From 095326d6e025501478c78ebc898a07c7ffe6184f Mon Sep 17 00:00:00 2001
From: Jonny Rhea <5555162+jrhea@users.noreply.github.com>
Date: Mon, 2 Mar 2026 18:51:31 -0600
Subject: [PATCH] fix code comment

---
 core/vm/instructions.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/vm/instructions.go b/core/vm/instructions.go
index 653c145132..453c8002f6 100644
--- a/core/vm/instructions.go
+++ b/core/vm/instructions.go
@@ -957,8 +957,8 @@ func decodeSingle(x byte) int {
 
 // decodePair decodes the immediate operand of a backward-compatible EXCHANGE
 // instruction (EIP-8024) into stack indices (n, m) where 1 <= n < m
-// and n + m <= 30. There are 210 such valid pairs, encoded into a single byte
-// that avoids the forbidden range [91, 127].
+// and n + m <= 30. The forbidden byte range [82, 127] removes 46 values from
+// the 256 possible immediates, leaving exactly 210 usable bytes.
 func decodePair(x byte) (int, int) {
 	// XOR with 143 remaps the forbidden bytes [82, 127] to an unused corner
 	// of the 16x16 grid below.