From d26bad079d6977309699e0bc9203451904acbd86 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Thu, 19 Jan 2012 01:50:30 +0000
Subject: [PATCH] Add comment and fix range check in condition.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148455 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp b/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
index adedc208d0e..2a8f7c6dc4e 100644
--- a/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
+++ b/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
@@ -180,8 +180,10 @@ bool ARMAsmBackend::fixupNeedsRelaxation(const MCFixup &Fixup,
     return Offset > 254 || Offset < -256;
   }
   case ARM::fixup_arm_thumb_cp: {
+    // If the immediate is negative, greater than 1020, or not a multiple
+    // of four, the wide version of the instruction must be used.
     int64_t Offset = int64_t(Value) - 4;
-    return Offset > 4095 || Offset < 0;
+    return Offset > 1020 || Offset < 0 || Offset & 3;
   }
   }
   llvm_unreachable("Invalid switch/cash!?");