From 43e43f7d8bfc748973feb781fc304f8d23ab88ba Mon Sep 17 00:00:00 2001
From: Akira Hatanaka <ahatanaka@mips.com>
Date: Mon, 3 Oct 2011 21:23:18 +0000
Subject: [PATCH] Add support for 64-bit logical NOR.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141029 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Mips/Mips64InstrInfo.td | 7 +++++++
 test/CodeGen/Mips/mips64instrs.ll  | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/lib/Target/Mips/Mips64InstrInfo.td b/lib/Target/Mips/Mips64InstrInfo.td
index 3f52e9ebfd3..cd185f6a3c5 100644
--- a/lib/Target/Mips/Mips64InstrInfo.td
+++ b/lib/Target/Mips/Mips64InstrInfo.td
@@ -72,6 +72,12 @@ class LogicI64<bits<6> op, string instr_asm, SDNode OpNode>:
      !strconcat(instr_asm, "\t$dst, $b, $c"),
      [(set CPU64Regs:$dst, (OpNode CPU64Regs:$b, immZExt16:$c))], IIAlu>;
 
+let isCommutable = 1 in
+class LogicNOR64<bits<6> op, bits<6> func, string instr_asm>:
+  FR<op, func, (outs CPU64Regs:$dst), (ins CPU64Regs:$b, CPU64Regs:$c),
+     !strconcat(instr_asm, "\t$dst, $b, $c"),
+     [(set CPU64Regs:$dst, (not (or CPU64Regs:$b, CPU64Regs:$c)))], IIAlu>;
+
 // Shifts
 class LogicR_shift_rotate_imm64<bits<6> func, bits<5> _rs, string instr_asm,
                                 SDNode OpNode, PatFrag PF>:
@@ -141,6 +147,7 @@ def DSUBu    : ArithR64<0x00, 0x2f, "dsubu", sub, IIAlu>;
 def DAND     : LogicR64<0x24, "and", and>;
 def DOR      : LogicR64<0x25, "or", or>;
 def DXOR     : LogicR64<0x26, "xor", xor>;
+def DNOR     : LogicNOR64<0x00, 0x27, "nor">;
 
 /// Shift Instructions
 def DSLL     : LogicR_shift_rotate_imm64<0x38, 0x00, "dsll", shl, immZExt5>;
diff --git a/test/CodeGen/Mips/mips64instrs.ll b/test/CodeGen/Mips/mips64instrs.ll
index 16bca0fbbf7..8c02a2dcbb8 100644
--- a/test/CodeGen/Mips/mips64instrs.ll
+++ b/test/CodeGen/Mips/mips64instrs.ll
@@ -133,3 +133,11 @@ entry:
   ret i64 %tmp1
 }
 
+define i64 @f20(i64 %a, i64 %b) nounwind readnone {
+entry:
+; CHECK: nor
+  %or = or i64 %b, %a
+  %neg = xor i64 %or, -1
+  ret i64 %neg
+}
+