[PATCH] Emit a trap instruction for IR 'unreachable'

[Yaron Keren]

  Ok, not sure why the TargetOptions.h patch didn't go in, but here it is.

Hi martell, vadimcn, Kai, nrieck, rnk, dblaikie, theraven,

http://reviews.llvm.org/D3417

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3417?vs=8626&id=8632#toc

Files:
  include/llvm/Target/TargetOptions.h

Index: include/llvm/Target/TargetOptions.h
===================================================================
--- include/llvm/Target/TargetOptions.h
+++ include/llvm/Target/TargetOptions.h
@@ -51,6 +51,7 @@
           EnableFastISel(false), PositionIndependentExecutable(false),
           UseInitArray(false),
           DisableIntegratedAS(false), CompressDebugSections(false),
+          TrapUnreachable(false),
           TrapFuncName(""), FloatABIType(FloatABI::Default),
           AllowFPOpFusion(FPOpFusion::Standard) {}
 
@@ -162,6 +163,9 @@
     /// Compress DWARF debug sections.
     unsigned CompressDebugSections : 1;
 
+    /// Emit target-specific trap instruction for 'unreachable' IR instructions.
+    unsigned TrapUnreachable : 1;
+
     /// getTrapFunctionName - If this returns a non-empty string, this means
     /// isel should lower Intrinsic::trap to a call to the specified function
     /// name instead of an ISD::TRAP node.
@@ -216,6 +220,7 @@
     ARE_EQUAL(EnableFastISel) &&
     ARE_EQUAL(PositionIndependentExecutable) &&
     ARE_EQUAL(UseInitArray) &&
+    ARE_EQUAL(TrapUnreachable) &&
     ARE_EQUAL(TrapFuncName) &&
     ARE_EQUAL(FloatABIType) &&
     ARE_EQUAL(AllowFPOpFusion);
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