From 1fed0161d94dc0bd89e1c682f1f5d8757bd252a2 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Mon, 17 Aug 2009 20:25:13 -0700
Subject: [PATCH] X86: Implement a shuffle media microop.

---
 src/arch/x86/isa/microops/mediaop.isa | 42 +++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa
index 83962b0f2..1bd99db3a 100644
--- a/src/arch/x86/isa/microops/mediaop.isa
+++ b/src/arch/x86/isa/microops/mediaop.isa
@@ -365,6 +365,48 @@ let {{
             FpDestReg.uqw = result;
         '''
 
+    class shuffle(MediaOp):
+        code = '''
+            assert(srcSize == destSize);
+            int size = srcSize;
+            int sizeBits = size * 8;
+            int items = sizeof(FloatRegBits) / size;
+            int options;
+            int optionBits;
+            if (size == 8) {
+                options = 2;
+                optionBits = 1;
+            } else {
+                options = 4;
+                optionBits = 2;
+            }
+
+            uint64_t result = 0;
+            uint8_t sel = ext;
+
+            for (int i = 0; i < items; i++) {
+                uint64_t resBits;
+                uint8_t lsel = sel & mask(optionBits);
+                if (lsel * size >= sizeof(FloatRegBits)) {
+                    lsel -= options / 2;
+                    resBits = bits(FpSrcReg2.uqw,
+                            (lsel + 1) * sizeBits - 1,
+                            (lsel + 0) * sizeBits);
+                }  else {
+                    resBits = bits(FpSrcReg1.uqw,
+                            (lsel + 1) * sizeBits - 1,
+                            (lsel + 0) * sizeBits);
+                }
+
+                sel >>= optionBits;
+
+                int hiIndex = (i + 1) * sizeBits - 1;
+                int loIndex = (i + 0) * sizeBits;
+                result = insertBits(result, hiIndex, loIndex, resBits);
+            }
+            FpDestReg.uqw = result;
+        '''
+
     class Unpack(MediaOp):
         code = '''
             assert(srcSize == destSize);