1 files changed, 34 insertions, 0 deletions
diff --git a/src/arch/isa_parser.py b/src/arch/isa_parser.py
index fb398d152..25908e986 100755
--- a/src/arch/isa_parser.py
+++ b/src/arch/isa_parser.py
@@ -1573,6 +1573,8 @@ def buildOperandNameMap(userDict, lineno):
     global operandsWithExtRE
     operandsWithExtRE = re.compile(operandsWithExtREString, re.MULTILINE)
 
+maxInstSrcRegs = 0
+maxInstDestRegs = 0
 
 class OperandList:
 
@@ -1636,6 +1638,12 @@ class OperandList:
                 if self.memOperand:
                     error(0, "Code block has more than one memory operand.")
                 self.memOperand = op_desc
+        global maxInstSrcRegs
+        global maxInstDestRegs
+        if maxInstSrcRegs < self.numSrcRegs:
+            maxInstSrcRegs = self.numSrcRegs
+        if maxInstDestRegs < self.numDestRegs:
+            maxInstDestRegs = self.numDestRegs
         # now make a final pass to finalize op_desc fields that may depend
         # on the register enumeration
         for op_desc in self.items:
@@ -1855,6 +1863,22 @@ namespace %(namespace)s {
 %(decode_function)s
 '''
 
+max_inst_regs_template = '''
+/*
+ * DO NOT EDIT THIS FILE!!!
+ *
+ * It was automatically generated from the ISA description in %(filename)s
+ */
+
+namespace %(namespace)s {
+
+    const int MaxInstSrcRegs = %(MaxInstSrcRegs)d;
+    const int MaxInstDestRegs = %(MaxInstDestRegs)d;
+
+} // namespace %(namespace)s
+
+'''
+
 
 # Update the output file only if the new contents are different from
 # the current contents.  Minimizes the files that need to be rebuilt
@@ -1954,6 +1978,16 @@ def parse_isa_desc(isa_desc_file, output_dir):
         update_if_needed(output_dir + '/' + cpu.filename,
                           file_template % vars())
 
+    # The variable names here are hacky, but this will creat local variables
+    # which will be referenced in vars() which have the value of the globals.
+    global maxInstSrcRegs
+    MaxInstSrcRegs = maxInstSrcRegs
+    global maxInstDestRegs
+    MaxInstDestRegs = maxInstDestRegs
+    # max_inst_regs.hh
+    update_if_needed(output_dir + '/max_inst_regs.hh', \
+            max_inst_regs_template % vars())
+
 # global list of CpuModel objects (see cpu_models.py)
 cpu_models = []