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| author | Vladimir Makarov <vmakarov@redhat.com> | 2011-08-19 22:17:26 +0000 |
|---|---|---|
| committer | Vladimir Makarov <vmakarov@gcc.gnu.org> | 2011-08-19 22:17:26 +0000 |
| commit | 3bb19a90c8d642f6659a20cc6d2e51d3de25b0a4 (patch) | |
| tree | 58608fae12ae7e877ca12b2fd9744af635d10486 /gcc | |
| parent | 02ee3d31539a74740040921e34e38035fbd8ac72 (diff) | |
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re PR rtl-optimization/49936 (IRA handles CANNOT_CHANGE_MODE_CLASS poorly, + spills to memory on 4.7)
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
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/ira.c | 4 |
2 files changed, 10 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6457234..c474058 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 @@ -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)) |