Fix decoding of Thumb2 prefetch instructions, which account for all the remaining Thumb2 decoding failures found by randomized testing so far.

llvm-svn: 138341

1 files changed, 9 insertions, 3 deletions

diff --git a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
index 5711b69796e..c4b2f613cc7 100644
--- a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
+++ b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
@@ -2392,9 +2392,15 @@ static DecodeStatus DecodeT2LoadShift(llvm::MCInst &Inst, unsigned Insn,
                               uint64_t Address, const void *Decoder) {
   DecodeStatus S = Success;
 
-  if (Inst.getOpcode() != ARM::t2PLDs) {
-    unsigned Rt = fieldFromInstruction32(Insn, 12, 4);
-    CHECK(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder));
+  switch (Inst.getOpcode()) {
+    case ARM::t2PLDs:
+    case ARM::t2PLDWs:
+    case ARM::t2PLIs:
+      break;
+    default: {
+      unsigned Rt = fieldFromInstruction32(Insn, 12, 4);
+      CHECK(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder));
+    }
   }
 
   unsigned Rn = fieldFromInstruction32(Insn, 16, 4);