[PATCH] Fix PR optimization/10157

[Eric Botcazou]

Hi,

This is a regression from the 3.3 branch, present on mainline on Sparc.

The improved loop invariant hoisting machinery
	http://gcc.gnu.org/ml/gcc-patches/2003-02/msg02300.html
produces invalid CCmode moves on Sparc, which doesn't feature the "movcc" 
pattern.

The proposed fix is to use the same precaution as GCSE before trying to apply 
the new transformation. Bootstrapped/regtested on sparc-sun-solaris2.9 
(c,c++,objc,f77 mainline).

-- 
Eric Botcazou


2003-04-02  Eric Botcazou  <ebotcazou@libertysurf.fr>

	PR optimization/10157
	* gcse.c (can_copy_p): Change it to bool. Export.
	(can_copy_init_p): Likewise.
	(compute_can_copy): Export.
	(gcse_main): Set can_copy_init_p to true instead of 1.
	(bypass_jumps): Likewise.
	* rtl.h (can_copy_p): Declare.
	(can_copy_init_p): Likewise.
	(compute_can_copy): Likewise.
	* loop.c (scan_loop): Initialize can_copy_p if necessary.
	Don't move the source and add a reg-to-reg copy if the
	mode doesn't support copy operations.


2003-04-02  Eric Botcazou  <ebotcazou@libertysurf.fr>

	* gcc.dg/sparc-loop-1.c: New test.
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