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re PR rtl-optimization/31848 (Invalid loop optimization causes bootstrap failure in genautomata) 

PR rtl-optimization/31848
	* loop-invariant.c (move_invariant_reg): If we move an insn
	with a REG_EQUAL note, and that insn is not always executed,
	remove the REG_EQUAL note.

From-SVN: r124639
This commit is contained in:
Steven Bosscher 2007-05-12 18:12:54 +00:00
parent 8c0dbf3490
commit 7f6055d052
2 changed files with 19 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2007-05-12 Steven Bosscher <steven@gcc.gnu.org>
PR rtl-optimization/31848
* loop-invariant.c (move_invariant_reg): If we move an insn
with a REG_EQUAL note, and that insn is not always executed,
remove the REG_EQUAL note.
2007-05-12 Richard Guenther <rguenther@suse.de>
PR tree-optimization/31797

12
gcc/loop-invariant.c
View File

@ -1156,9 +1156,21 @@ move_invariant_reg (struct loop *loop, unsigned invno)
to let emit_move_insn produce a valid instruction stream. */
if (REG_P (dest) && !HARD_REGISTER_P (dest))
{
rtx note;
emit_insn_after (gen_move_insn (dest, reg), inv->insn);
SET_DEST (set) = reg;
reorder_insns (inv->insn, inv->insn, BB_END (preheader));
/* If there is a REG_EQUAL note on the insn we just moved, and
insn is in a basic block that is not always executed, the note
may no longer be valid after we move the insn.
Note that uses in REG_EQUAL notes are taken into account in
the computation of invariants. Hence it is safe to retain the
note even if the note contains register references. */
if (! inv->always_executed
&& (note = find_reg_note (inv->insn, REG_EQUAL, NULL_RTX)))
remove_note (inv->insn, note);
}
else
{