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bfin.c (bfin_register_move_cost): Test for subsets of DREGS rather than comparing directly.

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* config/bfin/bfin.c (bfin_register_move_cost): Test for subsets of
	DREGS rather than comparing directly.  Remove code that tries to
	account for latencies.

From-SVN: r146956
This commit is contained in:
Bernd Schmidt 2009-04-29 12:44:00 +00:00 committed by Bernd Schmidt
parent bd0a4cabe3
commit c5d9672394
2 changed files with 6 additions and 8 deletions
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4
gcc/ChangeLog
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@ -5,6 +5,10 @@
Remove special case testing for last insn of inner loops. Don't fail if
the loop ends with a jump, emit an extra nop instead.
* config/bfin/bfin.c (bfin_register_move_cost): Test for subsets of
DREGS rather than comparing directly. Remove code that tries to
account for latencies.
2009-04-29 Richard Guenther <rguenther@suse.de>
PR tree-optimization/39941

10
gcc/config/bfin/bfin.c
View File

@ -2331,20 +2331,14 @@ bfin_register_move_cost (enum machine_mode mode,
enum reg_class class1, enum reg_class class2)
{
/* These need secondary reloads, so they're more expensive. */
if ((class1 == CCREGS && class2 != DREGS)
|| (class1 != DREGS && class2 == CCREGS))
if ((class1 == CCREGS && !reg_class_subset_p (class2, DREGS))
|| (class2 == CCREGS && !reg_class_subset_p (class1, DREGS)))
return 4;
/* If optimizing for size, always prefer reg-reg over reg-memory moves. */
if (optimize_size)
return 2;
/* There are some stalls involved when moving from a DREG to a different
class reg, and using the value in one of the following instructions.
Attempt to model this by slightly discouraging such moves. */
if (class1 == DREGS && class2 != DREGS)
return 2 * 2;
if (GET_MODE_CLASS (mode) == MODE_INT)
{
/* Discourage trying to use the accumulators. */