[llvm] r277434 - AArch64: Assert on branch displacement bits

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Tue Aug  2 03:56:52 2016
New Revision: 277434

URL: http://llvm.org/viewvc/llvm-project?rev=277434&view=rev
Log:
AArch64: Assert on branch displacement bits

Modified:
    llvm/trunk/lib/Target/AArch64/AArch64InstrInfo.cpp

Modified: llvm/trunk/lib/Target/AArch64/AArch64InstrInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64InstrInfo.cpp?rev=277434&r1=277433&r2=277434&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64InstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64InstrInfo.cpp Tue Aug  2 03:56:52 2016
@@ -132,6 +132,13 @@ static unsigned getBranchMaxDisplacement
 
   unsigned Bits = getBranchDisplacementBits(Opc);
   unsigned MaxOffs = ((1 << (Bits - 1)) - 1) << 2;
+
+  // Verify the displacement bits options have sane values.
+  // XXX: Is there a better place for this?
+  assert(MaxOffs >= 8 &&
+         "max branch displacement must be enough to jump"
+         "over conditional branch expansion");
+
   return MaxOffs;
 }