Make "mov" work for all Thumb2 MOV encodings

According to the ARM specification, "mov" is a valid mnemonic for all Thumb2 MOV encodings.
To achieve this, the patch adds one instruction alias with a special range condition to avoid collision with the Thumb1 MOV.

llvm-svn: 188901

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index df9306a9b99..7467071db32 100644
--- a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -867,6 +867,15 @@ public:
     int64_t Value = CE->getValue();
     return Value >= 0 && Value < 65536;
   }
+  bool isImm256_65535Expr() const {
+    if (!isImm()) return false;
+    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
+    // If it's not a constant expression, it'll generate a fixup and be
+    // handled later.
+    if (!CE) return true;
+    int64_t Value = CE->getValue();
+    return Value >= 256 && Value < 65536;
+  }
   bool isImm0_65535Expr() const {
     if (!isImm()) return false;
     const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());