[MCA] Don't assume that createMCInstrAnalysis() always returns a valid pointer.
Class InstrBuilder wrongly assumed that llvm targets were always able to return
a non-null pointer when createMCInstrAnalysis() was called on them.
This was causing crashes when simulating executions for targets that don't
provide an MCInstrAnalysis object.
This patch fixes the issue by making MCInstrAnalysis optional.
llvm-svn: 349352
diff --git a/llvm/tools/llvm-mca/llvm-mca.cpp b/llvm/tools/llvm-mca/llvm-mca.cpp
index 310b0bf..d0da3b8 100644
--- a/llvm/tools/llvm-mca/llvm-mca.cpp
+++ b/llvm/tools/llvm-mca/llvm-mca.cpp
@@ -378,7 +378,7 @@
Width = DispatchWidth;
// Create an instruction builder.
- mca::InstrBuilder IB(*STI, *MCII, *MRI, *MCIA);
+ mca::InstrBuilder IB(*STI, *MCII, *MRI, MCIA.get());
// Create a context to control ownership of the pipeline hardware.
mca::Context MCA(*MRI, *STI);