Further cleanup to PCRE

[Eric Seidel (no email)]

Clean up PCRE more so we can make it faster. :)  Going to try attaching a whole bunch of patches to this bug which we can review one at at time.

[Eric Seidel (no email)]

Created attachment 17335 [details]
[PATCH] Clean up jsRegExpExecute

 JavaScriptCore/pcre/pcre_compile.cpp |   12 +-
 JavaScriptCore/pcre/pcre_exec.cpp    |  553 ++++++++++++++++------------------
 JavaScriptCore/pcre/pcre_internal.h  |    6 +-
 3 files changed, 269 insertions(+), 302 deletions(-)

[Eric Seidel (no email)]

Created attachment 17336 [details]
[PATCH] Remove register keyword and more cleanup

 JavaScriptCore/pcre/pcre_compile.cpp  |   97 ++++++++++++---------------
 JavaScriptCore/pcre/pcre_exec.cpp     |  119 +++++++++++++++++++--------------
 JavaScriptCore/pcre/pcre_internal.h   |   92 ++++++++-----------------
 JavaScriptCore/pcre/pcre_ord2utf8.cpp |   25 +++----
 JavaScriptCore/pcre/pcre_xclass.cpp   |   85 ++++++++++++++----------
 5 files changed, 203 insertions(+), 215 deletions(-)

[Eric Seidel (no email)]

Created attachment 17337 [details]
[PATCH] reformat get_othercase_range

 JavaScriptCore/pcre/pcre_compile.cpp |   46 +++++++++++++++++----------------
 1 files changed, 24 insertions(+), 22 deletions(-)

[Eric Seidel (no email)]

Created attachment 17338 [details]
[PATCH] Get rid of PCRE custom char types

 JavaScriptCore/pcre/pcre_compile.cpp |   84 +++++++++++++++------------------
 JavaScriptCore/pcre/pcre_exec.cpp    |   48 ++++++++++----------
 JavaScriptCore/pcre/pcre_internal.h  |   10 +---
 3 files changed, 65 insertions(+), 77 deletions(-)

[Eric Seidel (no email)]

Created attachment 17339 [details]
[PATCH] Fix spacing for read_repeat_counts

 JavaScriptCore/pcre/pcre_compile.cpp |   79 +++++++++++++++++-----------------
 1 files changed, 39 insertions(+), 40 deletions(-)

[Eric Seidel (no email)]

Created attachment 17340 [details]
[PATCH] clean up formating in compile_branch

 JavaScriptCore/pcre/pcre_compile.cpp | 2351 +++++++++++++++++-----------------
 1 files changed, 1145 insertions(+), 1206 deletions(-)

[Eric Seidel (no email)]

Created attachment 17341 [details]
[PATCH] removing more macros

 JavaScriptCore/pcre/pcre_compile.cpp |   36 +++++++++++++++++-----------------
 JavaScriptCore/pcre/pcre_exec.cpp    |   24 +++++++++++-----------
 JavaScriptCore/pcre/pcre_internal.h  |   18 ++++++++--------
 JavaScriptCore/pcre/pcre_xclass.cpp  |    4 +-
 4 files changed, 41 insertions(+), 41 deletions(-)

[Eric Seidel (no email)]

Created attachment 17342 [details]
[PATCH] Clean up compile_branch, move _pcre_ord2utf8, and rename CompileData

 .../JavaScriptCore.xcodeproj/project.pbxproj       |    4 -
 JavaScriptCore/pcre/pcre_compile.cpp               |  110 ++++++++++++--------
 JavaScriptCore/pcre/pcre_internal.h                |   19 ++--
 JavaScriptCore/pcre/pcre_ord2utf8.cpp              |   75 -------------
 4 files changed, 76 insertions(+), 132 deletions(-)

[Eric Seidel (no email)]

Created attachment 17343 [details]
[PATCH] Pass around CompileData& instead of CompileData*

 JavaScriptCore/pcre/pcre_compile.cpp |   69 +++++++++++++++------------------
 1 files changed, 31 insertions(+), 38 deletions(-)

[Eric Seidel (no email)]

Created attachment 17344 [details]
[PATCH] Clean up find_firstassertedchar

 JavaScriptCore/pcre/pcre_compile.cpp |  111 +++++++++++++++++----------------
 1 files changed, 57 insertions(+), 54 deletions(-)

