From 2fdfdf47618ed421642a743b67d2616c7dae138e Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Sun, 11 Sep 2016 13:48:15 +0300
Subject: Issue #27129: Replaced wordcode related magic constants with macros.

---
 Python/wordcode_helpers.h | 35 +++++++++++++++++++----------------
 1 file changed, 19 insertions(+), 16 deletions(-)

(limited to 'Python/wordcode_helpers.h')

diff --git a/Python/wordcode_helpers.h b/Python/wordcode_helpers.h
index b61ba33d8f..b0e3a91776 100644
--- a/Python/wordcode_helpers.h
+++ b/Python/wordcode_helpers.h
@@ -2,35 +2,38 @@
    optimizer.
  */
 
-/* Minimum number of bytes necessary to encode instruction with EXTENDED_ARGs */
+#ifdef WORDS_BIGENDIAN
+#  define PACKOPARG(opcode, oparg) ((_Py_CODEUNIT)(((opcode) << 8) | (oparg)))
+#else
+#  define PACKOPARG(opcode, oparg) ((_Py_CODEUNIT)(((oparg) << 8) | (opcode)))
+#endif
+
+/* Minimum number of code units necessary to encode instruction with
+   EXTENDED_ARGs */
 static int
 instrsize(unsigned int oparg)
 {
-    return oparg <= 0xff ? 2 :
-        oparg <= 0xffff ? 4 :
-        oparg <= 0xffffff ? 6 :
-        8;
+    return oparg <= 0xff ? 1 :
+        oparg <= 0xffff ? 2 :
+        oparg <= 0xffffff ? 3 :
+        4;
 }
 
 /* Spits out op/oparg pair using ilen bytes. codestr should be pointed at the
    desired location of the first EXTENDED_ARG */
 static void
-write_op_arg(unsigned char *codestr, unsigned char opcode,
+write_op_arg(_Py_CODEUNIT *codestr, unsigned char opcode,
     unsigned int oparg, int ilen)
 {
     switch (ilen) {
-        case 8:
-            *codestr++ = EXTENDED_ARG;
-            *codestr++ = (oparg >> 24) & 0xff;
-        case 6:
-            *codestr++ = EXTENDED_ARG;
-            *codestr++ = (oparg >> 16) & 0xff;
         case 4:
-            *codestr++ = EXTENDED_ARG;
-            *codestr++ = (oparg >> 8) & 0xff;
+            *codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 24) & 0xff);
+        case 3:
+            *codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 16) & 0xff);
         case 2:
-            *codestr++ = opcode;
-            *codestr++ = oparg & 0xff;
+            *codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 8) & 0xff);
+        case 1:
+            *codestr++ = PACKOPARG(opcode, oparg & 0xff);
             break;
         default:
             assert(0);
-- 
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