Fix CONV.num.int sinking.

1 files changed, 12 insertions, 3 deletions

diff --git a/src/lj_asm.c b/src/lj_asm.c
index 4a1af480..5f6becad 100644
--- a/src/lj_asm.c
+++ b/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. */