fprintf(yyTraceFILE, "%sWILDCARD %s => %s\n",
yyTracePrompt, yyTokenName[iLookAhead],
yyTokenName[YYWILDCARD]);
}
#endif /* NDEBUG */
return yy_action[j];
if( yyTraceFILE ){
fprintf(yyTraceFILE, "%sWILDCARD %s => %s\n",
yyTracePrompt, yyTokenName[iLookAhead],
yyTokenName[YYWILDCARD]);
}
#endif /* NDEBUG */
return yy_action[j];
}
#endif /* YYWILDCARD */
}
#endif /* YYWILDCARD */
return yy_default[stateno];
}else{
return yy_action[i];