[Eric Seidel (no email)]

Created attachment 17345 [details]
[PATCH] give PCRE_STARTLINE a better name and rename match_data to MatchData

 JavaScriptCore/pcre/pcre_compile.cpp |  160 ++++++++++++++++-----------------
 JavaScriptCore/pcre/pcre_exec.cpp    |   45 +++++-----
 JavaScriptCore/pcre/pcre_internal.h  |    3 +-
 3 files changed, 104 insertions(+), 104 deletions(-)

[Eric Seidel (no email)]

Created attachment 17346 [details]
[PATCH] Pass around MatchData objects by reference

 JavaScriptCore/pcre/pcre_exec.cpp |  294 ++++++++++++++++++------------------
 1 files changed, 147 insertions(+), 147 deletions(-)

[Eric Seidel (no email)]

Created attachment 17347 [details]
[PATCH] Remove unused function could_be_empty_branch

 JavaScriptCore/pcre/pcre_compile.cpp |  155 ++--------------------------------
 1 files changed, 7 insertions(+), 148 deletions(-)

[Eric Seidel (no email)]

Created attachment 17348 [details]
[PATCH] reformat is_anchored

 JavaScriptCore/pcre/pcre_compile.cpp |   62 +++++++++++++++------------------
 1 files changed, 28 insertions(+), 34 deletions(-)

[Eric Seidel (no email)]

Created attachment 17349 [details]
[PATCH] Reformat find_fixedlength

 JavaScriptCore/pcre/pcre_compile.cpp |  281 +++++++++++++++++-----------------
 1 files changed, 143 insertions(+), 138 deletions(-)

[Eric Seidel (no email)]

Created attachment 17350 [details]
[PATCH] clean up check_escape

 JavaScriptCore/pcre/pcre_compile.cpp |  242 +++++++++++++++++-----------------
 1 files changed, 118 insertions(+), 124 deletions(-)

[Eric Seidel (no email)]

Created attachment 17351 [details]
[PATCH] clean up is_counted_repeat

 JavaScriptCore/pcre/pcre_compile.cpp |   44 ++++++++++++++++-----------------
 1 files changed, 21 insertions(+), 23 deletions(-)

[Eric Seidel (no email)]

Created attachment 17352 [details]
[PATCH] split first_significant_code into two simpler functions

 JavaScriptCore/pcre/pcre_compile.cpp |   55 ++++++++++++++++------------------
 1 files changed, 26 insertions(+), 29 deletions(-)

[Eric Seidel (no email)]

Created attachment 17353 [details]
[PATCH] Use better variable names for case ignoring options

 JavaScriptCore/pcre/pcre_compile.cpp |   41 ++++++++++++++++-----------------
 JavaScriptCore/pcre/pcre_exec.cpp    |   36 +++++++++++++++---------------
 JavaScriptCore/pcre/pcre_internal.h  |    4 +-
 3 files changed, 40 insertions(+), 41 deletions(-)

[Eric Seidel (no email)]

Created attachment 17354 [details]
[PATCH] Section off MatchData arguments into args struct

 JavaScriptCore/pcre/pcre_exec.cpp |  728 +++++++++++++++++++------------------
 1 files changed, 367 insertions(+), 361 deletions(-)

[Eric Seidel (no email)]

Created attachment 17355 [details]
[PATCH] Abstract frame variables into locals and args

 JavaScriptCore/pcre/pcre_compile.cpp |    2 +-
 JavaScriptCore/pcre/pcre_exec.cpp    |  465 +++++++++++++++++-----------------
 JavaScriptCore/pcre/pcre_internal.h  |   16 +-
 3 files changed, 244 insertions(+), 239 deletions(-)

[Eric Seidel (no email)]

Created attachment 17356 [details]
[PATCH] cleanup _pcre_ucp_othercase

 JavaScriptCore/pcre/pcre_ucp_searchfuncs.cpp |   69 +++++++++++++------------
 1 files changed, 36 insertions(+), 33 deletions(-)

[Eric Seidel (no email)]

Created attachment 17357 [details]
[PATCH] Add inlines for toLowerCase, isWordChar, isSpaceChar for further regexp speedup

