From 4897e263906aa3c88e0a135f18ea9bd2af2676e5 Mon Sep 17 00:00:00 2001
From: Quentin Colombet <qcolombet@apple.com>
Date: Wed, 2 Oct 2013 23:11:47 +0000
Subject: [PATCH] [llvm-c][Disassembler] When printing latency information,
 skip scheduling classes that are marked as Variant as those require an MI to
 pass to SubTargetInfo::resolveSchedClass.

This is part of <rdar://problem/14687488>.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191864 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/MC/MCDisassembler/Disassembler.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/MC/MCDisassembler/Disassembler.cpp b/lib/MC/MCDisassembler/Disassembler.cpp
index 406ee5b7db9..115af8d45b7 100644
--- a/lib/MC/MCDisassembler/Disassembler.cpp
+++ b/lib/MC/MCDisassembler/Disassembler.cpp
@@ -191,7 +191,9 @@ static int getLatency(LLVMDisasmContext *DC, const MCInst &Inst) {
   const MCInstrDesc& Desc = DC->getInstrInfo()->get(Inst.getOpcode());
   unsigned SCClass = Desc.getSchedClass();
   const MCSchedClassDesc *SCDesc = SCModel->getSchedClassDesc(SCClass);
-  if (!SCDesc || !SCDesc->isValid())
+  // Resolving the variant SchedClass requires an MI to pass to
+  // SubTargetInfo::resolveSchedClass.
+  if (!SCDesc || !SCDesc->isValid() || SCDesc->isVariant())
     return NoInformationAvailable;
 
   // Compute output latency.