From: Chris Duncan <chris@codecow.com>
Date: Fri, 21 Aug 2026 20:25:47 +0000 (-0700)
Subject: Reduce down to one scratch object for base point arithmetic.
X-Git-Url: https://git.codecow.com/?a=commitdiff_plain;h=253dd75b62eb37e2baecce9747af8365b6a13ef2;p=nano25519.git

Reduce down to one scratch object for base point arithmetic.
---

diff --git a/src/assembly/ge.ts b/src/assembly/ge.ts
index d48c3ee..ca953a9 100644
--- a/src/assembly/ge.ts
+++ b/src/assembly/ge.ts
@@ -31,28 +31,26 @@ function ge_cmov (t: ge_precomp, u: ge_precomp, b: u8): void {
 	fe_cmov(t.xy2d, u.xy2d, b)
 }
 
-const ge_cmov8_minust: ge_precomp = new ge_precomp()
-const ge_cmov8_precomp: ge_precomp = new ge_precomp()
+const base_precomp: ge_precomp = new ge_precomp()
 //@ts-expect-error
 @inline
 function ge_cmov8_base (t: ge_precomp, offset: i32, b: i8): void {
-	const minust = ge_cmov8_minust
 	const bnegative: u8 = negative(b)
 	const babs: u8 = b - (((-bnegative) & b) * (i8(1) << 1))
 
 	ge_precomp_0(t)
 	for (let i = 0; i < 8; i++) {
-		const ptr = base + offset + (i * 144) // 4 bytes * 12 values * 3 fields
-		memory.copy(changetype<usize>(ge_cmov8_precomp.yplusx), ptr, 48)
-		memory.copy(changetype<usize>(ge_cmov8_precomp.yminusx), ptr + 48, 48)
-		memory.copy(changetype<usize>(ge_cmov8_precomp.xy2d), ptr + 96, 48)
-		ge_cmov(t, ge_cmov8_precomp, equal(babs, i8(i + 1)))
+		const baseptr = base + offset + (i * 144) // 4 bytes * 12 values * 3 fields
+		memory.copy(changetype<usize>(base_precomp.yplusx), baseptr, 48)
+		memory.copy(changetype<usize>(base_precomp.yminusx), baseptr + 48, 48)
+		memory.copy(changetype<usize>(base_precomp.xy2d), baseptr + 96, 48)
+		ge_cmov(t, base_precomp, equal(babs, i8(i + 1)))
 	}
 
-	fe_copy(minust.yplusx, t.yminusx)
-	fe_copy(minust.yminusx, t.yplusx)
-	fe_neg(minust.xy2d, t.xy2d)
-	ge_cmov(t, minust, bnegative)
+	fe_copy(base_precomp.yplusx, t.yminusx)
+	fe_copy(base_precomp.yminusx, t.yplusx)
+	fe_neg(base_precomp.xy2d, t.xy2d)
+	ge_cmov(t, base_precomp, bnegative)
 }
 
 const u: FieldElement = fe()