 JavaScriptCore/pcre/pcre_compile.cpp |   22 +++++-----
 JavaScriptCore/pcre/pcre_exec.cpp    |   75 +++++++++++++++-------------------
 JavaScriptCore/pcre/pcre_internal.h  |   56 ++++++++++++++++---------
 JavaScriptCore/pcre/pcre_xclass.cpp  |    3 +-
 4 files changed, 81 insertions(+), 75 deletions(-)

[Eric Seidel (no email)]

Created attachment 17358 [details]
[PATCH] Give GET, PUT better names, and add (poor) moveOpcodePtrPastAnyAlternateBranches

 JavaScriptCore/pcre/pcre_compile.cpp         |  120 +++++++++++++-------------
 JavaScriptCore/pcre/pcre_exec.cpp            |   62 ++++++-------
 JavaScriptCore/pcre/pcre_internal.h          |   47 ++++++----
 JavaScriptCore/pcre/pcre_ucp_searchfuncs.cpp |    4 +-
 4 files changed, 117 insertions(+), 116 deletions(-)

[Eric Seidel (no email)]

Created attachment 17359 [details]
[PATCH] Further cleanup GET/PUT inlines

 JavaScriptCore/pcre/pcre_internal.h |   49 ++++++++++++++++++-----------------
 1 files changed, 25 insertions(+), 24 deletions(-)

[Eric Seidel (no email)]

Created attachment 17360 [details]
[PATCH] Get rid of GETCHAR* macros, replacing them with better named inlines

 JavaScriptCore/pcre/pcre_compile.cpp |   33 ++++------
 JavaScriptCore/pcre/pcre_exec.cpp    |  112 +++++++++++++++++-----------------
 JavaScriptCore/pcre/pcre_internal.h  |   55 ++++++++++++-----
 3 files changed, 106 insertions(+), 94 deletions(-)

[Eric Seidel (no email)]

Created attachment 17361 [details]
[PATCH] Remove redundant match_call_count and move recursion check out of super-hot code path

SunSpider says this is at least an 8% speedup for regexp.
---
 JavaScriptCore/pcre/pcre_exec.cpp   |   33 ++++++++++-----------------------
 JavaScriptCore/pcre/pcre_internal.h |   25 +++++--------------------
 2 files changed, 15 insertions(+), 43 deletions(-)

[Eric Seidel (no email)]

Created attachment 17362 [details]
[PATCH] Remove redundant eptrblock struct

 JavaScriptCore/pcre/pcre_exec.cpp |   99 ++++++++++++++----------------------
 1 files changed, 39 insertions(+), 60 deletions(-)

[Eric Seidel (no email)]

So I've not marked any of these for review.  But anyone who would like to go through and review them, that would be most appreciated. :)

Hum... I might need to make white-space ignoring versions.

[Sam Weinig]

Comment on attachment 17337 [details]
[PATCH] reformat get_othercase_range

The *'s should be next to the type here.

+static bool get_othercase_range(int *cptr, int d, int *ocptr, int *odptr)

Needs changelog.  Otherwise, r=me.

[Sam Weinig]

Comment on attachment 17339 [details]
[PATCH] Fix spacing for read_repeat_counts

Needs ChangeLog
r=me.

[Sam Weinig]

Comment on attachment 17344 [details]
[PATCH] Clean up find_firstassertedchar

r=me.  Changelog please

[Sam Weinig]

Comment on attachment 17348 [details]
[PATCH] reformat is_anchored

We generally spell unsigned int as unsigned.  Otherwise, r=me with a log of changes.

[Sam Weinig]

Comment on attachment 17351 [details]
[PATCH] clean up is_counted_repeat

r=me with ChangeLog.

[Sam Weinig]

Comment on attachment 17352 [details]
[PATCH] split first_significant_code into two simpler functions

The * should go next to the type here.
+        const uschar *scode = firstSignificantOpCode(code + 1 + LINK_SIZE);

r=me with ChangeLog.

[Sam Weinig]

Comment on attachment 17356 [details]
[PATCH] cleanup _pcre_ucp_othercase

In the other patches I have reviewed so far you are changing infinite loops like
+    for (;;) {
to while (true).  I think it is better to be consistent and change this one as well.

r=me with ChangeLog.

