refactor(stdlib): optimize emptyCell() and emptySlice() for gas (#…

…1696) Co-authored-by: i582 <[email protected]>
tact-lang · Feb 6, 2025 · 6a66c71 · 6a66c71
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diff --git a/dev-docs/CHANGELOG.md b/dev-docs/CHANGELOG.md
@@ -46,6 +46,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Better error message for `unresolved global function` error: PR [#1610](https://github.com/tact-lang/tact/pull/1610)
 - Better error message for `extend function without parameters` error: PR [#1624](https://github.com/tact-lang/tact/pull/1624)
 - Don't generate `lazy_deployment_completed` by default: PR [#1717](https://github.com/tact-lang/tact/pull/1717)
+- Optimized `emptyCell()` and `emptySlice()` functions: PR [#1696](https://github.com/tact-lang/tact/pull/1696)
 
 ### Fixed
 

diff --git a/src/stdlib/stdlib.ts b/src/stdlib/stdlib.ts
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+    "bHVkaW5nIHRoZSBzdGFydGluZyBvbmUKLy8vICogYGJpdHM6IEludGAsIHRoZSB0b3RhbCBudW1iZXIgb2YgYml0cyBpbiBhbGwgbmVzdGVkIGNlbGxzLCBpbmNsdWRp" +
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+    "Ly8gQXR0ZW1wdHMgdG8gc3BlY2lmeSBhIG5lZ2F0aXZlIHZhbHVlIG9mIGBtYXhDZWxsc2AgdGhyb3cgYW4gZXhjZXB0aW9uIHdpdGggZXhpdCBjb2RlIDU6IGBJbnRl" +
+    "Z2VyIG91dCBvZiBleHBlY3RlZCByYW5nZWAuCi8vLwovLy8gYGBgdGFjdAovLy8gZnVuIGV4YW1wbGUoKSB7Ci8vLyAgICAgbGV0IHM6IFNsaWNlID0gYmVnaW5DZWxs" +
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+    "Ly8gICAgICAgICBkYXRhU2l6ZS5yZWZzOyAgLy8gMQovLy8gICAgIH0gY2F0Y2ggKGV4aXRDb2RlKSB7Ci8vLyAgICAgICAgIC8vIGlmIG1heENlbGxzIHdhcyBpbnN1" +
+    "ZmZpY2llbnQgdG8gdHJhdmVyc2UgdGhlIGNlbGwKLy8vICAgICAgICAgLy8gYW5kIGFsbCBvZiBpdHMgcmVmZXJlbmNlcywgdGhlIGV4aXRDb2RlIGhlcmUgd291bGQg" +
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+    "CgovLy8gRXh0ZW5zaW9uIGZ1bmN0aW9uIGZvciB0aGUgYENlbGxgLiBBdmFpbGFibGUgc2luY2UgVGFjdCAxLjYuMC4KLy8vCi8vLyBDb21wdXRlcyBhbmQgcmV0dXJu" +
+    "cyB0aGUgYEludGAgZGVwdGggb2YgdGhlIGBDZWxsYC4gUHJvZHVjZXMgMCBpZiB0aGUgYENlbGxgIGhhcyBubyByZWZlcmVuY2VzLCBvdGhlcndpc2UgMSBwbHVzIHRo" +
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+    "IGZ1biBleGFtcGxlKCkgewovLy8gICAgIGxldCBjOiBDZWxsID0gYmVnaW5DZWxsKCkuc3RvcmVJbnQoNDIsIDcpLmVuZENlbGwoKTsKLy8vICAgICBsZXQgZGVwdGg6" +
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+    "ZGVwdGgKLy8vCmFzbSBleHRlbmRzIGZ1biBkZXB0aChzZWxmOiBDZWxsPyk6IEludCB7IENERVBUSCB9Cgo=";
 files["std/internal/config.tact"] =
     "YXNtIGZ1biBnZXRDb25maWdQYXJhbShpZDogSW50KTogQ2VsbD8geyBDT05GSUdPUFRQQVJBTSB9Cg==";
 files["std/internal/context.tact"] =

diff --git a/src/stdlib/stdlib/std/internal/cells.tact b/src/stdlib/stdlib/std/internal/cells.tact
@@ -467,12 +467,12 @@ inline extends fun asCell(self: Builder): Cell {
     return self.endCell();
 }
 
-inline fun emptyCell(): Cell {
-    return beginCell().endCell();
+asm fun emptyCell(): Cell {
+    <b b> PUSHREF // Pure Fift: "<b" creates a builder, "b>" turns it into a cell at compile time
 }
 
-inline fun emptySlice(): Slice {
-    return emptyCell().asSlice();
+asm fun emptySlice(): Slice {
+    b{} PUSHSLICE
 }
 
 /// Struct for holding values computed by the `Cell.computeDataSize()` and `Slice.computeDataSize()` extension functions. Available since Tact 1.6.0.

diff --git a/src/test/benchmarks/__snapshots__/benchmarks.spec.ts.snap b/src/test/benchmarks/__snapshots__/benchmarks.spec.ts.snap
@@ -1,5 +1,9 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`benchmarks benchmark cells creation: gas used emptyCell 1`] = `931n`;
+
+exports[`benchmarks benchmark cells creation: gas used emptySlice 1`] = `935n`;
+
 exports[`benchmarks benchmark functions: code size 1`] = `211`;
 
 exports[`benchmarks benchmark functions: gas used 1`] = `2769n`;

diff --git a/src/test/benchmarks/benchmarks.spec.ts b/src/test/benchmarks/benchmarks.spec.ts
@@ -16,6 +16,7 @@ import { Sha256Big } from "./contracts/output/benchmark_sha256_big_Sha256Big";
 import { Sha256AsSlice } from "./contracts/output/benchmark_sha256_as_slice_Sha256AsSlice";
 import { Forward } from "./contracts/output/forward_Forward";
 import "@ton/test-utils";
+import { CellsCreation } from "./contracts/output/cells_CellsCreation";
 import { getUsedGas } from "./util";
 
 function measureGas(txs: BlockchainTransaction[]) {
@@ -164,4 +165,25 @@ describe("benchmarks", () => {
             await hashStringAsSLice(sha256AsSlice, "hello world".repeat(10)),
         ).toEqual(2516n);
     });
+
+    it("benchmark cells creation", async () => {
+        const testContract = blockchain.openContract(
+            await CellsCreation.fromInit(),
+        );
+        await testContract.send(
+            treasure.getSender(),
+            { value: toNano(1) },
+            null,
+        );
+
+        const gasUsed1 = (
+            await blockchain.runGetMethod(testContract.address, "emptyCell")
+        ).gasUsed;
+        expect(gasUsed1).toMatchSnapshot("gas used emptyCell");
+
+        const gasUsed2 = (
+            await blockchain.runGetMethod(testContract.address, "emptySlice")
+        ).gasUsed;
+        expect(gasUsed2).toMatchSnapshot("gas used emptySlice");
+    });
 });
diff --git a/src/test/benchmarks/contracts/cells.tact b/src/test/benchmarks/contracts/cells.tact
@@ -0,0 +1,11 @@
+contract CellsCreation {
+    receive() { }
+
+    get fun emptyCell(): Cell {
+        return emptyCell();
+    }
+
+    get fun emptySlice(): Slice {
+        return emptySlice();
+    }
+}