[ARM] Handle +t2dsp feature as an ArchExtKind in ARMTargetParser.def

Currently, the availability of DSP instructions (ACLE 6.4.7) is handled in a
hand-rolled tricky condition block in tools/clang/lib/Basic/Targets.cpp, with
a FIXME: attached.

This patch changes the handling of +t2dsp to be in line with other
architecture extensions.

Following a revert of r248152 and new review comments, this patch also includes
renaming FeatureDSPThumb2 -> FeatureDSP, hasThumb2DSP() -> hasDSP(), etc.
The spelling of "t2dsp" is preserved, pending a further investigation of its
possible external usage.

Differential Revision: http://reviews.llvm.org/D12937

llvm-svn: 248519

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
index 3799074..38cb585ed 100644
--- a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
+++ b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
@@ -4111,7 +4111,7 @@ static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Val,
         // indicates the move for the GE{3:0} bits, the mask{0} bit can be set
         // only if the processor includes the DSP extension.
         if (Mask == 0 || (Mask != 2 && ValLow > 3) ||
-            (!(FeatureBits[ARM::FeatureDSPThumb2]) && (Mask & 1)))
+            (!(FeatureBits[ARM::FeatureDSP]) && (Mask & 1)))
           S = MCDisassembler::SoftFail;
       }
     }