[Sam Weinig]

Comment on attachment 17359 [details]
[PATCH] Further cleanup GET/PUT inlines

r=me with the ChangeLog

[Sam Weinig]

Comment on attachment 17341 [details]
[PATCH] removing more macros

r=me with ChangeLog.

[Sam Weinig]

Comment on attachment 17338 [details]
[PATCH] Get rid of PCRE custom char types

The typedef for USPTR was const UChar* but you seem to be using a non-const version in most places you replaced it.  What was the motivation behind that change.  Otherwise, r=me with a ChangeLog.

[Sam Weinig]

Comment on attachment 17349 [details]
[PATCH] Reformat find_fixedlength

The * should go next to the type here.
+static int find_fixedlength(uschar *code, int options)

and here
+    uschar *cc = code + 1 + LINK_SIZE;

I think should be while (true) for consistency.
+    for (;;) {

Brace should go on the same line as the switch statement.
+        switch (op)
+        {

I think spliting this onto multiple lines will make it more clear. (appears twice)
+                do cc += GET(cc, 1); while (*cc == OP_ALT);

In the inner switch statement you indent the cases differently than the outer switch.  Consistency is the key.
+                switch (*cc) {
+                case OP_CRSTAR:

r-

[Sam Weinig]

Comment on attachment 17350 [details]
[PATCH] clean up check_escape

I am not a fan of multiple case statements on a line but I don't think we have a rule about this.
+        case '1': case '2': case '3': case '4': case '5':
+        case '6': case '7': case '8': case '9':

r=me.

[Sam Weinig]

Comment on attachment 17345 [details]
[PATCH] give PCRE_STARTLINE a better name and rename match_data to MatchData

r=me with ChangeLoggy.

[Sam Weinig]

Comment on attachment 17342 [details]
[PATCH] Clean up compile_branch, move _pcre_ord2utf8, and rename CompileData

r=me

[Eric Seidel (no email)]

Created attachment 17376 [details]
[PATCH] Remove match_is_group variable for another 5% speedup

 JavaScriptCore/pcre/pcre_compile.cpp |    1 +
 JavaScriptCore/pcre/pcre_exec.cpp    |  143 +++++++++++++++------------------
 2 files changed, 66 insertions(+), 78 deletions(-)

[Eric Seidel (no email)]

Created attachment 17377 [details]
[PATCH] Lower MATCH_LIMIT_RECURSION to more sane levels to prevent hangs on run-javascriptcore-tests

 JavaScriptCore/pcre/pcre_internal.h |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

[Eric Seidel (no email)]

Created attachment 17378 [details]
[PATCH] Small speedup (0.7%) by simplifying canUseStackBufferForNextFrame() check

 JavaScriptCore/pcre/pcre_exec.cpp |   20 +++++++++-----------
 1 files changed, 9 insertions(+), 11 deletions(-)

[Eric Seidel (no email)]

Created attachment 17379 [details]
[PATCH] Give subjectPtr and instructionPtr sane names, reduce size of MatchFrame for a 0.2% speedup.

 JavaScriptCore/pcre/pcre_compile.cpp |   15 +-
 JavaScriptCore/pcre/pcre_exec.cpp    |  653 +++++++++++++++++-----------------
 JavaScriptCore/pcre/pcre_internal.h  |   38 +-
 JavaScriptCore/pcre/pcre_xclass.cpp  |    6 +-
 4 files changed, 355 insertions(+), 357 deletions(-)

[Eric Seidel (no email)]

Created attachment 17380 [details]
[PATCH] Comment cleanup

 JavaScriptCore/pcre/pcre_exec.cpp |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

[Eric Seidel (no email)]

Created attachment 17381 [details]
[PATCH] Make i locally scoped for better code clarity

 JavaScriptCore/pcre/pcre_exec.cpp |   64 ++++++++++++++++++-------------------
 1 files changed, 31 insertions(+), 33 deletions(-)

[Eric Seidel (no email)]

Created attachment 17382 [details]
[PATCH] change getChar* functions to return result and push 'c' into local scopes for clarity

 JavaScriptCore/pcre/pcre_compile.cpp |   13 ++--
 JavaScriptCore/pcre/pcre_exec.cpp    |  138 ++++++++++++++++------------------
 JavaScriptCore/pcre/pcre_internal.h  |   25 ++++---
 3 files changed, 87 insertions(+), 89 deletions(-)

