#238 Implementation of feature request 395

[Ben Shi]

In c code

extern unsigned int ww();
extern unsigned int yy;
unsigned int ss(unsigned char a, unsigned char b)
{
return (ww() << a) + (yy << b);
}
unsigned int ssss(unsigned char a, unsigned char b)
{
return (ww() >> a) + (yy >> b);
}

the "ww() >> a" and "ww() >> a" parts are operated on stack as two 8-bit operands, while there are free 16-bit registers.

After applying this patch, they are operated in a free register as one entire 16-bit operand.

[Ben Shi]

This patch is against r8982.

[Philipp Klaus Krause]

Since we already had a quite sophisticated mechanism for the choice of the shift location (in the functions for the shifts by literal values), I refactored that one, and as of revision #9000, use it for all shifts.

Philipp