[PATCH] Fix PRs 19431 and 21463 (if conversion with loads)

[Richard Guenther]

On Tue, 17 Apr 2007, Diego Novillo wrote:

> Richard Guenther wrote on 02/15/07 05:14:
> 
> > 	PR tree-optimization/19431
> > 	PR tree-optimization/21463
> > 	* tree-pass.h (pass_phiprop): Declare.
> > 	* passes.c (init_optimization_passes): New phiprop pass.
> > 	* tree-ssa-forwprop.c (struct phiprop_d): New structure.
> > 	(phivn_valid_p): New helper function.
> > 	(phiprop_insert_phi): Likewise.
> > 	(propagate_with_phi): Likewise.
> > 	(tree_ssa_phiprop): New propagator propagating loads
> > 	through phi nodes if profitable.
> > 	(tree_ssa_forward_propagate_single_use_va): Call it.
> > 
> > 	* gcc.c-torture/execute/20070212-1.c: New testcase.
> > 	* gcc.c-torture/execute/20070212-2.c: Likewise.
> > 	* gcc.c-torture/execute/20070212-3.c: Likewise.
> > 	* gcc.dg/tree-ssa/pr21463.c: Likewise.
> > 	* g++.dg/tree-ssa/pr21463.C: Likewise.
> > 	* g++.dg/tree-ssa/pr30738.C: Likewise.
> 
> OK.  Thanks for you patience.

I added another testcase and applied the patch to mainline after a
re-bootstrap and test on x86_64-unknown-linux-gnu.

Thanks,
Richard.