Minor improvements of optimizations.

src/lj_asm.c

@@ -2319,13 +2319,23 @@ static void asm_setup_regsp(ASMState *as)
       }
       /* fallthrough */ /* for integer POW */
     case IR_DIV: case IR_MOD:
-      if (!irt_isnum(ir->t)) {
+      if ((LJ_64 && LJ_SOFTFP) || !irt_isnum(ir->t)) {
 	ir->prev = REGSP_HINT(RID_RET);
 	if (inloop)
 	  as->modset |= (RSET_SCRATCH & RSET_GPR);
 	continue;
       }
       break;
+#if LJ_64 && LJ_SOFTFP
+    case IR_ADD: case IR_SUB: case IR_MUL:
+      if (irt_isnum(ir->t)) {
+	ir->prev = REGSP_HINT(RID_RET);
+	if (inloop)
+	  as->modset |= (RSET_SCRATCH & RSET_GPR);
+	continue;
+      }
+      break;
+#endif
     case IR_FPMATH:
 #if LJ_TARGET_X86ORX64
       if (ir->op2 <= IRFPM_TRUNC) {

src/lj_opt_fold.c

@@ -514,6 +514,7 @@ LJFOLDF(kfold_snew_kptr)
 }
 
 LJFOLD(SNEW any KINT)
+LJFOLD(XSNEW any KINT)
 LJFOLDF(kfold_snew_empty)
 {
   if (fright->i == 0)
@@ -1301,6 +1302,10 @@ LJFOLD(CONV SUB IRCONV_U32_U64)
 LJFOLD(CONV MUL IRCONV_U32_U64)
 LJFOLDF(simplify_conv_narrow)
 {
+#if LJ_64
+  UNUSED(J);
+  return NEXTFOLD;
+#else
   IROp op = (IROp)fleft->o;
   IRType t = irt_type(fins->t);
   IRRef op1 = fleft->op1, op2 = fleft->op2, mode = fins->op2;
@@ -1311,6 +1316,7 @@ LJFOLDF(simplify_conv_narrow)
   fins->op1 = op1;
   fins->op2 = op2;
   return RETRYFOLD;
+#endif
 }
 
 /* Special CSE rule for CONV. */