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Re: LOOP_EXPR
On Dec 28, 2004, at 8:29 AM, Daniel Berlin wrote:
On Tue, 2004-12-28 at 21:42 +0530, Virender Kashyap wrote:
Hi,
I am working on a a particular optimization in GCC and intend to
use
GIMPLE for this. I have some doubt about the LOOP_EXPR as given in
grammar
of GIMPLE. The documentation mentions a separare expresssion called
LOOP_EXPR to denote loops( as infinite while loops).
The docs i have say
"
@node Loops
@subsubsection Loops
@cindex Loops
At one time loops were expressed in GIMPLE using @code{LOOP_EXPR}, but
now they are lowered to explicit gotos.
"
I see following in c-tree.texi.
@item LOOP_EXPR
These nodes represent ``infinite'' loops. The @code{LOOP_EXPR_BODY}
represents the body of the loop. It should be executed forever, unless
an @code{EXIT_EXPR} is encountered.
@item EXIT_EXPR
These nodes represent conditional exits from the nearest enclosing
@code{LOOP_EXPR}. The single operand is the condition; if it is
nonzero, then the loop should be exited. An @code{EXIT_EXPR} will only
appear within a @code{LOOP_EXPR}.
-
Devang