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/* This file contains code shared by the compiler and the peephole
optimizer.
*/
#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 ? 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(_Py_CODEUNIT *codestr, unsigned char opcode,
unsigned int oparg, int ilen)
{
switch (ilen) {
case 4:
*codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 24) & 0xff);
/* fall through */
case 3:
*codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 16) & 0xff);
/* fall through */
case 2:
*codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 8) & 0xff);
/* fall through */
case 1:
*codestr++ = PACKOPARG(opcode, oparg & 0xff);
break;
default:
assert(0);
}
}