[Eric Seidel (no email)]

Created attachment 17383 [details]
[PATCH] Remove no longer used error code JSRegExpErrorMatchLimit

 JavaScriptCore/kjs/regexp.cpp       |    2 +-
 JavaScriptCore/pcre/pcre.h          |    1 -
 JavaScriptCore/pcre/pcre_internal.h |    2 +-
 3 files changed, 2 insertions(+), 3 deletions(-)

[Eric Seidel (no email)]

Created attachment 17384 [details]
[PATCH] Add repeatInformationFromInstructionOffset inline

 JavaScriptCore/pcre/pcre_exec.cpp |   63 ++++++++++++------------------------
 1 files changed, 21 insertions(+), 42 deletions(-)

[Eric Seidel (no email)]

Created attachment 17385 [details]
[PATCH] Remove branch from return

 JavaScriptCore/pcre/pcre_compile.cpp |    6 ++++--
 JavaScriptCore/pcre/pcre_exec.cpp    |    3 ++-
 2 files changed, 6 insertions(+), 3 deletions(-)

[Eric Seidel (no email)]

Created attachment 17386 [details]
[PATCH] Change _NC operators to use _IGNORING_CASE for clarity

 JavaScriptCore/pcre/pcre_compile.cpp |   16 ++++++++--------
 JavaScriptCore/pcre/pcre_exec.cpp    |    4 ++--
 JavaScriptCore/pcre/pcre_internal.h  |    4 ++--
 3 files changed, 12 insertions(+), 12 deletions(-)

[Eric Seidel (no email)]

Created attachment 17387 [details]
[PATCH] Make cur_is_word and prev_is_word locals, and change OP_ANY to OP_ANY_CHAR for clarity

 JavaScriptCore/pcre/pcre_compile.cpp |    8 ++++----
 JavaScriptCore/pcre/pcre_exec.cpp    |   15 +++++++++------
 JavaScriptCore/pcre/pcre_internal.h  |    4 ++--
 3 files changed, 15 insertions(+), 12 deletions(-)

[Eric Seidel (no email)]

Created attachment 17388 [details]
[PATCH] Centralize code for subjectPtr adjustments using inlines, only ever check for a single trailing surrogate (as UTF16 only allows one), possibly fix PCRE bugs involving char classes and garbled UTF16 strings.

 JavaScriptCore/pcre/pcre_exec.cpp   |   94 +++++++++++++++--------------------
 JavaScriptCore/pcre/pcre_internal.h |   35 +++++++++++++-
 2 files changed, 74 insertions(+), 55 deletions(-)

[Eric Seidel (no email)]

Created attachment 17389 [details]
[PATCH] Deprecate jsRegExpExecute's offset-vector fallback code

 JavaScriptCore/pcre/pcre_exec.cpp |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

[Eric Seidel (no email)]

Created attachment 17390 [details]
[PATCH] give PCRE_MULTILINE a better name: OptionMatchAcrossMultipleLines

 JavaScriptCore/pcre/pcre_compile.cpp |    8 ++++----
 JavaScriptCore/pcre/pcre_exec.cpp    |    2 +-
 JavaScriptCore/pcre/pcre_internal.h  |    2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

[Eric Seidel (no email)]

Created attachment 17391 [details]
[PATCH] Pull first_byte and req_byte optimizations out into separate static funtions, SunSpider reported this as a win.

 JavaScriptCore/pcre/pcre_exec.cpp   |  186 ++++++++++++++++------------------
 JavaScriptCore/pcre/pcre_internal.h |   18 ++--
 2 files changed, 99 insertions(+), 105 deletions(-)

[Eric Seidel (no email)]

Created attachment 17392 [details]
[PATCH] Give consistent naming to the RegExp options/compile flags

 JavaScriptCore/pcre/pcre_compile.cpp |   48 +++++++++++++++++-----------------
 JavaScriptCore/pcre/pcre_exec.cpp    |   10 +++---
 JavaScriptCore/pcre/pcre_internal.h  |   16 +++++-----
 3 files changed, 37 insertions(+), 37 deletions(-)

[Eric Seidel (no email)]

Ok.  I'm ready to start landing these suckers.  After all these patches, RegExp is 18.8% faster.  Other tests are randomly slower and faster.  None of them beyond 2.7% slower (controlflow-recursive) or 2.9% faster (math-cordic).  These are all tests which have nothing to to with RegExps.

