Don't fold -a / -b for unsigned operands.

Thanks to Peter Marreck and Peter Cawley. #1499

1 files changed, 2 insertions, 0 deletions

diff --git a/src/lj_opt_fold.c b/src/lj_opt_fold.c
index 03d869d00..3738f3570 100644
--- a/src/lj_opt_fold.c
+++ b/src/lj_opt_fold.c
@@ -867,6 +867,8 @@ LJFOLD(MUL NEG NEG)
 LJFOLD(DIV NEG NEG)
 LJFOLDF(simplify_nummuldiv_negneg)
 {
+  if (fins->o == IR_DIV && (irt_isu32(fins->t) || irt_isu64(fins->t)))
+    return NEXTFOLD;
   PHIBARRIER(fleft);
   PHIBARRIER(fright);
   fins->op1 = fleft->op1;  /* (-a) o (-b) ==> a o b */