changed checkEitherForwardPayload back to Tact

src/benchmarks/results_gas.json

@@ -188,6 +188,19 @@
                 "claimWallet": "3984"
             },
             "summary": "80094"
+        },
+        {
+            "label": "Rewritten checkEitherForwardPayload in Tact",
+            "pr": "https://github.com/tact-lang/jetton/pull/181",
+            "gas": {
+                "transfer": "34098",
+                "mint": "18866",
+                "burn": "12846",
+                "discovery": "5945",
+                "reportBalance": "4308",
+                "claimWallet": "3984"
+            },
+            "summary": "80047"
         }
     ]
 }

src/contracts/utils.tact

@@ -1,17 +1,11 @@
 //  SPDX-License-Identifier: MIT
 //  Copyright © 2025 TON Studio
 
-asm fun checkEitherForwardPayload(forwardPayload: Slice) {
-    LDDICT // Throws 9 if Either bit = 1 and ref is not present
-    SWAP
-    ISNULL
-    <{
-        DROP
-    }> PUSHCONT
-    <{
-        ENDS // Also throws 9 if slice is not empty
-    }> PUSHCONT
-    IFELSE
+inline fun checkEitherForwardPayload(forwardPayload: Slice) {
+    if (forwardPayload.preloadUint(1) == 1) {
+        let bitsAndRefs = calculateSliceBitsAndRefs(forwardPayload);
+        throwUnless(9, (bitsAndRefs.refs == 1) && (bitsAndRefs.bits == 1));
+    }
 }
 
 asm fun emptyAddress(): Address { b{00} PUSHSLICE }