Fix PR10755 by checking for invalid predicate codes from UNPREDICTABLE t2IT instructi...

This is the last disassembly crash detected by exhaustive Thumb2 instruction space.  Major thanks to Chandler Carruth for making this kind of exhaustive testing possible.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138625 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/Disassembler/ARMDisassembler.cpp b/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
index 0d945fdf59195f12d9f7d45c06e439aeaf6d5de2..f1c5ce8bc52ed0c96b7d313dd1860e7348b47d6a 100644 (file)
--- a/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
+++ b/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
@@ -376,6 +376,8 @@ void ThumbDisassembler::AddThumbPredicate(MCInst &MI) const {
   unsigned CC;
   if (!ITBlock.empty()) {
     CC = ITBlock.back();
+    if (CC == 0xF)
+      CC = ARMCC::AL;
     ITBlock.pop_back();
   } else
     CC = ARMCC::AL;