Compilation error

[Dave Dodge]

On Sun, Sep 09, 2007 at 09:39:28AM -0600, Greg Haerr wrote:
> :   ((type)x)++

> Will gcc 4.x optimize this out if the temp variable is auto?

Very likely, especially if the value is held in a register and the
bitwise representation before and after the cast is the same.  Note
that recent gcc uses a "static single assignment" technique, which as
a normal matter of operation creates unnamed temporary variables all
over the place.  My understanding is that if you give it code like
this:

  int a = 1;
  a = 99;
  a = 0;
  int b = a;

it effectively converts it into something like this:

  int const a___0 = 1;
  int const a___1 = 99;
  int const a___2 = 0;
  int const b___0 = a___2;

So don't be afraid of creating temp variables, especially with newer
versions of gcc.

                                                  -Dave Dodge