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regcomp_invlist.c: Perl_populate_bitmap_from_invlist() optimize asserts #23376

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regcomp_invlist.c: Perl_populate_bitmap_from_invlist() optimize asserts #23376

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8 changes: 7 additions & 1 deletion regcomp_invlist.c
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Original file line number Diff line number Diff line change
Expand Up @@ -23,13 +23,19 @@ void
Perl_populate_bitmap_from_invlist(pTHX_ SV * invlist, const UV offset, const U8 * bitmap, const Size_t len)
{
PERL_ARGS_ASSERT_POPULATE_BITMAP_FROM_INVLIST;
ASSUME(invlist && bitmap);

/* As the name says. The zeroth bit corresponds to the code point given by
* 'offset' */

UV start, end;

Zero(bitmap, len, U8);
if (len == sizeof(U64)
&& ( ((STRUCT_OFFSET(struct regnode_bbm, bitmap) % 8) == 0)
|| (PTR2nat(bitmap) & 0x7) == 0))
*(U64*)bitmap = 0;
else
Zero(bitmap, len, U8);

invlist_iterinit(invlist);
while (invlist_iternext(invlist, &start, &end)) {
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