Getting this in will allow others (like darin, ggaren) to pick off some of the remaining low-hanging fruit in the RegExp engine (now that one can actually begin to tell what the code is trying to do!)

If you would like any of the patches re-attached in a white-space ignoring form (or if you'd like a combined patch) I'm happy to provide.  I hope this "do lots of work in git and upload all the little patches" approach is a help, not a hinderance.  I plan to land these all individually (with changelogs), as then it's very easy to track any accidental regressions.

[Maciej Stachowiak]

Comment on attachment 17347 [details]
[PATCH] Remove unused function could_be_empty_branch

r=me

[Eric Seidel (no email)]

unccing darin to curb the flood of email to his inbox

[Maciej Stachowiak]

Comment on attachment 17335 [details]
[PATCH] Clean up jsRegExpExecute

r=me

[Maciej Stachowiak]

Comment on attachment 17336 [details]
[PATCH] Remove register keyword and more cleanup

r=me

[Maciej Stachowiak]

Comment on attachment 17340 [details]
[PATCH] clean up formating in compile_branch

r=me

[Eric Seidel (no email)]

Created attachment 17393 [details]
[PATCH] Further cleanups to calculateCompiledPatternLengthAndFlags

 JavaScriptCore/pcre/pcre_compile.cpp |  154 +++++++++++++++++-----------------
 JavaScriptCore/pcre/pcre_internal.h  |    2 +-
 2 files changed, 79 insertions(+), 77 deletions(-)

[Eric Seidel (no email)]

Created attachment 17394 [details]
Combined patch for Maciej's viewing pleasure

Here is a combined patch of all preceding patches for folks to try on their own machines.  (I'm still looking  for individual patch reviews, and plan to land them individually.)

[Maciej Stachowiak]

Comment on attachment 17390 [details]
[PATCH] give PCRE_MULTILINE a better name: OptionMatchAcrossMultipleLines

r=me

[Maciej Stachowiak]

Comment on attachment 17353 [details]
[PATCH] Use better variable names for case ignoring options

r=me

[Eric Seidel (no email)]

I just updated to TOT and re-timed.  SunSpider now claims this total patch is a 1.1% speedup.

[Sam Weinig]

Comment on attachment 17346 [details]
[PATCH] Pass around MatchData objects by reference

r=me.

This comment could be slightly altered now that you are passing by reference.
   md          pointer to matching data block, if is_subject is true

[Sam Weinig]

Comment on attachment 17392 [details]
[PATCH] Give consistent naming to the RegExp options/compile flags

r=me

[Sam Weinig]

Comment on attachment 17357 [details]
[PATCH] Add inlines for toLowerCase, isWordChar, isSpaceChar for further regexp speedup

r=me

[Sam Weinig]

Comment on attachment 17360 [details]
[PATCH] Get rid of GETCHAR* macros, replacing them with better named inlines

r=me

[Sam Weinig]

Comment on attachment 17380 [details]
[PATCH] Comment cleanup

r=me

[Sam Weinig]

Comment on attachment 17358 [details]
[PATCH] Give GET, PUT better names, and add (poor) moveOpcodePtrPastAnyAlternateBranches

r=me

[Sam Weinig]

Comment on attachment 17362 [details]
[PATCH] Remove redundant eptrblock struct

r=me

[Sam Weinig]

Comment on attachment 17354 [details]
[PATCH] Section off MatchData arguments into args struct

For this and http://bugs.webkit.org/attachment.cgi?id=17355 I would like to see some performance numbers to make sure this restructuring did not regress us in any way.  r-

[Sam Weinig]

Comment on attachment 17355 [details]
[PATCH] Abstract frame variables into locals and args

r- for same reason as above.

[Sam Weinig]

Comment on attachment 17377 [details]
[PATCH] Lower MATCH_LIMIT_RECURSION to more sane levels to prevent hangs on run-javascriptcore-tests

r=me

[Sam Weinig]

Comment on attachment 17378 [details]
[PATCH] Small speedup (0.7%) by simplifying canUseStackBufferForNextFrame() check

This looks good but I think you can use a static const instead of the #define
+#define FRAMES_ON_STACK 16

r=me otherwise.

