On 5/21/07, Tehila Meyzels <[EMAIL PROTECTED]> wrote:
Hi,
I'd like to get an explanation why ifcvt.c checks whether 1 of the 2
successors of the IF-header block has a stmt that exits from the loop?
Why does it prevent the if-conversion?
I'm referring to the following code:
/* Nor exit the loop. */
if ((then_edge->flags & EDGE_LOOP_EXIT)
|| (else_edge->flags & EDGE_LOOP_EXIT))
return NULL;
To prevent ifcvt from moving computations into loops. See this patch:
http://gcc.gnu.org/ml/gcc-patches/2003-07/msg01864.html
Gr.
Steven
