This fixes a failure in the testsuite. When we transform the doloop
pattern, the decrement of the old iteration register goes away, which is
a problem if it's used after the loop (where it should have the value zero).
Committed.
Bernd
* config/c6x/c6x.c (predicate_insn): Avoid rtl sharing failure.
(hwloop_optimize): Handle case where the old iteration reg is used
after the loop.
Index: gcc/config/c6x/c6x.c
===================================================================
--- gcc/config/c6x/c6x.c (revision 245685)
+++ gcc/config/c6x/c6x.c (working copy)
@@ -5788,8 +5789,9 @@ hwloop_optimize (hwloop_info loop)
start_sequence ();
insn = emit_insn (gen_mvilc (loop->iter_reg));
+ if (loop->iter_reg_used_outside)
+ insn = emit_move_insn (loop->iter_reg, const0_rtx);
insn = emit_insn (gen_sploop (GEN_INT (sp_ii)));
-
seq = get_insns ();
if (!single_succ_p (entry_bb) || vec_safe_length (loop->incoming) > 1)
