From: Spider Boardman <spider@Orb.Nashua.NH.US>
Date: Mon, 30 Sep 1996 05:13:28 +0000 (-0400)
Subject: Re: pre extending hash? - need speed
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=85581909df34d9ffca6c85cafeb2595c4cb89ffb;p=platform%2Fupstream%2Fperl.git

Re: pre extending hash? - need speed

The patch below (which is relative to perl5.001l) implements
"keys %hash = 50_000;" (or other integer-evaluable sizes) for
pre-sizing hashes.  I've only moved the patch forward from
when I first did it.  I'm sure the code in hv_ksplit could be
improved.
---

diff --git a/doop.c b/doop.c
index 470ec06..0d8538c 100644
--- a/doop.c
+++ b/doop.c
@@ -629,8 +629,15 @@ dARGS
     if (op->op_type == OP_RV2HV || op->op_type == OP_PADHV) 
 	dokeys = dovalues = TRUE;
 
-    if (!hv)
+    if (!hv) {
+	if (op->op_flags & OPf_MOD) {	/* lvalue */
+	    dTARGET;		/* make sure to clear its target here */
+	    if (SvTYPE(TARG) == SVt_PVLV)
+		LvTARG(TARG) = Nullsv;
+	    PUSHs(TARG);
+	}
 	RETURN;
+    }
 
     (void)hv_iterinit(hv);	/* always reset iterator regardless */
 
@@ -638,6 +645,17 @@ dARGS
 	I32 i;
 	dTARGET;
 
+	if (op->op_flags & OPf_MOD) {	/* lvalue */
+	    if (SvTYPE(TARG) < SVt_PVLV) {
+		sv_upgrade(TARG, SVt_PVLV);
+		sv_magic(TARG, Nullsv, 'k', Nullch, 0);
+	    }
+	    LvTYPE(TARG) = 'k';
+	    LvTARG(TARG) = (SV*)hv;
+	    PUSHs(TARG);
+	    RETURN;
+	}
+
 	if (!SvRMAGICAL(hv) || !mg_find((SV*)hv,'P'))
 	    i = HvKEYS(hv);
 	else {