From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Tue, 2 Aug 2016 08:56:52 +0000 (+0000)
Subject: AArch64: Assert on branch displacement bits
X-Git-Tag: llvmorg-4.0.0-rc1~13590
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6f1ae3c7db43a312d638cbcde2b431026d211d8d;p=platform%2Fupstream%2Fllvm.git

AArch64: Assert on branch displacement bits

llvm-svn: 277434
---

diff --git a/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp b/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
index 05bc1cb..d359953 100644
--- a/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
@@ -132,6 +132,13 @@ static unsigned getBranchMaxDisplacementBytes(unsigned Opc) {
 
   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;
 }