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Properly fix pointer diff in string.find().

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Thanks to Vyacheslav Egorov.
This commit is contained in:
Mike Pall 2019-12-21 13:52:47 +01:00
parent bd00094c3b
commit 0bee44c9dc
1 changed files with 2 additions and 2 deletions
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4
src/lj_ffrecord.c
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@ -949,8 +949,8 @@ static void LJ_FASTCALL recff_string_find(jit_State *J, RecordFFData *rd)
str->len-(MSize)start, pat->len)) {
TRef pos;
emitir(IRTG(IR_NE, IRT_PGC), tr, trp0);
/* Don't use STRREF of trstr. We need a pointer diff. */
pos = emitir(IRTI(IR_SUB), emitir(IRTI(IR_SUB), tr, trstr), lj_ir_kint(J, sizeof(GCstr)));
/* Recompute offset. trsptr may not point into trstr after folding. */
pos = emitir(IRTI(IR_ADD), emitir(IRTI(IR_SUB), tr, trsptr), trstart);
J->base[0] = emitir(IRTI(IR_ADD), pos, lj_ir_kint(J, 1));
J->base[1] = emitir(IRTI(IR_ADD), pos, trplen);
rd->nres = 2;