X86: Make a microcode branch microop.

Also some touch up for ruflag.

--HG--
extra : convert_revision : 829947169af25ca6573f53b9430707101c75cc23

src/arch/isa_parser.py

@@ -1464,6 +1464,25 @@ class MemOperand(Operand):
     def makeAccSize(self):
         return self.size
 
+class UPCOperand(Operand):
+    def makeConstructor(self):
+        return ''
+
+    def makeRead(self):
+        return '%s = xc->readMicroPC();\n' % self.base_name
+
+    def makeWrite(self):
+        return 'xc->setMicroPC(%s);\n' % self.base_name
+
+class NUPCOperand(Operand):
+    def makeConstructor(self):
+        return ''
+
+    def makeRead(self):
+        return '%s = xc->readNextMicroPC();\n' % self.base_name
+
+    def makeWrite(self):
+        return 'xc->setNextMicroPC(%s);\n' % self.base_name
 
 class NPCOperand(Operand):
     def makeConstructor(self):

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

@@ -453,7 +453,7 @@ let {{
 
         setUpMicroRegOp(name, Name, "X86ISA::RegOp", code);
 
-    def defineMicroRegOpImm(mnemonic, code):
+    def defineMicroRegOpImm(mnemonic, code, flagCode=""):
         Name = mnemonic
         name = mnemonic.lower()
         code = immPick + code
@@ -615,11 +615,12 @@ let {{
             ''')
 
     defineMicroRegOpWr('Wrip', 'RIP = psrc1 + op2', elseCode="RIP = RIP;")
+    defineMicroRegOpWr('Br', 'nuIP = psrc1 + op2;', elseCode='nuIP = nuIP;')
     defineMicroRegOpWr('Wruflags', 'ccFlagBits = psrc1 ^ op2')
 
     defineMicroRegOpRd('Rdip', 'DestReg = RIP')
     defineMicroRegOpRd('Ruflags', 'DestReg = ccFlagBits')
-    defineMicroRegOpImm('Ruflag', 'DestReg = bits(ccFlagBits, imm8);', \
+    defineMicroRegOpImm('Ruflag', 'DestReg = bits(ccFlagBits, imm8 + 0*psrc1);', \
             flagCode = genCCFlagBitsLogic)
 
     defineMicroRegOpImm('Sext', '''

src/arch/x86/isa/operands.isa

@@ -104,7 +104,9 @@ def operands {{
         'Data':          ('IntReg', 'uqw', '(((data & 0x1C) == 4 ? foldOBit : 0) | data)', 'IsInteger', 6),
         'rax':           ('IntReg', 'uqw', '(INTREG_RAX)', 'IsInteger', 7),
         'RIP':           ('NPC', 'uqw', None, (None, None, 'IsControl'), 10),
-        'ccFlagBits':       ('IntReg', 'uqw', 'NUM_INTREGS + NumMicroIntRegs', None, 20),
+        'uIP':           ('UPC', 'uqw', None, (None, None, 'IsControl'), 11),
+        'nuIP':          ('NUPC', 'uqw', None, (None, None, 'IsControl'), 12),
+        'ccFlagBits':    ('IntReg', 'uqw', 'NUM_INTREGS + NumMicroIntRegs', None, 20),
         'SegBase':       ('ControlReg', 'uqw', 'MISCREG_SEG_BASE_BASE + segment', (None, None, ['IsSerializeAfter','IsSerializing','IsNonSpeculative']), 50),
         'Mem':           ('Mem', 'uqw', None, ('IsMemRef', 'IsLoad', 'IsStore'), 100)
 }};

src/cpu/simple/base.hh

@@ -291,11 +291,15 @@ class BaseSimpleCPU : public BaseCPU
     }
 
     uint64_t readPC() { return thread->readPC(); }
+    uint64_t readMicroPC() { return thread->readMicroPC(); }
     uint64_t readNextPC() { return thread->readNextPC(); }
+    uint64_t readNextMicroPC() { return thread->readNextMicroPC(); }
     uint64_t readNextNPC() { return thread->readNextNPC(); }
 
     void setPC(uint64_t val) { thread->setPC(val); }
+    void setMicroPC(uint64_t val) { thread->setMicroPC(val); }
     void setNextPC(uint64_t val) { thread->setNextPC(val); }
+    void setNextMicroPC(uint64_t val) { thread->setNextMicroPC(val); }
     void setNextNPC(uint64_t val) { thread->setNextNPC(val); }
 
     MiscReg readMiscRegNoEffect(int misc_reg)