From 0f4ae756c1af09883d930c04368f9e1c3aa1de6d Mon Sep 17 00:00:00 2001
From: Benjamin Barenblat <bbaren@google.com>
Date: Fri, 26 Feb 2016 13:22:22 -0500
Subject: Go: Print CSRs as signed values

---
 parse-opcodes | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/parse-opcodes b/parse-opcodes
index a6e0c87..0f7d449 100755
--- a/parse-opcodes
+++ b/parse-opcodes
@@ -767,6 +767,12 @@ def make_chisel():
   print '  }'
   print '}'
 
+def signed(value, width):
+  if 0 <= value < (1<<(width-1)):
+    return value
+  else:
+    return value - (1<<width)
+
 def print_go_insn(name):
   print '\tcase A%s:' % name.upper().replace('.', '')
   m = match[name]
@@ -774,7 +780,7 @@ def print_go_insn(name):
   funct3 = yank(m, 12, 3)
   csr = yank(m, 20, 12)
   funct7 = yank(m, 25, 7)
-  print '\t\treturn &inst{0x%x, 0x%x, 0x%x, 0x%x}' % (opcode, funct3, csr, funct7)
+  print '\t\treturn &inst{0x%x, 0x%x, %d, 0x%x}' % (opcode, funct3, signed(csr, 12), funct7)
 
 def make_go():
   print '// Automatically generated by parse-opcodes'
@@ -786,7 +792,7 @@ def make_go():
   print 'type inst struct {'
   print '\topcode uint32'
   print '\tfunct3 uint32'
-  print '\tcsr uint32'
+  print '\tcsr int64'
   print '\tfunct7 uint32'
   print '}'
   print
-- 
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