[Sam Weinig]

Comment on attachment 17391 [details]
[PATCH] Pull first_byte and req_byte optimizations out into separate static funtions, SunSpider reported this as a win.

There are a few style issues in tryFirstByteOptimization:

Brace after if.
+        if (first_byte_caseless)
+            while (subjectPtr < endSubject) {

braces after the else
+        else
+            while (subjectPtr < endSubject && *subjectPtr != first_char)
+                subjectPtr++;


Else on the same line as the brace.
+    }
+    /* Or to just after \n for a multiline match if possible */
+    else if (useMultiLineFirstCharOptimization) {

r=me

[Sam Weinig]

Comment on attachment 17393 [details]
[PATCH] Further cleanups to calculateCompiledPatternLengthAndFlags

r=me

[Sam Weinig]

Comment on attachment 17381 [details]
[PATCH] Make i locally scoped for better code clarity

Bad bad Eric.  This code will decrement the i counter twice as much.  Also, the indenting is off.
-    i = 255;
-    while (!opcode_jump_table[i])
-        opcode_jump_table[i--] = &&CAPTURING_BRACKET;
+    for (int i = 255; !opcode_jump_table[i]; i--)
+            opcode_jump_table[i--] = &&CAPTURING_BRACKET;

Otherwise, this looks great.  r=me.

[Sam Weinig]

Comment on attachment 17383 [details]
[PATCH] Remove no longer used error code JSRegExpErrorMatchLimit

I think if you remove a error code it is a good idea to make the range continuous again (make JSRegExpErrorRecursionLimit = -4)
as we aren't keeping any kind of compatibility here.

This change seems like it should go in the patch that originally made the comment.
- Currently that's 100000 - 16 * (23 * 4)  ~ 9MB
+ Currently that's 100000 - 16 * (23 * 4)  ~ 90MB

r-

[Sam Weinig]

Comment on attachment 17385 [details]
[PATCH] Remove branch from return

r=me

Comment on attachment 17386 [details]
[PATCH] Change _NC operators to use _IGNORING_CASE for clarity

r=me

[Maciej Stachowiak]

Comment on attachment 17361 [details]
[PATCH] Remove redundant match_call_count and move recursion check out of super-hot code path

r=me

Comment on attachment 17387 [details]
[PATCH] Make cur_is_word and prev_is_word locals, and change OP_ANY to OP_ANY_CHAR for clarity

r=me

[Maciej Stachowiak]

Comment on attachment 17387 [details]
[PATCH] Make cur_is_word and prev_is_word locals, and change OP_ANY to OP_ANY_CHAR for clarity

r=me

[Maciej Stachowiak]

Comment on attachment 17384 [details]
[PATCH] Add repeatInformationFromInstructionOffset inline

r=me

[Maciej Stachowiak]

Comment on attachment 17376 [details]
[PATCH] Remove match_is_group variable for another 5% speedup

r=me

[Maciej Stachowiak]

Comment on attachment 17379 [details]
[PATCH] Give subjectPtr and instructionPtr sane names, reduce size of MatchFrame for a 0.2% speedup.

r=me

[Maciej Stachowiak]

Comment on attachment 17379 [details]
[PATCH] Give subjectPtr and instructionPtr sane names, reduce size of MatchFrame for a 0.2% speedup.


You should fix the indentation here:

   offset      index into the offset vector
-  eptr        points into the subject
+  subjectPtr        points into the subject
   length      length to be matched

[Eric Seidel (no email)]

(In reply to comment #40)
> (From update of attachment 17349 [details] [edit])
> r-

I fixed all your issues except for the case indenting.  That will have to go on a later patch, as a I fear it would break all dependent patches in my tree.  Sadly, you're not around on IRC, but I'm going to assume you're OK with this.  this is git, so I can always go back and change it. :)

[Maciej Stachowiak]

Comment on attachment 17382 [details]
[PATCH] change getChar* functions to return result and push 'c' into local scopes for clarity

r=me

[Maciej Stachowiak]

Comment on attachment 17388 [details]
[PATCH] Centralize code for subjectPtr adjustments using inlines, only ever check for a single trailing surrogate (as UTF16 only allows one), possibly fix PCRE bugs involving char classes and garbled UTF16 strings.

r=me

[Eric Seidel (no email)]

Ok.  I made the suggested changes, added ChangeLogs to each commit, and rechecked performance.  The final number was a 1.7% improvement (some of that is caused by positive noise in the results).

