X86: Make signed versions of partial register values available to microops.

--HG--
extra : convert_revision : c820d1250f505911a341ced42d4f73796ea77f87

src/arch/x86/insts/static_inst.hh

@@ -140,6 +140,27 @@ namespace X86ISA
                 panic("Tried to pick with unrecognized size %d.\n", size);
             }
         }
+
+        inline int64_t signedPick(uint64_t from, int idx, int size) const
+        {
+            X86IntReg reg = from;
+            DPRINTF(X86, "Picking with size %d\n", size);
+            if(_srcRegIdx[idx] & (1 << 6))
+                return reg.SH;
+            switch(size)
+            {
+              case 1:
+                return reg.SL;
+              case 2:
+                return reg.SX;
+              case 4:
+                return reg.SE;
+              case 8:
+                return reg.SR;
+              default:
+                panic("Tried to pick with unrecognized size %d.\n", size);
+            }
+        }
     };
 }
 

src/arch/x86/intregs.hh

@@ -64,10 +64,15 @@ namespace X86ISA
 {
     BitUnion64(X86IntReg)
         Bitfield<63,0> R;
+        SignedBitfield<63,0> SR;
         Bitfield<31,0> E;
+        SignedBitfield<31,0> SE;
         Bitfield<15,0> X;
+        SignedBitfield<15,0> SX;
         Bitfield<15,8> H;
+        SignedBitfield<15,8> SH;
         Bitfield<7, 0> L;
+        SignedBitfield<7, 0> SL;
     EndBitUnion(X86IntReg)
 
     enum IntRegIndex

src/arch/x86/isa/microops/regop.isa

@@ -283,10 +283,17 @@ let {{
             # compute it.
             matcher = re.compile("(?<!\w)psrc1(?!\w)")
             if matcher.search(allCode):
-                code = "IntReg psrc1 = pick(SrcReg1, 0, dataSize);" + code
+                code = "uint64_t psrc1 = pick(SrcReg1, 0, dataSize);" + code
             matcher = re.compile("(?<!\w)psrc2(?!\w)")
             if matcher.search(allCode):
-                code = "IntReg psrc2 = pick(SrcReg2, 1, dataSize);" + code
+                code = "uint64_t psrc2 = pick(SrcReg2, 1, dataSize);" + code
+            # Also make available versions which do sign extension
+            matcher = re.compile("(?<!\w)spsrc1(?!\w)")
+            if matcher.search(allCode):
+                code = "int64_t spsrc1 = signedPick(SrcReg1, 0, dataSize);" + code
+            matcher = re.compile("(?<!\w)spsrc2(?!\w)")
+            if matcher.search(allCode):
+                code = "int64_t spsrc2 = signedPick(SrcReg2, 1, dataSize);" + code
 
             base = "X86ISA::RegOp"
 
@@ -671,7 +678,7 @@ let {{
 
     #FIXME This needs to always use 32 bits unless REX.W is present
     class cvtf_i2d(ConvOp):
-        code = 'FpDestReg = psrc1;'
+        code = 'FpDestReg = spsrc1;'
 
     class cvtf_i2d_hi(ConvOp):
         code = 'FpDestReg = bits(SrcReg1, 63, 32);'