[compiler-rt] [win/asan] GetInstructionSize: Fix `41 81 7c ...` to return 9. (PR #117828)

[via llvm-commits]

https://github.com/bernhardu updated https://github.com/llvm/llvm-project/pull/117828

>From 25fd2cda35d46756cd22804f3b8ff3395eb16821 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bernhard=20=C3=9Cbelacker?= <bernhardu at mailbox.org>
Date: Wed, 27 Nov 2024 01:19:38 +0100
Subject: [PATCH] [win/asan] GetInstructionSize: Fix `41 81 7c ...` to return
 9.

---
 compiler-rt/lib/interception/interception_win.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/compiler-rt/lib/interception/interception_win.cpp b/compiler-rt/lib/interception/interception_win.cpp
index 93886e79fd88c8..cfa38fe702ebcd 100644
--- a/compiler-rt/lib/interception/interception_win.cpp
+++ b/compiler-rt/lib/interception/interception_win.cpp
@@ -808,7 +808,6 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
     case 0x798141:  // 41 81 79 XX YY YY YY YY : cmp DWORD PTR [r9+YY], XX XX XX XX
     case 0x7a8141:  // 41 81 7a XX YY YY YY YY : cmp DWORD PTR [r10+YY], XX XX XX XX
     case 0x7b8141:  // 41 81 7b XX YY YY YY YY : cmp DWORD PTR [r11+YY], XX XX XX XX
-    case 0x7c8141:  // 41 81 7c XX YY YY YY YY : cmp DWORD PTR [r12+YY], XX XX XX XX
     case 0x7d8141:  // 41 81 7d XX YY YY YY YY : cmp DWORD PTR [r13+YY], XX XX XX XX
     case 0x7e8141:  // 41 81 7e XX YY YY YY YY : cmp DWORD PTR [r14+YY], XX XX XX XX
     case 0x7f8141:  // 41 81 7f YY XX XX XX XX : cmp DWORD PTR [r15+YY], XX XX XX XX
@@ -835,6 +834,10 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
     case 0x2444c7:    // C7 44 24 XX YY YY YY YY
                       //   mov dword ptr [rsp + XX], YYYYYYYY
       return 8;
+
+    case 0x7c8141:  // 41 81 7c ZZ YY XX XX XX XX
+                    // cmp DWORD PTR [reg+reg*n+YY], XX XX XX XX
+      return 9;
   }
 
   switch (*(u32*)(address)) {