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re PR rtl-optimization/49936 (IRA handles CANNOT_CHANGE_MODE_CLASS poorly, + spills to memory on 4.7)

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2011-08-19  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/49936
	* ira.c (ira_init_register_move_cost): Ignore too small subclasses
	for calculation of max register move costs.

From-SVN: r177916
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Vladimir Makarov 2011-08-19 22:17:26 +00:00 committed by Vladimir Makarov
parent 02ee3d3153
commit 3bb19a90c8
2 changed files with 10 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-08-19 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/49936
* ira.c (ira_init_register_move_cost): Ignore too small subclasses
for calculation of max register move costs.
2011-08-19 Joseph Myers <joseph@codesourcery.com>
* c-parser.c (c_parser_postfix_expression): Convert operands of

4
gcc/ira.c
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@ -1501,6 +1501,10 @@ ira_init_register_move_cost (enum machine_mode mode)
sizeof (move_table) * N_REG_CLASSES);
for (cl1 = 0; cl1 < N_REG_CLASSES; cl1++)
{
/* Some subclasses are to small to have enough registers to hold
a value of MODE. Just ignore them. */
if (! contains_reg_of_mode[cl1][mode])
continue;
COPY_HARD_REG_SET (temp_hard_regset, reg_class_contents[cl1]);
AND_COMPL_HARD_REG_SET (temp_hard_regset, no_unit_alloc_regs);
if (hard_reg_set_empty_p (temp_hard_regset))