From: Chris Duncan <chris@zoso.dev>
Date: Sun, 17 Aug 2025 09:55:00 +0000 (-0700)
Subject: Unroll loop to eliminate branching.
X-Git-Tag: v0.10.5~41^2~86
X-Git-Url: https://git.codecow.com/?a=commitdiff_plain;h=68b96eb80667d6dc22da74fd29c5962dd16a4a2b;p=libnemo.git

Unroll loop to eliminate branching.
---

diff --git a/src/lib/crypto/nano-nacl.ts b/src/lib/crypto/nano-nacl.ts
index c1e401d..104e5af 100644
--- a/src/lib/crypto/nano-nacl.ts
+++ b/src/lib/crypto/nano-nacl.ts
@@ -62,12 +62,18 @@ export class NanoNaCl {
 	static inv25519 (out: Float64Array, i: Float64Array): void {
 		const c: Float64Array = new Float64Array(16)
 		c.set(i.subarray(0, 16), 0)
-		for (let a = 253; a >= 0; a--) {
+		for (let a = 0; a < 249; a++) {
 			this.Square(c, c)
-			if (a !== 2 && a !== 4) {
-				this.Multiply(c, c, i)
-			}
+			this.Multiply(c, c, i)
 		}
+		this.Square(c, c)
+		this.Square(c, c)
+		this.Multiply(c, c, i)
+		this.Square(c, c)
+		this.Square(c, c)
+		this.Multiply(c, c, i)
+		this.Square(c, c)
+		this.Multiply(c, c, i)
 		out.set(c, 0)
 	}