This is the mail archive of the
mailing list for the GCC project.
Re: PTR-PLUS merge into the mainline
On Thu, 5 Jul 2007, I wrote:
> Exactly and that's why I think this transformation is done far too early.
> It doesn't make sense that these two examples produce different code:
> int foo1(int x)
> return (x * 4) + 4;
> int foo2(int x)
> int y = x * 4;
> return y + 4;
int foo3(int x, int y)
return (x * y) + (y * 5);
int foo4(int x, int y)
x *= y;
return x + (y * 5);
Here the generated code depends on how the constant multiply is expanded,
so that combine can do the optimization.