AMDGPU: Move disassembler support check to constructor

Don't check for unsupported targets for every instruction.

llvm-svn: 361406

1 files changed, 6 insertions, 5 deletions

diff --git a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
index 7db736766d2..b77deeab960 100644
--- a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
+++ b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
@@ -61,7 +61,12 @@ AMDGPUDisassembler::AMDGPUDisassembler(const MCSubtargetInfo &STI,
                                        MCContext &Ctx,
                                        MCInstrInfo const *MCII) :
   MCDisassembler(STI, Ctx), MCII(MCII), MRI(*Ctx.getRegisterInfo()),
-  TargetMaxInstBytes(Ctx.getAsmInfo()->getMaxInstLength(&STI)) {}
+  TargetMaxInstBytes(Ctx.getAsmInfo()->getMaxInstLength(&STI)) {
+
+  // ToDo: AMDGPUDisassembler supports only VI ISA.
+  if (!STI.getFeatureBits()[AMDGPU::FeatureGCN3Encoding] && !isGFX10())
+    report_fatal_error("Disassembly not yet supported for subtarget");
+}
 
 inline static MCDisassembler::DecodeStatus
 addOperand(MCInst &Inst, const MCOperand& Opnd) {
@@ -189,10 +194,6 @@ DecodeStatus AMDGPUDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
   CommentStream = &CS;
   bool IsSDWA = false;
 
-  // ToDo: AMDGPUDisassembler supports only VI ISA.
-  if (!STI.getFeatureBits()[AMDGPU::FeatureGCN3Encoding] && !isGFX10())
-    report_fatal_error("Disassembly not yet supported for subtarget");
-
   unsigned MaxInstBytesNum = std::min((size_t)TargetMaxInstBytes, Bytes_.size());
   Bytes = Bytes_.slice(0, MaxInstBytesNum);