X86: Implement an integer media max microop.

diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa
index b3ff5cde2662a1283bd4e98e0ba703e40ddc62d2..08ba14b00879fc5e8f260c2784b67ce27c5e42ed 100644 (file)
--- a/src/arch/x86/isa/microops/mediaop.isa
+++ b/src/arch/x86/isa/microops/mediaop.isa
@@ -568,6 +568,44 @@ let {{
             FpDestReg.uqw = result;
         '''
 
+    class Mmaxi(MediaOp):
+        code = '''
+
+            assert(srcSize == destSize);
+            int size = srcSize;
+            int sizeBits = size * 8;
+            int items = (ext & 0x1) ? 1: (sizeof(FloatRegBits) / size);
+            uint64_t result = FpDestReg.uqw;
+
+            for (int i = 0; i < items; i++) {
+                int hiIndex = (i + 1) * sizeBits - 1;
+                int loIndex = (i + 0) * sizeBits;
+                uint64_t arg1Bits = bits(FpSrcReg1.uqw, hiIndex, loIndex);
+                int64_t arg1 = arg1Bits |
+                    (0 - (arg1Bits & (1 << (sizeBits - 1))));
+                uint64_t arg2Bits = bits(FpSrcReg2.uqw, hiIndex, loIndex);
+                int64_t arg2 = arg2Bits |
+                    (0 - (arg2Bits & (1 << (sizeBits - 1))));
+                uint64_t resBits;
+
+                if (ext & 0x2) {
+                    if (arg1 > arg2) {
+                        resBits = arg1Bits;
+                    } else {
+                        resBits = arg2Bits;
+                    }
+                } else {
+                    if (arg1Bits > arg2Bits) {
+                        resBits = arg1Bits;
+                    } else {
+                        resBits = arg2Bits;
+                    }
+                }
+                result = insertBits(result, hiIndex, loIndex, resBits);
+            }
+            FpDestReg.uqw = result;
+        '''
+
     class Msqrt(MediaOp):
         def __init__(self, dest, src, \
                 size = None, destSize = None, srcSize = None, ext = None):