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Re: Simple returns are broken in gcc 3.X
On Tue, Jul 31, 2001 at 07:06:25PM -0400, John David Anglin wrote:
> In looking at thread_prologue_and_epilogue_insns, I am having
> difficulty understanding how "returns" are generated when an exit
> block has no non-fake predecessors or no fall-thru predecessor.
They aren't generated in this case because that means that the
function doesn't return (normally) at all. Perhaps that bit is
deserving of a comment...
There are two other kinds of edges that can come to EXIT_BLOCK:
(1) If EDGE_ABNORMAL_CALL, then we exit the function by a sibling call.
(2) If !EDGE_FALLTHRU, then we exit via a return insn. Given that
we're removing HAVE_return generation from early in the compiler,
this should no longer happen at this point.
r~