Fix CONV.num.int sinking.

src/lj_asm.c

@@ -826,10 +826,19 @@ static void asm_snap_alloc1(ASMState *as, IRRef ref)
 	      asm_snap_alloc1(as, (irs+1)->op2);
 	  }
       }
-    } else if (ir->o == IR_CONV && ir->op2 == IRCONV_NUM_INT) {
-      asm_snap_alloc1(as, ir->op1);
     } else {
-      RegSet allow = (!LJ_SOFTFP && irt_isfp(ir->t)) ? RSET_FPR : RSET_GPR;
+      RegSet allow;
+      if (ir->o == IR_CONV && ir->op2 == IRCONV_NUM_INT) {
+	IRIns *irc;
+	for (irc = IR(as->curins); irc > ir; irc--)
+	  if ((irc->op1 == ref || irc->op2 == ref) &&
+	      !(irc->r == RID_SINK || irc->r == RID_SUNK))
+	    goto nosink;  /* Don't sink conversion if result is used. */
+	asm_snap_alloc1(as, ir->op1);
+	return;
+      }
+    nosink:
+      allow = (!LJ_SOFTFP && irt_isfp(ir->t)) ? RSET_FPR : RSET_GPR;
       if ((as->freeset & allow) ||
 	       (allow == RSET_FPR && asm_snap_canremat(as))) {
 	/* Get a weak register if we have a free one or can rematerialize. */