Going to land this in a minute.

The final perf numbers:

TEST                   COMPARISON            FROM                 TO             DETAILS

=============================================================================

** TOTAL **:           1.7% faster     4320.6ms +/- 0.3%   4249.0ms +/- 0.2%     significant

=============================================================================

  3d:                  -                500.2ms +/- 0.4%    498.0ms +/- 0.4% 
    cube:              -                168.2ms +/- 1.0%    166.4ms +/- 0.9% 
    morph:             ??               161.4ms +/- 0.4%    161.6ms +/- 0.4%     not conclusive: might be 0.1% *slower*
    raytrace:          0.4% faster      170.6ms +/- 0.4%    170.0ms +/- 0.0%     significant

  access:              1.3% faster      716.4ms +/- 0.4%    707.0ms +/- 0.4%     significant
    binary-trees:      ??               105.4ms +/- 0.6%    105.6ms +/- 0.6%     not conclusive: might be 0.2% *slower*
    fannkuch:          1.8% faster      348.8ms +/- 0.3%    342.6ms +/- 0.4%     significant
    nbody:             1.6% faster      184.0ms +/- 0.8%    181.0ms +/- 0.5%     significant
    nsieve:            -                 78.2ms +/- 0.7%     77.8ms +/- 0.7% 

  bitops:              -                611.2ms +/- 0.2%    611.0ms +/- 0.2% 
    3bit-bits-in-byte: ??               111.8ms +/- 0.5%    112.0ms +/- 1.1%     not conclusive: might be 0.2% *slower*
    bits-in-byte:      -                150.0ms +/- 0.6%    149.8ms +/- 0.4% 
    bitwise-and:       -                214.0ms +/- 0.0%    214.0ms +/- 0.0% 
    nsieve-bits:       -                135.4ms +/- 0.5%    135.2ms +/- 0.4% 

  controlflow:         -                151.0ms +/- 0.0%    151.0ms +/- 0.0% 
    recursive:         -                151.0ms +/- 0.0%    151.0ms +/- 0.0% 

  crypto:              -                339.8ms +/- 0.5%    340.0ms +/- 0.5% 
    aes:               1.4% *slower*     97.2ms +/- 0.6%     98.6ms +/- 0.7%     significant
    md5:               -                121.2ms +/- 0.5%    121.2ms +/- 0.9% 
    sha1:              1.0% faster      121.4ms +/- 0.6%    120.2ms +/- 0.9%     significant

  date:                0.8% faster      371.8ms +/- 0.3%    369.0ms +/- 0.8%     significant
    format-tofte:      0.9% *slower*    163.8ms +/- 0.3%    165.2ms +/- 1.6%     significant
    format-xparb:      2.0% faster      208.0ms +/- 0.4%    203.8ms +/- 0.3%     significant

  math:                0.4% faster      509.2ms +/- 0.2%    507.0ms +/- 0.5%     significant
    cordic:            0.8% faster      216.0ms +/- 0.4%    214.2ms +/- 0.8%     significant
    partial-sums:      -                172.8ms +/- 0.3%    172.2ms +/- 0.6% 
    spectral-norm:     ??               120.4ms +/- 0.6%    120.6ms +/- 0.6%     not conclusive: might be 0.2% *slower*

  regexp:              18.0% faster     268.2ms +/- 0.4%    220.0ms +/- 0.4%     significant
    dna:               18.0% faster     268.2ms +/- 0.4%    220.0ms +/- 0.4%     significant

  string:              0.8% faster      852.8ms +/- 0.5%    846.0ms +/- 0.4%     significant
    base64:            0.8% faster      121.4ms +/- 0.6%    120.4ms +/- 0.6%     significant
    fasta:             1.2% faster      205.0ms +/- 0.6%    202.6ms +/- 0.3%     significant
    tagcloud:          ??               191.8ms +/- 0.8%    192.4ms +/- 0.4%     not conclusive: might be 0.3% *slower*
    unpack-code:       1.5% faster      199.0ms +/- 0.4%    196.0ms +/- 0.4%     significant
    validate-input:    -                135.6ms +/- 0.8%    134.6ms +/- 1.9%