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Fix IR_RENAME snapshot number. Follow-up fix for a32aeadc.

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Reported by Victor Bombi, analyzed by XmiliaH. Thanks!
This commit is contained in:
Mike Pall 2021-04-20 17:55:48 +02:00
parent 5374a0a3cf
commit de77205490
1 changed files with 8 additions and 1 deletions
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9
src/lj_asm.c
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@ -697,7 +697,14 @@ static void ra_rename(ASMState *as, Reg down, Reg up)
RA_DBGX((as, "rename $f $r $r", regcost_ref(as->cost[up]), down, up));
emit_movrr(as, ir, down, up); /* Backwards codegen needs inverse move. */
if (!ra_hasspill(IR(ref)->s)) { /* Add the rename to the IR. */
ra_addrename(as, down, ref, as->snapno);
/*
** The rename is effective at the subsequent (already emitted) exit
** branch. This is for the current snapshot (as->snapno). Except if we
** haven't yet allocated any refs for the snapshot (as->snapalloc == 1),
** then it belongs to the next snapshot.
** See also the discussion at asm_snap_checkrename().
*/
ra_addrename(as, down, ref, as->snapno + as->snapalloc);
}
}