From 396b52fd6407e022e380490e6d9a5653d9e77dda Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
Date: Sun, 19 Apr 2026 16:35:41 +0000
Subject: report memory access size for "monitor"

---
 CHANGELOG            | 1 +
 src/long_mode/mod.rs | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/CHANGELOG b/CHANGELOG
index 9ae9fd9..97f5216 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -20,6 +20,7 @@
     is unchanged and uses a 16-bit form for source GPR.
 * reject 0f0d prefetch/nop with a register operand, which was incorrectly decoded before.
 * maskmovq and maskmovdqu now have their implicit memory access size reported correctly.
+* monitor now reports the memory access size of the monitored dword/qword.
 
 ## 2.0.0
 
diff --git a/src/long_mode/mod.rs b/src/long_mode/mod.rs
index 5d7180e..de9a323 100644
--- a/src/long_mode/mod.rs
+++ b/src/long_mode/mod.rs
@@ -8296,6 +8296,11 @@ fn read_operands<
                         match m {
                             0b000 => {
                                 instruction.opcode = Opcode::MONITOR;
+                                instruction.mem_size = if instruction.prefixes.address_size() {
+                                    4
+                                } else {
+                                    8
+                                };
                             }
                             0b001 => {
                                 instruction.opcode = Opcode::MWAIT;
-- 
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