On Monday, 12 January 2015 at 23:29:08 UTC, H. S. Teoh via
Digitalmars-d wrote:
On Mon, Jan 12, 2015 at 11:17:24PM +0000, deadalnix via
Digitalmars-d wrote:
On Monday, 12 January 2015 at 22:17:57 UTC, Walter Bright
wrote:
>Yes, it does. Returning an int in EAX now becomes returning a
>pair
>[EAX,EDX].
It is not that big of a deal, EDX is a trash register anyway
if memory
serve, but then, it become very bad when it do not fit in
register
anymore.
On the contrary, it's an extremely big deal. Registers are a
rare
resource, and allocating them for maximal usefulness is a major
issue in
code optimization.
These are trash register. Meaning the callee can put whatever in
them. The caller must consider them trashed after the call.
So no, it do NOT increase register pressure.
