From 9b3c56c0e62c3d1c27ffef4b8021663798b73ca7 Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
Date: Sun, 26 Jul 2026 17:56:26 +0000
Subject: thumb: when nonconforming, allow it/cond=1111 like capstone

---
 src/armv7/thumb.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'src/armv7/thumb.rs')

diff --git a/src/armv7/thumb.rs b/src/armv7/thumb.rs
index 7aa3a5d..9e9c30a 100644
--- a/src/armv7/thumb.rs
+++ b/src/armv7/thumb.rs
@@ -3918,8 +3918,13 @@ pub fn decode_into<T: Reader<<ARMv7 as Arch>::Address, <ARMv7 as Arch>::Word>>(d
                     let firstcond = opa;
                     let mask = opb;
                     inst.opcode = Opcode::IT;
-                    if firstcond == 0b1111 {
-                        return Err(DecodeError::InvalidOperand);
+                    if decoder.should_is_must {
+                        // > if firstcond == ‘1111’ ||
+                        // >    (firstcond == ‘1110’ && BitCount(mask) != 1)
+                        // > then UNPREDICTABLE;
+                        if firstcond == 0b1111 {
+                            return Err(DecodeError::Nonconforming);
+                        }
                     }
                     inst.operands = [
                         Operand::Imm32(firstcond),
-- 
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