From 82e1bba0e4afaf3769fc46819c1601e387ffb56e Mon Sep 17 00:00:00 2001
From: Silviu Baranga <silviu.baranga@arm.com>
Date: Thu, 5 Apr 2012 16:13:15 +0000
Subject: [PATCH] Added support for handling unpredictable arithmetic
 instructions on ARM.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154100 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrInfo.td                       |  2 ++
 test/MC/Disassembler/ARM/invalid-LDRT-arm.txt        | 12 ------------
 .../Disassembler/ARM/unpredictable-SHADD16-arm.txt   |  7 +++++++
 3 files changed, 9 insertions(+), 12 deletions(-)
 delete mode 100644 test/MC/Disassembler/ARM/invalid-LDRT-arm.txt
 create mode 100644 test/MC/Disassembler/ARM/unpredictable-SHADD16-arm.txt

diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index 37d53b09a79..eb30f79eff8 100644
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -3244,6 +3244,8 @@ class AAI<bits<8> op27_20, bits<8> op11_4, string opc,
   let Inst{19-16} = Rn;
   let Inst{15-12} = Rd;
   let Inst{3-0}   = Rm;
+  
+  let Unpredictable{11-8} = 0b1111;
 }
 
 // Saturating add/subtract
diff --git a/test/MC/Disassembler/ARM/invalid-LDRT-arm.txt b/test/MC/Disassembler/ARM/invalid-LDRT-arm.txt
deleted file mode 100644
index 067dcb36a7e..00000000000
--- a/test/MC/Disassembler/ARM/invalid-LDRT-arm.txt
+++ /dev/null
@@ -1,12 +0,0 @@
-# RUN: llvm-mc --disassemble %s -triple=arm-apple-darwin9 |& grep {invalid instruction encoding}
-
-# Opcode=0 Name=PHI Format=(42)
-#  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
-# -------------------------------------------------------------------------------------------------
-# | 1: 1: 1: 0| 0: 1: 1: 0| 0: 0: 1: 1| 0: 1: 1: 1| 0: 1: 0: 1| 0: 0: 0: 1| 0: 0: 0: 1| 0: 0: 0: 0|
-# -------------------------------------------------------------------------------------------------
-#
-# The bytes have Inst{4} = 1, so it's not an LDRT Encoding A2 instruction.
-0x10 0x51 0x37 0xe6
-
-
diff --git a/test/MC/Disassembler/ARM/unpredictable-SHADD16-arm.txt b/test/MC/Disassembler/ARM/unpredictable-SHADD16-arm.txt
new file mode 100644
index 00000000000..8ec49cad349
--- /dev/null
+++ b/test/MC/Disassembler/ARM/unpredictable-SHADD16-arm.txt
@@ -0,0 +1,7 @@
+# RUN: llvm-mc --disassemble %s -triple=arm-apple-darwin9 |& FileCheck %s
+
+# CHECK: warning: potentially undefined
+# CHECK: shadd16	r5, r7, r0
+0x10 0x51 0x37 0xe6
+
+