From 047cd40313e39b662650bbf6c8059ab0910e5986 Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky
Date: Wed, 19 Feb 2014 15:47:59 +0200
Subject: Bytecode int varlen encoding: support arbitrary values for signed
 ints too.

---
 py/showbc.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

(limited to 'py/showbc.c')

diff --git a/py/showbc.c b/py/showbc.c
index e3387dbe2..837ee7611 100644
--- a/py/showbc.c
+++ b/py/showbc.c
@@ -57,11 +57,18 @@ void mp_byte_code_print(const byte *ip, int len) {
                 printf("LOAD_CONST_ELLIPSIS");
                 break;
 
-            case MP_BC_LOAD_CONST_SMALL_INT:
-                unum = (ip[0] | (ip[1] << 8) | (ip[2] << 16)) - 0x800000;
-                ip += 3;
-                printf("LOAD_CONST_SMALL_INT %d", (int)unum);
-                break;
+            case MP_BC_LOAD_CONST_SMALL_INT: {
+                int num = 0;
+                if ((ip[0] & 0x40) != 0) {
+                    // Number is negative
+                    num--;
+                }
+                do {
+                    num = (num << 7) | (*ip & 0x7f);
+                } while ((*ip++ & 0x80) != 0);
+                printf("LOAD_CONST_SMALL_INT %d", num);
+                break;
+            }
 
             case MP_BC_LOAD_CONST_INT:
                 DECODE_QSTR;
-- 
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