Fix #81424: PCRE2 10.35 JIT performance regression

We backport the respective upstream fix[1] to our bundled pcre2lib plus
the follow-up fix[2] for a functional regression.

[1] <PCRE2Project/pcre2@dc5f966>
[2] <PCRE2Project/pcre2@e7af7ef>

Closes GH-7573.

Author: cmb69

NEWS

@@ -5,6 +5,9 @@ PHP                                                                        NEWS
 - MySQLi:
   . Fixed bug #81494 (Stopped unbuffered query does not throw error). (Nikita)
 
+- PCRE:
+  . Fixed bug #81424 (PCRE2 10.35 JIT performance regression). (cmb)
+
 - Streams:
   . Fixed bug #54340 (Memory corruption with user_filter). (Nikita)
 

ext/pcre/pcre2lib/pcre2_jit_compile.c

@@ -1249,10 +1249,13 @@ SLJIT_ASSERT(*cc == OP_ONCE || *cc == OP_BRA || *cc == OP_CBRA);
 SLJIT_ASSERT(*cc != OP_CBRA || common->optimized_cbracket[GET2(cc, 1 + LINK_SIZE)] != 0);
 SLJIT_ASSERT(start < EARLY_FAIL_ENHANCE_MAX);
 
+next_alt = cc + GET(cc, 1);
+if (*next_alt == OP_ALT)
+  fast_forward_allowed = FALSE;
+
 do
   {
   count = start;
-  next_alt = cc + GET(cc, 1);
   cc += 1 + LINK_SIZE + ((*cc == OP_CBRA) ? IMM2_SIZE : 0);
 
   while (TRUE)
@@ -1521,7 +1524,7 @@ do
         {
         count++;
 
-        if (fast_forward_allowed && *next_alt == OP_KET)
+        if (fast_forward_allowed)
           {
           common->fast_forward_bc_ptr = accelerated_start;
           common->private_data_ptrs[(accelerated_start + 1) - common->start] = ((*private_data_start) << 3) | type_skip;
@@ -1569,8 +1572,8 @@ do
   else if (result < count)
     result = count;
 
-  fast_forward_allowed = FALSE;
   cc = next_alt;
+  next_alt = cc + GET(cc, 1);
   }
 while (*cc == OP_ALT);
 
@@ -11152,7 +11155,7 @@ early_fail_type = (early_fail_ptr & 0x7);
 early_fail_ptr >>= 3;
 
 /* During recursion, these optimizations are disabled. */
-if (common->early_fail_start_ptr == 0)
+if (common->early_fail_start_ptr == 0 && common->fast_forward_bc_ptr == NULL)
   {
   early_fail_ptr = 0;
   early_fail_type = type_skip;

ext/pcre/tests/bug81424a.phpt

@@ -0,0 +1,18 @@
+--TEST--
+Bug #81424 (PCRE2 10.35 JIT performance regression)
+--DESCRIPTION--
+We're testing against the functional regression which has been introduced by
+fixing the performance regression.
+--FILE--
+<?php
+var_dump(
+    preg_match('/(?P<size>\d+)m|M/', "4M", $m),
+    $m
+);
+?>
+--EXPECT--
+int(1)
+array(1) {
+  [0]=>
+  string(1) "M"
+}