Fix disassembly of Thumb2 BFI instructions with bit range of [0, 32).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139964 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/Disassembler/ARMDisassembler.cpp b/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
index 2818e77..71cda57 100644
--- a/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
+++ b/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
@@ -1003,8 +1003,12 @@
// create the final mask.
unsigned msb = fieldFromInstruction32(Val, 5, 5);
unsigned lsb = fieldFromInstruction32(Val, 0, 5);
+
uint32_t msb_mask = (1 << (msb+1)) - 1;
+ if (msb == 31) msb_mask = 0xFFFFFFFF;
uint32_t lsb_mask = (1 << lsb) - 1;
+ if (lsb == 31) lsb_mask = 0xFFFFFFFF;
+
Inst.addOperand(MCOperand::CreateImm(~(msb_mask ^ lsb_mask)));
return MCDisassembler::Success;
}