From 9600e4318e17ef73d73c1980008d648c1c98f959 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Sun, 8 Dec 2019 19:54:21 +0100
Subject: [PATCH] Don't use STRREF for pointer diff in string.find().

Thanks to Sergey Ostanevich and Vyacheslav Egorov.
---
 src/lj_ffrecord.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lj_ffrecord.c b/src/lj_ffrecord.c
index 849d7a27..cb374beb 100644
--- a/src/lj_ffrecord.c
+++ b/src/lj_ffrecord.c
@@ -949,7 +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);
-      pos = emitir(IRTI(IR_SUB), tr, emitir(IRT(IR_STRREF, IRT_PGC), trstr, tr0));
+      /* 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)));
       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;