Return of the IVUV-preservation, now seems to be happy even

in Digital UNIX (the broken strtoul brokenness detection
seems to have been the fly in the ointment).

p4raw-id: //depot/perl@8138

1 files changed, 5 insertions, 7 deletions

diff --git a/op.c b/op.c
index b6a9c7c04f..e6f7804e9d 100644
--- a/op.c
+++ b/op.c
@@ -2249,13 +2249,11 @@ Perl_fold_constants(pTHX_ register OP *o)
 	if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK &&
 	    type != OP_NEGATE)
 	{
-	    IV iv = SvIV(sv);
-	    if ((NV)iv == SvNV(sv)) {
-		SvREFCNT_dec(sv);
-		sv = newSViv(iv);
-	    }
-	    else
-		SvIOK_off(sv);			/* undo SvIV() damage */
+#ifdef PERL_PRESERVE_IVUV
+	    /* Only bother to attempt to fold to IV if
+	       most operators will benefit  */
+	    SvIV_please(sv);
+#endif
 	}
 	return newSVOP(OP_CONST, 0, sv);
     }