Retract #13048: that introduced a malloc() (through savepvn())

to *every* m//, which killed the performance quite badly.

p4raw-id: //depot/perl@13079

5 files changed, 20 insertions, 16 deletions

diff --git a/pp_hot.c b/pp_hot.c
index 77e070fbb7..f1274a63e4 100644
--- a/pp_hot.c
+++ b/pp_hot.c
@@ -1264,7 +1264,9 @@ PP(pp_match)
 	    }
 	}
     }
-    r_flags |= REXEC_COPY_STR;
+    if ((!global && rx->nparens)
+	    || SvTEMP(TARG) || PL_sawampersand)
+	r_flags |= REXEC_COPY_STR;
     if (SvSCREAM(TARG))
 	r_flags |= REXEC_SCREAM;
 
@@ -1289,7 +1291,7 @@ play_it_again:
 	if (!s)
 	    goto nope;
 	if ( (rx->reganch & ROPT_CHECK_ALL)
-	     && !((rx->reganch & ROPT_SEOL_SEEN) && PL_multiline)
+	     && !PL_sawampersand
 	     && ((rx->reganch & ROPT_NOSCAN)
 		 || !((rx->reganch & RE_INTUIT_TAIL)
 		      && (r_flags & REXEC_SCREAM)))
@@ -1406,12 +1408,19 @@ yup:					/* Confirmed by INTUIT */
 	rx->sublen = strend - truebase;
 	goto gotcha;
     }
+    if (PL_sawampersand) {
+	I32 off;
 
-    rx->sublen = strend - t;
-    rx->subbeg = savepvn(t, rx->sublen);
-    RX_MATCH_COPIED_on(rx);
-    rx->startp[0] = s - truebase;
-    rx->endp[0] = s - truebase + rx->minlen;
+	rx->subbeg = savepvn(t, strend - t);
+	rx->sublen = strend - t;
+	RX_MATCH_COPIED_on(rx);
+	off = rx->startp[0] = s - t;
+	rx->endp[0] = off + rx->minlen;
+    }
+    else {			/* startp/endp are used by @- @+. */
+	rx->startp[0] = s - truebase;
+	rx->endp[0] = s - truebase + rx->minlen;
+    }
     rx->nparens = rx->lastparen = 0;	/* used by @- and @+ */
     LEAVE_SCOPE(oldsave);
     RETPUSHYES;
diff --git a/regcomp.c b/regcomp.c
index eabaa8cfa5..12e03959fd 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -2016,8 +2016,6 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
 	r->reganch |= ROPT_EVAL_SEEN;
     if (RExC_seen & REG_SEEN_CANY)
 	r->reganch |= ROPT_CANY_SEEN;
-    if (RExC_seen & REG_SEEN_SEOL)
-	r->reganch |= ROPT_SEOL_SEEN;
     Newz(1002, r->startp, RExC_npar, I32);
     Newz(1002, r->endp, RExC_npar, I32);
     PL_regdata = r->data; /* for regprop() */
@@ -2796,7 +2794,6 @@ tryagain:
 	    break;
 	case 'Z':
 	    ret = reg_node(pRExC_state, SEOL);
-	    RExC_seen |= REG_SEEN_SEOL;
 	    *flagp |= SIMPLE;
 	    nextchar(pRExC_state);
 	    break;
diff --git a/regcomp.h b/regcomp.h
index 7948853ece..bbe3a41399 100644
--- a/regcomp.h
+++ b/regcomp.h
@@ -311,7 +311,6 @@ struct regnode_charclass_class {	/* has [[:blah:]] classes */
 #define REG_SEEN_EVAL		 8
 #define REG_SEEN_CANY		16
 #define REG_SEEN_SANY		REG_SEEN_CANY /* src bckwrd cmpt */
-#define REG_SEEN_SEOL		32
 
 START_EXTERN_C
 
diff --git a/regexp.h b/regexp.h
index 8366fa25a0..6217aaabfb 100644
--- a/regexp.h
+++ b/regexp.h
@@ -58,7 +58,6 @@ typedef struct regexp {
 #define ROPT_EVAL_SEEN		0x00400
 #define ROPT_CANY_SEEN		0x00800
 #define ROPT_SANY_SEEN		ROPT_CANY_SEEN /* src bckwrd cmpt */
-#define ROPT_SEOL_SEEN		0x01000
 
 /* 0xf800 of reganch is used by PMf_COMPILETIME */
 
diff --git a/t/op/re_tests b/t/op/re_tests
index c7ab5ad814..1e80f5031c 100644
--- a/t/op/re_tests
+++ b/t/op/re_tests
@@ -537,7 +537,7 @@ a$	b\na\n	y	$-[0]	2
 a\Z	b\na	y	$-[0]	2
 a\z	b\na	y	$-[0]	2
 a$	b\na	y	$-[0]	2
-'a\Z'm	a\nb\n	n	-	-
+'a\Z'm	a\nb\n	bn	-	-
 'a\z'm	a\nb\n	n	-	-
 'a$'m	a\nb\n	y	$-[0]	0
 'a\Z'm	b\na\n	y	$-[0]	2
@@ -555,7 +555,7 @@ aa$	b\naa\n	y	$-[0]	2
 aa\Z	b\naa	y	$-[0]	2
 aa\z	b\naa	y	$-[0]	2
 aa$	b\naa	y	$-[0]	2
-'aa\Z'm	aa\nb\n	n	-	-
+'aa\Z'm	aa\nb\n	bn	-	-
 'aa\z'm	aa\nb\n	n	-	-
 'aa$'m	aa\nb\n	y	$-[0]	0
 'aa\Z'm	b\naa\n	y	$-[0]	2
@@ -609,7 +609,7 @@ ab$	b\nab\n	y	$-[0]	2
 ab\Z	b\nab	y	$-[0]	2
 ab\z	b\nab	y	$-[0]	2
 ab$	b\nab	y	$-[0]	2
-'ab\Z'm	ab\nb\n	n	-	-
+'ab\Z'm	ab\nb\n	bn	-	-
 'ab\z'm	ab\nb\n	n	-	-
 'ab$'m	ab\nb\n	y	$-[0]	0
 'ab\Z'm	b\nab\n	y	$-[0]	2
@@ -663,7 +663,7 @@ abb$	b\nabb\n	y	$-[0]	2
 abb\Z	b\nabb	y	$-[0]	2
 abb\z	b\nabb	y	$-[0]	2
 abb$	b\nabb	y	$-[0]	2
-'abb\Z'm	abb\nb\n	n	-	-
+'abb\Z'm	abb\nb\n	bn	-	-
 'abb\z'm	abb\nb\n	n	-	-
 'abb$'m	abb\nb\n	y	$-[0]	0
 'abb\Z'm	b\nabb\n	y	$-[0]	2