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expr.c (expand_expr_real_2): Re-cost if previous costs are the same.

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2017-04-26  Tamar Christina  <tamar.christina@arm.com>

	* expr.c (expand_expr_real_2): Re-cost if previous costs are the same.

From-SVN: r247505
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Tamar Christina 2017-05-02 15:20:47 +00:00 • committed by Tamar Christina
parent cc5b8f3d56
commit 22677ff0c4
2 changed files with 13 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,7 @@
2017-04-26 Tamar Christina <tamar.christina@arm.com>
* expr.c (expand_expr_real_2): Re-cost if previous costs are the same.
2017-04-27 Tamar Christina <tamar.christina@arm.com>
* simplify-rtx.c (simplify_binary_operation_1): Add LSHIFTRT case.

9
gcc/expr.c
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@ -8838,6 +8838,15 @@ expand_expr_real_2 (sepops ops, rtx target, machine_mode tmode,
end_sequence ();
unsigned uns_cost = seq_cost (uns_insns, speed_p);
unsigned sgn_cost = seq_cost (sgn_insns, speed_p);
/* If costs are the same then use as tie breaker the other
other factor. */
if (uns_cost == sgn_cost)
{
uns_cost = seq_cost (uns_insns, !speed_p);
sgn_cost = seq_cost (sgn_insns, !speed_p);
}
if (uns_cost < sgn_cost || (uns_cost == sgn_cost && unsignedp))
{
emit_insn (uns_insns);