From 156f5bb56e2730013fcddf90e8cad0e5e3ee1928 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@gmail.com>
Date: Sun, 6 May 2012 18:44:02 +0000
Subject: [PATCH] Add shuffle decode support for VPERMQ/VPERMPD.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156265 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/InstPrinter/X86InstComments.cpp | 10 ++++++++++
 lib/Target/X86/Utils/X86ShuffleDecode.cpp      |  8 ++++++++
 lib/Target/X86/Utils/X86ShuffleDecode.h        |  4 ++++
 3 files changed, 22 insertions(+)

diff --git a/lib/Target/X86/InstPrinter/X86InstComments.cpp b/lib/Target/X86/InstPrinter/X86InstComments.cpp
index dbee88614d6..64ac5e685f7 100644
--- a/lib/Target/X86/InstPrinter/X86InstComments.cpp
+++ b/lib/Target/X86/InstPrinter/X86InstComments.cpp
@@ -507,6 +507,16 @@ void llvm::EmitAnyX86InstComments(const MCInst *MI, raw_ostream &OS,
     Src1Name = getRegName(MI->getOperand(1).getReg());
     DestName = getRegName(MI->getOperand(0).getReg());
     break;
+  case X86::VPERMQYri:
+  case X86::VPERMPDYri:
+    Src1Name = getRegName(MI->getOperand(1).getReg());
+    // FALL THROUGH.
+  case X86::VPERMQYmi:
+  case X86::VPERMPDYmi:
+    DecodeVPERMMask(MI->getOperand(MI->getNumOperands()-1).getImm(),
+                    ShuffleMask);
+    DestName = getRegName(MI->getOperand(0).getReg());
+    break;
   }
 
 
diff --git a/lib/Target/X86/Utils/X86ShuffleDecode.cpp b/lib/Target/X86/Utils/X86ShuffleDecode.cpp
index f0d9467f9b3..69d9439568c 100644
--- a/lib/Target/X86/Utils/X86ShuffleDecode.cpp
+++ b/lib/Target/X86/Utils/X86ShuffleDecode.cpp
@@ -192,4 +192,12 @@ void DecodeVPERM2X128Mask(EVT VT, unsigned Imm,
     ShuffleMask.push_back(i);
 }
 
+/// DecodeVPERMMask - this decodes the shuffle masks for VPERMQ/VPERMPD.
+/// No VT provided since it only works on 256-bit, 4 element vectors.
+void DecodeVPERMMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
+  for (unsigned i = 0; i != 4; ++i) {
+    ShuffleMask.push_back((Imm >> (2*i)) & 3);
+  }
+}
+
 } // llvm namespace
diff --git a/lib/Target/X86/Utils/X86ShuffleDecode.h b/lib/Target/X86/Utils/X86ShuffleDecode.h
index 14545e73022..a039b70918b 100644
--- a/lib/Target/X86/Utils/X86ShuffleDecode.h
+++ b/lib/Target/X86/Utils/X86ShuffleDecode.h
@@ -60,6 +60,10 @@ void DecodeUNPCKLMask(EVT VT, SmallVectorImpl<int> &ShuffleMask);
 void DecodeVPERM2X128Mask(EVT VT, unsigned Imm,
                           SmallVectorImpl<int> &ShuffleMask);
 
+/// DecodeVPERMMask - this decodes the shuffle masks for VPERMQ/VPERMPD.
+/// No VT provided since it only works on 256-bit, 4 element vectors.
+void DecodeVPERMMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
+
 } // llvm namespace
 
 #endif